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-INT.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_false-unreach-call3_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 15:31:54,312 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 15:31:54,316 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 15:31:54,336 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 15:31:54,337 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 15:31:54,338 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 15:31:54,339 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 15:31:54,341 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 15:31:54,348 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 15:31:54,349 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 15:31:54,350 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 15:31:54,351 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 15:31:54,352 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 15:31:54,353 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 15:31:54,354 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 15:31:54,355 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 15:31:54,355 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 15:31:54,357 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 15:31:54,359 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 15:31:54,363 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 15:31:54,364 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 15:31:54,369 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 15:31:54,375 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 15:31:54,375 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 15:31:54,375 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 15:31:54,376 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 15:31:54,378 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 15:31:54,379 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 15:31:54,380 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 15:31:54,385 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 15:31:54,385 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 15:31:54,386 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-27 15:31:54,390 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf [2018-10-27 15:31:54,418 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 15:31:54,418 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 15:31:54,420 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 15:31:54,420 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 15:31:54,420 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 15:31:54,420 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 15:31:54,421 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 15:31:54,421 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 15:31:54,421 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 15:31:54,421 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 15:31:54,421 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 15:31:54,422 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 15:31:54,423 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 15:31:54,423 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 15:31:54,423 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 15:31:54,423 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 15:31:54,424 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 15:31:54,424 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 15:31:54,424 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 15:31:54,424 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 15:31:54,424 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 15:31:54,425 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 15:31:54,425 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 15:31:54,425 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 15:31:54,425 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 15:31:54,425 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 15:31:54,425 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 15:31:54,426 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 15:31:54,426 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 15:31:54,426 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 15:31:54,426 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 15:31:54,426 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 15:31:54,427 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 15:31:54,427 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 15:31:54,475 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 15:31:54,489 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 15:31:54,493 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 15:31:54,495 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 15:31:54,495 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 15:31:54,496 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/array_false-unreach-call3_true-termination.i [2018-10-27 15:31:54,566 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/9b70535b8/c98400f958ed4310956731b777f55b53/FLAGd214a19ec [2018-10-27 15:31:55,008 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 15:31:55,009 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_false-unreach-call3_true-termination.i [2018-10-27 15:31:55,016 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/9b70535b8/c98400f958ed4310956731b777f55b53/FLAGd214a19ec [2018-10-27 15:31:55,036 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/9b70535b8/c98400f958ed4310956731b777f55b53 [2018-10-27 15:31:55,050 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 15:31:55,052 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 15:31:55,052 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 15:31:55,053 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 15:31:55,056 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 15:31:55,057 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 03:31:55" (1/1) ... [2018-10-27 15:31:55,059 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@680dbf83 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:55, skipping insertion in model container [2018-10-27 15:31:55,059 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 03:31:55" (1/1) ... [2018-10-27 15:31:55,070 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 15:31:55,098 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 15:31:55,327 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 15:31:55,330 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 15:31:55,350 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 15:31:55,376 INFO L193 MainTranslator]: Completed translation [2018-10-27 15:31:55,376 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:55 WrapperNode [2018-10-27 15:31:55,377 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 15:31:55,377 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 15:31:55,378 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 15:31:55,378 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 15:31:55,388 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:55" (1/1) ... [2018-10-27 15:31:55,401 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:55" (1/1) ... [2018-10-27 15:31:55,425 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 15:31:55,426 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 15:31:55,426 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 15:31:55,426 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 15:31:55,438 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:55" (1/1) ... [2018-10-27 15:31:55,438 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:55" (1/1) ... [2018-10-27 15:31:55,441 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:55" (1/1) ... [2018-10-27 15:31:55,441 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:55" (1/1) ... [2018-10-27 15:31:55,446 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:55" (1/1) ... [2018-10-27 15:31:55,453 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:55" (1/1) ... [2018-10-27 15:31:55,458 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:55" (1/1) ... [2018-10-27 15:31:55,460 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 15:31:55,461 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 15:31:55,461 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 15:31:55,461 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 15:31:55,462 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:55" (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 15:31:55,595 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 15:31:55,595 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 15:31:55,596 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 15:31:55,596 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 15:31:55,596 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 15:31:55,596 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 15:31:55,596 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 15:31:55,596 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 15:31:55,948 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 15:31:55,949 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 03:31:55 BoogieIcfgContainer [2018-10-27 15:31:55,949 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 15:31:55,950 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 15:31:55,950 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 15:31:55,954 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 15:31:55,954 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 03:31:55" (1/3) ... [2018-10-27 15:31:55,955 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2588aa1f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 03:31:55, skipping insertion in model container [2018-10-27 15:31:55,955 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:31:55" (2/3) ... [2018-10-27 15:31:55,956 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2588aa1f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 03:31:55, skipping insertion in model container [2018-10-27 15:31:55,956 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 03:31:55" (3/3) ... [2018-10-27 15:31:55,958 INFO L112 eAbstractionObserver]: Analyzing ICFG array_false-unreach-call3_true-termination.i [2018-10-27 15:31:55,969 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 15:31:55,978 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 15:31:55,996 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 15:31:56,030 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 15:31:56,030 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 15:31:56,030 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 15:31:56,030 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 15:31:56,031 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 15:31:56,031 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 15:31:56,031 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 15:31:56,031 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 15:31:56,049 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2018-10-27 15:31:56,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-27 15:31:56,056 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:31:56,057 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:31:56,059 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:31:56,065 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:31:56,066 INFO L82 PathProgramCache]: Analyzing trace with hash 1097964223, now seen corresponding path program 1 times [2018-10-27 15:31:56,070 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:31:56,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:56,123 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:31:56,124 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:56,124 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:31:56,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:31:56,202 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 15:31:56,204 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 15:31:56,205 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 15:31:56,205 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:31:56,211 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 15:31:56,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 15:31:56,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 15:31:56,230 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2018-10-27 15:31:56,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:31:56,255 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2018-10-27 15:31:56,255 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 15:31:56,257 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-10-27 15:31:56,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:31:56,268 INFO L225 Difference]: With dead ends: 41 [2018-10-27 15:31:56,268 INFO L226 Difference]: Without dead ends: 18 [2018-10-27 15:31:56,272 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 15:31:56,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-27 15:31:56,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-27 15:31:56,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-27 15:31:56,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-10-27 15:31:56,310 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-10-27 15:31:56,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:31:56,310 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-10-27 15:31:56,310 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 15:31:56,311 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-10-27 15:31:56,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-27 15:31:56,311 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:31:56,312 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:31:56,312 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:31:56,312 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:31:56,313 INFO L82 PathProgramCache]: Analyzing trace with hash 1413574900, now seen corresponding path program 1 times [2018-10-27 15:31:56,313 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:31:56,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:56,314 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:31:56,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:56,315 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:31:56,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:31:56,481 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 15:31:56,482 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 15:31:56,482 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 15:31:56,486 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:31:56,487 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 15:31:56,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 15:31:56,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 15:31:56,488 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 3 states. [2018-10-27 15:31:56,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:31:56,615 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-27 15:31:56,615 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 15:31:56,615 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2018-10-27 15:31:56,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:31:56,618 INFO L225 Difference]: With dead ends: 34 [2018-10-27 15:31:56,618 INFO L226 Difference]: Without dead ends: 25 [2018-10-27 15:31:56,619 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 15:31:56,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-27 15:31:56,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 20. [2018-10-27 15:31:56,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-27 15:31:56,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2018-10-27 15:31:56,625 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2018-10-27 15:31:56,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:31:56,626 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2018-10-27 15:31:56,626 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 15:31:56,626 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2018-10-27 15:31:56,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-27 15:31:56,627 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:31:56,627 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:31:56,627 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:31:56,627 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:31:56,628 INFO L82 PathProgramCache]: Analyzing trace with hash -1818930225, now seen corresponding path program 1 times [2018-10-27 15:31:56,628 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:31:56,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:56,629 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:31:56,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:56,629 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:31:56,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:31:56,728 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 15:31:56,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:31:56,731 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:31:56,732 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-10-27 15:31:56,734 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [38], [41], [43], [49], [50], [51], [53] [2018-10-27 15:31:56,771 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-10-27 15:31:56,772 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 15:31:57,114 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 15:31:57,115 INFO L272 AbstractInterpreter]: Visited 17 different actions 41 times. Merged at 3 different actions 18 times. Widened at 1 different actions 2 times. Found 1 fixpoints after 1 different actions. Largest state had 30 variables. [2018-10-27 15:31:57,129 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:31:57,131 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 15:31:57,131 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:31:57,132 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 15:31:57,145 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:31:57,146 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:31:57,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:31:57,205 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:31:57,279 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 15:31:57,280 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:31:57,394 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 15:31:57,425 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:31:57,425 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2018-10-27 15:31:57,425 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:31:57,426 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 15:31:57,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 15:31:57,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-27 15:31:57,427 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 5 states. [2018-10-27 15:31:57,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:31:57,665 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2018-10-27 15:31:57,666 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 15:31:57,666 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2018-10-27 15:31:57,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:31:57,667 INFO L225 Difference]: With dead ends: 41 [2018-10-27 15:31:57,667 INFO L226 Difference]: Without dead ends: 32 [2018-10-27 15:31:57,668 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-27 15:31:57,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-27 15:31:57,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 23. [2018-10-27 15:31:57,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-27 15:31:57,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-10-27 15:31:57,674 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2018-10-27 15:31:57,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:31:57,674 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-10-27 15:31:57,674 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 15:31:57,675 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-10-27 15:31:57,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-27 15:31:57,675 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:31:57,676 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:31:57,676 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:31:57,676 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:31:57,676 INFO L82 PathProgramCache]: Analyzing trace with hash 377601812, now seen corresponding path program 2 times [2018-10-27 15:31:57,677 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:31:57,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:57,678 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:31:57,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:57,678 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:31:57,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:31:57,779 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 15:31:57,779 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:31:57,780 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:31:57,780 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:31:57,780 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:31:57,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:31:57,780 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 15:31:57,801 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:31:57,801 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:31:57,838 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2018-10-27 15:31:57,838 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:31:57,840 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:31:57,937 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-27 15:31:57,937 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:31:58,079 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-27 15:31:58,114 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-27 15:31:58,115 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5] total 11 [2018-10-27 15:31:58,115 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:31:58,115 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 15:31:58,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 15:31:58,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2018-10-27 15:31:58,117 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 5 states. [2018-10-27 15:31:58,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:31:58,278 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-10-27 15:31:58,279 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 15:31:58,279 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 21 [2018-10-27 15:31:58,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:31:58,280 INFO L225 Difference]: With dead ends: 31 [2018-10-27 15:31:58,280 INFO L226 Difference]: Without dead ends: 26 [2018-10-27 15:31:58,281 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2018-10-27 15:31:58,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-27 15:31:58,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2018-10-27 15:31:58,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-27 15:31:58,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2018-10-27 15:31:58,286 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 21 [2018-10-27 15:31:58,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:31:58,287 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2018-10-27 15:31:58,287 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 15:31:58,287 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2018-10-27 15:31:58,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-27 15:31:58,288 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:31:58,288 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:31:58,289 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:31:58,289 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:31:58,289 INFO L82 PathProgramCache]: Analyzing trace with hash 1343240274, now seen corresponding path program 1 times [2018-10-27 15:31:58,289 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:31:58,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:58,291 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:31:58,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:58,291 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:31:58,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:31:58,378 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 15:31:58,378 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:31:58,378 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:31:58,379 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-10-27 15:31:58,379 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [29], [31], [38], [41], [43], [49], [50], [51], [53] [2018-10-27 15:31:58,381 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-10-27 15:31:58,381 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 15:31:58,630 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 15:31:58,631 INFO L272 AbstractInterpreter]: Visited 19 different actions 91 times. Merged at 7 different actions 42 times. Widened at 2 different actions 4 times. Found 2 fixpoints after 2 different actions. Largest state had 31 variables. [2018-10-27 15:31:58,646 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:31:58,646 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 15:31:58,646 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:31:58,646 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 15:31:58,655 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:31:58,656 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:31:58,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:31:58,694 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:31:58,722 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 15:31:58,722 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:31:58,788 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 15:31:58,814 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:31:58,814 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-10-27 15:31:58,814 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:31:58,815 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 15:31:58,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 15:31:58,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-27 15:31:58,817 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 6 states. [2018-10-27 15:31:59,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:31:59,204 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2018-10-27 15:31:59,205 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 15:31:59,205 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 24 [2018-10-27 15:31:59,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:31:59,206 INFO L225 Difference]: With dead ends: 49 [2018-10-27 15:31:59,206 INFO L226 Difference]: Without dead ends: 38 [2018-10-27 15:31:59,207 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-27 15:31:59,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-27 15:31:59,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28. [2018-10-27 15:31:59,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-27 15:31:59,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2018-10-27 15:31:59,213 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 24 [2018-10-27 15:31:59,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:31:59,214 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2018-10-27 15:31:59,214 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 15:31:59,214 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2018-10-27 15:31:59,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-27 15:31:59,215 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:31:59,215 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:31:59,215 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:31:59,216 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:31:59,216 INFO L82 PathProgramCache]: Analyzing trace with hash 1859017687, now seen corresponding path program 2 times [2018-10-27 15:31:59,216 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:31:59,217 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:59,217 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:31:59,217 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:59,218 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:31:59,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:31:59,362 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 15:31:59,363 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:31:59,363 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:31:59,363 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:31:59,364 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:31:59,364 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:31:59,364 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 15:31:59,378 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:31:59,378 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:31:59,405 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-27 15:31:59,405 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:31:59,408 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:31:59,447 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 15:31:59,447 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:31:59,602 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 15:31:59,632 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:31:59,633 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 13 [2018-10-27 15:31:59,633 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:31:59,633 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 15:31:59,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 15:31:59,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2018-10-27 15:31:59,634 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 9 states. [2018-10-27 15:31:59,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:31:59,815 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2018-10-27 15:31:59,815 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 15:31:59,815 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2018-10-27 15:31:59,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:31:59,816 INFO L225 Difference]: With dead ends: 58 [2018-10-27 15:31:59,816 INFO L226 Difference]: Without dead ends: 42 [2018-10-27 15:31:59,817 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2018-10-27 15:31:59,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-27 15:31:59,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2018-10-27 15:31:59,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-27 15:31:59,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2018-10-27 15:31:59,824 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 27 [2018-10-27 15:31:59,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:31:59,825 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2018-10-27 15:31:59,825 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 15:31:59,825 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2018-10-27 15:31:59,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-27 15:31:59,826 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:31:59,826 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:31:59,827 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:31:59,827 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:31:59,827 INFO L82 PathProgramCache]: Analyzing trace with hash 192508852, now seen corresponding path program 3 times [2018-10-27 15:31:59,827 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:31:59,828 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:59,828 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:31:59,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:31:59,829 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:31:59,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:31:59,966 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 15:31:59,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:31:59,966 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:31:59,966 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:31:59,967 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:31:59,967 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:31:59,967 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 15:31:59,977 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:31:59,978 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:32:00,035 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:32:00,035 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:00,039 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:00,145 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 15:32:00,145 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:00,325 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 15:32:00,347 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:00,347 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-10-27 15:32:00,347 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:00,348 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 15:32:00,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 15:32:00,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-27 15:32:00,349 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 8 states. [2018-10-27 15:32:00,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:00,477 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2018-10-27 15:32:00,478 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 15:32:00,478 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 39 [2018-10-27 15:32:00,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:00,480 INFO L225 Difference]: With dead ends: 69 [2018-10-27 15:32:00,480 INFO L226 Difference]: Without dead ends: 49 [2018-10-27 15:32:00,481 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-27 15:32:00,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-27 15:32:00,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 43. [2018-10-27 15:32:00,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-27 15:32:00,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2018-10-27 15:32:00,487 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 39 [2018-10-27 15:32:00,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:00,488 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2018-10-27 15:32:00,488 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 15:32:00,488 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2018-10-27 15:32:00,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-10-27 15:32:00,489 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:00,489 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:00,490 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:00,490 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:00,490 INFO L82 PathProgramCache]: Analyzing trace with hash -82233969, now seen corresponding path program 4 times [2018-10-27 15:32:00,490 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:00,491 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:00,491 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:00,491 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:00,491 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:00,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:01,022 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 15:32:01,023 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:01,023 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:01,023 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:01,023 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:01,023 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:01,023 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 15:32:01,032 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:01,033 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:32:01,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:01,079 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:01,102 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 15:32:01,103 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:01,282 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 15:32:01,303 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:01,304 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-10-27 15:32:01,304 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:01,304 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 15:32:01,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 15:32:01,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-27 15:32:01,305 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 9 states. [2018-10-27 15:32:01,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:01,565 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2018-10-27 15:32:01,566 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 15:32:01,566 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 42 [2018-10-27 15:32:01,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:01,568 INFO L225 Difference]: With dead ends: 76 [2018-10-27 15:32:01,568 INFO L226 Difference]: Without dead ends: 56 [2018-10-27 15:32:01,569 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-27 15:32:01,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-10-27 15:32:01,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 46. [2018-10-27 15:32:01,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-27 15:32:01,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2018-10-27 15:32:01,575 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 42 [2018-10-27 15:32:01,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:01,576 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2018-10-27 15:32:01,576 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 15:32:01,576 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2018-10-27 15:32:01,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-27 15:32:01,577 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:01,578 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:01,578 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:01,578 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:01,578 INFO L82 PathProgramCache]: Analyzing trace with hash 1262051796, now seen corresponding path program 5 times [2018-10-27 15:32:01,579 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:01,579 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:01,580 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:01,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:01,580 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:01,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:01,737 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 15:32:01,737 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:01,737 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:01,737 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:01,737 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:01,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:01,738 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 15:32:01,747 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:32:01,747 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:32:01,804 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-27 15:32:01,804 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:01,808 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:01,868 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-27 15:32:01,868 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:02,026 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-27 15:32:02,048 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:02,048 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 19 [2018-10-27 15:32:02,049 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:02,049 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 15:32:02,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 15:32:02,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=227, Unknown=0, NotChecked=0, Total=342 [2018-10-27 15:32:02,050 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 12 states. [2018-10-27 15:32:02,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:02,176 INFO L93 Difference]: Finished difference Result 85 states and 90 transitions. [2018-10-27 15:32:02,177 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 15:32:02,177 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 45 [2018-10-27 15:32:02,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:02,178 INFO L225 Difference]: With dead ends: 85 [2018-10-27 15:32:02,178 INFO L226 Difference]: Without dead ends: 60 [2018-10-27 15:32:02,180 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=121, Invalid=259, Unknown=0, NotChecked=0, Total=380 [2018-10-27 15:32:02,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-27 15:32:02,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2018-10-27 15:32:02,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-27 15:32:02,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2018-10-27 15:32:02,187 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 45 [2018-10-27 15:32:02,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:02,187 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2018-10-27 15:32:02,187 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 15:32:02,188 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2018-10-27 15:32:02,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-27 15:32:02,189 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:02,190 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:02,190 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:02,190 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:02,190 INFO L82 PathProgramCache]: Analyzing trace with hash -65813737, now seen corresponding path program 6 times [2018-10-27 15:32:02,190 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:02,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:02,191 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:02,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:02,192 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:02,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:02,382 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 15:32:02,383 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:02,383 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:02,383 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:02,383 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:02,383 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:02,384 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 15:32:02,394 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:32:02,394 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:32:02,445 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:32:02,446 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:02,450 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:02,472 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 15:32:02,473 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:02,638 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 15:32:02,660 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:02,661 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-10-27 15:32:02,661 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:02,661 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 15:32:02,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 15:32:02,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-27 15:32:02,662 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand 11 states. [2018-10-27 15:32:02,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:02,834 INFO L93 Difference]: Finished difference Result 96 states and 99 transitions. [2018-10-27 15:32:02,834 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 15:32:02,834 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 57 [2018-10-27 15:32:02,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:02,835 INFO L225 Difference]: With dead ends: 96 [2018-10-27 15:32:02,835 INFO L226 Difference]: Without dead ends: 67 [2018-10-27 15:32:02,836 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-27 15:32:02,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-27 15:32:02,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 61. [2018-10-27 15:32:02,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-10-27 15:32:02,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2018-10-27 15:32:02,842 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 57 [2018-10-27 15:32:02,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:02,843 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2018-10-27 15:32:02,843 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 15:32:02,843 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2018-10-27 15:32:02,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-10-27 15:32:02,844 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:02,845 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:02,845 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:02,845 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:02,845 INFO L82 PathProgramCache]: Analyzing trace with hash 1181148210, now seen corresponding path program 7 times [2018-10-27 15:32:02,846 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:02,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:02,847 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:02,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:02,847 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:02,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:02,994 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 15:32:02,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:02,995 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:02,995 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:02,995 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:02,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:02,996 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 15:32:03,007 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:03,007 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:32:03,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:03,072 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:03,149 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 15:32:03,149 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:03,428 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 15:32:03,450 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:03,450 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-10-27 15:32:03,450 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:03,451 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 15:32:03,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 15:32:03,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-27 15:32:03,452 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand 12 states. [2018-10-27 15:32:03,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:03,605 INFO L93 Difference]: Finished difference Result 103 states and 107 transitions. [2018-10-27 15:32:03,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 15:32:03,605 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 60 [2018-10-27 15:32:03,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:03,607 INFO L225 Difference]: With dead ends: 103 [2018-10-27 15:32:03,607 INFO L226 Difference]: Without dead ends: 74 [2018-10-27 15:32:03,608 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-27 15:32:03,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-27 15:32:03,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 64. [2018-10-27 15:32:03,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-10-27 15:32:03,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2018-10-27 15:32:03,615 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 60 [2018-10-27 15:32:03,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:03,616 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2018-10-27 15:32:03,616 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 15:32:03,616 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2018-10-27 15:32:03,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-10-27 15:32:03,617 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:03,617 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:03,617 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:03,618 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:03,618 INFO L82 PathProgramCache]: Analyzing trace with hash -2042599113, now seen corresponding path program 8 times [2018-10-27 15:32:03,618 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:03,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:03,619 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:03,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:03,619 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:03,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:04,077 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 15:32:04,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:04,078 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:04,078 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:04,078 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:04,078 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:04,078 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 15:32:04,086 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:32:04,086 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:32:04,171 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-27 15:32:04,171 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:04,175 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:04,391 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-27 15:32:04,391 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:04,548 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-27 15:32:04,570 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:04,570 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 25 [2018-10-27 15:32:04,570 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:04,571 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 15:32:04,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 15:32:04,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=380, Unknown=0, NotChecked=0, Total=600 [2018-10-27 15:32:04,572 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand 15 states. [2018-10-27 15:32:04,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:04,760 INFO L93 Difference]: Finished difference Result 112 states and 117 transitions. [2018-10-27 15:32:04,760 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 15:32:04,760 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 63 [2018-10-27 15:32:04,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:04,762 INFO L225 Difference]: With dead ends: 112 [2018-10-27 15:32:04,762 INFO L226 Difference]: Without dead ends: 78 [2018-10-27 15:32:04,763 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=226, Invalid=424, Unknown=0, NotChecked=0, Total=650 [2018-10-27 15:32:04,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-27 15:32:04,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2018-10-27 15:32:04,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-10-27 15:32:04,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2018-10-27 15:32:04,771 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 63 [2018-10-27 15:32:04,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:04,771 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2018-10-27 15:32:04,771 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 15:32:04,771 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2018-10-27 15:32:04,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-10-27 15:32:04,776 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:04,776 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:04,776 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:04,776 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:04,776 INFO L82 PathProgramCache]: Analyzing trace with hash -1037724716, now seen corresponding path program 9 times [2018-10-27 15:32:04,776 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:04,777 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:04,777 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:04,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:04,778 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:04,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:04,999 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 15:32:05,000 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:05,000 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:05,000 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:05,000 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:05,000 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:05,000 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 15:32:05,008 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:32:05,008 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:32:05,081 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:32:05,081 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:05,086 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:05,204 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 15:32:05,204 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:05,664 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 15:32:05,686 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:05,687 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-10-27 15:32:05,687 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:05,687 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 15:32:05,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 15:32:05,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-27 15:32:05,688 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand 14 states. [2018-10-27 15:32:05,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:05,861 INFO L93 Difference]: Finished difference Result 123 states and 126 transitions. [2018-10-27 15:32:05,862 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 15:32:05,862 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 75 [2018-10-27 15:32:05,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:05,863 INFO L225 Difference]: With dead ends: 123 [2018-10-27 15:32:05,863 INFO L226 Difference]: Without dead ends: 85 [2018-10-27 15:32:05,866 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-27 15:32:05,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-27 15:32:05,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 79. [2018-10-27 15:32:05,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-27 15:32:05,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-10-27 15:32:05,879 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 75 [2018-10-27 15:32:05,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:05,879 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-10-27 15:32:05,879 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 15:32:05,879 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-10-27 15:32:05,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-10-27 15:32:05,885 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:05,885 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:05,885 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:05,886 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:05,886 INFO L82 PathProgramCache]: Analyzing trace with hash -448084945, now seen corresponding path program 10 times [2018-10-27 15:32:05,886 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:05,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:05,890 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:05,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:05,890 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:05,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:06,184 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 15:32:06,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:06,184 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:06,184 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:06,184 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:06,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:06,184 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 15:32:06,192 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:06,193 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:32:06,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:06,258 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:06,293 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 15:32:06,294 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:06,656 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 15:32:06,677 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:06,678 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-10-27 15:32:06,678 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:06,678 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 15:32:06,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 15:32:06,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-27 15:32:06,679 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 15 states. [2018-10-27 15:32:06,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:06,837 INFO L93 Difference]: Finished difference Result 130 states and 134 transitions. [2018-10-27 15:32:06,838 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 15:32:06,838 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 78 [2018-10-27 15:32:06,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:06,839 INFO L225 Difference]: With dead ends: 130 [2018-10-27 15:32:06,839 INFO L226 Difference]: Without dead ends: 92 [2018-10-27 15:32:06,840 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-27 15:32:06,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-10-27 15:32:06,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 82. [2018-10-27 15:32:06,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-10-27 15:32:06,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2018-10-27 15:32:06,847 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 78 [2018-10-27 15:32:06,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:06,848 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2018-10-27 15:32:06,848 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 15:32:06,848 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2018-10-27 15:32:06,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-10-27 15:32:06,849 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:06,849 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:06,850 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:06,850 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:06,850 INFO L82 PathProgramCache]: Analyzing trace with hash -905907724, now seen corresponding path program 11 times [2018-10-27 15:32:06,850 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:06,851 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:06,851 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:06,851 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:06,851 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:06,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:07,064 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 15:32:07,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:07,064 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:07,065 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:07,065 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:07,065 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:07,065 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 15:32:07,074 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:32:07,074 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:32:07,199 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-27 15:32:07,199 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:07,204 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:07,414 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-27 15:32:07,414 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:07,708 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-27 15:32:07,729 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:07,730 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 31 [2018-10-27 15:32:07,730 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:07,730 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 15:32:07,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 15:32:07,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=569, Unknown=0, NotChecked=0, Total=930 [2018-10-27 15:32:07,731 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand 18 states. [2018-10-27 15:32:07,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:07,905 INFO L93 Difference]: Finished difference Result 139 states and 144 transitions. [2018-10-27 15:32:07,905 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 15:32:07,906 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 81 [2018-10-27 15:32:07,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:07,907 INFO L225 Difference]: With dead ends: 139 [2018-10-27 15:32:07,907 INFO L226 Difference]: Without dead ends: 96 [2018-10-27 15:32:07,908 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=367, Invalid=625, Unknown=0, NotChecked=0, Total=992 [2018-10-27 15:32:07,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-27 15:32:07,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 94. [2018-10-27 15:32:07,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-10-27 15:32:07,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2018-10-27 15:32:07,914 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 81 [2018-10-27 15:32:07,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:07,915 INFO L481 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2018-10-27 15:32:07,915 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 15:32:07,915 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2018-10-27 15:32:07,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-10-27 15:32:07,916 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:07,916 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:07,917 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:07,917 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:07,917 INFO L82 PathProgramCache]: Analyzing trace with hash 773593207, now seen corresponding path program 12 times [2018-10-27 15:32:07,917 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:07,918 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:07,918 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:07,918 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:07,918 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:07,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:08,803 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 15:32:08,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:08,804 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:08,804 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:08,804 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:08,804 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:08,804 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 15:32:08,815 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:32:08,816 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:32:08,890 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:32:08,890 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:08,894 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:08,916 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 15:32:08,917 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:09,249 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 15:32:09,271 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:09,271 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-10-27 15:32:09,271 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:09,272 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 15:32:09,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 15:32:09,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-27 15:32:09,273 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand 17 states. [2018-10-27 15:32:09,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:09,446 INFO L93 Difference]: Finished difference Result 150 states and 153 transitions. [2018-10-27 15:32:09,446 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 15:32:09,447 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 93 [2018-10-27 15:32:09,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:09,448 INFO L225 Difference]: With dead ends: 150 [2018-10-27 15:32:09,448 INFO L226 Difference]: Without dead ends: 103 [2018-10-27 15:32:09,450 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-27 15:32:09,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-27 15:32:09,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 97. [2018-10-27 15:32:09,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-10-27 15:32:09,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-10-27 15:32:09,455 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 93 [2018-10-27 15:32:09,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:09,456 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-10-27 15:32:09,456 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 15:32:09,456 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-10-27 15:32:09,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-27 15:32:09,457 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:09,458 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:09,458 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:09,458 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:09,458 INFO L82 PathProgramCache]: Analyzing trace with hash -1075443694, now seen corresponding path program 13 times [2018-10-27 15:32:09,459 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:09,459 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:09,459 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:09,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:09,460 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:09,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:09,789 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 15:32:09,790 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:09,790 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:09,790 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:09,790 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:09,790 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:09,790 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 15:32:09,798 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:09,798 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:32:09,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:09,886 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:09,919 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 15:32:09,934 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:10,308 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 15:32:10,329 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:10,329 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-10-27 15:32:10,329 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:10,330 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 15:32:10,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 15:32:10,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 15:32:10,331 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 18 states. [2018-10-27 15:32:10,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:10,625 INFO L93 Difference]: Finished difference Result 157 states and 161 transitions. [2018-10-27 15:32:10,625 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 15:32:10,625 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 96 [2018-10-27 15:32:10,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:10,627 INFO L225 Difference]: With dead ends: 157 [2018-10-27 15:32:10,627 INFO L226 Difference]: Without dead ends: 110 [2018-10-27 15:32:10,628 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 177 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 15:32:10,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2018-10-27 15:32:10,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 100. [2018-10-27 15:32:10,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-10-27 15:32:10,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2018-10-27 15:32:10,633 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 96 [2018-10-27 15:32:10,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:10,633 INFO L481 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2018-10-27 15:32:10,633 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 15:32:10,633 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2018-10-27 15:32:10,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-27 15:32:10,635 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:10,635 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:10,635 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:10,635 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:10,635 INFO L82 PathProgramCache]: Analyzing trace with hash 1516777111, now seen corresponding path program 14 times [2018-10-27 15:32:10,636 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:10,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:10,636 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:10,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:10,637 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:10,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:11,115 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 15:32:11,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:11,115 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:11,115 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:11,116 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:11,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:11,116 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 15:32:11,132 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:32:11,132 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:32:11,396 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-10-27 15:32:11,396 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:11,400 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:11,477 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-27 15:32:11,477 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:12,519 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-27 15:32:12,541 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:12,541 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 37 [2018-10-27 15:32:12,541 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:12,542 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 15:32:12,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 15:32:12,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=538, Invalid=794, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 15:32:12,543 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand 21 states. [2018-10-27 15:32:12,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:12,757 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2018-10-27 15:32:12,757 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 15:32:12,757 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 99 [2018-10-27 15:32:12,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:12,758 INFO L225 Difference]: With dead ends: 166 [2018-10-27 15:32:12,758 INFO L226 Difference]: Without dead ends: 114 [2018-10-27 15:32:12,760 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=544, Invalid=862, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 15:32:12,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-27 15:32:12,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2018-10-27 15:32:12,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-10-27 15:32:12,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2018-10-27 15:32:12,764 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 99 [2018-10-27 15:32:12,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:12,764 INFO L481 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2018-10-27 15:32:12,764 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 15:32:12,765 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2018-10-27 15:32:12,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-10-27 15:32:12,766 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:12,766 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:12,766 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:12,766 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:12,766 INFO L82 PathProgramCache]: Analyzing trace with hash 280509428, now seen corresponding path program 15 times [2018-10-27 15:32:12,767 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:12,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:12,767 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:12,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:12,768 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:12,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:13,062 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 15:32:13,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:13,063 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:13,063 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:13,063 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:13,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:13,063 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 15:32:13,071 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:32:13,072 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:32:13,153 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:32:13,153 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:13,157 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:13,189 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 15:32:13,190 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:14,501 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 15:32:14,523 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:14,523 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-10-27 15:32:14,523 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:14,524 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 15:32:14,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 15:32:14,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 15:32:14,525 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand 20 states. [2018-10-27 15:32:14,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:14,737 INFO L93 Difference]: Finished difference Result 177 states and 180 transitions. [2018-10-27 15:32:14,738 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 15:32:14,739 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 111 [2018-10-27 15:32:14,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:14,740 INFO L225 Difference]: With dead ends: 177 [2018-10-27 15:32:14,740 INFO L226 Difference]: Without dead ends: 121 [2018-10-27 15:32:14,741 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 15:32:14,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-10-27 15:32:14,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 115. [2018-10-27 15:32:14,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-27 15:32:14,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 116 transitions. [2018-10-27 15:32:14,745 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 116 transitions. Word has length 111 [2018-10-27 15:32:14,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:14,745 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 116 transitions. [2018-10-27 15:32:14,745 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 15:32:14,746 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 116 transitions. [2018-10-27 15:32:14,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-10-27 15:32:14,747 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:14,747 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:14,747 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:14,747 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:14,747 INFO L82 PathProgramCache]: Analyzing trace with hash -1179804977, now seen corresponding path program 16 times [2018-10-27 15:32:14,748 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:14,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:14,748 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:14,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:14,749 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:14,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:15,089 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 15:32:15,090 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:15,090 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:15,090 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:15,090 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:15,090 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:15,090 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 15:32:15,099 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:15,099 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:32:15,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:15,188 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:15,244 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 15:32:15,244 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:16,260 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 15:32:16,282 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:16,283 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-10-27 15:32:16,283 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:16,283 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 15:32:16,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 15:32:16,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 15:32:16,284 INFO L87 Difference]: Start difference. First operand 115 states and 116 transitions. Second operand 21 states. [2018-10-27 15:32:16,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:16,504 INFO L93 Difference]: Finished difference Result 184 states and 188 transitions. [2018-10-27 15:32:16,504 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 15:32:16,505 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 114 [2018-10-27 15:32:16,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:16,506 INFO L225 Difference]: With dead ends: 184 [2018-10-27 15:32:16,506 INFO L226 Difference]: Without dead ends: 128 [2018-10-27 15:32:16,508 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 15:32:16,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-10-27 15:32:16,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 118. [2018-10-27 15:32:16,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-10-27 15:32:16,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2018-10-27 15:32:16,513 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 114 [2018-10-27 15:32:16,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:16,513 INFO L481 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2018-10-27 15:32:16,513 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 15:32:16,513 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2018-10-27 15:32:16,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-10-27 15:32:16,514 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:16,514 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:16,515 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:16,515 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:16,515 INFO L82 PathProgramCache]: Analyzing trace with hash -1682503148, now seen corresponding path program 17 times [2018-10-27 15:32:16,515 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:16,516 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:16,516 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:16,516 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:16,517 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:16,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:17,016 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 15:32:17,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:17,017 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:17,017 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:17,017 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:17,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:17,018 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 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 15:32:17,027 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:32:17,027 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:32:17,308 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2018-10-27 15:32:17,308 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:17,313 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:17,370 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-10-27 15:32:17,370 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:17,847 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-10-27 15:32:17,869 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:17,869 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 43 [2018-10-27 15:32:17,869 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:17,869 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 15:32:17,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 15:32:17,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=751, Invalid=1055, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 15:32:17,871 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand 24 states. [2018-10-27 15:32:18,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:18,112 INFO L93 Difference]: Finished difference Result 193 states and 198 transitions. [2018-10-27 15:32:18,112 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 15:32:18,112 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 117 [2018-10-27 15:32:18,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:18,114 INFO L225 Difference]: With dead ends: 193 [2018-10-27 15:32:18,114 INFO L226 Difference]: Without dead ends: 132 [2018-10-27 15:32:18,116 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=757, Invalid=1135, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 15:32:18,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-10-27 15:32:18,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 130. [2018-10-27 15:32:18,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-10-27 15:32:18,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2018-10-27 15:32:18,120 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 117 [2018-10-27 15:32:18,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:18,120 INFO L481 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2018-10-27 15:32:18,120 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 15:32:18,121 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2018-10-27 15:32:18,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-27 15:32:18,121 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:18,122 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:18,122 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:18,122 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:18,122 INFO L82 PathProgramCache]: Analyzing trace with hash 1944856023, now seen corresponding path program 18 times [2018-10-27 15:32:18,122 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:18,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:18,123 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:18,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:18,123 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:18,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:18,688 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 15:32:18,688 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:18,688 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:18,688 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:18,688 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:18,689 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:18,689 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 15:32:18,698 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:32:18,698 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:32:18,793 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:32:18,794 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:18,799 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:18,840 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 15:32:18,840 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:19,318 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 15:32:19,341 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:19,342 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-10-27 15:32:19,342 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:19,342 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 15:32:19,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 15:32:19,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 15:32:19,343 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand 23 states. [2018-10-27 15:32:19,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:19,704 INFO L93 Difference]: Finished difference Result 204 states and 207 transitions. [2018-10-27 15:32:19,707 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 15:32:19,707 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 129 [2018-10-27 15:32:19,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:19,709 INFO L225 Difference]: With dead ends: 204 [2018-10-27 15:32:19,709 INFO L226 Difference]: Without dead ends: 139 [2018-10-27 15:32:19,710 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 238 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 15:32:19,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-27 15:32:19,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 133. [2018-10-27 15:32:19,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-10-27 15:32:19,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 134 transitions. [2018-10-27 15:32:19,715 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 134 transitions. Word has length 129 [2018-10-27 15:32:19,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:19,715 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 134 transitions. [2018-10-27 15:32:19,715 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 15:32:19,715 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 134 transitions. [2018-10-27 15:32:19,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-10-27 15:32:19,716 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:19,716 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:19,716 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:19,717 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:19,717 INFO L82 PathProgramCache]: Analyzing trace with hash 709338098, now seen corresponding path program 19 times [2018-10-27 15:32:19,717 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:19,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:19,718 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:19,718 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:19,718 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:19,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:20,562 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 15:32:20,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:20,563 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:20,563 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:20,563 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:20,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:20,563 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 15:32:20,571 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:20,571 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:32:20,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:20,670 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:20,694 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 15:32:20,694 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:21,201 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 15:32:21,221 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:21,222 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-10-27 15:32:21,222 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:21,222 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 15:32:21,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 15:32:21,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 15:32:21,223 INFO L87 Difference]: Start difference. First operand 133 states and 134 transitions. Second operand 24 states. [2018-10-27 15:32:21,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:21,434 INFO L93 Difference]: Finished difference Result 211 states and 215 transitions. [2018-10-27 15:32:21,435 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 15:32:21,435 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 132 [2018-10-27 15:32:21,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:21,436 INFO L225 Difference]: With dead ends: 211 [2018-10-27 15:32:21,437 INFO L226 Difference]: Without dead ends: 146 [2018-10-27 15:32:21,438 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 15:32:21,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2018-10-27 15:32:21,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 136. [2018-10-27 15:32:21,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-10-27 15:32:21,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2018-10-27 15:32:21,443 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 132 [2018-10-27 15:32:21,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:21,444 INFO L481 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2018-10-27 15:32:21,444 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 15:32:21,444 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2018-10-27 15:32:21,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-10-27 15:32:21,444 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:21,444 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:21,445 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:21,445 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:21,445 INFO L82 PathProgramCache]: Analyzing trace with hash 1264561143, now seen corresponding path program 20 times [2018-10-27 15:32:21,445 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:21,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:21,446 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:21,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:21,446 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:21,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:22,123 INFO L134 CoverageAnalysis]: Checked inductivity of 1223 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 15:32:22,124 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:22,124 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:22,124 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:22,124 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:22,124 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:22,125 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 15:32:22,132 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:32:22,132 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:32:22,656 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2018-10-27 15:32:22,657 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:22,662 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:22,762 INFO L134 CoverageAnalysis]: Checked inductivity of 1223 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-10-27 15:32:22,763 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:23,307 INFO L134 CoverageAnalysis]: Checked inductivity of 1223 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-10-27 15:32:23,330 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:23,330 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 49 [2018-10-27 15:32:23,330 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:23,331 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 15:32:23,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 15:32:23,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1000, Invalid=1352, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 15:32:23,332 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand 27 states. [2018-10-27 15:32:23,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:23,653 INFO L93 Difference]: Finished difference Result 220 states and 225 transitions. [2018-10-27 15:32:23,654 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 15:32:23,654 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 135 [2018-10-27 15:32:23,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:23,655 INFO L225 Difference]: With dead ends: 220 [2018-10-27 15:32:23,656 INFO L226 Difference]: Without dead ends: 150 [2018-10-27 15:32:23,658 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 246 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1006, Invalid=1444, Unknown=0, NotChecked=0, Total=2450 [2018-10-27 15:32:23,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-10-27 15:32:23,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 148. [2018-10-27 15:32:23,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2018-10-27 15:32:23,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 149 transitions. [2018-10-27 15:32:23,662 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 149 transitions. Word has length 135 [2018-10-27 15:32:23,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:23,663 INFO L481 AbstractCegarLoop]: Abstraction has 148 states and 149 transitions. [2018-10-27 15:32:23,663 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 15:32:23,663 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 149 transitions. [2018-10-27 15:32:23,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-10-27 15:32:23,664 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:23,664 INFO L375 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:23,664 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:23,664 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:23,664 INFO L82 PathProgramCache]: Analyzing trace with hash 1991732244, now seen corresponding path program 21 times [2018-10-27 15:32:23,665 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:23,665 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:23,665 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:23,665 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:23,666 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:23,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:24,013 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 15:32:24,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:24,014 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:24,014 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:24,014 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:24,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:24,014 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 15:32:24,022 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:32:24,022 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:32:24,139 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:32:24,139 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:24,143 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:24,197 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 15:32:24,197 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:24,826 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 15:32:24,847 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:24,847 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-10-27 15:32:24,847 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:24,847 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-27 15:32:24,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-27 15:32:24,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 15:32:24,849 INFO L87 Difference]: Start difference. First operand 148 states and 149 transitions. Second operand 26 states. [2018-10-27 15:32:25,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:25,194 INFO L93 Difference]: Finished difference Result 231 states and 234 transitions. [2018-10-27 15:32:25,194 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 15:32:25,194 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 147 [2018-10-27 15:32:25,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:25,196 INFO L225 Difference]: With dead ends: 231 [2018-10-27 15:32:25,196 INFO L226 Difference]: Without dead ends: 157 [2018-10-27 15:32:25,197 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 271 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 15:32:25,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-27 15:32:25,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 151. [2018-10-27 15:32:25,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-10-27 15:32:25,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 152 transitions. [2018-10-27 15:32:25,202 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 152 transitions. Word has length 147 [2018-10-27 15:32:25,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:25,202 INFO L481 AbstractCegarLoop]: Abstraction has 151 states and 152 transitions. [2018-10-27 15:32:25,202 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-27 15:32:25,203 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 152 transitions. [2018-10-27 15:32:25,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-10-27 15:32:25,204 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:25,204 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:25,204 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:25,204 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:25,204 INFO L82 PathProgramCache]: Analyzing trace with hash -110642833, now seen corresponding path program 22 times [2018-10-27 15:32:25,204 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:25,205 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:25,205 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:25,205 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:25,205 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:25,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:25,757 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 15:32:25,757 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:25,758 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:25,758 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:25,758 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:25,758 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:25,758 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 15:32:25,767 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:25,767 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:32:25,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:25,882 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:25,920 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 15:32:25,921 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:26,703 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 15:32:26,725 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:26,725 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-10-27 15:32:26,725 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:26,725 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 15:32:26,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 15:32:26,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 15:32:26,727 INFO L87 Difference]: Start difference. First operand 151 states and 152 transitions. Second operand 27 states. [2018-10-27 15:32:27,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:27,064 INFO L93 Difference]: Finished difference Result 238 states and 242 transitions. [2018-10-27 15:32:27,065 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 15:32:27,065 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 150 [2018-10-27 15:32:27,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:27,066 INFO L225 Difference]: With dead ends: 238 [2018-10-27 15:32:27,067 INFO L226 Difference]: Without dead ends: 164 [2018-10-27 15:32:27,068 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 276 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 15:32:27,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2018-10-27 15:32:27,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 154. [2018-10-27 15:32:27,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-27 15:32:27,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 155 transitions. [2018-10-27 15:32:27,074 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 155 transitions. Word has length 150 [2018-10-27 15:32:27,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:27,075 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 155 transitions. [2018-10-27 15:32:27,075 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 15:32:27,075 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 155 transitions. [2018-10-27 15:32:27,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-10-27 15:32:27,076 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:27,076 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:27,077 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:27,077 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:27,077 INFO L82 PathProgramCache]: Analyzing trace with hash 1541515828, now seen corresponding path program 23 times [2018-10-27 15:32:27,077 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:27,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:27,078 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:27,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:27,078 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:27,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:28,430 INFO L134 CoverageAnalysis]: Checked inductivity of 1613 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 15:32:28,430 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:28,430 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:28,430 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:28,431 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:28,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:28,431 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 15:32:28,438 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:32:28,438 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:32:29,284 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-10-27 15:32:29,285 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:29,290 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:29,359 INFO L134 CoverageAnalysis]: Checked inductivity of 1613 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-27 15:32:29,359 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:30,075 INFO L134 CoverageAnalysis]: Checked inductivity of 1613 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-27 15:32:30,097 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:30,098 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 55 [2018-10-27 15:32:30,098 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:30,098 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-27 15:32:30,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-27 15:32:30,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1285, Invalid=1685, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 15:32:30,100 INFO L87 Difference]: Start difference. First operand 154 states and 155 transitions. Second operand 30 states. [2018-10-27 15:32:31,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:31,546 INFO L93 Difference]: Finished difference Result 247 states and 252 transitions. [2018-10-27 15:32:31,547 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-27 15:32:31,547 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 153 [2018-10-27 15:32:31,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:31,548 INFO L225 Difference]: With dead ends: 247 [2018-10-27 15:32:31,548 INFO L226 Difference]: Without dead ends: 168 [2018-10-27 15:32:31,550 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1291, Invalid=1789, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 15:32:31,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2018-10-27 15:32:31,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 166. [2018-10-27 15:32:31,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-10-27 15:32:31,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 167 transitions. [2018-10-27 15:32:31,555 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 167 transitions. Word has length 153 [2018-10-27 15:32:31,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:31,555 INFO L481 AbstractCegarLoop]: Abstraction has 166 states and 167 transitions. [2018-10-27 15:32:31,556 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-27 15:32:31,556 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 167 transitions. [2018-10-27 15:32:31,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-10-27 15:32:31,557 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:31,557 INFO L375 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:31,557 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:31,557 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:31,557 INFO L82 PathProgramCache]: Analyzing trace with hash 1394469687, now seen corresponding path program 24 times [2018-10-27 15:32:31,557 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:31,558 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:31,558 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:31,558 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:31,558 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:31,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:32,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 15:32:32,391 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:32,391 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:32,391 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:32,391 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:32,391 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:32,391 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:32:32,398 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:32:32,399 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:32:32,518 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:32:32,519 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:32,524 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:32,655 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 15:32:32,655 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:34,216 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 15:32:34,239 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:34,240 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-10-27 15:32:34,240 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:34,240 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-27 15:32:34,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-27 15:32:34,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 15:32:34,241 INFO L87 Difference]: Start difference. First operand 166 states and 167 transitions. Second operand 29 states. [2018-10-27 15:32:34,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:34,509 INFO L93 Difference]: Finished difference Result 258 states and 261 transitions. [2018-10-27 15:32:34,510 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 15:32:34,510 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 165 [2018-10-27 15:32:34,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:34,512 INFO L225 Difference]: With dead ends: 258 [2018-10-27 15:32:34,512 INFO L226 Difference]: Without dead ends: 175 [2018-10-27 15:32:34,514 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 304 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 15:32:34,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-10-27 15:32:34,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 169. [2018-10-27 15:32:34,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-10-27 15:32:34,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2018-10-27 15:32:34,519 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 165 [2018-10-27 15:32:34,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:34,519 INFO L481 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2018-10-27 15:32:34,519 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-27 15:32:34,520 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2018-10-27 15:32:34,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-10-27 15:32:34,520 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:34,521 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:34,521 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:34,521 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:34,521 INFO L82 PathProgramCache]: Analyzing trace with hash -456804398, now seen corresponding path program 25 times [2018-10-27 15:32:34,521 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:34,522 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:34,522 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:34,522 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:34,522 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:34,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:36,053 INFO L134 CoverageAnalysis]: Checked inductivity of 1977 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 15:32:36,053 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:36,053 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:36,053 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:36,054 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:36,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:36,054 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 15:32:36,064 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:36,064 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:32:36,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:36,195 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:36,239 INFO L134 CoverageAnalysis]: Checked inductivity of 1977 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 15:32:36,239 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:37,618 INFO L134 CoverageAnalysis]: Checked inductivity of 1977 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 15:32:37,639 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:37,639 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-10-27 15:32:37,639 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:37,639 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-27 15:32:37,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-27 15:32:37,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 15:32:37,641 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand 30 states. [2018-10-27 15:32:38,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:38,065 INFO L93 Difference]: Finished difference Result 265 states and 269 transitions. [2018-10-27 15:32:38,065 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-27 15:32:38,065 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 168 [2018-10-27 15:32:38,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:38,067 INFO L225 Difference]: With dead ends: 265 [2018-10-27 15:32:38,067 INFO L226 Difference]: Without dead ends: 182 [2018-10-27 15:32:38,069 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 309 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 15:32:38,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-10-27 15:32:38,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 172. [2018-10-27 15:32:38,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-10-27 15:32:38,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 173 transitions. [2018-10-27 15:32:38,075 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 173 transitions. Word has length 168 [2018-10-27 15:32:38,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:38,075 INFO L481 AbstractCegarLoop]: Abstraction has 172 states and 173 transitions. [2018-10-27 15:32:38,075 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-27 15:32:38,075 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 173 transitions. [2018-10-27 15:32:38,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2018-10-27 15:32:38,076 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:38,076 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:38,077 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:38,077 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:38,077 INFO L82 PathProgramCache]: Analyzing trace with hash -88022697, now seen corresponding path program 26 times [2018-10-27 15:32:38,077 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:38,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:38,078 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:38,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:38,078 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:38,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:38,563 INFO L134 CoverageAnalysis]: Checked inductivity of 2057 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 15:32:38,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:38,564 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:38,564 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:38,564 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:38,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:38,564 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 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 15:32:38,573 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:32:38,573 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:32:39,892 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2018-10-27 15:32:39,892 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:39,899 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:40,022 INFO L134 CoverageAnalysis]: Checked inductivity of 2057 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-27 15:32:40,022 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:41,148 INFO L134 CoverageAnalysis]: Checked inductivity of 2057 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-27 15:32:41,172 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:41,173 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 61 [2018-10-27 15:32:41,173 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:41,173 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-27 15:32:41,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-27 15:32:41,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1606, Invalid=2054, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 15:32:41,174 INFO L87 Difference]: Start difference. First operand 172 states and 173 transitions. Second operand 33 states. [2018-10-27 15:32:41,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:41,522 INFO L93 Difference]: Finished difference Result 274 states and 279 transitions. [2018-10-27 15:32:41,523 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 15:32:41,523 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 171 [2018-10-27 15:32:41,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:41,524 INFO L225 Difference]: With dead ends: 274 [2018-10-27 15:32:41,524 INFO L226 Difference]: Without dead ends: 186 [2018-10-27 15:32:41,525 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 312 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1612, Invalid=2170, Unknown=0, NotChecked=0, Total=3782 [2018-10-27 15:32:41,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-10-27 15:32:41,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 184. [2018-10-27 15:32:41,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-10-27 15:32:41,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 185 transitions. [2018-10-27 15:32:41,530 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 185 transitions. Word has length 171 [2018-10-27 15:32:41,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:41,531 INFO L481 AbstractCegarLoop]: Abstraction has 184 states and 185 transitions. [2018-10-27 15:32:41,531 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-27 15:32:41,531 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 185 transitions. [2018-10-27 15:32:41,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2018-10-27 15:32:41,532 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:41,532 INFO L375 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:41,532 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:41,532 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:41,533 INFO L82 PathProgramCache]: Analyzing trace with hash 841557044, now seen corresponding path program 27 times [2018-10-27 15:32:41,533 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:41,533 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:41,533 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:41,534 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:41,534 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:41,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:42,678 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 15:32:42,678 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:42,678 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:42,678 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:42,679 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:42,679 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:42,679 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 15:32:42,687 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:32:42,687 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:32:42,844 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:32:42,844 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:42,850 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:42,941 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 15:32:42,941 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:44,323 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 15:32:44,345 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:44,345 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-10-27 15:32:44,345 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:44,346 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-27 15:32:44,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-27 15:32:44,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 15:32:44,347 INFO L87 Difference]: Start difference. First operand 184 states and 185 transitions. Second operand 32 states. [2018-10-27 15:32:44,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:44,720 INFO L93 Difference]: Finished difference Result 285 states and 288 transitions. [2018-10-27 15:32:44,720 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-27 15:32:44,721 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 183 [2018-10-27 15:32:44,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:44,722 INFO L225 Difference]: With dead ends: 285 [2018-10-27 15:32:44,723 INFO L226 Difference]: Without dead ends: 193 [2018-10-27 15:32:44,724 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 337 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 15:32:44,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-10-27 15:32:44,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 187. [2018-10-27 15:32:44,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-10-27 15:32:44,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 188 transitions. [2018-10-27 15:32:44,729 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 188 transitions. Word has length 183 [2018-10-27 15:32:44,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:44,730 INFO L481 AbstractCegarLoop]: Abstraction has 187 states and 188 transitions. [2018-10-27 15:32:44,730 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-27 15:32:44,730 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 188 transitions. [2018-10-27 15:32:44,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-10-27 15:32:44,731 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:44,731 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:44,731 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:44,732 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:44,732 INFO L82 PathProgramCache]: Analyzing trace with hash -1809899505, now seen corresponding path program 28 times [2018-10-27 15:32:44,732 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:44,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:44,733 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:44,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:44,733 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:44,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:45,244 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 15:32:45,245 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:45,245 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:45,245 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:45,245 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:45,245 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:45,245 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 15:32:45,253 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:45,253 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:32:45,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:45,394 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:45,424 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 15:32:45,424 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:46,620 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 15:32:46,641 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:46,642 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2018-10-27 15:32:46,642 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:46,642 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-27 15:32:46,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-27 15:32:46,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-27 15:32:46,644 INFO L87 Difference]: Start difference. First operand 187 states and 188 transitions. Second operand 33 states. [2018-10-27 15:32:46,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:46,966 INFO L93 Difference]: Finished difference Result 292 states and 296 transitions. [2018-10-27 15:32:46,967 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 15:32:46,967 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 186 [2018-10-27 15:32:46,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:46,968 INFO L225 Difference]: With dead ends: 292 [2018-10-27 15:32:46,969 INFO L226 Difference]: Without dead ends: 200 [2018-10-27 15:32:46,970 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-27 15:32:46,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2018-10-27 15:32:46,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 190. [2018-10-27 15:32:46,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2018-10-27 15:32:46,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 191 transitions. [2018-10-27 15:32:46,975 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 191 transitions. Word has length 186 [2018-10-27 15:32:46,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:46,976 INFO L481 AbstractCegarLoop]: Abstraction has 190 states and 191 transitions. [2018-10-27 15:32:46,976 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-27 15:32:46,976 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 191 transitions. [2018-10-27 15:32:46,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-10-27 15:32:46,977 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:46,977 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:46,977 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:46,978 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:46,978 INFO L82 PathProgramCache]: Analyzing trace with hash 1686557268, now seen corresponding path program 29 times [2018-10-27 15:32:46,978 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:46,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:46,979 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:46,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:46,979 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:47,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:47,856 INFO L134 CoverageAnalysis]: Checked inductivity of 2555 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 15:32:47,856 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:47,857 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:47,857 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:47,857 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:47,857 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:47,857 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 15:32:47,866 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:32:47,867 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:32:49,877 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2018-10-27 15:32:49,878 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:49,886 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:50,288 INFO L134 CoverageAnalysis]: Checked inductivity of 2555 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1365 trivial. 0 not checked. [2018-10-27 15:32:50,288 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:51,325 INFO L134 CoverageAnalysis]: Checked inductivity of 2555 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1365 trivial. 0 not checked. [2018-10-27 15:32:51,349 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:51,349 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 67 [2018-10-27 15:32:51,349 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:51,350 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-27 15:32:51,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-27 15:32:51,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1963, Invalid=2459, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 15:32:51,351 INFO L87 Difference]: Start difference. First operand 190 states and 191 transitions. Second operand 36 states. [2018-10-27 15:32:51,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:51,773 INFO L93 Difference]: Finished difference Result 301 states and 306 transitions. [2018-10-27 15:32:51,773 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-27 15:32:51,774 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 189 [2018-10-27 15:32:51,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:51,775 INFO L225 Difference]: With dead ends: 301 [2018-10-27 15:32:51,776 INFO L226 Difference]: Without dead ends: 204 [2018-10-27 15:32:51,777 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 345 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1969, Invalid=2587, Unknown=0, NotChecked=0, Total=4556 [2018-10-27 15:32:51,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2018-10-27 15:32:51,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 202. [2018-10-27 15:32:51,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2018-10-27 15:32:51,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 203 transitions. [2018-10-27 15:32:51,783 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 203 transitions. Word has length 189 [2018-10-27 15:32:51,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:51,783 INFO L481 AbstractCegarLoop]: Abstraction has 202 states and 203 transitions. [2018-10-27 15:32:51,783 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-27 15:32:51,783 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 203 transitions. [2018-10-27 15:32:51,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2018-10-27 15:32:51,784 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:51,785 INFO L375 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:51,785 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:51,785 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:51,785 INFO L82 PathProgramCache]: Analyzing trace with hash 852191383, now seen corresponding path program 30 times [2018-10-27 15:32:51,785 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:51,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:51,786 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:51,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:51,786 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:51,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:53,047 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 15:32:53,047 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:53,047 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:53,048 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:53,048 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:53,048 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:53,048 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 15:32:53,056 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:32:53,056 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:32:53,217 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:32:53,217 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:32:53,224 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:53,356 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 15:32:53,356 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:54,569 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 15:32:54,601 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:54,601 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2018-10-27 15:32:54,601 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:54,602 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-27 15:32:54,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-27 15:32:54,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 15:32:54,605 INFO L87 Difference]: Start difference. First operand 202 states and 203 transitions. Second operand 35 states. [2018-10-27 15:32:55,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:55,047 INFO L93 Difference]: Finished difference Result 312 states and 315 transitions. [2018-10-27 15:32:55,048 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-27 15:32:55,048 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 201 [2018-10-27 15:32:55,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:55,049 INFO L225 Difference]: With dead ends: 312 [2018-10-27 15:32:55,049 INFO L226 Difference]: Without dead ends: 211 [2018-10-27 15:32:55,050 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 370 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 15:32:55,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2018-10-27 15:32:55,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 205. [2018-10-27 15:32:55,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-10-27 15:32:55,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 206 transitions. [2018-10-27 15:32:55,056 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 206 transitions. Word has length 201 [2018-10-27 15:32:55,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:55,057 INFO L481 AbstractCegarLoop]: Abstraction has 205 states and 206 transitions. [2018-10-27 15:32:55,057 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-27 15:32:55,057 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 206 transitions. [2018-10-27 15:32:55,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-10-27 15:32:55,058 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:55,058 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:55,059 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:55,059 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:55,059 INFO L82 PathProgramCache]: Analyzing trace with hash -535149646, now seen corresponding path program 31 times [2018-10-27 15:32:55,059 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:55,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:55,060 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:32:55,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:55,060 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:55,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:55,894 INFO L134 CoverageAnalysis]: Checked inductivity of 3009 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 15:32:55,894 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:55,894 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:55,894 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:55,894 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:55,894 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:55,894 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 15:32:55,901 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:55,901 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:32:56,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:56,057 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:32:56,168 INFO L134 CoverageAnalysis]: Checked inductivity of 3009 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 15:32:56,168 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:32:57,382 INFO L134 CoverageAnalysis]: Checked inductivity of 3009 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 15:32:57,404 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:32:57,404 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-10-27 15:32:57,404 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:32:57,404 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-27 15:32:57,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-27 15:32:57,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 15:32:57,406 INFO L87 Difference]: Start difference. First operand 205 states and 206 transitions. Second operand 36 states. [2018-10-27 15:32:57,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:32:57,929 INFO L93 Difference]: Finished difference Result 319 states and 323 transitions. [2018-10-27 15:32:57,929 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-27 15:32:57,930 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 204 [2018-10-27 15:32:57,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:32:57,931 INFO L225 Difference]: With dead ends: 319 [2018-10-27 15:32:57,931 INFO L226 Difference]: Without dead ends: 218 [2018-10-27 15:32:57,932 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 442 GetRequests, 375 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 15:32:57,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2018-10-27 15:32:57,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 208. [2018-10-27 15:32:57,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2018-10-27 15:32:57,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 209 transitions. [2018-10-27 15:32:57,939 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 209 transitions. Word has length 204 [2018-10-27 15:32:57,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:32:57,940 INFO L481 AbstractCegarLoop]: Abstraction has 208 states and 209 transitions. [2018-10-27 15:32:57,940 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-27 15:32:57,940 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 209 transitions. [2018-10-27 15:32:57,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2018-10-27 15:32:57,941 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:32:57,941 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:32:57,941 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:32:57,942 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:32:57,942 INFO L82 PathProgramCache]: Analyzing trace with hash -341455177, now seen corresponding path program 32 times [2018-10-27 15:32:57,942 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:32:57,942 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:57,943 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:32:57,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:32:57,943 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:32:57,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:32:58,579 INFO L134 CoverageAnalysis]: Checked inductivity of 3107 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 15:32:58,579 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:58,579 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:32:58,579 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:32:58,579 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:32:58,579 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:32:58,579 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 15:32:58,587 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:32:58,587 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:33:01,815 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-10-27 15:33:01,815 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:01,823 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:02,147 INFO L134 CoverageAnalysis]: Checked inductivity of 3107 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2018-10-27 15:33:02,148 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:03,887 INFO L134 CoverageAnalysis]: Checked inductivity of 3107 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2018-10-27 15:33:03,911 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:03,911 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 73 [2018-10-27 15:33:03,911 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:03,912 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 15:33:03,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 15:33:03,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2356, Invalid=2900, Unknown=0, NotChecked=0, Total=5256 [2018-10-27 15:33:03,913 INFO L87 Difference]: Start difference. First operand 208 states and 209 transitions. Second operand 39 states. [2018-10-27 15:33:04,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:04,794 INFO L93 Difference]: Finished difference Result 328 states and 333 transitions. [2018-10-27 15:33:04,794 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-27 15:33:04,794 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 207 [2018-10-27 15:33:04,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:04,796 INFO L225 Difference]: With dead ends: 328 [2018-10-27 15:33:04,796 INFO L226 Difference]: Without dead ends: 222 [2018-10-27 15:33:04,797 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 378 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 365 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2362, Invalid=3040, Unknown=0, NotChecked=0, Total=5402 [2018-10-27 15:33:04,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-10-27 15:33:04,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 220. [2018-10-27 15:33:04,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2018-10-27 15:33:04,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 221 transitions. [2018-10-27 15:33:04,801 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 221 transitions. Word has length 207 [2018-10-27 15:33:04,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:04,801 INFO L481 AbstractCegarLoop]: Abstraction has 220 states and 221 transitions. [2018-10-27 15:33:04,802 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 15:33:04,802 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 221 transitions. [2018-10-27 15:33:04,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2018-10-27 15:33:04,802 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:04,803 INFO L375 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:04,803 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:04,803 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:04,803 INFO L82 PathProgramCache]: Analyzing trace with hash -1617730476, now seen corresponding path program 33 times [2018-10-27 15:33:04,803 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:04,804 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:04,804 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:04,804 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:04,804 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:04,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:05,479 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 15:33:05,480 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:05,480 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:05,480 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:05,480 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:05,480 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:05,480 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 15:33:05,488 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:33:05,488 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:33:05,651 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:33:05,652 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:05,657 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:05,705 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 15:33:05,705 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:07,033 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 15:33:07,055 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:07,055 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-10-27 15:33:07,055 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:07,056 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-27 15:33:07,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-27 15:33:07,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-27 15:33:07,057 INFO L87 Difference]: Start difference. First operand 220 states and 221 transitions. Second operand 38 states. [2018-10-27 15:33:07,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:07,447 INFO L93 Difference]: Finished difference Result 339 states and 342 transitions. [2018-10-27 15:33:07,447 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-27 15:33:07,447 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 219 [2018-10-27 15:33:07,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:07,449 INFO L225 Difference]: With dead ends: 339 [2018-10-27 15:33:07,449 INFO L226 Difference]: Without dead ends: 229 [2018-10-27 15:33:07,450 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 403 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-27 15:33:07,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2018-10-27 15:33:07,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 223. [2018-10-27 15:33:07,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2018-10-27 15:33:07,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 224 transitions. [2018-10-27 15:33:07,455 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 224 transitions. Word has length 219 [2018-10-27 15:33:07,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:07,455 INFO L481 AbstractCegarLoop]: Abstraction has 223 states and 224 transitions. [2018-10-27 15:33:07,455 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-27 15:33:07,456 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 224 transitions. [2018-10-27 15:33:07,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-10-27 15:33:07,457 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:07,457 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:07,457 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:07,457 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:07,458 INFO L82 PathProgramCache]: Analyzing trace with hash 1207553711, now seen corresponding path program 34 times [2018-10-27 15:33:07,458 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:07,458 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:07,458 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:07,459 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:07,459 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:07,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:08,466 INFO L134 CoverageAnalysis]: Checked inductivity of 3606 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 15:33:08,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:08,466 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:08,467 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:08,467 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:08,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:08,467 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 15:33:08,474 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:08,475 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:33:08,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:08,648 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:08,761 INFO L134 CoverageAnalysis]: Checked inductivity of 3606 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 15:33:08,761 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:10,385 INFO L134 CoverageAnalysis]: Checked inductivity of 3606 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 15:33:10,408 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:10,408 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 75 [2018-10-27 15:33:10,408 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:10,409 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 15:33:10,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 15:33:10,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-27 15:33:10,410 INFO L87 Difference]: Start difference. First operand 223 states and 224 transitions. Second operand 39 states. [2018-10-27 15:33:10,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:10,804 INFO L93 Difference]: Finished difference Result 346 states and 350 transitions. [2018-10-27 15:33:10,804 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-27 15:33:10,804 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 222 [2018-10-27 15:33:10,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:10,806 INFO L225 Difference]: With dead ends: 346 [2018-10-27 15:33:10,806 INFO L226 Difference]: Without dead ends: 236 [2018-10-27 15:33:10,807 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 408 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-27 15:33:10,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2018-10-27 15:33:10,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 226. [2018-10-27 15:33:10,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2018-10-27 15:33:10,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 227 transitions. [2018-10-27 15:33:10,812 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 227 transitions. Word has length 222 [2018-10-27 15:33:10,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:10,813 INFO L481 AbstractCegarLoop]: Abstraction has 226 states and 227 transitions. [2018-10-27 15:33:10,813 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 15:33:10,813 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 227 transitions. [2018-10-27 15:33:10,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2018-10-27 15:33:10,814 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:10,814 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:10,815 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:10,815 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:10,815 INFO L82 PathProgramCache]: Analyzing trace with hash 774668916, now seen corresponding path program 35 times [2018-10-27 15:33:10,815 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:10,816 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:10,816 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:10,816 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:10,816 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:10,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:11,688 INFO L134 CoverageAnalysis]: Checked inductivity of 3713 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 15:33:11,688 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:11,688 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:11,688 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:11,689 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:11,689 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:11,689 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 15:33:11,697 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:33:11,697 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:33:16,485 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2018-10-27 15:33:16,485 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:16,493 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:16,584 INFO L134 CoverageAnalysis]: Checked inductivity of 3713 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1962 trivial. 0 not checked. [2018-10-27 15:33:16,584 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:18,311 INFO L134 CoverageAnalysis]: Checked inductivity of 3713 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1962 trivial. 0 not checked. [2018-10-27 15:33:18,334 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:18,335 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 79 [2018-10-27 15:33:18,335 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:18,335 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-27 15:33:18,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-27 15:33:18,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2785, Invalid=3377, Unknown=0, NotChecked=0, Total=6162 [2018-10-27 15:33:18,336 INFO L87 Difference]: Start difference. First operand 226 states and 227 transitions. Second operand 42 states. [2018-10-27 15:33:18,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:18,751 INFO L93 Difference]: Finished difference Result 355 states and 360 transitions. [2018-10-27 15:33:18,757 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-27 15:33:18,757 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 225 [2018-10-27 15:33:18,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:18,758 INFO L225 Difference]: With dead ends: 355 [2018-10-27 15:33:18,759 INFO L226 Difference]: Without dead ends: 240 [2018-10-27 15:33:18,759 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 411 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 398 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2791, Invalid=3529, Unknown=0, NotChecked=0, Total=6320 [2018-10-27 15:33:18,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2018-10-27 15:33:18,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 238. [2018-10-27 15:33:18,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2018-10-27 15:33:18,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 239 transitions. [2018-10-27 15:33:18,763 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 239 transitions. Word has length 225 [2018-10-27 15:33:18,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:18,763 INFO L481 AbstractCegarLoop]: Abstraction has 238 states and 239 transitions. [2018-10-27 15:33:18,763 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-27 15:33:18,763 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 239 transitions. [2018-10-27 15:33:18,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2018-10-27 15:33:18,764 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:18,764 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:18,765 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:18,765 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:18,765 INFO L82 PathProgramCache]: Analyzing trace with hash -74539529, now seen corresponding path program 36 times [2018-10-27 15:33:18,765 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:18,765 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:18,766 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:18,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:18,766 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:18,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:19,640 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 15:33:19,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:19,641 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:19,641 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:19,641 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:19,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:19,641 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 15:33:19,656 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:33:19,656 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:33:19,827 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:33:19,827 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:19,832 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:19,890 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 15:33:19,890 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:21,932 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 15:33:21,955 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:21,955 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2018-10-27 15:33:21,955 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:21,956 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-27 15:33:21,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-27 15:33:21,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-27 15:33:21,957 INFO L87 Difference]: Start difference. First operand 238 states and 239 transitions. Second operand 41 states. [2018-10-27 15:33:22,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:22,371 INFO L93 Difference]: Finished difference Result 366 states and 369 transitions. [2018-10-27 15:33:22,372 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-27 15:33:22,372 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 237 [2018-10-27 15:33:22,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:22,374 INFO L225 Difference]: With dead ends: 366 [2018-10-27 15:33:22,374 INFO L226 Difference]: Without dead ends: 247 [2018-10-27 15:33:22,375 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 436 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-27 15:33:22,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-10-27 15:33:22,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 241. [2018-10-27 15:33:22,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2018-10-27 15:33:22,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 242 transitions. [2018-10-27 15:33:22,379 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 242 transitions. Word has length 237 [2018-10-27 15:33:22,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:22,380 INFO L481 AbstractCegarLoop]: Abstraction has 241 states and 242 transitions. [2018-10-27 15:33:22,380 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-27 15:33:22,380 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 242 transitions. [2018-10-27 15:33:22,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2018-10-27 15:33:22,381 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:22,381 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:22,381 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:22,381 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:22,381 INFO L82 PathProgramCache]: Analyzing trace with hash 1048528786, now seen corresponding path program 37 times [2018-10-27 15:33:22,381 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:22,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:22,382 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:22,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:22,382 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:22,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:23,223 INFO L134 CoverageAnalysis]: Checked inductivity of 4257 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 15:33:23,224 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:23,224 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:23,224 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:23,224 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:23,224 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:23,224 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 15:33:23,231 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:23,231 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:33:23,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:23,414 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:23,533 INFO L134 CoverageAnalysis]: Checked inductivity of 4257 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 15:33:23,533 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:25,906 INFO L134 CoverageAnalysis]: Checked inductivity of 4257 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 15:33:25,928 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:25,928 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-10-27 15:33:25,928 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:25,929 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-27 15:33:25,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-27 15:33:25,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3240, Invalid=3240, Unknown=0, NotChecked=0, Total=6480 [2018-10-27 15:33:25,930 INFO L87 Difference]: Start difference. First operand 241 states and 242 transitions. Second operand 42 states. [2018-10-27 15:33:26,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:26,337 INFO L93 Difference]: Finished difference Result 373 states and 377 transitions. [2018-10-27 15:33:26,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-27 15:33:26,338 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 240 [2018-10-27 15:33:26,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:26,339 INFO L225 Difference]: With dead ends: 373 [2018-10-27 15:33:26,339 INFO L226 Difference]: Without dead ends: 254 [2018-10-27 15:33:26,340 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 520 GetRequests, 441 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3240, Invalid=3240, Unknown=0, NotChecked=0, Total=6480 [2018-10-27 15:33:26,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2018-10-27 15:33:26,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 244. [2018-10-27 15:33:26,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2018-10-27 15:33:26,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 245 transitions. [2018-10-27 15:33:26,346 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 245 transitions. Word has length 240 [2018-10-27 15:33:26,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:26,347 INFO L481 AbstractCegarLoop]: Abstraction has 244 states and 245 transitions. [2018-10-27 15:33:26,347 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-27 15:33:26,347 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 245 transitions. [2018-10-27 15:33:26,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2018-10-27 15:33:26,348 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:26,348 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:26,348 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:26,349 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:26,349 INFO L82 PathProgramCache]: Analyzing trace with hash 581465111, now seen corresponding path program 38 times [2018-10-27 15:33:26,349 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:26,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:26,350 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:26,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:26,350 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:26,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:27,168 INFO L134 CoverageAnalysis]: Checked inductivity of 4373 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 15:33:27,169 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:27,169 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:27,169 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:27,169 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:27,169 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:27,169 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 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 15:33:27,177 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:33:27,178 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:33:33,913 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-10-27 15:33:33,913 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:33,921 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:34,013 INFO L134 CoverageAnalysis]: Checked inductivity of 4373 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2301 trivial. 0 not checked. [2018-10-27 15:33:34,013 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:35,772 INFO L134 CoverageAnalysis]: Checked inductivity of 4373 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2301 trivial. 0 not checked. [2018-10-27 15:33:35,797 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:35,797 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 85 [2018-10-27 15:33:35,797 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:35,797 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-27 15:33:35,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-27 15:33:35,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3250, Invalid=3890, Unknown=0, NotChecked=0, Total=7140 [2018-10-27 15:33:35,799 INFO L87 Difference]: Start difference. First operand 244 states and 245 transitions. Second operand 45 states. [2018-10-27 15:33:36,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:36,263 INFO L93 Difference]: Finished difference Result 382 states and 387 transitions. [2018-10-27 15:33:36,263 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-27 15:33:36,264 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 243 [2018-10-27 15:33:36,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:36,265 INFO L225 Difference]: With dead ends: 382 [2018-10-27 15:33:36,265 INFO L226 Difference]: Without dead ends: 258 [2018-10-27 15:33:36,266 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 444 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3256, Invalid=4054, Unknown=0, NotChecked=0, Total=7310 [2018-10-27 15:33:36,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2018-10-27 15:33:36,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 256. [2018-10-27 15:33:36,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2018-10-27 15:33:36,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 257 transitions. [2018-10-27 15:33:36,272 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 257 transitions. Word has length 243 [2018-10-27 15:33:36,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:36,273 INFO L481 AbstractCegarLoop]: Abstraction has 256 states and 257 transitions. [2018-10-27 15:33:36,273 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-27 15:33:36,273 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 257 transitions. [2018-10-27 15:33:36,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2018-10-27 15:33:36,274 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:36,274 INFO L375 BasicCegarLoop]: trace histogram [41, 41, 40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:36,275 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:36,275 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:36,275 INFO L82 PathProgramCache]: Analyzing trace with hash -1711526796, now seen corresponding path program 39 times [2018-10-27 15:33:36,275 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:36,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:36,276 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:36,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:36,276 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:36,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:37,078 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 15:33:37,079 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:37,079 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:37,079 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:37,079 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:37,079 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:37,079 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 15:33:37,087 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:33:37,087 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:33:37,275 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:33:37,275 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:37,282 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:37,366 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 15:33:37,366 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:39,548 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 15:33:39,571 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:39,571 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 85 [2018-10-27 15:33:39,571 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:39,572 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-27 15:33:39,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-27 15:33:39,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3570, Invalid=3570, Unknown=0, NotChecked=0, Total=7140 [2018-10-27 15:33:39,573 INFO L87 Difference]: Start difference. First operand 256 states and 257 transitions. Second operand 44 states. [2018-10-27 15:33:40,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:40,073 INFO L93 Difference]: Finished difference Result 393 states and 396 transitions. [2018-10-27 15:33:40,073 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-27 15:33:40,074 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 255 [2018-10-27 15:33:40,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:40,075 INFO L225 Difference]: With dead ends: 393 [2018-10-27 15:33:40,075 INFO L226 Difference]: Without dead ends: 265 [2018-10-27 15:33:40,076 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 552 GetRequests, 469 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3570, Invalid=3570, Unknown=0, NotChecked=0, Total=7140 [2018-10-27 15:33:40,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2018-10-27 15:33:40,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 259. [2018-10-27 15:33:40,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2018-10-27 15:33:40,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 260 transitions. [2018-10-27 15:33:40,082 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 260 transitions. Word has length 255 [2018-10-27 15:33:40,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:40,082 INFO L481 AbstractCegarLoop]: Abstraction has 259 states and 260 transitions. [2018-10-27 15:33:40,082 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-27 15:33:40,082 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 260 transitions. [2018-10-27 15:33:40,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-10-27 15:33:40,084 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:40,084 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:40,084 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:40,084 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:40,085 INFO L82 PathProgramCache]: Analyzing trace with hash 27116879, now seen corresponding path program 40 times [2018-10-27 15:33:40,085 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:40,085 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:40,085 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:40,085 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:40,086 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:40,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:41,627 INFO L134 CoverageAnalysis]: Checked inductivity of 4962 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 15:33:41,627 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:41,628 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:41,628 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:41,628 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:41,628 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:41,628 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 15:33:41,635 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:41,635 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:33:41,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:41,823 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:41,963 INFO L134 CoverageAnalysis]: Checked inductivity of 4962 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 15:33:41,963 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:44,633 INFO L134 CoverageAnalysis]: Checked inductivity of 4962 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 15:33:44,654 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:44,655 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2018-10-27 15:33:44,655 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:44,656 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-27 15:33:44,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-27 15:33:44,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3741, Invalid=3741, Unknown=0, NotChecked=0, Total=7482 [2018-10-27 15:33:44,657 INFO L87 Difference]: Start difference. First operand 259 states and 260 transitions. Second operand 45 states. [2018-10-27 15:33:45,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:45,136 INFO L93 Difference]: Finished difference Result 400 states and 404 transitions. [2018-10-27 15:33:45,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-27 15:33:45,137 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 258 [2018-10-27 15:33:45,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:45,138 INFO L225 Difference]: With dead ends: 400 [2018-10-27 15:33:45,138 INFO L226 Difference]: Without dead ends: 272 [2018-10-27 15:33:45,139 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 559 GetRequests, 474 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3741, Invalid=3741, Unknown=0, NotChecked=0, Total=7482 [2018-10-27 15:33:45,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2018-10-27 15:33:45,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 262. [2018-10-27 15:33:45,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 262 states. [2018-10-27 15:33:45,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 263 transitions. [2018-10-27 15:33:45,143 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 263 transitions. Word has length 258 [2018-10-27 15:33:45,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:45,144 INFO L481 AbstractCegarLoop]: Abstraction has 262 states and 263 transitions. [2018-10-27 15:33:45,144 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-27 15:33:45,144 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 263 transitions. [2018-10-27 15:33:45,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2018-10-27 15:33:45,145 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:45,146 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:45,146 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:45,146 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:45,146 INFO L82 PathProgramCache]: Analyzing trace with hash -1344750956, now seen corresponding path program 41 times [2018-10-27 15:33:45,146 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:45,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:45,147 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:45,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:45,147 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:45,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:46,362 INFO L134 CoverageAnalysis]: Checked inductivity of 5087 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 15:33:46,362 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:46,362 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:46,362 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:46,362 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:46,362 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:46,363 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 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:33:46,371 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:33:46,371 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:33:56,088 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-10-27 15:33:56,089 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:56,101 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:56,227 INFO L134 CoverageAnalysis]: Checked inductivity of 5087 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2667 trivial. 0 not checked. [2018-10-27 15:33:56,228 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:58,213 INFO L134 CoverageAnalysis]: Checked inductivity of 5087 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2667 trivial. 0 not checked. [2018-10-27 15:33:58,236 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:58,237 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 91 [2018-10-27 15:33:58,237 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:58,237 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-27 15:33:58,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-27 15:33:58,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3751, Invalid=4439, Unknown=0, NotChecked=0, Total=8190 [2018-10-27 15:33:58,239 INFO L87 Difference]: Start difference. First operand 262 states and 263 transitions. Second operand 48 states. [2018-10-27 15:33:58,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:58,746 INFO L93 Difference]: Finished difference Result 409 states and 414 transitions. [2018-10-27 15:33:58,746 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-27 15:33:58,746 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 261 [2018-10-27 15:33:58,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:58,747 INFO L225 Difference]: With dead ends: 409 [2018-10-27 15:33:58,747 INFO L226 Difference]: Without dead ends: 276 [2018-10-27 15:33:58,748 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 567 GetRequests, 477 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3757, Invalid=4615, Unknown=0, NotChecked=0, Total=8372 [2018-10-27 15:33:58,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2018-10-27 15:33:58,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 274. [2018-10-27 15:33:58,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2018-10-27 15:33:58,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 275 transitions. [2018-10-27 15:33:58,756 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 275 transitions. Word has length 261 [2018-10-27 15:33:58,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:58,756 INFO L481 AbstractCegarLoop]: Abstraction has 274 states and 275 transitions. [2018-10-27 15:33:58,756 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-27 15:33:58,756 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 275 transitions. [2018-10-27 15:33:58,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2018-10-27 15:33:58,758 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:58,758 INFO L375 BasicCegarLoop]: trace histogram [44, 44, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:58,759 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:58,759 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:58,759 INFO L82 PathProgramCache]: Analyzing trace with hash -1216246953, now seen corresponding path program 42 times [2018-10-27 15:33:58,759 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:58,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:58,760 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:58,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:58,760 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:58,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:59,759 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 15:33:59,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:59,759 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:59,760 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:59,760 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:59,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:59,760 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 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:33:59,767 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:33:59,767 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:33:59,970 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:33:59,970 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:59,977 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:00,052 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 15:34:00,052 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:02,189 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 15:34:02,211 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:02,211 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 91 [2018-10-27 15:34:02,211 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:02,212 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-27 15:34:02,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-27 15:34:02,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4095, Invalid=4095, Unknown=0, NotChecked=0, Total=8190 [2018-10-27 15:34:02,213 INFO L87 Difference]: Start difference. First operand 274 states and 275 transitions. Second operand 47 states. [2018-10-27 15:34:02,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:02,787 INFO L93 Difference]: Finished difference Result 420 states and 423 transitions. [2018-10-27 15:34:02,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-27 15:34:02,787 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 273 [2018-10-27 15:34:02,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:02,789 INFO L225 Difference]: With dead ends: 420 [2018-10-27 15:34:02,789 INFO L226 Difference]: Without dead ends: 283 [2018-10-27 15:34:02,791 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=4095, Invalid=4095, Unknown=0, NotChecked=0, Total=8190 [2018-10-27 15:34:02,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2018-10-27 15:34:02,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 277. [2018-10-27 15:34:02,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 277 states. [2018-10-27 15:34:02,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 278 transitions. [2018-10-27 15:34:02,798 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 278 transitions. Word has length 273 [2018-10-27 15:34:02,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:02,798 INFO L481 AbstractCegarLoop]: Abstraction has 277 states and 278 transitions. [2018-10-27 15:34:02,798 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-27 15:34:02,799 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 278 transitions. [2018-10-27 15:34:02,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2018-10-27 15:34:02,800 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:02,800 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:02,800 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:02,801 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:02,801 INFO L82 PathProgramCache]: Analyzing trace with hash -206650510, now seen corresponding path program 43 times [2018-10-27 15:34:02,801 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:02,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:02,801 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:34:02,802 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:02,802 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:02,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:03,837 INFO L134 CoverageAnalysis]: Checked inductivity of 5721 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 15:34:03,837 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:03,837 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:03,837 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:03,838 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:03,838 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:03,838 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 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:03,846 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:03,846 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:34:04,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:04,051 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:04,144 INFO L134 CoverageAnalysis]: Checked inductivity of 5721 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 15:34:04,144 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:06,540 INFO L134 CoverageAnalysis]: Checked inductivity of 5721 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 15:34:06,561 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:06,561 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-10-27 15:34:06,561 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:06,562 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-27 15:34:06,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-27 15:34:06,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4278, Invalid=4278, Unknown=0, NotChecked=0, Total=8556 [2018-10-27 15:34:06,563 INFO L87 Difference]: Start difference. First operand 277 states and 278 transitions. Second operand 48 states. [2018-10-27 15:34:07,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:07,120 INFO L93 Difference]: Finished difference Result 427 states and 431 transitions. [2018-10-27 15:34:07,120 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-27 15:34:07,121 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 276 [2018-10-27 15:34:07,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:07,122 INFO L225 Difference]: With dead ends: 427 [2018-10-27 15:34:07,122 INFO L226 Difference]: Without dead ends: 290 [2018-10-27 15:34:07,123 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 598 GetRequests, 507 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=4278, Invalid=4278, Unknown=0, NotChecked=0, Total=8556 [2018-10-27 15:34:07,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2018-10-27 15:34:07,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 280. [2018-10-27 15:34:07,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2018-10-27 15:34:07,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 281 transitions. [2018-10-27 15:34:07,129 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 281 transitions. Word has length 276 [2018-10-27 15:34:07,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:07,129 INFO L481 AbstractCegarLoop]: Abstraction has 280 states and 281 transitions. [2018-10-27 15:34:07,129 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-27 15:34:07,130 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 281 transitions. [2018-10-27 15:34:07,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 280 [2018-10-27 15:34:07,131 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:07,131 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:07,132 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:07,132 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:07,132 INFO L82 PathProgramCache]: Analyzing trace with hash -974990985, now seen corresponding path program 44 times [2018-10-27 15:34:07,132 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:07,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:07,133 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:07,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:07,133 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:07,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:08,250 INFO L134 CoverageAnalysis]: Checked inductivity of 5855 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 15:34:08,250 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:08,251 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:08,251 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:08,251 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:08,251 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:08,251 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 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:08,260 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:34:08,260 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:34:35,360 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 44 check-sat command(s) [2018-10-27 15:34:35,360 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:34:35,375 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:35,516 INFO L134 CoverageAnalysis]: Checked inductivity of 5855 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 3060 trivial. 0 not checked. [2018-10-27 15:34:35,516 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:37,776 INFO L134 CoverageAnalysis]: Checked inductivity of 5855 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 3060 trivial. 0 not checked. [2018-10-27 15:34:37,803 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:37,803 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 97 [2018-10-27 15:34:37,803 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:37,804 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-27 15:34:37,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-27 15:34:37,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4288, Invalid=5024, Unknown=0, NotChecked=0, Total=9312 [2018-10-27 15:34:37,805 INFO L87 Difference]: Start difference. First operand 280 states and 281 transitions. Second operand 51 states. [2018-10-27 15:34:38,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:38,345 INFO L93 Difference]: Finished difference Result 436 states and 441 transitions. [2018-10-27 15:34:38,345 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-27 15:34:38,346 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 279 [2018-10-27 15:34:38,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:38,347 INFO L225 Difference]: With dead ends: 436 [2018-10-27 15:34:38,347 INFO L226 Difference]: Without dead ends: 294 [2018-10-27 15:34:38,348 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 606 GetRequests, 510 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 497 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=4294, Invalid=5212, Unknown=0, NotChecked=0, Total=9506 [2018-10-27 15:34:38,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2018-10-27 15:34:38,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 292. [2018-10-27 15:34:38,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2018-10-27 15:34:38,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 293 transitions. [2018-10-27 15:34:38,354 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 293 transitions. Word has length 279 [2018-10-27 15:34:38,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:38,354 INFO L481 AbstractCegarLoop]: Abstraction has 292 states and 293 transitions. [2018-10-27 15:34:38,354 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-27 15:34:38,354 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 293 transitions. [2018-10-27 15:34:38,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2018-10-27 15:34:38,355 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:38,355 INFO L375 BasicCegarLoop]: trace histogram [47, 47, 46, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:38,355 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:38,356 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:38,356 INFO L82 PathProgramCache]: Analyzing trace with hash -622232428, now seen corresponding path program 45 times [2018-10-27 15:34:38,356 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:38,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:38,356 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:34:38,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:38,357 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:38,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:39,799 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 15:34:39,799 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:39,799 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:39,799 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:39,799 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:39,799 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:39,799 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 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:39,807 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:34:39,807 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:34:40,042 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:34:40,042 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:34:40,049 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:40,114 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 15:34:40,115 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:42,527 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 15:34:42,548 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:42,548 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2018-10-27 15:34:42,548 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:42,549 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-27 15:34:42,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-27 15:34:42,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4656, Invalid=4656, Unknown=0, NotChecked=0, Total=9312 [2018-10-27 15:34:42,550 INFO L87 Difference]: Start difference. First operand 292 states and 293 transitions. Second operand 50 states. [2018-10-27 15:34:43,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:43,171 INFO L93 Difference]: Finished difference Result 447 states and 450 transitions. [2018-10-27 15:34:43,172 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-27 15:34:43,172 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 291 [2018-10-27 15:34:43,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:43,174 INFO L225 Difference]: With dead ends: 447 [2018-10-27 15:34:43,174 INFO L226 Difference]: Without dead ends: 301 [2018-10-27 15:34:43,175 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 630 GetRequests, 535 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4656, Invalid=4656, Unknown=0, NotChecked=0, Total=9312 [2018-10-27 15:34:43,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2018-10-27 15:34:43,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 295. [2018-10-27 15:34:43,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 295 states. [2018-10-27 15:34:43,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 296 transitions. [2018-10-27 15:34:43,181 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 296 transitions. Word has length 291 [2018-10-27 15:34:43,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:43,182 INFO L481 AbstractCegarLoop]: Abstraction has 295 states and 296 transitions. [2018-10-27 15:34:43,182 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-27 15:34:43,182 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 296 transitions. [2018-10-27 15:34:43,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2018-10-27 15:34:43,184 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:43,184 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:43,184 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:43,184 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:43,185 INFO L82 PathProgramCache]: Analyzing trace with hash 1009845231, now seen corresponding path program 46 times [2018-10-27 15:34:43,185 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:43,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:43,185 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:34:43,186 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:43,186 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:43,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:44,357 INFO L134 CoverageAnalysis]: Checked inductivity of 6534 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 15:34:44,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:44,358 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:44,358 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:44,358 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:44,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:44,358 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 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:44,365 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:44,365 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:34:44,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:44,582 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:44,638 INFO L134 CoverageAnalysis]: Checked inductivity of 6534 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 15:34:44,638 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:47,721 INFO L134 CoverageAnalysis]: Checked inductivity of 6534 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 15:34:47,742 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:47,743 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 99 [2018-10-27 15:34:47,743 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:47,743 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-27 15:34:47,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-27 15:34:47,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4851, Invalid=4851, Unknown=0, NotChecked=0, Total=9702 [2018-10-27 15:34:47,745 INFO L87 Difference]: Start difference. First operand 295 states and 296 transitions. Second operand 51 states. [2018-10-27 15:34:48,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:48,511 INFO L93 Difference]: Finished difference Result 454 states and 458 transitions. [2018-10-27 15:34:48,514 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-27 15:34:48,514 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 294 [2018-10-27 15:34:48,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:48,515 INFO L225 Difference]: With dead ends: 454 [2018-10-27 15:34:48,515 INFO L226 Difference]: Without dead ends: 308 [2018-10-27 15:34:48,516 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 637 GetRequests, 540 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=4851, Invalid=4851, Unknown=0, NotChecked=0, Total=9702 [2018-10-27 15:34:48,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2018-10-27 15:34:48,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 298. [2018-10-27 15:34:48,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 298 states. [2018-10-27 15:34:48,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 299 transitions. [2018-10-27 15:34:48,521 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 299 transitions. Word has length 294 [2018-10-27 15:34:48,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:48,522 INFO L481 AbstractCegarLoop]: Abstraction has 298 states and 299 transitions. [2018-10-27 15:34:48,522 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-27 15:34:48,522 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 299 transitions. [2018-10-27 15:34:48,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2018-10-27 15:34:48,523 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:48,524 INFO L375 BasicCegarLoop]: trace histogram [49, 48, 48, 47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:48,524 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:48,524 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:48,524 INFO L82 PathProgramCache]: Analyzing trace with hash -1089373516, now seen corresponding path program 47 times [2018-10-27 15:34:48,524 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:48,525 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:48,525 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:48,525 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:48,525 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:48,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:49,538 INFO L134 CoverageAnalysis]: Checked inductivity of 6677 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 15:34:49,538 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:49,538 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:49,538 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:49,538 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:49,538 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:49,539 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 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:49,546 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:34:49,546 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:35:06,513 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2018-10-27 15:35:06,513 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:35:06,532 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:35:06,645 INFO L134 CoverageAnalysis]: Checked inductivity of 6677 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3480 trivial. 0 not checked. [2018-10-27 15:35:06,645 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:35:09,264 INFO L134 CoverageAnalysis]: Checked inductivity of 6677 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3480 trivial. 0 not checked. [2018-10-27 15:35:09,292 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:35:09,292 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 103 [2018-10-27 15:35:09,293 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:35:09,293 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-27 15:35:09,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-27 15:35:09,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4861, Invalid=5645, Unknown=0, NotChecked=0, Total=10506 [2018-10-27 15:35:09,294 INFO L87 Difference]: Start difference. First operand 298 states and 299 transitions. Second operand 54 states. [2018-10-27 15:35:09,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:35:09,823 INFO L93 Difference]: Finished difference Result 463 states and 468 transitions. [2018-10-27 15:35:09,823 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-27 15:35:09,823 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 297 [2018-10-27 15:35:09,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:35:09,825 INFO L225 Difference]: With dead ends: 463 [2018-10-27 15:35:09,825 INFO L226 Difference]: Without dead ends: 312 [2018-10-27 15:35:09,826 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 645 GetRequests, 543 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4867, Invalid=5845, Unknown=0, NotChecked=0, Total=10712 [2018-10-27 15:35:09,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2018-10-27 15:35:09,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 310. [2018-10-27 15:35:09,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 310 states. [2018-10-27 15:35:09,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 311 transitions. [2018-10-27 15:35:09,830 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 311 transitions. Word has length 297 [2018-10-27 15:35:09,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:35:09,830 INFO L481 AbstractCegarLoop]: Abstraction has 310 states and 311 transitions. [2018-10-27 15:35:09,830 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-27 15:35:09,830 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 311 transitions. [2018-10-27 15:35:09,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2018-10-27 15:35:09,832 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:35:09,832 INFO L375 BasicCegarLoop]: trace histogram [50, 50, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:35:09,832 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:35:09,833 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:35:09,833 INFO L82 PathProgramCache]: Analyzing trace with hash 842936503, now seen corresponding path program 48 times [2018-10-27 15:35:09,833 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:35:09,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:09,833 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:35:09,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:09,834 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:35:09,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:11,277 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 15:35:11,277 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:11,277 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:35:11,277 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:35:11,277 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:35:11,278 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:11,278 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 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:35:11,286 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:35:11,286 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:35:11,507 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:35:11,507 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:35:11,513 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:35:11,571 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 15:35:11,571 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:35:14,212 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 15:35:14,234 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:35:14,234 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 103 [2018-10-27 15:35:14,234 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:35:14,235 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-27 15:35:14,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-27 15:35:14,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5253, Invalid=5253, Unknown=0, NotChecked=0, Total=10506 [2018-10-27 15:35:14,236 INFO L87 Difference]: Start difference. First operand 310 states and 311 transitions. Second operand 53 states. [2018-10-27 15:35:14,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:35:14,918 INFO L93 Difference]: Finished difference Result 474 states and 477 transitions. [2018-10-27 15:35:14,919 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-27 15:35:14,919 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 309 [2018-10-27 15:35:14,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:35:14,920 INFO L225 Difference]: With dead ends: 474 [2018-10-27 15:35:14,920 INFO L226 Difference]: Without dead ends: 319 [2018-10-27 15:35:14,921 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 669 GetRequests, 568 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=5253, Invalid=5253, Unknown=0, NotChecked=0, Total=10506 [2018-10-27 15:35:14,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2018-10-27 15:35:14,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 313. [2018-10-27 15:35:14,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 313 states. [2018-10-27 15:35:14,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 314 transitions. [2018-10-27 15:35:14,926 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 314 transitions. Word has length 309 [2018-10-27 15:35:14,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:35:14,927 INFO L481 AbstractCegarLoop]: Abstraction has 313 states and 314 transitions. [2018-10-27 15:35:14,927 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-27 15:35:14,927 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 314 transitions. [2018-10-27 15:35:14,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 313 [2018-10-27 15:35:14,929 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:35:14,929 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 50, 50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:35:14,929 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:35:14,929 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:35:14,930 INFO L82 PathProgramCache]: Analyzing trace with hash 1692579666, now seen corresponding path program 49 times [2018-10-27 15:35:14,930 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:35:14,930 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:14,930 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:35:14,930 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:14,931 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:35:14,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:16,474 INFO L134 CoverageAnalysis]: Checked inductivity of 7401 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 15:35:16,474 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:16,474 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:35:16,474 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:35:16,474 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:35:16,474 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:16,475 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 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:35:16,482 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:35:16,483 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:35:16,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:16,715 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:35:16,772 INFO L134 CoverageAnalysis]: Checked inductivity of 7401 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 15:35:16,772 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:35:19,561 INFO L134 CoverageAnalysis]: Checked inductivity of 7401 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 15:35:19,581 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:35:19,582 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 105 [2018-10-27 15:35:19,582 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:35:19,582 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-27 15:35:19,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-27 15:35:19,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5460, Invalid=5460, Unknown=0, NotChecked=0, Total=10920 [2018-10-27 15:35:19,583 INFO L87 Difference]: Start difference. First operand 313 states and 314 transitions. Second operand 54 states. [2018-10-27 15:35:20,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:35:20,295 INFO L93 Difference]: Finished difference Result 481 states and 485 transitions. [2018-10-27 15:35:20,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-27 15:35:20,295 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 312 [2018-10-27 15:35:20,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:35:20,297 INFO L225 Difference]: With dead ends: 481 [2018-10-27 15:35:20,297 INFO L226 Difference]: Without dead ends: 326 [2018-10-27 15:35:20,298 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 676 GetRequests, 573 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=5460, Invalid=5460, Unknown=0, NotChecked=0, Total=10920 [2018-10-27 15:35:20,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2018-10-27 15:35:20,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 316. [2018-10-27 15:35:20,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2018-10-27 15:35:20,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 317 transitions. [2018-10-27 15:35:20,304 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 317 transitions. Word has length 312 [2018-10-27 15:35:20,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:35:20,304 INFO L481 AbstractCegarLoop]: Abstraction has 316 states and 317 transitions. [2018-10-27 15:35:20,304 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-27 15:35:20,304 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 317 transitions. [2018-10-27 15:35:20,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 316 [2018-10-27 15:35:20,306 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:35:20,307 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 51, 50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:35:20,307 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:35:20,307 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:35:20,307 INFO L82 PathProgramCache]: Analyzing trace with hash -1125194025, now seen corresponding path program 50 times [2018-10-27 15:35:20,307 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:35:20,308 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:20,308 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:35:20,308 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:20,308 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:35:20,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:21,545 INFO L134 CoverageAnalysis]: Checked inductivity of 7553 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 15:35:21,545 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:21,546 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:35:21,546 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:35:21,546 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:35:21,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:21,546 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 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:35:21,553 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:35:21,554 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:35:41,275 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2018-10-27 15:35:41,275 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:35:41,293 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:35:41,523 INFO L134 CoverageAnalysis]: Checked inductivity of 7553 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3927 trivial. 0 not checked. [2018-10-27 15:35:41,523 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:35:44,583 INFO L134 CoverageAnalysis]: Checked inductivity of 7553 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3927 trivial. 0 not checked. [2018-10-27 15:35:44,610 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:35:44,610 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 109 [2018-10-27 15:35:44,610 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:35:44,611 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-27 15:35:44,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-27 15:35:44,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5470, Invalid=6302, Unknown=0, NotChecked=0, Total=11772 [2018-10-27 15:35:44,612 INFO L87 Difference]: Start difference. First operand 316 states and 317 transitions. Second operand 57 states. [2018-10-27 15:35:45,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:35:45,239 INFO L93 Difference]: Finished difference Result 490 states and 495 transitions. [2018-10-27 15:35:45,239 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-27 15:35:45,239 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 315 [2018-10-27 15:35:45,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:35:45,241 INFO L225 Difference]: With dead ends: 490 [2018-10-27 15:35:45,241 INFO L226 Difference]: Without dead ends: 330 [2018-10-27 15:35:45,242 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 684 GetRequests, 576 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 563 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=5476, Invalid=6514, Unknown=0, NotChecked=0, Total=11990 [2018-10-27 15:35:45,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2018-10-27 15:35:45,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 328. [2018-10-27 15:35:45,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 328 states. [2018-10-27 15:35:45,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 329 transitions. [2018-10-27 15:35:45,247 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 329 transitions. Word has length 315 [2018-10-27 15:35:45,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:35:45,247 INFO L481 AbstractCegarLoop]: Abstraction has 328 states and 329 transitions. [2018-10-27 15:35:45,247 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-27 15:35:45,247 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 329 transitions. [2018-10-27 15:35:45,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2018-10-27 15:35:45,249 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:35:45,250 INFO L375 BasicCegarLoop]: trace histogram [53, 53, 52, 52, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:35:45,250 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:35:45,250 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:35:45,250 INFO L82 PathProgramCache]: Analyzing trace with hash 1516328116, now seen corresponding path program 51 times [2018-10-27 15:35:45,250 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:35:45,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:45,251 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:35:45,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:45,251 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:35:45,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:46,716 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-27 15:35:46,717 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:46,717 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:35:46,717 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:35:46,717 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:35:46,717 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:46,717 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 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:35:46,724 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:35:46,724 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:35:46,964 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:35:46,964 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:35:46,971 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:35:47,034 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-27 15:35:47,034 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:35:49,981 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-27 15:35:50,003 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:35:50,003 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 109 [2018-10-27 15:35:50,003 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:35:50,004 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-10-27 15:35:50,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-10-27 15:35:50,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5886, Invalid=5886, Unknown=0, NotChecked=0, Total=11772 [2018-10-27 15:35:50,005 INFO L87 Difference]: Start difference. First operand 328 states and 329 transitions. Second operand 56 states. [2018-10-27 15:35:50,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:35:50,784 INFO L93 Difference]: Finished difference Result 501 states and 504 transitions. [2018-10-27 15:35:50,784 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-27 15:35:50,784 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 327 [2018-10-27 15:35:50,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:35:50,785 INFO L225 Difference]: With dead ends: 501 [2018-10-27 15:35:50,785 INFO L226 Difference]: Without dead ends: 337 [2018-10-27 15:35:50,786 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 708 GetRequests, 601 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=5886, Invalid=5886, Unknown=0, NotChecked=0, Total=11772 [2018-10-27 15:35:50,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2018-10-27 15:35:50,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 331. [2018-10-27 15:35:50,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 331 states. [2018-10-27 15:35:50,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 332 transitions. [2018-10-27 15:35:50,790 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 332 transitions. Word has length 327 [2018-10-27 15:35:50,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:35:50,790 INFO L481 AbstractCegarLoop]: Abstraction has 331 states and 332 transitions. [2018-10-27 15:35:50,790 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-10-27 15:35:50,790 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 332 transitions. [2018-10-27 15:35:50,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2018-10-27 15:35:50,792 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:35:50,792 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 53, 53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:35:50,792 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:35:50,792 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:35:50,792 INFO L82 PathProgramCache]: Analyzing trace with hash 1633258127, now seen corresponding path program 52 times [2018-10-27 15:35:50,792 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:35:50,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:50,793 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:35:50,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:50,793 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:35:50,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:52,210 INFO L134 CoverageAnalysis]: Checked inductivity of 8322 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-27 15:35:52,210 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:52,210 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:35:52,211 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:35:52,211 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:35:52,211 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:52,211 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 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:35:52,221 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:35:52,221 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:35:52,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:52,465 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:35:52,559 INFO L134 CoverageAnalysis]: Checked inductivity of 8322 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-27 15:35:52,559 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:35:55,603 INFO L134 CoverageAnalysis]: Checked inductivity of 8322 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-27 15:35:55,624 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:35:55,625 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 111 [2018-10-27 15:35:55,625 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:35:55,625 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-27 15:35:55,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-27 15:35:55,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6105, Invalid=6105, Unknown=0, NotChecked=0, Total=12210 [2018-10-27 15:35:55,626 INFO L87 Difference]: Start difference. First operand 331 states and 332 transitions. Second operand 57 states. [2018-10-27 15:35:56,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:35:56,410 INFO L93 Difference]: Finished difference Result 508 states and 512 transitions. [2018-10-27 15:35:56,411 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-27 15:35:56,411 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 330 [2018-10-27 15:35:56,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:35:56,413 INFO L225 Difference]: With dead ends: 508 [2018-10-27 15:35:56,413 INFO L226 Difference]: Without dead ends: 344 [2018-10-27 15:35:56,414 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 715 GetRequests, 606 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=6105, Invalid=6105, Unknown=0, NotChecked=0, Total=12210 [2018-10-27 15:35:56,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2018-10-27 15:35:56,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 334. [2018-10-27 15:35:56,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 334 states. [2018-10-27 15:35:56,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 335 transitions. [2018-10-27 15:35:56,419 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 335 transitions. Word has length 330 [2018-10-27 15:35:56,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:35:56,419 INFO L481 AbstractCegarLoop]: Abstraction has 334 states and 335 transitions. [2018-10-27 15:35:56,419 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-27 15:35:56,419 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 335 transitions. [2018-10-27 15:35:56,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2018-10-27 15:35:56,421 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:35:56,421 INFO L375 BasicCegarLoop]: trace histogram [55, 54, 54, 53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:35:56,422 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:35:56,422 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:35:56,422 INFO L82 PathProgramCache]: Analyzing trace with hash 1876738772, now seen corresponding path program 53 times [2018-10-27 15:35:56,422 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:35:56,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:56,423 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:35:56,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:56,423 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:35:56,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:57,963 INFO L134 CoverageAnalysis]: Checked inductivity of 8483 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-27 15:35:57,964 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:57,964 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:35:57,964 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:35:57,964 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:35:57,964 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:57,964 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 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:35:57,972 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:35:57,972 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