java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf -i ../../../trunk/examples/svcomp/loop-invgen/up_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:34:58,466 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:34:58,470 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:34:58,482 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:34:58,482 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:34:58,483 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:34:58,485 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:34:58,487 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:34:58,489 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:34:58,490 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:34:58,490 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:34:58,491 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:34:58,492 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:34:58,493 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:34:58,494 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:34:58,495 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:34:58,496 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:34:58,498 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:34:58,500 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:34:58,502 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:34:58,503 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:34:58,504 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:34:58,507 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:34:58,508 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:34:58,508 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:34:58,509 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:34:58,510 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:34:58,511 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:34:58,512 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:34:58,513 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:34:58,513 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:34:58,514 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-24 12:34:58,517 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-24 12:34:58,545 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:34:58,545 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:34:58,546 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:34:58,546 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:34:58,546 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:34:58,547 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:34:58,547 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-24 12:34:58,547 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:34:58,547 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-24 12:34:58,548 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:34:58,548 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:34:58,548 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:34:58,548 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:34:58,548 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:34:58,550 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:34:58,550 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:34:58,550 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:34:58,550 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:34:58,550 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:34:58,551 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:34:58,551 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:34:58,551 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:34:58,551 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:34:58,551 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:34:58,552 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:34:58,554 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:34:58,554 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:34:58,554 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:34:58,554 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:34:58,554 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:34:58,554 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:34:58,555 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:34:58,555 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:34:58,555 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:34:58,555 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:34:58,556 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:34:58,604 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:34:58,623 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:34:58,628 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:34:58,629 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:34:58,630 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:34:58,630 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-invgen/up_true-unreach-call_true-termination.i [2018-10-24 12:34:58,696 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/65ed87934/295a41569d6a46cd972441b44df6a21d/FLAG8cc994cb1 [2018-10-24 12:34:59,151 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:34:59,151 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/up_true-unreach-call_true-termination.i [2018-10-24 12:34:59,158 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/65ed87934/295a41569d6a46cd972441b44df6a21d/FLAG8cc994cb1 [2018-10-24 12:34:59,183 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/65ed87934/295a41569d6a46cd972441b44df6a21d [2018-10-24 12:34:59,196 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:34:59,198 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:34:59,200 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:34:59,200 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:34:59,208 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:34:59,210 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:34:59" (1/1) ... [2018-10-24 12:34:59,214 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@49d99fce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:59, skipping insertion in model container [2018-10-24 12:34:59,214 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:34:59" (1/1) ... [2018-10-24 12:34:59,225 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:34:59,253 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:34:59,434 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:34:59,438 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:34:59,458 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:34:59,476 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:34:59,477 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:59 WrapperNode [2018-10-24 12:34:59,477 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:34:59,478 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:34:59,478 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:34:59,478 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:34:59,488 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:59" (1/1) ... [2018-10-24 12:34:59,494 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:59" (1/1) ... [2018-10-24 12:34:59,501 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:34:59,503 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:34:59,503 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:34:59,503 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:34:59,514 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:59" (1/1) ... [2018-10-24 12:34:59,514 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:59" (1/1) ... [2018-10-24 12:34:59,515 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:59" (1/1) ... [2018-10-24 12:34:59,515 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:59" (1/1) ... [2018-10-24 12:34:59,519 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:59" (1/1) ... [2018-10-24 12:34:59,527 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:59" (1/1) ... [2018-10-24 12:34:59,531 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:59" (1/1) ... [2018-10-24 12:34:59,532 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:34:59,533 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:34:59,533 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:34:59,533 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:34:59,534 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:59" (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 [2018-10-24 12:34:59,605 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:34:59,606 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:34:59,606 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:34:59,606 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:34:59,606 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:34:59,606 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:34:59,607 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:34:59,607 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:34:59,948 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:34:59,949 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:34:59 BoogieIcfgContainer [2018-10-24 12:34:59,949 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:34:59,950 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:34:59,951 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:34:59,954 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:34:59,954 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:34:59" (1/3) ... [2018-10-24 12:34:59,955 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40915a2b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:34:59, skipping insertion in model container [2018-10-24 12:34:59,955 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:59" (2/3) ... [2018-10-24 12:34:59,956 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40915a2b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:34:59, skipping insertion in model container [2018-10-24 12:34:59,956 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:34:59" (3/3) ... [2018-10-24 12:34:59,958 INFO L112 eAbstractionObserver]: Analyzing ICFG up_true-unreach-call_true-termination.i [2018-10-24 12:34:59,970 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:34:59,978 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:34:59,996 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:35:00,056 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:35:00,056 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:35:00,056 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:35:00,056 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:35:00,057 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:35:00,061 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:35:00,062 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:35:00,062 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:35:00,085 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-10-24 12:35:00,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 12:35:00,091 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:00,092 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:00,095 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:00,100 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:00,101 INFO L82 PathProgramCache]: Analyzing trace with hash -1884544245, now seen corresponding path program 1 times [2018-10-24 12:35:00,104 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:00,159 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:00,159 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:00,159 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:00,160 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:00,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:00,231 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:00,233 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:35:00,233 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:35:00,233 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:35:00,237 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:35:00,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:35:00,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:35:00,253 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2018-10-24 12:35:00,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:00,281 INFO L93 Difference]: Finished difference Result 37 states and 44 transitions. [2018-10-24 12:35:00,282 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:35:00,283 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-10-24 12:35:00,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:00,292 INFO L225 Difference]: With dead ends: 37 [2018-10-24 12:35:00,292 INFO L226 Difference]: Without dead ends: 18 [2018-10-24 12:35:00,296 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 [2018-10-24 12:35:00,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-24 12:35:00,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-24 12:35:00,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 12:35:00,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-10-24 12:35:00,335 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-10-24 12:35:00,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:00,336 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-10-24 12:35:00,336 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:35:00,336 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-10-24 12:35:00,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-24 12:35:00,337 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:00,337 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:00,338 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:00,338 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:00,338 INFO L82 PathProgramCache]: Analyzing trace with hash 1969781111, now seen corresponding path program 1 times [2018-10-24 12:35:00,338 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:00,339 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:00,340 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:00,340 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:00,340 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:00,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:00,619 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:00,619 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:35:00,619 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-24 12:35:00,620 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:35:00,621 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:35:00,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:35:00,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 12:35:00,623 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 5 states. [2018-10-24 12:35:00,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:00,790 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2018-10-24 12:35:00,790 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:35:00,790 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2018-10-24 12:35:00,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:00,792 INFO L225 Difference]: With dead ends: 33 [2018-10-24 12:35:00,792 INFO L226 Difference]: Without dead ends: 20 [2018-10-24 12:35:00,793 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:35:00,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-24 12:35:00,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-24 12:35:00,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-24 12:35:00,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2018-10-24 12:35:00,799 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 14 [2018-10-24 12:35:00,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:00,800 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2018-10-24 12:35:00,800 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:35:00,800 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2018-10-24 12:35:00,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-24 12:35:00,801 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:00,801 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:00,802 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:00,802 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:00,802 INFO L82 PathProgramCache]: Analyzing trace with hash -1960344783, now seen corresponding path program 1 times [2018-10-24 12:35:00,802 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:00,804 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:00,804 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:00,804 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:00,804 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:00,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:00,950 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:00,950 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:35:00,951 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-10-24 12:35:00,955 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:35:00,955 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:35:00,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:35:00,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:35:00,956 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 6 states. [2018-10-24 12:35:01,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:01,170 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2018-10-24 12:35:01,171 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:35:01,171 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2018-10-24 12:35:01,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:01,176 INFO L225 Difference]: With dead ends: 34 [2018-10-24 12:35:01,176 INFO L226 Difference]: Without dead ends: 32 [2018-10-24 12:35:01,177 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:35:01,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-24 12:35:01,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 27. [2018-10-24 12:35:01,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-24 12:35:01,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-10-24 12:35:01,193 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 16 [2018-10-24 12:35:01,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:01,194 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-10-24 12:35:01,194 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:35:01,194 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-10-24 12:35:01,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-24 12:35:01,195 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:01,195 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:01,195 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:01,196 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:01,196 INFO L82 PathProgramCache]: Analyzing trace with hash -1864992939, now seen corresponding path program 1 times [2018-10-24 12:35:01,196 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:01,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:01,197 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:01,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:01,197 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:01,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:01,493 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:01,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:01,493 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:01,494 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-10-24 12:35:01,496 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [18], [22], [28], [30], [35], [38], [40], [43], [45], [46], [47], [48], [50], [51] [2018-10-24 12:35:01,542 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:35:01,542 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:35:01,817 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:35:01,818 INFO L272 AbstractInterpreter]: Visited 19 different actions 79 times. Merged at 8 different actions 28 times. Widened at 1 different actions 3 times. Found 4 fixpoints after 3 different actions. Largest state had 9 variables. [2018-10-24 12:35:01,832 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:01,834 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:35:01,834 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:01,834 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 [2018-10-24 12:35:01,846 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:01,846 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:01,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:01,882 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:01,972 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:01,973 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:02,048 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:02,079 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:02,080 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2018-10-24 12:35:02,080 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:02,081 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:35:02,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:35:02,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:35:02,082 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2018-10-24 12:35:02,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:02,296 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2018-10-24 12:35:02,297 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:35:02,297 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2018-10-24 12:35:02,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:02,299 INFO L225 Difference]: With dead ends: 46 [2018-10-24 12:35:02,300 INFO L226 Difference]: Without dead ends: 29 [2018-10-24 12:35:02,301 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 43 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:35:02,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-24 12:35:02,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-10-24 12:35:02,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-24 12:35:02,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2018-10-24 12:35:02,308 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 24 [2018-10-24 12:35:02,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:02,308 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2018-10-24 12:35:02,308 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:35:02,309 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2018-10-24 12:35:02,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-24 12:35:02,310 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:02,310 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:02,310 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:02,310 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:02,311 INFO L82 PathProgramCache]: Analyzing trace with hash -62381937, now seen corresponding path program 2 times [2018-10-24 12:35:02,311 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:02,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:02,312 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:02,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:02,313 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:02,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:02,470 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:02,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:02,470 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:02,471 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:02,471 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:02,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:02,471 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 [2018-10-24 12:35:02,486 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:02,487 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:02,505 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:35:02,505 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:02,509 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:02,582 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:02,582 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:02,948 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:35:02,970 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:02,970 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 10 [2018-10-24 12:35:02,970 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:02,971 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:35:02,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:35:02,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:35:02,972 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 10 states. [2018-10-24 12:35:03,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:03,124 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2018-10-24 12:35:03,125 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:35:03,125 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2018-10-24 12:35:03,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:03,127 INFO L225 Difference]: With dead ends: 39 [2018-10-24 12:35:03,128 INFO L226 Difference]: Without dead ends: 37 [2018-10-24 12:35:03,128 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 49 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:35:03,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-24 12:35:03,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-10-24 12:35:03,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-24 12:35:03,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2018-10-24 12:35:03,135 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 26 [2018-10-24 12:35:03,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:03,136 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2018-10-24 12:35:03,136 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:35:03,136 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2018-10-24 12:35:03,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-24 12:35:03,137 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:03,137 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:03,138 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:03,138 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:03,138 INFO L82 PathProgramCache]: Analyzing trace with hash 1261098675, now seen corresponding path program 3 times [2018-10-24 12:35:03,138 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:03,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:03,139 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:03,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:03,140 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:03,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:03,344 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:35:03,344 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:03,345 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:03,345 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:03,345 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:03,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:03,346 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 [2018-10-24 12:35:03,357 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:03,357 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:03,391 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:03,392 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:03,394 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:03,495 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:35:03,496 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:03,626 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:35:03,648 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:03,648 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 12 [2018-10-24 12:35:03,648 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:03,648 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:35:03,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:35:03,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:35:03,649 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 12 states. [2018-10-24 12:35:03,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:03,807 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2018-10-24 12:35:03,808 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:35:03,808 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2018-10-24 12:35:03,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:03,809 INFO L225 Difference]: With dead ends: 60 [2018-10-24 12:35:03,809 INFO L226 Difference]: Without dead ends: 39 [2018-10-24 12:35:03,810 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 60 SyntacticMatches, 6 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=167, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:35:03,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-24 12:35:03,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-10-24 12:35:03,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-24 12:35:03,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-10-24 12:35:03,818 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 34 [2018-10-24 12:35:03,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:03,818 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-10-24 12:35:03,818 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:35:03,818 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-10-24 12:35:03,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-24 12:35:03,819 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:03,820 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:03,820 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:03,820 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:03,820 INFO L82 PathProgramCache]: Analyzing trace with hash -1825718419, now seen corresponding path program 4 times [2018-10-24 12:35:03,820 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:03,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:03,821 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:03,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:03,822 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:03,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:04,099 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 15 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-24 12:35:04,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:04,099 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:04,100 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:04,100 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:04,100 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:04,100 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 [2018-10-24 12:35:04,109 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:04,109 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:04,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:04,137 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:04,182 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:35:04,182 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:04,253 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:35:04,273 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:04,274 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 11 [2018-10-24 12:35:04,274 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:04,274 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:35:04,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:35:04,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:35:04,275 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 11 states. [2018-10-24 12:35:04,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:04,450 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-10-24 12:35:04,451 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:35:04,451 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 36 [2018-10-24 12:35:04,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:04,453 INFO L225 Difference]: With dead ends: 49 [2018-10-24 12:35:04,453 INFO L226 Difference]: Without dead ends: 47 [2018-10-24 12:35:04,454 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 7 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:35:04,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-10-24 12:35:04,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-10-24 12:35:04,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-24 12:35:04,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2018-10-24 12:35:04,461 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 36 [2018-10-24 12:35:04,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:04,461 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2018-10-24 12:35:04,461 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:35:04,461 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2018-10-24 12:35:04,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-24 12:35:04,462 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:04,462 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:04,463 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:04,463 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:04,463 INFO L82 PathProgramCache]: Analyzing trace with hash -51726447, now seen corresponding path program 5 times [2018-10-24 12:35:04,463 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:04,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:04,464 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:04,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:04,464 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:04,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:04,601 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:35:04,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:04,602 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:04,602 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:04,602 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:04,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:04,603 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 [2018-10-24 12:35:04,612 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:04,612 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:04,631 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 12:35:04,631 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:04,637 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:04,754 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:35:04,754 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:04,844 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:35:04,865 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:04,865 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 15 [2018-10-24 12:35:04,865 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:04,866 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:35:04,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:35:04,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:35:04,868 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 15 states. [2018-10-24 12:35:05,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:05,060 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2018-10-24 12:35:05,062 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:35:05,062 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2018-10-24 12:35:05,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:05,063 INFO L225 Difference]: With dead ends: 74 [2018-10-24 12:35:05,063 INFO L226 Difference]: Without dead ends: 49 [2018-10-24 12:35:05,064 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 77 SyntacticMatches, 8 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=271, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:35:05,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-24 12:35:05,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-10-24 12:35:05,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-10-24 12:35:05,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2018-10-24 12:35:05,072 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 44 [2018-10-24 12:35:05,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:05,072 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2018-10-24 12:35:05,072 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:35:05,073 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2018-10-24 12:35:05,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-24 12:35:05,074 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:05,074 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:05,074 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:05,075 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:05,075 INFO L82 PathProgramCache]: Analyzing trace with hash 446005195, now seen corresponding path program 6 times [2018-10-24 12:35:05,075 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:05,076 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:05,076 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:05,076 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:05,076 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:05,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:05,201 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 25 proven. 28 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-24 12:35:05,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:05,202 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:05,202 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:05,202 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:05,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:05,202 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 [2018-10-24 12:35:05,210 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:05,211 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:05,235 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:05,235 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:05,238 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:05,324 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:35:05,324 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:05,437 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:35:05,458 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:05,458 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 12 [2018-10-24 12:35:05,458 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:05,459 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:35:05,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:35:05,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:35:05,460 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 12 states. [2018-10-24 12:35:05,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:05,755 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2018-10-24 12:35:05,755 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:35:05,756 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 46 [2018-10-24 12:35:05,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:05,757 INFO L225 Difference]: With dead ends: 59 [2018-10-24 12:35:05,757 INFO L226 Difference]: Without dead ends: 57 [2018-10-24 12:35:05,758 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 87 SyntacticMatches, 9 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:35:05,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-24 12:35:05,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-10-24 12:35:05,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-24 12:35:05,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-10-24 12:35:05,766 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 46 [2018-10-24 12:35:05,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:05,766 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-10-24 12:35:05,767 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:35:05,767 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-10-24 12:35:05,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-10-24 12:35:05,768 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:05,768 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:05,768 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:05,768 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:05,769 INFO L82 PathProgramCache]: Analyzing trace with hash -239912465, now seen corresponding path program 7 times [2018-10-24 12:35:05,769 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:05,770 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:05,770 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:05,770 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:05,770 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:05,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:05,920 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:35:05,921 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:05,921 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:05,921 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:05,921 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:05,921 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:05,921 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 [2018-10-24 12:35:05,930 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:05,931 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:05,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:05,960 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:06,134 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:35:06,134 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:06,392 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:35:06,428 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:06,428 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 18 [2018-10-24 12:35:06,429 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:06,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:35:06,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:35:06,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:35:06,431 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 18 states. [2018-10-24 12:35:06,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:06,807 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2018-10-24 12:35:06,807 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:35:06,808 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 54 [2018-10-24 12:35:06,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:06,809 INFO L225 Difference]: With dead ends: 88 [2018-10-24 12:35:06,809 INFO L226 Difference]: Without dead ends: 59 [2018-10-24 12:35:06,810 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 94 SyntacticMatches, 10 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=152, Invalid=400, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:35:06,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-10-24 12:35:06,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-10-24 12:35:06,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-24 12:35:06,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2018-10-24 12:35:06,818 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 54 [2018-10-24 12:35:06,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:06,818 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2018-10-24 12:35:06,818 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:35:06,818 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2018-10-24 12:35:06,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-24 12:35:06,819 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:06,819 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:06,820 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:06,820 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:06,820 INFO L82 PathProgramCache]: Analyzing trace with hash -363560535, now seen corresponding path program 8 times [2018-10-24 12:35:06,820 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:06,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:06,821 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:06,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:06,822 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:06,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:06,967 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 37 proven. 46 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:35:06,968 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:06,968 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:06,968 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:06,968 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:06,968 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:06,968 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 [2018-10-24 12:35:06,979 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:06,979 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:07,071 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:35:07,071 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:07,077 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:07,127 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:35:07,128 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:07,301 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:35:07,322 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:07,322 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 13 [2018-10-24 12:35:07,322 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:07,323 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:35:07,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:35:07,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:35:07,323 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand 13 states. [2018-10-24 12:35:07,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:07,470 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2018-10-24 12:35:07,471 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:35:07,471 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 56 [2018-10-24 12:35:07,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:07,473 INFO L225 Difference]: With dead ends: 69 [2018-10-24 12:35:07,473 INFO L226 Difference]: Without dead ends: 67 [2018-10-24 12:35:07,474 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 106 SyntacticMatches, 11 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:35:07,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-24 12:35:07,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-10-24 12:35:07,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-10-24 12:35:07,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2018-10-24 12:35:07,482 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 56 [2018-10-24 12:35:07,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:07,482 INFO L481 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2018-10-24 12:35:07,483 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:35:07,483 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2018-10-24 12:35:07,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-24 12:35:07,484 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:07,484 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:07,484 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:07,485 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:07,485 INFO L82 PathProgramCache]: Analyzing trace with hash 1782152653, now seen corresponding path program 9 times [2018-10-24 12:35:07,485 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:07,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:07,486 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:07,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:07,486 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:07,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:07,730 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:07,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:07,731 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:07,731 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:07,731 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:07,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:07,731 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 [2018-10-24 12:35:07,739 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:07,740 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:07,788 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:07,788 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:07,792 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:08,223 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:08,223 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:08,349 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:08,369 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:08,369 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 21 [2018-10-24 12:35:08,369 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:08,370 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:35:08,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:35:08,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:35:08,371 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 21 states. [2018-10-24 12:35:08,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:08,831 INFO L93 Difference]: Finished difference Result 102 states and 109 transitions. [2018-10-24 12:35:08,831 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:35:08,832 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 64 [2018-10-24 12:35:08,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:08,833 INFO L225 Difference]: With dead ends: 102 [2018-10-24 12:35:08,833 INFO L226 Difference]: Without dead ends: 69 [2018-10-24 12:35:08,834 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 111 SyntacticMatches, 12 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=202, Invalid=554, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:35:08,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-24 12:35:08,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-10-24 12:35:08,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-24 12:35:08,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-10-24 12:35:08,845 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 64 [2018-10-24 12:35:08,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:08,846 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-10-24 12:35:08,846 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:35:08,846 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-10-24 12:35:08,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-10-24 12:35:08,847 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:08,848 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:08,848 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:08,848 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:08,848 INFO L82 PathProgramCache]: Analyzing trace with hash 1767367943, now seen corresponding path program 10 times [2018-10-24 12:35:08,848 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:08,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:08,849 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:08,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:08,853 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:08,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:09,013 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 51 proven. 68 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-24 12:35:09,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:09,013 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:09,013 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:09,014 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:09,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:09,014 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 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 [2018-10-24 12:35:09,024 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:09,024 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:09,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:09,064 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:09,118 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:09,118 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:09,358 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:09,380 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:09,380 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 14 [2018-10-24 12:35:09,380 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:09,381 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:35:09,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:35:09,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:35:09,382 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 14 states. [2018-10-24 12:35:09,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:09,613 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-10-24 12:35:09,613 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:35:09,613 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 66 [2018-10-24 12:35:09,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:09,614 INFO L225 Difference]: With dead ends: 79 [2018-10-24 12:35:09,614 INFO L226 Difference]: Without dead ends: 77 [2018-10-24 12:35:09,615 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 125 SyntacticMatches, 13 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:35:09,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-10-24 12:35:09,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2018-10-24 12:35:09,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-24 12:35:09,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2018-10-24 12:35:09,622 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 66 [2018-10-24 12:35:09,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:09,622 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2018-10-24 12:35:09,622 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:35:09,622 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2018-10-24 12:35:09,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-24 12:35:09,624 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:09,624 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:09,624 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:09,624 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:09,624 INFO L82 PathProgramCache]: Analyzing trace with hash 508207915, now seen corresponding path program 11 times [2018-10-24 12:35:09,625 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:09,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:09,626 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:09,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:09,626 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:09,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:09,938 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:09,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:09,939 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:09,939 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:09,939 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:09,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:09,939 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 [2018-10-24 12:35:09,947 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:09,947 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:09,979 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-24 12:35:09,979 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:09,984 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:10,216 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:10,216 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:10,417 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:10,438 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:10,438 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 24 [2018-10-24 12:35:10,439 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:10,439 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:35:10,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:35:10,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=409, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:35:10,440 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand 24 states. [2018-10-24 12:35:10,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:10,916 INFO L93 Difference]: Finished difference Result 116 states and 124 transitions. [2018-10-24 12:35:10,917 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:35:10,917 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 74 [2018-10-24 12:35:10,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:10,918 INFO L225 Difference]: With dead ends: 116 [2018-10-24 12:35:10,918 INFO L226 Difference]: Without dead ends: 79 [2018-10-24 12:35:10,919 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 128 SyntacticMatches, 14 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=259, Invalid=733, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:35:10,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-24 12:35:10,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-10-24 12:35:10,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-24 12:35:10,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-10-24 12:35:10,927 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 74 [2018-10-24 12:35:10,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:10,927 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-10-24 12:35:10,928 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:35:10,928 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-10-24 12:35:10,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-24 12:35:10,929 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:10,929 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:10,929 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:10,930 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:10,930 INFO L82 PathProgramCache]: Analyzing trace with hash 262457829, now seen corresponding path program 12 times [2018-10-24 12:35:10,930 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:10,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:10,931 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:10,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:10,931 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:10,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:11,092 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 67 proven. 94 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-24 12:35:11,093 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:11,093 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:11,093 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:11,093 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:11,093 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:11,093 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 [2018-10-24 12:35:11,101 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:11,101 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:11,128 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:11,128 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:11,132 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:11,169 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:11,169 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:11,304 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:11,326 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:11,326 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 15 [2018-10-24 12:35:11,326 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:11,327 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:35:11,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:35:11,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:35:11,328 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 15 states. [2018-10-24 12:35:11,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:11,531 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2018-10-24 12:35:11,531 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:35:11,531 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 76 [2018-10-24 12:35:11,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:11,533 INFO L225 Difference]: With dead ends: 89 [2018-10-24 12:35:11,533 INFO L226 Difference]: Without dead ends: 87 [2018-10-24 12:35:11,534 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 144 SyntacticMatches, 15 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:35:11,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-24 12:35:11,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-10-24 12:35:11,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-10-24 12:35:11,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-10-24 12:35:11,542 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 76 [2018-10-24 12:35:11,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:11,542 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-10-24 12:35:11,542 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:35:11,542 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-10-24 12:35:11,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-10-24 12:35:11,543 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:11,544 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:11,544 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:11,544 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:11,544 INFO L82 PathProgramCache]: Analyzing trace with hash 1053542921, now seen corresponding path program 13 times [2018-10-24 12:35:11,544 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:11,545 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:11,545 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:11,545 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:11,546 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:11,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:11,887 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:11,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:11,888 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:11,888 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:11,888 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:11,888 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:11,888 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 [2018-10-24 12:35:11,896 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:11,896 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:11,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:11,932 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:12,128 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:12,128 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:12,280 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:12,300 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:12,301 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 27 [2018-10-24 12:35:12,301 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:12,301 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:35:12,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:35:12,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=523, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:35:12,302 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 27 states. [2018-10-24 12:35:12,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:12,667 INFO L93 Difference]: Finished difference Result 130 states and 139 transitions. [2018-10-24 12:35:12,668 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:35:12,668 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 84 [2018-10-24 12:35:12,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:12,670 INFO L225 Difference]: With dead ends: 130 [2018-10-24 12:35:12,670 INFO L226 Difference]: Without dead ends: 89 [2018-10-24 12:35:12,671 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 145 SyntacticMatches, 16 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 415 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=323, Invalid=937, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:35:12,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-10-24 12:35:12,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2018-10-24 12:35:12,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-24 12:35:12,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 90 transitions. [2018-10-24 12:35:12,678 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 90 transitions. Word has length 84 [2018-10-24 12:35:12,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:12,678 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 90 transitions. [2018-10-24 12:35:12,678 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:35:12,679 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 90 transitions. [2018-10-24 12:35:12,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-10-24 12:35:12,680 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:12,680 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:12,680 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:12,680 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:12,681 INFO L82 PathProgramCache]: Analyzing trace with hash -396865469, now seen corresponding path program 14 times [2018-10-24 12:35:12,681 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:12,681 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:12,682 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:12,682 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:12,682 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:12,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:13,460 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 85 proven. 124 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-24 12:35:13,460 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:13,460 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:13,460 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:13,461 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:13,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:13,461 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 [2018-10-24 12:35:13,469 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:13,469 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:13,503 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:35:13,503 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:13,506 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:13,546 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:13,546 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:13,662 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:13,683 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:13,683 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 16 [2018-10-24 12:35:13,683 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:13,684 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:35:13,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:35:13,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:35:13,684 INFO L87 Difference]: Start difference. First operand 89 states and 90 transitions. Second operand 16 states. [2018-10-24 12:35:13,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:13,850 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2018-10-24 12:35:13,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:35:13,850 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 86 [2018-10-24 12:35:13,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:13,852 INFO L225 Difference]: With dead ends: 99 [2018-10-24 12:35:13,852 INFO L226 Difference]: Without dead ends: 97 [2018-10-24 12:35:13,853 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 163 SyntacticMatches, 17 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:35:13,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-10-24 12:35:13,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-10-24 12:35:13,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-10-24 12:35:13,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-10-24 12:35:13,859 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 86 [2018-10-24 12:35:13,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:13,860 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-10-24 12:35:13,860 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:35:13,860 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-10-24 12:35:13,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-10-24 12:35:13,861 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:13,861 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:13,861 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:13,862 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:13,862 INFO L82 PathProgramCache]: Analyzing trace with hash -138800537, now seen corresponding path program 15 times [2018-10-24 12:35:13,862 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:13,863 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:13,863 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:13,863 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:13,863 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:13,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:14,158 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:35:14,158 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:14,158 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:14,159 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:14,159 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:14,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:14,159 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-24 12:35:14,167 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:14,167 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:14,201 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:14,202 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:14,204 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:14,452 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:35:14,453 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:14,712 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:35:14,732 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:14,732 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 30 [2018-10-24 12:35:14,732 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:14,733 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:35:14,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:35:14,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=651, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:35:14,734 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 30 states. [2018-10-24 12:35:15,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:15,026 INFO L93 Difference]: Finished difference Result 144 states and 154 transitions. [2018-10-24 12:35:15,029 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:35:15,029 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 94 [2018-10-24 12:35:15,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:15,030 INFO L225 Difference]: With dead ends: 144 [2018-10-24 12:35:15,031 INFO L226 Difference]: Without dead ends: 99 [2018-10-24 12:35:15,032 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 162 SyntacticMatches, 18 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=394, Invalid=1166, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:35:15,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-10-24 12:35:15,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2018-10-24 12:35:15,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-24 12:35:15,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2018-10-24 12:35:15,039 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 94 [2018-10-24 12:35:15,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:15,040 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2018-10-24 12:35:15,040 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:35:15,040 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2018-10-24 12:35:15,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-24 12:35:15,041 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:15,041 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:15,041 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:15,042 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:15,042 INFO L82 PathProgramCache]: Analyzing trace with hash -1817733087, now seen corresponding path program 16 times [2018-10-24 12:35:15,042 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:15,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:15,043 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:15,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:15,043 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:15,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:15,353 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 105 proven. 158 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-24 12:35:15,354 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:15,354 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:15,354 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:15,354 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:15,354 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:15,354 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 [2018-10-24 12:35:15,362 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:15,362 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:15,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:15,393 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:15,470 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:35:15,470 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:15,582 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:35:15,603 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:15,603 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 17 [2018-10-24 12:35:15,603 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:15,603 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:35:15,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:35:15,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=194, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:35:15,604 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand 17 states. [2018-10-24 12:35:16,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:16,089 INFO L93 Difference]: Finished difference Result 109 states and 110 transitions. [2018-10-24 12:35:16,089 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:35:16,090 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 96 [2018-10-24 12:35:16,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:16,091 INFO L225 Difference]: With dead ends: 109 [2018-10-24 12:35:16,092 INFO L226 Difference]: Without dead ends: 107 [2018-10-24 12:35:16,093 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 182 SyntacticMatches, 19 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:35:16,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2018-10-24 12:35:16,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2018-10-24 12:35:16,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-10-24 12:35:16,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 108 transitions. [2018-10-24 12:35:16,099 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 108 transitions. Word has length 96 [2018-10-24 12:35:16,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:16,100 INFO L481 AbstractCegarLoop]: Abstraction has 107 states and 108 transitions. [2018-10-24 12:35:16,100 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:35:16,100 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 108 transitions. [2018-10-24 12:35:16,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-24 12:35:16,101 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:16,101 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:16,101 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:16,101 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:16,102 INFO L82 PathProgramCache]: Analyzing trace with hash 1915395141, now seen corresponding path program 17 times [2018-10-24 12:35:16,102 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:16,102 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:16,103 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:16,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:16,103 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:16,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:16,411 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:35:16,412 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:16,412 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:16,412 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:16,412 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:16,412 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:16,412 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 [2018-10-24 12:35:16,419 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:16,420 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:16,477 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 12:35:16,478 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:16,481 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:16,725 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:35:16,725 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:16,940 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:35:16,960 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:16,961 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 33 [2018-10-24 12:35:16,961 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:16,961 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:35:16,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:35:16,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=793, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:35:16,962 INFO L87 Difference]: Start difference. First operand 107 states and 108 transitions. Second operand 33 states. [2018-10-24 12:35:17,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:17,627 INFO L93 Difference]: Finished difference Result 158 states and 169 transitions. [2018-10-24 12:35:17,627 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:35:17,627 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 104 [2018-10-24 12:35:17,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:17,628 INFO L225 Difference]: With dead ends: 158 [2018-10-24 12:35:17,628 INFO L226 Difference]: Without dead ends: 109 [2018-10-24 12:35:17,629 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 179 SyntacticMatches, 20 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 659 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=472, Invalid=1420, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:35:17,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-10-24 12:35:17,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2018-10-24 12:35:17,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2018-10-24 12:35:17,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 110 transitions. [2018-10-24 12:35:17,637 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 110 transitions. Word has length 104 [2018-10-24 12:35:17,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:17,637 INFO L481 AbstractCegarLoop]: Abstraction has 109 states and 110 transitions. [2018-10-24 12:35:17,637 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:35:17,637 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 110 transitions. [2018-10-24 12:35:17,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2018-10-24 12:35:17,638 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:17,638 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:17,638 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:17,639 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:17,639 INFO L82 PathProgramCache]: Analyzing trace with hash -924860033, now seen corresponding path program 18 times [2018-10-24 12:35:17,639 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:17,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:17,640 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:17,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:17,640 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:17,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:17,930 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 127 proven. 196 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-24 12:35:17,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:17,930 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:17,931 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:17,931 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:17,931 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:17,931 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 [2018-10-24 12:35:17,939 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:17,939 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:17,974 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:17,974 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:17,977 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:18,047 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:35:18,048 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:18,311 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:35:18,334 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:18,334 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 18 [2018-10-24 12:35:18,334 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:18,334 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:35:18,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:35:18,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:35:18,335 INFO L87 Difference]: Start difference. First operand 109 states and 110 transitions. Second operand 18 states. [2018-10-24 12:35:18,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:18,549 INFO L93 Difference]: Finished difference Result 119 states and 120 transitions. [2018-10-24 12:35:18,549 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:35:18,549 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 106 [2018-10-24 12:35:18,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:18,551 INFO L225 Difference]: With dead ends: 119 [2018-10-24 12:35:18,551 INFO L226 Difference]: Without dead ends: 117 [2018-10-24 12:35:18,551 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 201 SyntacticMatches, 21 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:35:18,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-10-24 12:35:18,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2018-10-24 12:35:18,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-24 12:35:18,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 118 transitions. [2018-10-24 12:35:18,558 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 118 transitions. Word has length 106 [2018-10-24 12:35:18,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:18,558 INFO L481 AbstractCegarLoop]: Abstraction has 117 states and 118 transitions. [2018-10-24 12:35:18,559 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:35:18,559 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 118 transitions. [2018-10-24 12:35:18,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-10-24 12:35:18,560 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:18,560 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:18,560 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:18,560 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:18,560 INFO L82 PathProgramCache]: Analyzing trace with hash 1447724963, now seen corresponding path program 19 times [2018-10-24 12:35:18,561 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:18,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:18,561 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:18,562 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:18,562 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:18,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:19,805 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:35:19,806 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:19,806 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:19,806 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:19,806 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:19,806 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:19,806 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 [2018-10-24 12:35:19,818 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:19,819 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:19,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:19,857 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:20,510 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:35:20,511 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:20,960 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:35:20,981 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:20,981 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 36 [2018-10-24 12:35:20,981 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:20,982 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:35:20,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:35:20,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=949, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:35:20,983 INFO L87 Difference]: Start difference. First operand 117 states and 118 transitions. Second operand 36 states. [2018-10-24 12:35:21,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:21,630 INFO L93 Difference]: Finished difference Result 172 states and 184 transitions. [2018-10-24 12:35:21,635 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:35:21,635 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 114 [2018-10-24 12:35:21,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:21,636 INFO L225 Difference]: With dead ends: 172 [2018-10-24 12:35:21,636 INFO L226 Difference]: Without dead ends: 119 [2018-10-24 12:35:21,637 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 196 SyntacticMatches, 22 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 802 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=557, Invalid=1699, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:35:21,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2018-10-24 12:35:21,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2018-10-24 12:35:21,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-10-24 12:35:21,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 120 transitions. [2018-10-24 12:35:21,646 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 120 transitions. Word has length 114 [2018-10-24 12:35:21,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:21,646 INFO L481 AbstractCegarLoop]: Abstraction has 119 states and 120 transitions. [2018-10-24 12:35:21,647 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:35:21,647 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 120 transitions. [2018-10-24 12:35:21,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-24 12:35:21,648 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:21,648 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:21,648 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:21,648 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:21,649 INFO L82 PathProgramCache]: Analyzing trace with hash 1483074653, now seen corresponding path program 20 times [2018-10-24 12:35:21,649 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:21,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:21,650 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:21,650 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:21,650 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:21,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:21,905 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 151 proven. 238 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-24 12:35:21,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:21,906 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:21,906 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:21,906 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:21,906 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:21,906 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 [2018-10-24 12:35:21,914 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:21,915 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:21,976 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:35:21,976 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:21,979 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:22,027 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:35:22,028 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:22,336 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:35:22,357 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:22,357 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 19 [2018-10-24 12:35:22,357 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:22,358 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:35:22,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:35:22,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=239, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:35:22,358 INFO L87 Difference]: Start difference. First operand 119 states and 120 transitions. Second operand 19 states. [2018-10-24 12:35:22,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:22,539 INFO L93 Difference]: Finished difference Result 129 states and 130 transitions. [2018-10-24 12:35:22,539 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:35:22,540 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 116 [2018-10-24 12:35:22,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:22,541 INFO L225 Difference]: With dead ends: 129 [2018-10-24 12:35:22,542 INFO L226 Difference]: Without dead ends: 127 [2018-10-24 12:35:22,542 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 220 SyntacticMatches, 23 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=116, Invalid=304, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:35:22,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-24 12:35:22,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2018-10-24 12:35:22,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-10-24 12:35:22,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2018-10-24 12:35:22,549 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 116 [2018-10-24 12:35:22,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:22,550 INFO L481 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2018-10-24 12:35:22,550 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:35:22,550 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2018-10-24 12:35:22,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2018-10-24 12:35:22,551 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:22,551 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:22,551 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:22,551 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:22,551 INFO L82 PathProgramCache]: Analyzing trace with hash -849415039, now seen corresponding path program 21 times [2018-10-24 12:35:22,551 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:22,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:22,552 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:22,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:22,552 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:22,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:22,909 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:35:22,909 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:22,909 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:22,909 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:22,909 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:22,910 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:22,910 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 [2018-10-24 12:35:22,917 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:22,917 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:22,955 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:22,955 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:22,958 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:23,773 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:35:23,773 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:24,199 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:35:24,219 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:24,219 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 39 [2018-10-24 12:35:24,219 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:24,220 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:35:24,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:35:24,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=1119, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:35:24,221 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand 39 states. [2018-10-24 12:35:24,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:24,781 INFO L93 Difference]: Finished difference Result 186 states and 199 transitions. [2018-10-24 12:35:24,789 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:35:24,789 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 124 [2018-10-24 12:35:24,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:24,790 INFO L225 Difference]: With dead ends: 186 [2018-10-24 12:35:24,790 INFO L226 Difference]: Without dead ends: 129 [2018-10-24 12:35:24,793 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 213 SyntacticMatches, 24 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 959 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=649, Invalid=2003, Unknown=0, NotChecked=0, Total=2652 [2018-10-24 12:35:24,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-10-24 12:35:24,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2018-10-24 12:35:24,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-10-24 12:35:24,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 130 transitions. [2018-10-24 12:35:24,802 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 130 transitions. Word has length 124 [2018-10-24 12:35:24,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:24,802 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 130 transitions. [2018-10-24 12:35:24,802 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:35:24,802 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 130 transitions. [2018-10-24 12:35:24,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2018-10-24 12:35:24,803 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:24,803 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:24,804 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:24,804 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:24,804 INFO L82 PathProgramCache]: Analyzing trace with hash -1380501317, now seen corresponding path program 22 times [2018-10-24 12:35:24,804 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:24,805 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:24,805 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:24,805 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:24,805 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:24,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:25,044 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 177 proven. 284 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-24 12:35:25,044 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:25,044 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:25,044 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:25,044 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:25,044 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:25,044 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 [2018-10-24 12:35:25,052 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:25,052 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:25,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:25,089 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:25,187 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 178 proven. 253 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:35:25,188 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:25,350 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 178 proven. 253 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:35:25,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:25,372 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 20 [2018-10-24 12:35:25,372 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:25,372 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:35:25,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:35:25,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=263, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:35:25,373 INFO L87 Difference]: Start difference. First operand 129 states and 130 transitions. Second operand 20 states. [2018-10-24 12:35:25,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:25,580 INFO L93 Difference]: Finished difference Result 139 states and 140 transitions. [2018-10-24 12:35:25,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:35:25,581 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 126 [2018-10-24 12:35:25,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:25,583 INFO L225 Difference]: With dead ends: 139 [2018-10-24 12:35:25,583 INFO L226 Difference]: Without dead ends: 137 [2018-10-24 12:35:25,584 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 239 SyntacticMatches, 25 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=130, Invalid=332, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:35:25,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2018-10-24 12:35:25,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2018-10-24 12:35:25,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2018-10-24 12:35:25,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 138 transitions. [2018-10-24 12:35:25,591 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 138 transitions. Word has length 126 [2018-10-24 12:35:25,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:25,591 INFO L481 AbstractCegarLoop]: Abstraction has 137 states and 138 transitions. [2018-10-24 12:35:25,592 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:35:25,592 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 138 transitions. [2018-10-24 12:35:25,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-24 12:35:25,593 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:25,593 INFO L375 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:25,593 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:25,593 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:25,593 INFO L82 PathProgramCache]: Analyzing trace with hash 63242975, now seen corresponding path program 23 times [2018-10-24 12:35:25,594 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:25,594 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:25,594 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:25,594 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:25,595 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:25,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:26,085 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-24 12:35:26,085 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:26,086 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:26,086 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:26,086 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:26,086 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:26,086 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 [2018-10-24 12:35:26,093 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:26,093 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:26,145 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-10-24 12:35:26,145 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:26,149 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:26,583 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-24 12:35:26,584 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:26,857 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-24 12:35:26,878 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:26,878 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 42 [2018-10-24 12:35:26,878 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:26,879 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:35:26,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:35:26,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=1303, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:35:26,880 INFO L87 Difference]: Start difference. First operand 137 states and 138 transitions. Second operand 42 states. [2018-10-24 12:35:27,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:27,560 INFO L93 Difference]: Finished difference Result 200 states and 214 transitions. [2018-10-24 12:35:27,560 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:35:27,560 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 134 [2018-10-24 12:35:27,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:27,561 INFO L225 Difference]: With dead ends: 200 [2018-10-24 12:35:27,561 INFO L226 Difference]: Without dead ends: 139 [2018-10-24 12:35:27,563 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 230 SyntacticMatches, 26 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1130 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=748, Invalid=2332, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:35:27,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-24 12:35:27,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2018-10-24 12:35:27,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-10-24 12:35:27,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2018-10-24 12:35:27,571 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 134 [2018-10-24 12:35:27,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:27,571 INFO L481 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2018-10-24 12:35:27,571 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:35:27,571 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2018-10-24 12:35:27,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2018-10-24 12:35:27,572 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:27,572 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:27,572 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:27,573 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:27,573 INFO L82 PathProgramCache]: Analyzing trace with hash -781662567, now seen corresponding path program 24 times [2018-10-24 12:35:27,573 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:27,573 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:27,574 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:27,574 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:27,574 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:27,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:27,878 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 205 proven. 334 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-24 12:35:27,878 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:27,878 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:27,878 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:27,878 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:27,878 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:27,879 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 [2018-10-24 12:35:27,888 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:27,888 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:27,928 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:27,928 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:27,931 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:27,984 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 206 proven. 300 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-24 12:35:27,984 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:28,190 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 206 proven. 300 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-24 12:35:28,212 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:28,212 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 21 [2018-10-24 12:35:28,212 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:28,212 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:35:28,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:35:28,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=288, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:35:28,213 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand 21 states. [2018-10-24 12:35:28,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:28,714 INFO L93 Difference]: Finished difference Result 149 states and 150 transitions. [2018-10-24 12:35:28,714 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:35:28,714 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 136 [2018-10-24 12:35:28,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:28,716 INFO L225 Difference]: With dead ends: 149 [2018-10-24 12:35:28,716 INFO L226 Difference]: Without dead ends: 147 [2018-10-24 12:35:28,717 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 258 SyntacticMatches, 27 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=145, Invalid=361, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:35:28,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-10-24 12:35:28,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2018-10-24 12:35:28,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-10-24 12:35:28,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 148 transitions. [2018-10-24 12:35:28,725 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 148 transitions. Word has length 136 [2018-10-24 12:35:28,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:28,725 INFO L481 AbstractCegarLoop]: Abstraction has 147 states and 148 transitions. [2018-10-24 12:35:28,725 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:35:28,725 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 148 transitions. [2018-10-24 12:35:28,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2018-10-24 12:35:28,726 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:28,727 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:28,727 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:28,727 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:28,727 INFO L82 PathProgramCache]: Analyzing trace with hash 720491197, now seen corresponding path program 25 times [2018-10-24 12:35:28,727 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:28,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:28,728 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:28,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:28,728 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:28,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:29,873 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:35:29,873 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:29,874 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:29,874 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:29,874 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:29,874 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:29,874 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-24 12:35:29,882 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:29,882 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:29,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:29,926 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:30,324 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:35:30,324 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:30,637 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:35:30,659 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:30,659 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 45 [2018-10-24 12:35:30,660 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:30,660 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:35:30,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:35:30,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=479, Invalid=1501, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:35:30,661 INFO L87 Difference]: Start difference. First operand 147 states and 148 transitions. Second operand 45 states. [2018-10-24 12:35:32,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:32,932 INFO L93 Difference]: Finished difference Result 214 states and 229 transitions. [2018-10-24 12:35:32,932 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:35:32,932 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 144 [2018-10-24 12:35:32,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:32,933 INFO L225 Difference]: With dead ends: 214 [2018-10-24 12:35:32,933 INFO L226 Difference]: Without dead ends: 149 [2018-10-24 12:35:32,935 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 247 SyntacticMatches, 28 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1315 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=854, Invalid=2686, Unknown=0, NotChecked=0, Total=3540 [2018-10-24 12:35:32,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-10-24 12:35:32,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2018-10-24 12:35:32,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-10-24 12:35:32,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 150 transitions. [2018-10-24 12:35:32,943 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 150 transitions. Word has length 144 [2018-10-24 12:35:32,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:32,944 INFO L481 AbstractCegarLoop]: Abstraction has 149 states and 150 transitions. [2018-10-24 12:35:32,944 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:35:32,944 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 150 transitions. [2018-10-24 12:35:32,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-10-24 12:35:32,945 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:32,945 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:32,945 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:32,945 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:32,946 INFO L82 PathProgramCache]: Analyzing trace with hash -349719049, now seen corresponding path program 26 times [2018-10-24 12:35:32,946 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:32,946 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:32,946 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:32,946 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:32,947 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:32,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:33,258 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 235 proven. 388 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-24 12:35:33,258 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:33,259 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:33,259 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:33,259 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:33,259 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:33,259 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 [2018-10-24 12:35:33,267 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:33,267 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:33,399 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-24 12:35:33,399 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:33,403 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:33,512 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 236 proven. 351 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:35:33,513 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:33,850 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 236 proven. 351 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:35:33,870 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:33,871 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 22 [2018-10-24 12:35:33,871 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:33,871 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:35:33,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:35:33,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=314, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:35:33,872 INFO L87 Difference]: Start difference. First operand 149 states and 150 transitions. Second operand 22 states. [2018-10-24 12:35:34,688 WARN L179 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 9 DAG size of output: 7 [2018-10-24 12:35:34,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:34,786 INFO L93 Difference]: Finished difference Result 159 states and 160 transitions. [2018-10-24 12:35:34,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:35:34,787 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 146 [2018-10-24 12:35:34,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:34,788 INFO L225 Difference]: With dead ends: 159 [2018-10-24 12:35:34,788 INFO L226 Difference]: Without dead ends: 157 [2018-10-24 12:35:34,789 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 277 SyntacticMatches, 29 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=161, Invalid=391, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:35:34,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-24 12:35:34,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2018-10-24 12:35:34,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-10-24 12:35:34,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 158 transitions. [2018-10-24 12:35:34,804 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 158 transitions. Word has length 146 [2018-10-24 12:35:34,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:34,804 INFO L481 AbstractCegarLoop]: Abstraction has 157 states and 158 transitions. [2018-10-24 12:35:34,804 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:35:34,804 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 158 transitions. [2018-10-24 12:35:34,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2018-10-24 12:35:34,807 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:34,808 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:34,808 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:34,808 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:34,808 INFO L82 PathProgramCache]: Analyzing trace with hash -76381157, now seen corresponding path program 27 times [2018-10-24 12:35:34,808 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:34,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:34,809 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:34,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:34,809 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:34,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:35,681 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-24 12:35:35,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:35,681 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:35,682 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:35,682 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:35,682 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:35,682 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 [2018-10-24 12:35:35,691 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:35,692 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:35,742 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:35,743 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:35,747 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:36,373 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-24 12:35:36,373 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:36,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-24 12:35:36,971 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:36,972 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 48 [2018-10-24 12:35:36,972 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:36,972 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-24 12:35:36,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-24 12:35:36,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=543, Invalid=1713, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:35:36,974 INFO L87 Difference]: Start difference. First operand 157 states and 158 transitions. Second operand 48 states. [2018-10-24 12:35:37,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:37,469 INFO L93 Difference]: Finished difference Result 228 states and 244 transitions. [2018-10-24 12:35:37,469 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-24 12:35:37,469 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 154 [2018-10-24 12:35:37,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:37,470 INFO L225 Difference]: With dead ends: 228 [2018-10-24 12:35:37,470 INFO L226 Difference]: Without dead ends: 159 [2018-10-24 12:35:37,472 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 264 SyntacticMatches, 30 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1514 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=967, Invalid=3065, Unknown=0, NotChecked=0, Total=4032 [2018-10-24 12:35:37,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2018-10-24 12:35:37,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2018-10-24 12:35:37,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-10-24 12:35:37,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 160 transitions. [2018-10-24 12:35:37,482 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 160 transitions. Word has length 154 [2018-10-24 12:35:37,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:37,483 INFO L481 AbstractCegarLoop]: Abstraction has 159 states and 160 transitions. [2018-10-24 12:35:37,483 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-24 12:35:37,483 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 160 transitions. [2018-10-24 12:35:37,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-10-24 12:35:37,484 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:37,484 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:37,485 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:37,485 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:37,485 INFO L82 PathProgramCache]: Analyzing trace with hash 1136207573, now seen corresponding path program 28 times [2018-10-24 12:35:37,485 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:37,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:37,486 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:37,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:37,486 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:37,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:38,143 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 267 proven. 446 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-24 12:35:38,143 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:38,143 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:38,143 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:38,144 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:38,144 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:38,144 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 [2018-10-24 12:35:38,152 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:38,152 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:38,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:38,210 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:38,344 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 268 proven. 406 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-24 12:35:38,344 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:38,575 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 268 proven. 406 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-24 12:35:38,596 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:38,596 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 23 [2018-10-24 12:35:38,596 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:38,596 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:35:38,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:35:38,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=341, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:35:38,597 INFO L87 Difference]: Start difference. First operand 159 states and 160 transitions. Second operand 23 states. [2018-10-24 12:35:39,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:39,334 INFO L93 Difference]: Finished difference Result 169 states and 170 transitions. [2018-10-24 12:35:39,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:35:39,334 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 156 [2018-10-24 12:35:39,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:39,336 INFO L225 Difference]: With dead ends: 169 [2018-10-24 12:35:39,336 INFO L226 Difference]: Without dead ends: 167 [2018-10-24 12:35:39,337 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 296 SyntacticMatches, 31 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=178, Invalid=422, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:35:39,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2018-10-24 12:35:39,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 167. [2018-10-24 12:35:39,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:35:39,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 168 transitions. [2018-10-24 12:35:39,344 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 168 transitions. Word has length 156 [2018-10-24 12:35:39,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:39,345 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 168 transitions. [2018-10-24 12:35:39,345 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:35:39,345 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 168 transitions. [2018-10-24 12:35:39,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-10-24 12:35:39,346 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:39,346 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:39,346 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:39,346 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:39,347 INFO L82 PathProgramCache]: Analyzing trace with hash -1226033415, now seen corresponding path program 29 times [2018-10-24 12:35:39,347 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:39,347 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:39,347 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:39,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:39,348 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:39,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:40,142 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:35:40,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:40,143 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:40,143 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:40,143 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:40,143 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:40,143 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 [2018-10-24 12:35:40,151 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:40,152 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:40,398 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-24 12:35:40,398 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:40,403 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:41,074 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:35:41,074 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:41,706 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:35:41,727 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:41,727 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 51 [2018-10-24 12:35:41,728 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:41,728 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-24 12:35:41,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-24 12:35:41,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=611, Invalid=1939, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:35:41,730 INFO L87 Difference]: Start difference. First operand 167 states and 168 transitions. Second operand 51 states. [2018-10-24 12:35:42,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:42,807 INFO L93 Difference]: Finished difference Result 242 states and 259 transitions. [2018-10-24 12:35:42,809 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:35:42,809 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 164 [2018-10-24 12:35:42,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:42,810 INFO L225 Difference]: With dead ends: 242 [2018-10-24 12:35:42,810 INFO L226 Difference]: Without dead ends: 169 [2018-10-24 12:35:42,813 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 379 GetRequests, 281 SyntacticMatches, 32 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1727 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1087, Invalid=3469, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:35:42,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-10-24 12:35:42,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-10-24 12:35:42,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-10-24 12:35:42,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2018-10-24 12:35:42,822 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 164 [2018-10-24 12:35:42,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:42,822 INFO L481 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2018-10-24 12:35:42,823 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-24 12:35:42,823 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2018-10-24 12:35:42,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2018-10-24 12:35:42,824 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:42,824 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:42,824 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:42,824 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:42,825 INFO L82 PathProgramCache]: Analyzing trace with hash -956679885, now seen corresponding path program 30 times [2018-10-24 12:35:42,825 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:42,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:42,826 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:42,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:42,826 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:42,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:43,100 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 301 proven. 508 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-24 12:35:43,101 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:43,101 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:43,101 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:43,101 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:43,101 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:43,101 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 [2018-10-24 12:35:43,115 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:43,116 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:43,187 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:43,187 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:43,192 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:43,855 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 302 proven. 465 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:35:43,856 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:44,682 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 302 proven. 465 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:35:44,703 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:44,704 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 24 [2018-10-24 12:35:44,704 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:44,704 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:35:44,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:35:44,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=369, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:35:44,705 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand 24 states. [2018-10-24 12:35:44,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:44,972 INFO L93 Difference]: Finished difference Result 179 states and 180 transitions. [2018-10-24 12:35:44,973 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:35:44,973 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 166 [2018-10-24 12:35:44,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:44,975 INFO L225 Difference]: With dead ends: 179 [2018-10-24 12:35:44,976 INFO L226 Difference]: Without dead ends: 177 [2018-10-24 12:35:44,976 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 315 SyntacticMatches, 33 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 388 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=196, Invalid=454, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:35:44,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-10-24 12:35:44,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 177. [2018-10-24 12:35:44,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-10-24 12:35:44,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 178 transitions. [2018-10-24 12:35:44,985 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 178 transitions. Word has length 166 [2018-10-24 12:35:44,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:44,986 INFO L481 AbstractCegarLoop]: Abstraction has 177 states and 178 transitions. [2018-10-24 12:35:44,986 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:35:44,986 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 178 transitions. [2018-10-24 12:35:44,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-10-24 12:35:44,987 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:44,987 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:44,988 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:44,988 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:44,988 INFO L82 PathProgramCache]: Analyzing trace with hash -1441002665, now seen corresponding path program 31 times [2018-10-24 12:35:44,988 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:44,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:44,989 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:44,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:44,989 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:45,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:45,880 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-24 12:35:45,881 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:45,881 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:45,881 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:45,881 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:45,881 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:45,881 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 [2018-10-24 12:35:45,889 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:45,889 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:45,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:45,944 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:46,972 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-24 12:35:46,972 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:47,522 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-24 12:35:47,542 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:47,542 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 54 [2018-10-24 12:35:47,543 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:47,543 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-24 12:35:47,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-24 12:35:47,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=683, Invalid=2179, Unknown=0, NotChecked=0, Total=2862 [2018-10-24 12:35:47,545 INFO L87 Difference]: Start difference. First operand 177 states and 178 transitions. Second operand 54 states. [2018-10-24 12:35:48,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:48,709 INFO L93 Difference]: Finished difference Result 256 states and 274 transitions. [2018-10-24 12:35:48,709 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-24 12:35:48,709 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 174 [2018-10-24 12:35:48,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:48,711 INFO L225 Difference]: With dead ends: 256 [2018-10-24 12:35:48,711 INFO L226 Difference]: Without dead ends: 179 [2018-10-24 12:35:48,713 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 298 SyntacticMatches, 34 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1954 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1214, Invalid=3898, Unknown=0, NotChecked=0, Total=5112 [2018-10-24 12:35:48,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2018-10-24 12:35:48,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2018-10-24 12:35:48,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2018-10-24 12:35:48,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 180 transitions. [2018-10-24 12:35:48,722 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 180 transitions. Word has length 174 [2018-10-24 12:35:48,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:48,723 INFO L481 AbstractCegarLoop]: Abstraction has 179 states and 180 transitions. [2018-10-24 12:35:48,723 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-24 12:35:48,723 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 180 transitions. [2018-10-24 12:35:48,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-10-24 12:35:48,724 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:48,724 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:48,724 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:48,724 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:48,724 INFO L82 PathProgramCache]: Analyzing trace with hash 98569489, now seen corresponding path program 32 times [2018-10-24 12:35:48,725 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:48,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:48,725 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:48,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:48,725 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:48,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:49,116 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 337 proven. 574 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-24 12:35:49,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:49,116 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:49,117 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:49,117 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:49,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:49,117 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 [2018-10-24 12:35:49,124 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:49,124 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:49,193 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-24 12:35:49,193 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:49,197 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:49,281 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 338 proven. 528 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-24 12:35:49,281 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:49,660 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 338 proven. 528 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-24 12:35:49,681 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:49,681 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 25 [2018-10-24 12:35:49,681 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:49,681 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:35:49,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:35:49,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=398, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:35:49,682 INFO L87 Difference]: Start difference. First operand 179 states and 180 transitions. Second operand 25 states. [2018-10-24 12:35:50,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:50,511 INFO L93 Difference]: Finished difference Result 189 states and 190 transitions. [2018-10-24 12:35:50,511 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 12:35:50,511 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 176 [2018-10-24 12:35:50,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:50,513 INFO L225 Difference]: With dead ends: 189 [2018-10-24 12:35:50,513 INFO L226 Difference]: Without dead ends: 187 [2018-10-24 12:35:50,514 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 334 SyntacticMatches, 35 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 429 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=215, Invalid=487, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:35:50,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-24 12:35:50,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2018-10-24 12:35:50,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-10-24 12:35:50,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 188 transitions. [2018-10-24 12:35:50,523 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 188 transitions. Word has length 176 [2018-10-24 12:35:50,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:50,523 INFO L481 AbstractCegarLoop]: Abstraction has 187 states and 188 transitions. [2018-10-24 12:35:50,523 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:35:50,524 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 188 transitions. [2018-10-24 12:35:50,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2018-10-24 12:35:50,525 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:50,525 INFO L375 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:50,525 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:50,525 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:50,526 INFO L82 PathProgramCache]: Analyzing trace with hash 785850677, now seen corresponding path program 33 times [2018-10-24 12:35:50,526 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:50,526 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:50,526 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:50,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:50,527 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:50,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:51,145 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:35:51,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:51,145 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:51,146 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:51,146 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:51,146 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:51,146 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 [2018-10-24 12:35:51,154 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:51,154 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:51,212 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:51,212 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:51,217 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:52,394 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:35:52,394 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:52,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:35:52,867 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:52,867 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 57 [2018-10-24 12:35:52,867 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:52,868 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-24 12:35:52,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-24 12:35:52,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=759, Invalid=2433, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:35:52,869 INFO L87 Difference]: Start difference. First operand 187 states and 188 transitions. Second operand 57 states. [2018-10-24 12:35:53,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:53,998 INFO L93 Difference]: Finished difference Result 270 states and 289 transitions. [2018-10-24 12:35:54,005 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:35:54,005 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 184 [2018-10-24 12:35:54,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:54,006 INFO L225 Difference]: With dead ends: 270 [2018-10-24 12:35:54,006 INFO L226 Difference]: Without dead ends: 189 [2018-10-24 12:35:54,008 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 315 SyntacticMatches, 36 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2195 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1348, Invalid=4352, Unknown=0, NotChecked=0, Total=5700 [2018-10-24 12:35:54,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2018-10-24 12:35:54,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 189. [2018-10-24 12:35:54,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-10-24 12:35:54,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 190 transitions. [2018-10-24 12:35:54,018 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 190 transitions. Word has length 184 [2018-10-24 12:35:54,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:54,018 INFO L481 AbstractCegarLoop]: Abstraction has 189 states and 190 transitions. [2018-10-24 12:35:54,018 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-24 12:35:54,018 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 190 transitions. [2018-10-24 12:35:54,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-10-24 12:35:54,019 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:54,020 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:54,020 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:54,020 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:54,020 INFO L82 PathProgramCache]: Analyzing trace with hash -1200110993, now seen corresponding path program 34 times [2018-10-24 12:35:54,020 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:54,021 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:54,021 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:54,021 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:54,021 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:54,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:54,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 375 proven. 644 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-24 12:35:54,390 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:54,390 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:54,390 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:54,390 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:54,390 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:54,390 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 [2018-10-24 12:35:54,398 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:54,398 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:54,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:54,458 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:54,634 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 376 proven. 595 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:35:54,634 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:54,948 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 376 proven. 595 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:35:54,969 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:54,970 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 26 [2018-10-24 12:35:54,970 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:54,970 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:35:54,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:35:54,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=428, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:35:54,971 INFO L87 Difference]: Start difference. First operand 189 states and 190 transitions. Second operand 26 states. [2018-10-24 12:35:55,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:55,243 INFO L93 Difference]: Finished difference Result 199 states and 200 transitions. [2018-10-24 12:35:55,244 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:35:55,244 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 186 [2018-10-24 12:35:55,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:55,246 INFO L225 Difference]: With dead ends: 199 [2018-10-24 12:35:55,246 INFO L226 Difference]: Without dead ends: 197 [2018-10-24 12:35:55,247 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 353 SyntacticMatches, 37 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 472 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=235, Invalid=521, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:35:55,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-10-24 12:35:55,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 197. [2018-10-24 12:35:55,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2018-10-24 12:35:55,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 198 transitions. [2018-10-24 12:35:55,256 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 198 transitions. Word has length 186 [2018-10-24 12:35:55,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:55,256 INFO L481 AbstractCegarLoop]: Abstraction has 197 states and 198 transitions. [2018-10-24 12:35:55,257 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:35:55,257 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 198 transitions. [2018-10-24 12:35:55,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-10-24 12:35:55,258 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:55,258 INFO L375 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 19, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:55,258 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:55,259 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:55,259 INFO L82 PathProgramCache]: Analyzing trace with hash 772446355, now seen corresponding path program 35 times [2018-10-24 12:35:55,259 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:55,259 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:55,260 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:55,260 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:55,260 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:55,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:56,063 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-24 12:35:56,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:56,064 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:56,064 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:56,064 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:56,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:56,064 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 [2018-10-24 12:35:56,072 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:56,072 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:56,151 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-10-24 12:35:56,152 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:56,156 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:57,354 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-24 12:35:57,354 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:57,861 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-24 12:35:57,881 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:57,882 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 60 [2018-10-24 12:35:57,882 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:57,882 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-24 12:35:57,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-24 12:35:57,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=839, Invalid=2701, Unknown=0, NotChecked=0, Total=3540 [2018-10-24 12:35:57,883 INFO L87 Difference]: Start difference. First operand 197 states and 198 transitions. Second operand 60 states. [2018-10-24 12:35:59,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:59,128 INFO L93 Difference]: Finished difference Result 284 states and 304 transitions. [2018-10-24 12:35:59,128 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:35:59,128 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 194 [2018-10-24 12:35:59,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:59,129 INFO L225 Difference]: With dead ends: 284 [2018-10-24 12:35:59,129 INFO L226 Difference]: Without dead ends: 199 [2018-10-24 12:35:59,131 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 448 GetRequests, 332 SyntacticMatches, 38 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2450 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1489, Invalid=4831, Unknown=0, NotChecked=0, Total=6320 [2018-10-24 12:35:59,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-10-24 12:35:59,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 199. [2018-10-24 12:35:59,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2018-10-24 12:35:59,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 200 transitions. [2018-10-24 12:35:59,141 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 200 transitions. Word has length 194 [2018-10-24 12:35:59,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:59,142 INFO L481 AbstractCegarLoop]: Abstraction has 199 states and 200 transitions. [2018-10-24 12:35:59,142 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-24 12:35:59,142 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 200 transitions. [2018-10-24 12:35:59,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2018-10-24 12:35:59,143 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:59,143 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:59,143 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:59,143 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:59,143 INFO L82 PathProgramCache]: Analyzing trace with hash -1075414707, now seen corresponding path program 36 times [2018-10-24 12:35:59,144 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:59,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:59,144 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:59,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:59,144 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:59,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:59,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 415 proven. 718 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-24 12:35:59,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:59,561 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:59,561 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:59,561 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:59,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:59,561 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 [2018-10-24 12:35:59,569 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:59,569 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:59,624 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:59,624 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:59,628 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:59,717 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 416 proven. 666 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-24 12:35:59,717 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:00,080 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 416 proven. 666 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-24 12:36:00,100 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:00,101 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 27 [2018-10-24 12:36:00,101 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:00,101 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:36:00,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:36:00,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=459, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:36:00,102 INFO L87 Difference]: Start difference. First operand 199 states and 200 transitions. Second operand 27 states. [2018-10-24 12:36:00,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:00,344 INFO L93 Difference]: Finished difference Result 209 states and 210 transitions. [2018-10-24 12:36:00,344 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:36:00,344 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 196 [2018-10-24 12:36:00,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:00,347 INFO L225 Difference]: With dead ends: 209 [2018-10-24 12:36:00,347 INFO L226 Difference]: Without dead ends: 207 [2018-10-24 12:36:00,347 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 372 SyntacticMatches, 39 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=256, Invalid=556, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:36:00,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2018-10-24 12:36:00,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2018-10-24 12:36:00,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-10-24 12:36:00,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 208 transitions. [2018-10-24 12:36:00,357 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 208 transitions. Word has length 196 [2018-10-24 12:36:00,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:00,357 INFO L481 AbstractCegarLoop]: Abstraction has 207 states and 208 transitions. [2018-10-24 12:36:00,357 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:36:00,358 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 208 transitions. [2018-10-24 12:36:00,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-10-24 12:36:00,359 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:00,359 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:00,359 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:00,359 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:00,360 INFO L82 PathProgramCache]: Analyzing trace with hash 565940593, now seen corresponding path program 37 times [2018-10-24 12:36:00,360 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:00,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:00,361 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:00,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:00,361 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:00,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:01,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:36:01,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:01,271 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:01,271 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:01,271 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:01,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:01,271 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-24 12:36:01,278 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:01,279 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:01,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:01,341 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:02,389 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:36:02,390 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:02,940 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:36:02,960 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:02,960 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 63 [2018-10-24 12:36:02,961 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:02,961 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-10-24 12:36:02,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-10-24 12:36:02,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=923, Invalid=2983, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:36:02,962 INFO L87 Difference]: Start difference. First operand 207 states and 208 transitions. Second operand 63 states. [2018-10-24 12:36:04,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:04,262 INFO L93 Difference]: Finished difference Result 298 states and 319 transitions. [2018-10-24 12:36:04,263 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:36:04,263 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 204 [2018-10-24 12:36:04,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:04,265 INFO L225 Difference]: With dead ends: 298 [2018-10-24 12:36:04,265 INFO L226 Difference]: Without dead ends: 209 [2018-10-24 12:36:04,267 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 349 SyntacticMatches, 40 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2719 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1637, Invalid=5335, Unknown=0, NotChecked=0, Total=6972 [2018-10-24 12:36:04,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2018-10-24 12:36:04,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 209. [2018-10-24 12:36:04,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2018-10-24 12:36:04,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 210 transitions. [2018-10-24 12:36:04,277 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 210 transitions. Word has length 204 [2018-10-24 12:36:04,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:04,278 INFO L481 AbstractCegarLoop]: Abstraction has 209 states and 210 transitions. [2018-10-24 12:36:04,278 INFO L482 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-10-24 12:36:04,278 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 210 transitions. [2018-10-24 12:36:04,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-10-24 12:36:04,279 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:04,279 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:04,279 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:04,279 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:04,280 INFO L82 PathProgramCache]: Analyzing trace with hash -1469492821, now seen corresponding path program 38 times [2018-10-24 12:36:04,280 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:04,280 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:04,280 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:04,281 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:04,281 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:04,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:04,675 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 457 proven. 796 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-24 12:36:04,676 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:04,676 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:04,676 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:04,676 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:04,676 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:04,676 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 [2018-10-24 12:36:04,683 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:04,683 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:04,782 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-24 12:36:04,782 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:04,787 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:05,220 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 458 proven. 741 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:36:05,220 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:05,622 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 458 proven. 741 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:36:05,642 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:05,642 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 28 [2018-10-24 12:36:05,642 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:05,642 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:36:05,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:36:05,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=491, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:36:05,643 INFO L87 Difference]: Start difference. First operand 209 states and 210 transitions. Second operand 28 states. [2018-10-24 12:36:05,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:05,960 INFO L93 Difference]: Finished difference Result 219 states and 220 transitions. [2018-10-24 12:36:05,961 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:36:05,961 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 206 [2018-10-24 12:36:05,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:05,962 INFO L225 Difference]: With dead ends: 219 [2018-10-24 12:36:05,962 INFO L226 Difference]: Without dead ends: 217 [2018-10-24 12:36:05,963 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 391 SyntacticMatches, 41 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 564 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=278, Invalid=592, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:36:05,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2018-10-24 12:36:05,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 217. [2018-10-24 12:36:05,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2018-10-24 12:36:05,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 218 transitions. [2018-10-24 12:36:05,973 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 218 transitions. Word has length 206 [2018-10-24 12:36:05,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:05,974 INFO L481 AbstractCegarLoop]: Abstraction has 217 states and 218 transitions. [2018-10-24 12:36:05,974 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:36:05,974 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 218 transitions. [2018-10-24 12:36:05,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2018-10-24 12:36:05,975 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:05,975 INFO L375 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 21, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:05,975 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:05,976 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:05,976 INFO L82 PathProgramCache]: Analyzing trace with hash -1761137713, now seen corresponding path program 39 times [2018-10-24 12:36:05,976 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:05,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:05,977 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:05,977 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:05,977 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:05,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:06,833 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-24 12:36:06,833 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:06,833 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:06,833 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:06,833 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:06,833 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:06,833 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 [2018-10-24 12:36:06,841 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:06,841 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:06,904 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:06,904 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:06,908 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:07,864 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-24 12:36:07,864 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:08,460 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-24 12:36:08,489 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:08,489 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 66 [2018-10-24 12:36:08,489 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:08,490 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-10-24 12:36:08,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-10-24 12:36:08,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1011, Invalid=3279, Unknown=0, NotChecked=0, Total=4290 [2018-10-24 12:36:08,491 INFO L87 Difference]: Start difference. First operand 217 states and 218 transitions. Second operand 66 states. [2018-10-24 12:36:10,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:10,770 INFO L93 Difference]: Finished difference Result 312 states and 334 transitions. [2018-10-24 12:36:10,770 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-24 12:36:10,771 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 214 [2018-10-24 12:36:10,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:10,772 INFO L225 Difference]: With dead ends: 312 [2018-10-24 12:36:10,772 INFO L226 Difference]: Without dead ends: 219 [2018-10-24 12:36:10,773 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 366 SyntacticMatches, 42 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3002 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1792, Invalid=5864, Unknown=0, NotChecked=0, Total=7656 [2018-10-24 12:36:10,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-10-24 12:36:10,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2018-10-24 12:36:10,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2018-10-24 12:36:10,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 220 transitions. [2018-10-24 12:36:10,783 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 220 transitions. Word has length 214 [2018-10-24 12:36:10,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:10,784 INFO L481 AbstractCegarLoop]: Abstraction has 219 states and 220 transitions. [2018-10-24 12:36:10,784 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-10-24 12:36:10,784 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 220 transitions. [2018-10-24 12:36:10,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2018-10-24 12:36:10,785 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:10,785 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:10,786 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:10,786 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:10,786 INFO L82 PathProgramCache]: Analyzing trace with hash -1420465271, now seen corresponding path program 40 times [2018-10-24 12:36:10,786 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:10,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:10,787 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:10,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:10,787 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:10,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:11,170 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 501 proven. 878 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2018-10-24 12:36:11,170 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:11,171 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:11,171 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:11,171 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:11,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:11,171 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 [2018-10-24 12:36:11,179 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:11,179 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:11,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:11,246 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:11,330 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 502 proven. 820 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-24 12:36:11,330 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:11,805 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 502 proven. 820 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-24 12:36:11,826 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:11,826 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 29 [2018-10-24 12:36:11,827 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:11,827 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:36:11,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:36:11,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=524, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:36:11,828 INFO L87 Difference]: Start difference. First operand 219 states and 220 transitions. Second operand 29 states. [2018-10-24 12:36:12,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:12,201 INFO L93 Difference]: Finished difference Result 229 states and 230 transitions. [2018-10-24 12:36:12,202 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:36:12,202 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 216 [2018-10-24 12:36:12,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:12,203 INFO L225 Difference]: With dead ends: 229 [2018-10-24 12:36:12,203 INFO L226 Difference]: Without dead ends: 227 [2018-10-24 12:36:12,204 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 410 SyntacticMatches, 43 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 613 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=301, Invalid=629, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:36:12,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2018-10-24 12:36:12,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 227. [2018-10-24 12:36:12,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 227 states. [2018-10-24 12:36:12,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 228 transitions. [2018-10-24 12:36:12,214 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 228 transitions. Word has length 216 [2018-10-24 12:36:12,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:12,215 INFO L481 AbstractCegarLoop]: Abstraction has 227 states and 228 transitions. [2018-10-24 12:36:12,215 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:36:12,215 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 228 transitions. [2018-10-24 12:36:12,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2018-10-24 12:36:12,216 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:12,216 INFO L375 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:12,217 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:12,217 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:12,217 INFO L82 PathProgramCache]: Analyzing trace with hash 807569325, now seen corresponding path program 41 times [2018-10-24 12:36:12,217 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:12,218 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:12,218 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:12,218 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:12,218 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:12,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:13,117 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:36:13,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:13,118 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:13,118 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:13,118 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:13,118 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:13,118 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) [2018-10-24 12:36:13,135 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:13,135 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:13,277 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-10-24 12:36:13,277 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:13,281 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:14,119 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:36:14,119 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:14,792 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:36:14,813 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:14,813 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 69 [2018-10-24 12:36:14,813 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:14,814 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-10-24 12:36:14,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-10-24 12:36:14,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1103, Invalid=3589, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:36:14,815 INFO L87 Difference]: Start difference. First operand 227 states and 228 transitions. Second operand 69 states. [2018-10-24 12:36:16,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:16,551 INFO L93 Difference]: Finished difference Result 326 states and 349 transitions. [2018-10-24 12:36:16,551 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:36:16,551 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 224 [2018-10-24 12:36:16,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:16,553 INFO L225 Difference]: With dead ends: 326 [2018-10-24 12:36:16,553 INFO L226 Difference]: Without dead ends: 229 [2018-10-24 12:36:16,554 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 383 SyntacticMatches, 44 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3299 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1954, Invalid=6418, Unknown=0, NotChecked=0, Total=8372 [2018-10-24 12:36:16,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2018-10-24 12:36:16,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 229. [2018-10-24 12:36:16,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2018-10-24 12:36:16,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 230 transitions. [2018-10-24 12:36:16,563 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 230 transitions. Word has length 224 [2018-10-24 12:36:16,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:16,564 INFO L481 AbstractCegarLoop]: Abstraction has 229 states and 230 transitions. [2018-10-24 12:36:16,564 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-10-24 12:36:16,564 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 230 transitions. [2018-10-24 12:36:16,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2018-10-24 12:36:16,565 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:16,566 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:16,566 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:16,566 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:16,566 INFO L82 PathProgramCache]: Analyzing trace with hash 823650023, now seen corresponding path program 42 times [2018-10-24 12:36:16,566 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:16,567 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:16,567 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:16,567 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:16,567 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:16,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:17,897 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 547 proven. 964 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2018-10-24 12:36:17,897 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:17,897 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:17,897 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:17,897 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:17,898 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:17,898 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 [2018-10-24 12:36:17,906 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:17,907 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:17,975 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:17,975 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:17,979 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:18,078 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 548 proven. 903 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:36:18,078 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:18,537 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 548 proven. 903 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:36:18,559 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:18,559 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27] total 30 [2018-10-24 12:36:18,559 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:18,560 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:36:18,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:36:18,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=558, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:36:18,560 INFO L87 Difference]: Start difference. First operand 229 states and 230 transitions. Second operand 30 states. [2018-10-24 12:36:18,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:18,855 INFO L93 Difference]: Finished difference Result 239 states and 240 transitions. [2018-10-24 12:36:18,856 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:36:18,856 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 226 [2018-10-24 12:36:18,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:18,858 INFO L225 Difference]: With dead ends: 239 [2018-10-24 12:36:18,858 INFO L226 Difference]: Without dead ends: 237 [2018-10-24 12:36:18,859 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 429 SyntacticMatches, 45 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 664 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=325, Invalid=667, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:36:18,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2018-10-24 12:36:18,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 237. [2018-10-24 12:36:18,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 237 states. [2018-10-24 12:36:18,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 238 transitions. [2018-10-24 12:36:18,869 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 238 transitions. Word has length 226 [2018-10-24 12:36:18,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:18,870 INFO L481 AbstractCegarLoop]: Abstraction has 237 states and 238 transitions. [2018-10-24 12:36:18,870 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:36:18,870 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 238 transitions. [2018-10-24 12:36:18,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2018-10-24 12:36:18,871 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:18,872 INFO L375 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 23, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:18,872 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:18,872 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:18,872 INFO L82 PathProgramCache]: Analyzing trace with hash 643482891, now seen corresponding path program 43 times [2018-10-24 12:36:18,872 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:18,873 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:18,873 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:18,873 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:18,873 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:18,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:19,905 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-24 12:36:19,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:19,906 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:19,906 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:19,906 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:19,906 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:19,906 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 [2018-10-24 12:36:19,916 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:19,916 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:19,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:19,987 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:20,944 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-24 12:36:20,945 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:21,750 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-24 12:36:21,770 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:21,770 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 72 [2018-10-24 12:36:21,771 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:21,771 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-10-24 12:36:21,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-10-24 12:36:21,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1199, Invalid=3913, Unknown=0, NotChecked=0, Total=5112 [2018-10-24 12:36:21,773 INFO L87 Difference]: Start difference. First operand 237 states and 238 transitions. Second operand 72 states. [2018-10-24 12:36:23,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:23,261 INFO L93 Difference]: Finished difference Result 340 states and 364 transitions. [2018-10-24 12:36:23,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-24 12:36:23,261 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 234 [2018-10-24 12:36:23,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:23,263 INFO L225 Difference]: With dead ends: 340 [2018-10-24 12:36:23,263 INFO L226 Difference]: Without dead ends: 239 [2018-10-24 12:36:23,264 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 540 GetRequests, 400 SyntacticMatches, 46 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3610 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2123, Invalid=6997, Unknown=0, NotChecked=0, Total=9120 [2018-10-24 12:36:23,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2018-10-24 12:36:23,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 239. [2018-10-24 12:36:23,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2018-10-24 12:36:23,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 240 transitions. [2018-10-24 12:36:23,275 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 240 transitions. Word has length 234 [2018-10-24 12:36:23,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:23,276 INFO L481 AbstractCegarLoop]: Abstraction has 239 states and 240 transitions. [2018-10-24 12:36:23,276 INFO L482 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-10-24 12:36:23,276 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 240 transitions. [2018-10-24 12:36:23,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2018-10-24 12:36:23,277 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:23,278 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:23,278 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:23,278 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:23,278 INFO L82 PathProgramCache]: Analyzing trace with hash -751443003, now seen corresponding path program 44 times [2018-10-24 12:36:23,278 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:23,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:23,279 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:23,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:23,279 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:23,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:24,344 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 595 proven. 1054 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-24 12:36:24,344 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:24,344 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:24,345 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:24,345 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:24,345 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:24,345 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 [2018-10-24 12:36:24,352 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:24,352 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:24,450 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-24 12:36:24,450 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:24,454 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:25,256 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 596 proven. 990 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-24 12:36:25,256 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:26,301 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 596 proven. 990 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-24 12:36:26,322 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:26,322 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 31 [2018-10-24 12:36:26,322 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:26,323 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:36:26,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:36:26,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=593, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:36:26,323 INFO L87 Difference]: Start difference. First operand 239 states and 240 transitions. Second operand 31 states. [2018-10-24 12:36:26,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:26,636 INFO L93 Difference]: Finished difference Result 249 states and 250 transitions. [2018-10-24 12:36:26,637 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-24 12:36:26,637 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 236 [2018-10-24 12:36:26,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:26,639 INFO L225 Difference]: With dead ends: 249 [2018-10-24 12:36:26,640 INFO L226 Difference]: Without dead ends: 247 [2018-10-24 12:36:26,640 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 448 SyntacticMatches, 47 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 717 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=350, Invalid=706, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:36:26,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-10-24 12:36:26,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 247. [2018-10-24 12:36:26,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2018-10-24 12:36:26,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 248 transitions. [2018-10-24 12:36:26,651 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 248 transitions. Word has length 236 [2018-10-24 12:36:26,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:26,651 INFO L481 AbstractCegarLoop]: Abstraction has 247 states and 248 transitions. [2018-10-24 12:36:26,651 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:36:26,652 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 248 transitions. [2018-10-24 12:36:26,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2018-10-24 12:36:26,653 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:26,653 INFO L375 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 24, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:26,653 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:26,654 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:26,654 INFO L82 PathProgramCache]: Analyzing trace with hash 1276445673, now seen corresponding path program 45 times [2018-10-24 12:36:26,654 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:26,655 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:26,655 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:26,655 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:26,655 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:26,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:28,087 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:36:28,087 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:28,087 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:28,087 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:28,087 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:28,088 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:28,088 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 [2018-10-24 12:36:28,096 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:28,096 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:28,168 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:28,169 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:28,173 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:29,184 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:36:29,185 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:30,206 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:36:30,226 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:30,226 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 75 [2018-10-24 12:36:30,226 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:30,227 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-10-24 12:36:30,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-10-24 12:36:30,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1299, Invalid=4251, Unknown=0, NotChecked=0, Total=5550 [2018-10-24 12:36:30,228 INFO L87 Difference]: Start difference. First operand 247 states and 248 transitions. Second operand 75 states. [2018-10-24 12:36:31,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:31,728 INFO L93 Difference]: Finished difference Result 354 states and 379 transitions. [2018-10-24 12:36:31,728 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-24 12:36:31,728 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 244 [2018-10-24 12:36:31,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:31,729 INFO L225 Difference]: With dead ends: 354 [2018-10-24 12:36:31,729 INFO L226 Difference]: Without dead ends: 249 [2018-10-24 12:36:31,731 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 563 GetRequests, 417 SyntacticMatches, 48 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3935 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2299, Invalid=7601, Unknown=0, NotChecked=0, Total=9900 [2018-10-24 12:36:31,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2018-10-24 12:36:31,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 249. [2018-10-24 12:36:31,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 249 states. [2018-10-24 12:36:31,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 250 transitions. [2018-10-24 12:36:31,744 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 250 transitions. Word has length 244 [2018-10-24 12:36:31,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:31,745 INFO L481 AbstractCegarLoop]: Abstraction has 249 states and 250 transitions. [2018-10-24 12:36:31,745 INFO L482 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-10-24 12:36:31,745 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 250 transitions. [2018-10-24 12:36:31,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2018-10-24 12:36:31,746 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:31,746 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:31,747 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:31,747 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:31,747 INFO L82 PathProgramCache]: Analyzing trace with hash -565411293, now seen corresponding path program 46 times [2018-10-24 12:36:31,747 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:31,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:31,748 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:31,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:31,748 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:31,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:32,421 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 645 proven. 1148 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2018-10-24 12:36:32,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:32,422 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:32,422 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:32,422 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:32,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:32,422 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 [2018-10-24 12:36:32,429 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:32,430 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:32,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:32,502 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:32,591 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 646 proven. 1081 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:36:32,592 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:33,274 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 646 proven. 1081 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:36:33,294 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:33,295 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 32 [2018-10-24 12:36:33,295 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:33,295 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:36:33,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:36:33,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=629, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:36:33,296 INFO L87 Difference]: Start difference. First operand 249 states and 250 transitions. Second operand 32 states. [2018-10-24 12:36:33,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:33,601 INFO L93 Difference]: Finished difference Result 259 states and 260 transitions. [2018-10-24 12:36:33,601 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:36:33,601 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 246 [2018-10-24 12:36:33,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:33,603 INFO L225 Difference]: With dead ends: 259 [2018-10-24 12:36:33,603 INFO L226 Difference]: Without dead ends: 257 [2018-10-24 12:36:33,604 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 467 SyntacticMatches, 49 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 772 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=376, Invalid=746, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:36:33,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2018-10-24 12:36:33,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 257. [2018-10-24 12:36:33,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 257 states. [2018-10-24 12:36:33,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 258 transitions. [2018-10-24 12:36:33,615 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 258 transitions. Word has length 246 [2018-10-24 12:36:33,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:33,616 INFO L481 AbstractCegarLoop]: Abstraction has 257 states and 258 transitions. [2018-10-24 12:36:33,616 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:36:33,616 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 258 transitions. [2018-10-24 12:36:33,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2018-10-24 12:36:33,617 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:33,617 INFO L375 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 25, 24, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:33,618 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:33,618 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:33,618 INFO L82 PathProgramCache]: Analyzing trace with hash -1899076537, now seen corresponding path program 47 times [2018-10-24 12:36:33,618 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:33,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:33,619 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:33,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:33,619 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:33,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:34,632 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-24 12:36:34,632 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:34,632 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:34,633 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:34,633 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:34,633 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:34,633 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-24 12:36:34,640 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:34,640 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:34,735 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-10-24 12:36:34,735 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:34,739 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:35,811 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-24 12:36:35,811 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:36,713 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-24 12:36:36,752 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:36,753 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 78 [2018-10-24 12:36:36,753 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:36,753 INFO L460 AbstractCegarLoop]: Interpolant automaton has 78 states [2018-10-24 12:36:36,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2018-10-24 12:36:36,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1403, Invalid=4603, Unknown=0, NotChecked=0, Total=6006 [2018-10-24 12:36:36,755 INFO L87 Difference]: Start difference. First operand 257 states and 258 transitions. Second operand 78 states. [2018-10-24 12:36:39,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:39,379 INFO L93 Difference]: Finished difference Result 368 states and 394 transitions. [2018-10-24 12:36:39,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-24 12:36:39,379 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 254 [2018-10-24 12:36:39,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:39,380 INFO L225 Difference]: With dead ends: 368 [2018-10-24 12:36:39,381 INFO L226 Difference]: Without dead ends: 259 [2018-10-24 12:36:39,382 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 434 SyntacticMatches, 50 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4274 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2482, Invalid=8230, Unknown=0, NotChecked=0, Total=10712 [2018-10-24 12:36:39,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2018-10-24 12:36:39,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 259. [2018-10-24 12:36:39,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2018-10-24 12:36:39,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 260 transitions. [2018-10-24 12:36:39,394 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 260 transitions. Word has length 254 [2018-10-24 12:36:39,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:39,395 INFO L481 AbstractCegarLoop]: Abstraction has 259 states and 260 transitions. [2018-10-24 12:36:39,395 INFO L482 AbstractCegarLoop]: Interpolant automaton has 78 states. [2018-10-24 12:36:39,395 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 260 transitions. [2018-10-24 12:36:39,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 257 [2018-10-24 12:36:39,397 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:39,397 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:39,397 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:39,397 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:39,397 INFO L82 PathProgramCache]: Analyzing trace with hash 1410392577, now seen corresponding path program 48 times [2018-10-24 12:36:39,397 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:39,398 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:39,398 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:39,398 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:39,398 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:39,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:39,904 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 697 proven. 1246 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2018-10-24 12:36:39,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:39,905 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:39,905 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:39,905 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:39,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:39,905 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 [2018-10-24 12:36:39,913 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:39,913 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:39,988 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:39,989 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:39,993 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:40,327 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 698 proven. 1176 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-24 12:36:40,328 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:40,937 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 698 proven. 1176 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-24 12:36:40,959 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:40,959 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 33 [2018-10-24 12:36:40,959 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:40,960 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:36:40,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:36:40,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=390, Invalid=666, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:36:40,960 INFO L87 Difference]: Start difference. First operand 259 states and 260 transitions. Second operand 33 states. [2018-10-24 12:36:41,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:41,331 INFO L93 Difference]: Finished difference Result 269 states and 270 transitions. [2018-10-24 12:36:41,331 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:36:41,332 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 256 [2018-10-24 12:36:41,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:41,334 INFO L225 Difference]: With dead ends: 269 [2018-10-24 12:36:41,334 INFO L226 Difference]: Without dead ends: 267 [2018-10-24 12:36:41,334 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 486 SyntacticMatches, 51 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 829 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=403, Invalid=787, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:36:41,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2018-10-24 12:36:41,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 267. [2018-10-24 12:36:41,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 267 states. [2018-10-24 12:36:41,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 268 transitions. [2018-10-24 12:36:41,347 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 268 transitions. Word has length 256 [2018-10-24 12:36:41,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:41,347 INFO L481 AbstractCegarLoop]: Abstraction has 267 states and 268 transitions. [2018-10-24 12:36:41,347 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:36:41,347 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 268 transitions. [2018-10-24 12:36:41,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2018-10-24 12:36:41,349 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:41,349 INFO L375 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 26, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:41,350 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:41,350 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:41,350 INFO L82 PathProgramCache]: Analyzing trace with hash -115603931, now seen corresponding path program 49 times [2018-10-24 12:36:41,350 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:41,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:41,351 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:41,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:41,351 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:41,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:42,655 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:36:42,655 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:42,655 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:42,655 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:42,655 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:42,655 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:42,655 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 [2018-10-24 12:36:42,664 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:42,664 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:42,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:42,740 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:44,076 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:36:44,076 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:45,012 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:36:45,032 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:45,032 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 81 [2018-10-24 12:36:45,032 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:45,032 INFO L460 AbstractCegarLoop]: Interpolant automaton has 81 states [2018-10-24 12:36:45,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2018-10-24 12:36:45,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1511, Invalid=4969, Unknown=0, NotChecked=0, Total=6480 [2018-10-24 12:36:45,033 INFO L87 Difference]: Start difference. First operand 267 states and 268 transitions. Second operand 81 states. [2018-10-24 12:36:47,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:47,034 INFO L93 Difference]: Finished difference Result 382 states and 409 transitions. [2018-10-24 12:36:47,042 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-24 12:36:47,042 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 264 [2018-10-24 12:36:47,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:47,044 INFO L225 Difference]: With dead ends: 382 [2018-10-24 12:36:47,044 INFO L226 Difference]: Without dead ends: 269 [2018-10-24 12:36:47,045 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 609 GetRequests, 451 SyntacticMatches, 52 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4627 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=2672, Invalid=8884, Unknown=0, NotChecked=0, Total=11556 [2018-10-24 12:36:47,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2018-10-24 12:36:47,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 269. [2018-10-24 12:36:47,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2018-10-24 12:36:47,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 270 transitions. [2018-10-24 12:36:47,057 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 270 transitions. Word has length 264 [2018-10-24 12:36:47,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:47,057 INFO L481 AbstractCegarLoop]: Abstraction has 269 states and 270 transitions. [2018-10-24 12:36:47,057 INFO L482 AbstractCegarLoop]: Interpolant automaton has 81 states. [2018-10-24 12:36:47,057 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 270 transitions. [2018-10-24 12:36:47,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2018-10-24 12:36:47,059 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:47,059 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:47,059 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:47,060 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:47,060 INFO L82 PathProgramCache]: Analyzing trace with hash 1833968479, now seen corresponding path program 50 times [2018-10-24 12:36:47,060 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:47,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:47,061 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:47,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:47,061 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:47,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:48,202 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 751 proven. 1348 refuted. 0 times theorem prover too weak. 1128 trivial. 0 not checked. [2018-10-24 12:36:48,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:48,202 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:48,202 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:48,202 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:48,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:48,203 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 [2018-10-24 12:36:48,211 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:48,211 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:48,313 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-24 12:36:48,314 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:48,318 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:48,418 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 752 proven. 1275 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:36:48,418 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:49,257 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 752 proven. 1275 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:36:49,277 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:49,278 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 34 [2018-10-24 12:36:49,278 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:49,278 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:36:49,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:36:49,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=418, Invalid=704, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:36:49,279 INFO L87 Difference]: Start difference. First operand 269 states and 270 transitions. Second operand 34 states. [2018-10-24 12:36:49,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:49,639 INFO L93 Difference]: Finished difference Result 279 states and 280 transitions. [2018-10-24 12:36:49,640 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-24 12:36:49,640 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 266 [2018-10-24 12:36:49,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:49,642 INFO L225 Difference]: With dead ends: 279 [2018-10-24 12:36:49,642 INFO L226 Difference]: Without dead ends: 277 [2018-10-24 12:36:49,643 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 505 SyntacticMatches, 53 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 888 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=431, Invalid=829, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:36:49,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2018-10-24 12:36:49,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 277. [2018-10-24 12:36:49,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 277 states. [2018-10-24 12:36:49,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 278 transitions. [2018-10-24 12:36:49,656 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 278 transitions. Word has length 266 [2018-10-24 12:36:49,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:49,656 INFO L481 AbstractCegarLoop]: Abstraction has 277 states and 278 transitions. [2018-10-24 12:36:49,656 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:36:49,656 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 278 transitions. [2018-10-24 12:36:49,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2018-10-24 12:36:49,658 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:49,658 INFO L375 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 27, 26, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:49,658 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:49,659 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:49,659 INFO L82 PathProgramCache]: Analyzing trace with hash 883624323, now seen corresponding path program 51 times [2018-10-24 12:36:49,659 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:49,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:49,660 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:49,660 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:49,660 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:49,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:50,865 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-24 12:36:50,865 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:50,865 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:50,865 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:50,866 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:50,866 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:50,866 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 [2018-10-24 12:36:50,873 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:50,874 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:50,954 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:50,954 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:50,960 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:52,260 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-24 12:36:52,260 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:53,573 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-24 12:36:53,593 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:53,593 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 84 [2018-10-24 12:36:53,593 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:53,594 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2018-10-24 12:36:53,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2018-10-24 12:36:53,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1623, Invalid=5349, Unknown=0, NotChecked=0, Total=6972 [2018-10-24 12:36:53,595 INFO L87 Difference]: Start difference. First operand 277 states and 278 transitions. Second operand 84 states. [2018-10-24 12:36:54,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:54,921 INFO L93 Difference]: Finished difference Result 396 states and 424 transitions. [2018-10-24 12:36:54,921 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-10-24 12:36:54,922 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 274 [2018-10-24 12:36:54,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:54,923 INFO L225 Difference]: With dead ends: 396 [2018-10-24 12:36:54,923 INFO L226 Difference]: Without dead ends: 279 [2018-10-24 12:36:54,925 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 632 GetRequests, 468 SyntacticMatches, 54 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4994 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=2869, Invalid=9563, Unknown=0, NotChecked=0, Total=12432 [2018-10-24 12:36:54,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2018-10-24 12:36:54,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 279. [2018-10-24 12:36:54,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 279 states. [2018-10-24 12:36:54,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 280 transitions. [2018-10-24 12:36:54,934 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 280 transitions. Word has length 274 [2018-10-24 12:36:54,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:54,935 INFO L481 AbstractCegarLoop]: Abstraction has 279 states and 280 transitions. [2018-10-24 12:36:54,935 INFO L482 AbstractCegarLoop]: Interpolant automaton has 84 states. [2018-10-24 12:36:54,935 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 280 transitions. [2018-10-24 12:36:54,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2018-10-24 12:36:54,936 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:54,937 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:54,937 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:54,937 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:54,937 INFO L82 PathProgramCache]: Analyzing trace with hash -1678809539, now seen corresponding path program 52 times [2018-10-24 12:36:54,937 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:54,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:54,938 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:54,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:54,938 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:54,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:55,507 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 807 proven. 1454 refuted. 0 times theorem prover too weak. 1225 trivial. 0 not checked. [2018-10-24 12:36:55,507 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:55,507 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:55,507 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:55,508 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:55,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:55,508 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 [2018-10-24 12:36:55,519 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:55,519 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:55,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:55,604 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:55,709 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 808 proven. 1378 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-24 12:36:55,710 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:56,347 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 808 proven. 1378 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-24 12:36:56,368 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:56,368 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 35 [2018-10-24 12:36:56,368 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:56,369 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 12:36:56,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 12:36:56,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=447, Invalid=743, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:36:56,369 INFO L87 Difference]: Start difference. First operand 279 states and 280 transitions. Second operand 35 states. [2018-10-24 12:36:56,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:56,765 INFO L93 Difference]: Finished difference Result 289 states and 290 transitions. [2018-10-24 12:36:56,765 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:36:56,765 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 276 [2018-10-24 12:36:56,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:56,768 INFO L225 Difference]: With dead ends: 289 [2018-10-24 12:36:56,768 INFO L226 Difference]: Without dead ends: 287 [2018-10-24 12:36:56,768 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 614 GetRequests, 524 SyntacticMatches, 55 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 949 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=460, Invalid=872, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:36:56,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2018-10-24 12:36:56,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 287. [2018-10-24 12:36:56,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2018-10-24 12:36:56,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 288 transitions. [2018-10-24 12:36:56,780 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 288 transitions. Word has length 276 [2018-10-24 12:36:56,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:56,780 INFO L481 AbstractCegarLoop]: Abstraction has 287 states and 288 transitions. [2018-10-24 12:36:56,780 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 12:36:56,780 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 288 transitions. [2018-10-24 12:36:56,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2018-10-24 12:36:56,782 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:56,782 INFO L375 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 28, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:56,783 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:56,783 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:56,783 INFO L82 PathProgramCache]: Analyzing trace with hash -1941926303, now seen corresponding path program 53 times [2018-10-24 12:36:56,783 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:56,784 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:56,784 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:56,784 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:56,784 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:56,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:58,048 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:36:58,048 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:58,048 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:58,048 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:58,048 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:58,048 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:58,048 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 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 [2018-10-24 12:36:58,059 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:58,059 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:58,187 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-10-24 12:36:58,187 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:58,193 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:59,663 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:36:59,663 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:00,745 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:37:00,765 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:00,765 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 87 [2018-10-24 12:37:00,765 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:00,766 INFO L460 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-10-24 12:37:00,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-10-24 12:37:00,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1739, Invalid=5743, Unknown=0, NotChecked=0, Total=7482 [2018-10-24 12:37:00,767 INFO L87 Difference]: Start difference. First operand 287 states and 288 transitions. Second operand 87 states. [2018-10-24 12:37:02,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:02,075 INFO L93 Difference]: Finished difference Result 410 states and 439 transitions. [2018-10-24 12:37:02,075 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-24 12:37:02,075 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 284 [2018-10-24 12:37:02,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:02,076 INFO L225 Difference]: With dead ends: 410 [2018-10-24 12:37:02,076 INFO L226 Difference]: Without dead ends: 289 [2018-10-24 12:37:02,078 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 655 GetRequests, 485 SyntacticMatches, 56 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5375 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=3073, Invalid=10267, Unknown=0, NotChecked=0, Total=13340 [2018-10-24 12:37:02,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2018-10-24 12:37:02,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2018-10-24 12:37:02,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 289 states. [2018-10-24 12:37:02,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 290 transitions. [2018-10-24 12:37:02,091 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 290 transitions. Word has length 284 [2018-10-24 12:37:02,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:02,091 INFO L481 AbstractCegarLoop]: Abstraction has 289 states and 290 transitions. [2018-10-24 12:37:02,091 INFO L482 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-10-24 12:37:02,091 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 290 transitions. [2018-10-24 12:37:02,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2018-10-24 12:37:02,093 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:02,093 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 28, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:02,093 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:02,094 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:02,094 INFO L82 PathProgramCache]: Analyzing trace with hash 216779419, now seen corresponding path program 54 times [2018-10-24 12:37:02,094 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:02,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:02,095 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:02,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:02,095 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:02,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:02,811 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 865 proven. 1564 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2018-10-24 12:37:02,811 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:02,811 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:02,811 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:02,811 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:02,811 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:02,812 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 [2018-10-24 12:37:02,820 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:37:02,820 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:37:02,896 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:37:02,896 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:02,901 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:03,018 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 866 proven. 1485 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:37:03,018 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:03,977 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 866 proven. 1485 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:37:03,998 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:03,998 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33] total 36 [2018-10-24 12:37:03,998 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:03,998 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:37:03,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:37:03,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=783, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:37:03,999 INFO L87 Difference]: Start difference. First operand 289 states and 290 transitions. Second operand 36 states. [2018-10-24 12:37:04,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:04,342 INFO L93 Difference]: Finished difference Result 299 states and 300 transitions. [2018-10-24 12:37:04,343 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:37:04,343 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 286 [2018-10-24 12:37:04,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:04,345 INFO L225 Difference]: With dead ends: 299 [2018-10-24 12:37:04,345 INFO L226 Difference]: Without dead ends: 297 [2018-10-24 12:37:04,345 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 636 GetRequests, 543 SyntacticMatches, 57 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1012 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=490, Invalid=916, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:37:04,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2018-10-24 12:37:04,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 297. [2018-10-24 12:37:04,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 297 states. [2018-10-24 12:37:04,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 298 transitions. [2018-10-24 12:37:04,357 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 298 transitions. Word has length 286 [2018-10-24 12:37:04,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:04,358 INFO L481 AbstractCegarLoop]: Abstraction has 297 states and 298 transitions. [2018-10-24 12:37:04,358 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:37:04,358 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 298 transitions. [2018-10-24 12:37:04,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2018-10-24 12:37:04,360 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:04,360 INFO L375 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 29, 28, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:04,360 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:04,360 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:04,361 INFO L82 PathProgramCache]: Analyzing trace with hash 1840886975, now seen corresponding path program 55 times [2018-10-24 12:37:04,361 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:04,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:04,361 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:04,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:04,362 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:04,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:05,677 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-24 12:37:05,678 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:05,678 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:05,678 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:05,678 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:05,678 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:05,678 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 [2018-10-24 12:37:05,685 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:05,685 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:37:05,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:05,773 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:07,175 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-24 12:37:07,176 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:08,600 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-24 12:37:08,620 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:08,620 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 90 [2018-10-24 12:37:08,620 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:08,621 INFO L460 AbstractCegarLoop]: Interpolant automaton has 90 states [2018-10-24 12:37:08,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2018-10-24 12:37:08,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1859, Invalid=6151, Unknown=0, NotChecked=0, Total=8010 [2018-10-24 12:37:08,622 INFO L87 Difference]: Start difference. First operand 297 states and 298 transitions. Second operand 90 states. [2018-10-24 12:37:10,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:10,530 INFO L93 Difference]: Finished difference Result 424 states and 454 transitions. [2018-10-24 12:37:10,530 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-24 12:37:10,531 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 294 [2018-10-24 12:37:10,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:10,532 INFO L225 Difference]: With dead ends: 424 [2018-10-24 12:37:10,532 INFO L226 Difference]: Without dead ends: 299 [2018-10-24 12:37:10,533 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 678 GetRequests, 502 SyntacticMatches, 58 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5770 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=3284, Invalid=10996, Unknown=0, NotChecked=0, Total=14280 [2018-10-24 12:37:10,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2018-10-24 12:37:10,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 299. [2018-10-24 12:37:10,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 299 states. [2018-10-24 12:37:10,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 300 transitions. [2018-10-24 12:37:10,545 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 300 transitions. Word has length 294 [2018-10-24 12:37:10,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:10,545 INFO L481 AbstractCegarLoop]: Abstraction has 299 states and 300 transitions. [2018-10-24 12:37:10,545 INFO L482 AbstractCegarLoop]: Interpolant automaton has 90 states. [2018-10-24 12:37:10,545 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 300 transitions. [2018-10-24 12:37:10,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2018-10-24 12:37:10,547 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:10,547 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:10,547 INFO L424 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:10,548 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:10,548 INFO L82 PathProgramCache]: Analyzing trace with hash -1436913543, now seen corresponding path program 56 times [2018-10-24 12:37:10,548 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:10,548 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:10,549 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:10,549 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:10,549 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:10,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:11,201 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 925 proven. 1678 refuted. 0 times theorem prover too weak. 1431 trivial. 0 not checked. [2018-10-24 12:37:11,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:11,202 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:11,202 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:11,202 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:11,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:11,202 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 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:11,212 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:37:11,212 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:37:11,334 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-24 12:37:11,335 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:11,339 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:11,448 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 926 proven. 1596 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-24 12:37:11,449 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:12,240 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 926 proven. 1596 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-24 12:37:12,261 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:12,262 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 37 [2018-10-24 12:37:12,262 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:12,262 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-24 12:37:12,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-24 12:37:12,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=508, Invalid=824, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:37:12,263 INFO L87 Difference]: Start difference. First operand 299 states and 300 transitions. Second operand 37 states. [2018-10-24 12:37:12,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:12,690 INFO L93 Difference]: Finished difference Result 309 states and 310 transitions. [2018-10-24 12:37:12,690 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-24 12:37:12,691 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 296 [2018-10-24 12:37:12,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:12,693 INFO L225 Difference]: With dead ends: 309 [2018-10-24 12:37:12,693 INFO L226 Difference]: Without dead ends: 307 [2018-10-24 12:37:12,693 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 658 GetRequests, 562 SyntacticMatches, 59 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1077 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=521, Invalid=961, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:37:12,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2018-10-24 12:37:12,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 307. [2018-10-24 12:37:12,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 307 states. [2018-10-24 12:37:12,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 308 transitions. [2018-10-24 12:37:12,702 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 308 transitions. Word has length 296 [2018-10-24 12:37:12,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:12,703 INFO L481 AbstractCegarLoop]: Abstraction has 307 states and 308 transitions. [2018-10-24 12:37:12,703 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-24 12:37:12,703 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 308 transitions. [2018-10-24 12:37:12,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2018-10-24 12:37:12,704 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:12,704 INFO L375 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 30, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:12,704 INFO L424 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:12,705 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:12,705 INFO L82 PathProgramCache]: Analyzing trace with hash 1812700317, now seen corresponding path program 57 times [2018-10-24 12:37:12,705 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:12,705 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:12,705 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:12,705 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:12,706 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:12,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:14,193 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:37:14,194 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:14,194 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:14,194 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:14,194 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:14,194 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:14,194 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 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:14,204 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:37:14,204 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:37:14,294 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:37:14,294 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:14,299 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:15,803 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:37:15,803 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:17,007 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:37:17,027 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:17,028 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 93 [2018-10-24 12:37:17,028 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:17,029 INFO L460 AbstractCegarLoop]: Interpolant automaton has 93 states [2018-10-24 12:37:17,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2018-10-24 12:37:17,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1983, Invalid=6573, Unknown=0, NotChecked=0, Total=8556 [2018-10-24 12:37:17,030 INFO L87 Difference]: Start difference. First operand 307 states and 308 transitions. Second operand 93 states. [2018-10-24 12:37:19,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:19,175 INFO L93 Difference]: Finished difference Result 438 states and 469 transitions. [2018-10-24 12:37:19,176 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-24 12:37:19,176 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 304 [2018-10-24 12:37:19,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:19,177 INFO L225 Difference]: With dead ends: 438 [2018-10-24 12:37:19,177 INFO L226 Difference]: Without dead ends: 309 [2018-10-24 12:37:19,179 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 701 GetRequests, 519 SyntacticMatches, 60 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6179 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=3502, Invalid=11750, Unknown=0, NotChecked=0, Total=15252 [2018-10-24 12:37:19,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2018-10-24 12:37:19,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 309. [2018-10-24 12:37:19,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 309 states. [2018-10-24 12:37:19,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 310 transitions. [2018-10-24 12:37:19,194 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 310 transitions. Word has length 304 [2018-10-24 12:37:19,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:19,194 INFO L481 AbstractCegarLoop]: Abstraction has 309 states and 310 transitions. [2018-10-24 12:37:19,194 INFO L482 AbstractCegarLoop]: Interpolant automaton has 93 states. [2018-10-24 12:37:19,194 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 310 transitions. [2018-10-24 12:37:19,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2018-10-24 12:37:19,196 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:19,196 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 30, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:19,196 INFO L424 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:19,196 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:19,197 INFO L82 PathProgramCache]: Analyzing trace with hash -1654097961, now seen corresponding path program 58 times [2018-10-24 12:37:19,197 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:19,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:19,197 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:19,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:19,198 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:19,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:19,771 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 987 proven. 1796 refuted. 0 times theorem prover too weak. 1540 trivial. 0 not checked. [2018-10-24 12:37:19,772 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:19,772 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:19,772 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:19,772 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:19,772 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:19,772 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 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:19,780 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:19,780 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:37:19,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:19,874 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:19,990 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 988 proven. 1711 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:37:19,990 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:20,816 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 988 proven. 1711 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:37:20,837 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:20,837 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 38 [2018-10-24 12:37:20,837 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:20,837 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:37:20,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:37:20,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=866, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:37:20,838 INFO L87 Difference]: Start difference. First operand 309 states and 310 transitions. Second operand 38 states. [2018-10-24 12:37:21,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:21,274 INFO L93 Difference]: Finished difference Result 319 states and 320 transitions. [2018-10-24 12:37:21,274 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-24 12:37:21,274 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 306 [2018-10-24 12:37:21,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:21,277 INFO L225 Difference]: With dead ends: 319 [2018-10-24 12:37:21,277 INFO L226 Difference]: Without dead ends: 317 [2018-10-24 12:37:21,277 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 680 GetRequests, 581 SyntacticMatches, 61 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1144 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=553, Invalid=1007, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:37:21,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2018-10-24 12:37:21,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 317. [2018-10-24 12:37:21,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 317 states. [2018-10-24 12:37:21,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 318 transitions. [2018-10-24 12:37:21,287 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 318 transitions. Word has length 306 [2018-10-24 12:37:21,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:21,287 INFO L481 AbstractCegarLoop]: Abstraction has 317 states and 318 transitions. [2018-10-24 12:37:21,287 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:37:21,287 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 318 transitions. [2018-10-24 12:37:21,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2018-10-24 12:37:21,289 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:21,289 INFO L375 BasicCegarLoop]: trace histogram [31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:21,289 INFO L424 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:21,289 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:21,290 INFO L82 PathProgramCache]: Analyzing trace with hash -1052547589, now seen corresponding path program 59 times [2018-10-24 12:37:21,290 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:21,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:21,290 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:21,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:21,291 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:21,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:22,632 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-24 12:37:22,632 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:22,632 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:22,632 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:22,633 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:22,633 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:22,633 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:22,641 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:37:22,641 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:37:22,768 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2018-10-24 12:37:22,768 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:22,774 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:24,759 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-24 12:37:24,759 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:26,005 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-24 12:37:26,027 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:26,027 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 96 [2018-10-24 12:37:26,027 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:26,028 INFO L460 AbstractCegarLoop]: Interpolant automaton has 96 states [2018-10-24 12:37:26,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2018-10-24 12:37:26,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2111, Invalid=7009, Unknown=0, NotChecked=0, Total=9120 [2018-10-24 12:37:26,029 INFO L87 Difference]: Start difference. First operand 317 states and 318 transitions. Second operand 96 states. [2018-10-24 12:37:28,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:28,122 INFO L93 Difference]: Finished difference Result 452 states and 484 transitions. [2018-10-24 12:37:28,122 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-24 12:37:28,122 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 314 [2018-10-24 12:37:28,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:28,123 INFO L225 Difference]: With dead ends: 452 [2018-10-24 12:37:28,123 INFO L226 Difference]: Without dead ends: 319 [2018-10-24 12:37:28,125 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 724 GetRequests, 536 SyntacticMatches, 62 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6602 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=3727, Invalid=12529, Unknown=0, NotChecked=0, Total=16256 [2018-10-24 12:37:28,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2018-10-24 12:37:28,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 319. [2018-10-24 12:37:28,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 319 states. [2018-10-24 12:37:28,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 320 transitions. [2018-10-24 12:37:28,136 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 320 transitions. Word has length 314 [2018-10-24 12:37:28,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:28,136 INFO L481 AbstractCegarLoop]: Abstraction has 319 states and 320 transitions. [2018-10-24 12:37:28,136 INFO L482 AbstractCegarLoop]: Interpolant automaton has 96 states. [2018-10-24 12:37:28,136 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 320 transitions. [2018-10-24 12:37:28,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2018-10-24 12:37:28,137 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:28,138 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 31, 31, 31, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:28,138 INFO L424 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:28,138 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:28,138 INFO L82 PathProgramCache]: Analyzing trace with hash 1348141237, now seen corresponding path program 60 times [2018-10-24 12:37:28,138 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:28,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:28,139 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:28,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:28,139 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:28,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:28,763 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1051 proven. 1918 refuted. 0 times theorem prover too weak. 1653 trivial. 0 not checked. [2018-10-24 12:37:28,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:28,763 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:28,763 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:28,763 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:28,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:28,763 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 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:28,771 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:37:28,771 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:37:28,868 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:37:28,868 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:28,873 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:29,068 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1052 proven. 1830 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-24 12:37:29,068 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:30,241 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1052 proven. 1830 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-24 12:37:30,262 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:30,262 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36, 36] total 39 [2018-10-24 12:37:30,262 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:30,263 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:37:30,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:37:30,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=909, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:37:30,263 INFO L87 Difference]: Start difference. First operand 319 states and 320 transitions. Second operand 39 states. [2018-10-24 12:37:30,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:30,750 INFO L93 Difference]: Finished difference Result 329 states and 330 transitions. [2018-10-24 12:37:30,751 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-24 12:37:30,751 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 316 [2018-10-24 12:37:30,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:30,753 INFO L225 Difference]: With dead ends: 329 [2018-10-24 12:37:30,753 INFO L226 Difference]: Without dead ends: 327 [2018-10-24 12:37:30,754 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 702 GetRequests, 600 SyntacticMatches, 63 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1213 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=586, Invalid=1054, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:37:30,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2018-10-24 12:37:30,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 327. [2018-10-24 12:37:30,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 327 states. [2018-10-24 12:37:30,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 328 transitions. [2018-10-24 12:37:30,764 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 328 transitions. Word has length 316 [2018-10-24 12:37:30,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:30,765 INFO L481 AbstractCegarLoop]: Abstraction has 327 states and 328 transitions. [2018-10-24 12:37:30,765 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:37:30,765 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 328 transitions. [2018-10-24 12:37:30,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2018-10-24 12:37:30,766 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:30,767 INFO L375 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 32, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:30,767 INFO L424 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:30,767 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:30,767 INFO L82 PathProgramCache]: Analyzing trace with hash 1350971609, now seen corresponding path program 61 times [2018-10-24 12:37:30,767 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:30,768 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:30,768 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:30,768 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:30,768 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:30,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:32,225 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:37:32,225 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:32,225 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:32,226 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:32,226 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:32,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:32,226 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 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:32,235 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:32,236 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:37:32,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:32,326 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:34,472 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:37:34,472 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:35,882 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:37:35,902 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:35,902 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 99 [2018-10-24 12:37:35,902 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:35,903 INFO L460 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-10-24 12:37:35,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-10-24 12:37:35,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2243, Invalid=7459, Unknown=0, NotChecked=0, Total=9702 [2018-10-24 12:37:35,905 INFO L87 Difference]: Start difference. First operand 327 states and 328 transitions. Second operand 99 states. [2018-10-24 12:37:38,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:38,095 INFO L93 Difference]: Finished difference Result 466 states and 499 transitions. [2018-10-24 12:37:38,095 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-24 12:37:38,096 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 324 [2018-10-24 12:37:38,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:38,097 INFO L225 Difference]: With dead ends: 466 [2018-10-24 12:37:38,097 INFO L226 Difference]: Without dead ends: 329 [2018-10-24 12:37:38,099 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 747 GetRequests, 553 SyntacticMatches, 64 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7039 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=3959, Invalid=13333, Unknown=0, NotChecked=0, Total=17292 [2018-10-24 12:37:38,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2018-10-24 12:37:38,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 329. [2018-10-24 12:37:38,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 329 states. [2018-10-24 12:37:38,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 330 transitions. [2018-10-24 12:37:38,110 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 330 transitions. Word has length 324 [2018-10-24 12:37:38,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:38,111 INFO L481 AbstractCegarLoop]: Abstraction has 329 states and 330 transitions. [2018-10-24 12:37:38,111 INFO L482 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-10-24 12:37:38,111 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 330 transitions. [2018-10-24 12:37:38,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2018-10-24 12:37:38,113 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:38,113 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:38,113 INFO L424 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:38,114 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:38,114 INFO L82 PathProgramCache]: Analyzing trace with hash -259052781, now seen corresponding path program 62 times [2018-10-24 12:37:38,114 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:38,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:38,115 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:38,115 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:38,115 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:38,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:38,802 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1117 proven. 2044 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2018-10-24 12:37:38,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:38,803 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:38,803 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:38,803 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:38,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:38,803 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 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:38,812 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:37:38,812 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:37:38,957 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-10-24 12:37:38,957 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:38,962 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:39,194 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1118 proven. 1953 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:37:39,195 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:40,194 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1118 proven. 1953 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:37:40,215 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:40,215 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37] total 40 [2018-10-24 12:37:40,215 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:40,216 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-24 12:37:40,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-24 12:37:40,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=607, Invalid=953, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:37:40,216 INFO L87 Difference]: Start difference. First operand 329 states and 330 transitions. Second operand 40 states. [2018-10-24 12:37:40,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:40,627 INFO L93 Difference]: Finished difference Result 339 states and 340 transitions. [2018-10-24 12:37:40,628 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:37:40,628 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 326 [2018-10-24 12:37:40,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:40,630 INFO L225 Difference]: With dead ends: 339 [2018-10-24 12:37:40,631 INFO L226 Difference]: Without dead ends: 337 [2018-10-24 12:37:40,631 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 724 GetRequests, 619 SyntacticMatches, 65 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1284 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=620, Invalid=1102, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:37:40,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2018-10-24 12:37:40,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 337. [2018-10-24 12:37:40,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 337 states. [2018-10-24 12:37:40,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 338 transitions. [2018-10-24 12:37:40,647 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 338 transitions. Word has length 326 [2018-10-24 12:37:40,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:40,647 INFO L481 AbstractCegarLoop]: Abstraction has 337 states and 338 transitions. [2018-10-24 12:37:40,647 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-24 12:37:40,647 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 338 transitions. [2018-10-24 12:37:40,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2018-10-24 12:37:40,649 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:40,649 INFO L375 BasicCegarLoop]: trace histogram [33, 33, 33, 33, 33, 32, 32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:40,650 INFO L424 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:40,650 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:40,650 INFO L82 PathProgramCache]: Analyzing trace with hash 672210231, now seen corresponding path program 63 times [2018-10-24 12:37:40,650 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:40,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:40,651 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:40,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:40,651 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:40,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:42,321 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-24 12:37:42,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:42,322 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:42,322 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:42,322 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:42,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:42,322 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 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:42,337 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:37:42,337 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:37:42,436 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:37:42,436 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:42,442 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:44,689 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-24 12:37:44,690 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:46,103 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-24 12:37:46,125 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:46,126 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 102 [2018-10-24 12:37:46,126 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:46,126 INFO L460 AbstractCegarLoop]: Interpolant automaton has 102 states [2018-10-24 12:37:46,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2018-10-24 12:37:46,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2379, Invalid=7923, Unknown=0, NotChecked=0, Total=10302 [2018-10-24 12:37:46,127 INFO L87 Difference]: Start difference. First operand 337 states and 338 transitions. Second operand 102 states. [2018-10-24 12:37:48,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:48,377 INFO L93 Difference]: Finished difference Result 480 states and 514 transitions. [2018-10-24 12:37:48,378 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-24 12:37:48,378 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 334 [2018-10-24 12:37:48,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:48,379 INFO L225 Difference]: With dead ends: 480 [2018-10-24 12:37:48,379 INFO L226 Difference]: Without dead ends: 339 [2018-10-24 12:37:48,381 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 770 GetRequests, 570 SyntacticMatches, 66 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7490 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=4198, Invalid=14162, Unknown=0, NotChecked=0, Total=18360 [2018-10-24 12:37:48,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2018-10-24 12:37:48,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 339. [2018-10-24 12:37:48,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 339 states. [2018-10-24 12:37:48,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 339 states to 339 states and 340 transitions. [2018-10-24 12:37:48,394 INFO L78 Accepts]: Start accepts. Automaton has 339 states and 340 transitions. Word has length 334 [2018-10-24 12:37:48,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:48,395 INFO L481 AbstractCegarLoop]: Abstraction has 339 states and 340 transitions. [2018-10-24 12:37:48,395 INFO L482 AbstractCegarLoop]: Interpolant automaton has 102 states. [2018-10-24 12:37:48,395 INFO L276 IsEmpty]: Start isEmpty. Operand 339 states and 340 transitions. [2018-10-24 12:37:48,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2018-10-24 12:37:48,396 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:48,396 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 33, 33, 33, 32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:48,397 INFO L424 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:48,397 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:48,397 INFO L82 PathProgramCache]: Analyzing trace with hash 1887049457, now seen corresponding path program 64 times [2018-10-24 12:37:48,397 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:48,397 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:48,398 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:48,398 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:48,398 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:48,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:49,050 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1185 proven. 2174 refuted. 0 times theorem prover too weak. 1891 trivial. 0 not checked. [2018-10-24 12:37:49,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:49,050 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:49,051 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:49,051 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:49,051 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:49,051 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 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:49,058 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:49,058 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:37:49,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:49,159 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:49,339 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1186 proven. 2080 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-24 12:37:49,339 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:50,376 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1186 proven. 2080 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-24 12:37:50,397 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:50,397 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 41 [2018-10-24 12:37:50,397 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:50,398 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-24 12:37:50,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-24 12:37:50,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=642, Invalid=998, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:37:50,398 INFO L87 Difference]: Start difference. First operand 339 states and 340 transitions. Second operand 41 states. [2018-10-24 12:37:50,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:50,887 INFO L93 Difference]: Finished difference Result 349 states and 350 transitions. [2018-10-24 12:37:50,887 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-24 12:37:50,887 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 336 [2018-10-24 12:37:50,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:50,890 INFO L225 Difference]: With dead ends: 349 [2018-10-24 12:37:50,890 INFO L226 Difference]: Without dead ends: 347 [2018-10-24 12:37:50,891 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 746 GetRequests, 638 SyntacticMatches, 67 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1357 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=655, Invalid=1151, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:37:50,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2018-10-24 12:37:50,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 347. [2018-10-24 12:37:50,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 347 states. [2018-10-24 12:37:50,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 347 states to 347 states and 348 transitions. [2018-10-24 12:37:50,904 INFO L78 Accepts]: Start accepts. Automaton has 347 states and 348 transitions. Word has length 336 [2018-10-24 12:37:50,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:50,905 INFO L481 AbstractCegarLoop]: Abstraction has 347 states and 348 transitions. [2018-10-24 12:37:50,905 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-24 12:37:50,905 INFO L276 IsEmpty]: Start isEmpty. Operand 347 states and 348 transitions. [2018-10-24 12:37:50,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2018-10-24 12:37:50,907 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:50,907 INFO L375 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 34, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:50,907 INFO L424 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:50,907 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:50,907 INFO L82 PathProgramCache]: Analyzing trace with hash -2093397227, now seen corresponding path program 65 times [2018-10-24 12:37:50,908 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:50,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:50,908 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:50,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:50,909 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:50,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:52,773 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:37:52,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:52,774 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:52,774 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:52,774 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:52,774 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:52,774 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 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:52,782 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:37:52,782 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:37:52,926 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-10-24 12:37:52,926 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:52,932 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:55,123 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:37:55,123 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:56,635 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:37:56,658 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:56,658 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 105 [2018-10-24 12:37:56,658 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:56,659 INFO L460 AbstractCegarLoop]: Interpolant automaton has 105 states [2018-10-24 12:37:56,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2018-10-24 12:37:56,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2519, Invalid=8401, Unknown=0, NotChecked=0, Total=10920 [2018-10-24 12:37:56,660 INFO L87 Difference]: Start difference. First operand 347 states and 348 transitions. Second operand 105 states. [2018-10-24 12:37:59,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:59,030 INFO L93 Difference]: Finished difference Result 494 states and 529 transitions. [2018-10-24 12:37:59,030 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-10-24 12:37:59,030 INFO L78 Accepts]: Start accepts. Automaton has 105 states. Word has length 344 [2018-10-24 12:37:59,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:59,032 INFO L225 Difference]: With dead ends: 494 [2018-10-24 12:37:59,032 INFO L226 Difference]: Without dead ends: 349 [2018-10-24 12:37:59,034 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 793 GetRequests, 587 SyntacticMatches, 68 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7955 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=4444, Invalid=15016, Unknown=0, NotChecked=0, Total=19460 [2018-10-24 12:37:59,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2018-10-24 12:37:59,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 349. [2018-10-24 12:37:59,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 349 states. [2018-10-24 12:37:59,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 350 transitions. [2018-10-24 12:37:59,047 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 350 transitions. Word has length 344 [2018-10-24 12:37:59,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:59,047 INFO L481 AbstractCegarLoop]: Abstraction has 349 states and 350 transitions. [2018-10-24 12:37:59,048 INFO L482 AbstractCegarLoop]: Interpolant automaton has 105 states. [2018-10-24 12:37:59,048 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 350 transitions. [2018-10-24 12:37:59,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2018-10-24 12:37:59,049 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:59,049 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 34, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:59,049 INFO L424 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:59,050 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:59,050 INFO L82 PathProgramCache]: Analyzing trace with hash 162063439, now seen corresponding path program 66 times [2018-10-24 12:37:59,050 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:59,050 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:59,050 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:59,050 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:59,051 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:59,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:00,052 INFO L134 CoverageAnalysis]: Checked inductivity of 5579 backedges. 1255 proven. 2308 refuted. 0 times theorem prover too weak. 2016 trivial. 0 not checked. [2018-10-24 12:38:00,053 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:00,053 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:00,053 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:00,053 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:00,053 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:00,053 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 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:00,060 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:00,060 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:00,164 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:00,164 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:00,170 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:00,306 INFO L134 CoverageAnalysis]: Checked inductivity of 5579 backedges. 1256 proven. 2211 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:38:00,306 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:01,336 INFO L134 CoverageAnalysis]: Checked inductivity of 5579 backedges. 1256 proven. 2211 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:38:01,357 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:01,357 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39] total 42 [2018-10-24 12:38:01,357 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:01,358 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:38:01,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:38:01,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=678, Invalid=1044, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:38:01,358 INFO L87 Difference]: Start difference. First operand 349 states and 350 transitions. Second operand 42 states. [2018-10-24 12:38:01,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:01,780 INFO L93 Difference]: Finished difference Result 359 states and 360 transitions. [2018-10-24 12:38:01,781 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:38:01,781 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 346 [2018-10-24 12:38:01,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:01,783 INFO L225 Difference]: With dead ends: 359 [2018-10-24 12:38:01,783 INFO L226 Difference]: Without dead ends: 357 [2018-10-24 12:38:01,783 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 768 GetRequests, 657 SyntacticMatches, 69 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1432 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=691, Invalid=1201, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:38:01,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2018-10-24 12:38:01,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 357. [2018-10-24 12:38:01,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 357 states. [2018-10-24 12:38:01,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 357 states to 357 states and 358 transitions. [2018-10-24 12:38:01,795 INFO L78 Accepts]: Start accepts. Automaton has 357 states and 358 transitions. Word has length 346 [2018-10-24 12:38:01,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:01,795 INFO L481 AbstractCegarLoop]: Abstraction has 357 states and 358 transitions. [2018-10-24 12:38:01,795 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:38:01,796 INFO L276 IsEmpty]: Start isEmpty. Operand 357 states and 358 transitions. [2018-10-24 12:38:01,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 355 [2018-10-24 12:38:01,797 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:01,798 INFO L375 BasicCegarLoop]: trace histogram [35, 35, 35, 35, 35, 34, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:01,798 INFO L424 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:01,798 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:01,798 INFO L82 PathProgramCache]: Analyzing trace with hash 1282136691, now seen corresponding path program 67 times [2018-10-24 12:38:01,799 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:01,799 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:01,799 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:01,799 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:01,799 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:01,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:03,577 INFO L134 CoverageAnalysis]: Checked inductivity of 5848 backedges. 2414 proven. 1190 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-10-24 12:38:03,577 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:03,578 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:03,578 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:03,578 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:03,578 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:03,578 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 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:03,586 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:03,586 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:03,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:03,688 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:06,073 INFO L134 CoverageAnalysis]: Checked inductivity of 5848 backedges. 2414 proven. 1190 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-10-24 12:38:06,073 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:07,658 INFO L134 CoverageAnalysis]: Checked inductivity of 5848 backedges. 2414 proven. 1190 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-10-24 12:38:07,679 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:07,679 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 108 [2018-10-24 12:38:07,679 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:07,680 INFO L460 AbstractCegarLoop]: Interpolant automaton has 108 states [2018-10-24 12:38:07,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2018-10-24 12:38:07,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2663, Invalid=8893, Unknown=0, NotChecked=0, Total=11556 [2018-10-24 12:38:07,681 INFO L87 Difference]: Start difference. First operand 357 states and 358 transitions. Second operand 108 states. [2018-10-24 12:38:10,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:10,469 INFO L93 Difference]: Finished difference Result 508 states and 544 transitions. [2018-10-24 12:38:10,469 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-10-24 12:38:10,469 INFO L78 Accepts]: Start accepts. Automaton has 108 states. Word has length 354 [2018-10-24 12:38:10,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:10,470 INFO L225 Difference]: With dead ends: 508 [2018-10-24 12:38:10,470 INFO L226 Difference]: Without dead ends: 359 [2018-10-24 12:38:10,472 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 816 GetRequests, 604 SyntacticMatches, 70 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8434 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=4697, Invalid=15895, Unknown=0, NotChecked=0, Total=20592 [2018-10-24 12:38:10,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2018-10-24 12:38:10,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 359. [2018-10-24 12:38:10,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 359 states. [2018-10-24 12:38:10,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 360 transitions. [2018-10-24 12:38:10,486 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 360 transitions. Word has length 354 [2018-10-24 12:38:10,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:10,486 INFO L481 AbstractCegarLoop]: Abstraction has 359 states and 360 transitions. [2018-10-24 12:38:10,486 INFO L482 AbstractCegarLoop]: Interpolant automaton has 108 states. [2018-10-24 12:38:10,486 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 360 transitions. [2018-10-24 12:38:10,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 357 [2018-10-24 12:38:10,487 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:10,488 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 35, 35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:10,488 INFO L424 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:10,488 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:10,488 INFO L82 PathProgramCache]: Analyzing trace with hash 1052816173, now seen corresponding path program 68 times [2018-10-24 12:38:10,488 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:10,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:10,489 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:10,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:10,489 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:10,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:11,162 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 1327 proven. 2446 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-24 12:38:11,162 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:11,162 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:11,162 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:11,162 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:11,162 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:11,163 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 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:11,171 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:11,172 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:11,337 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-10-24 12:38:11,337 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:11,343 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:11,498 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 1328 proven. 2346 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-10-24 12:38:11,498 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:12,579 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 1328 proven. 2346 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-10-24 12:38:12,599 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:12,600 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40, 40] total 43 [2018-10-24 12:38:12,600 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:12,600 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-24 12:38:12,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-24 12:38:12,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=715, Invalid=1091, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:38:12,601 INFO L87 Difference]: Start difference. First operand 359 states and 360 transitions. Second operand 43 states. [2018-10-24 12:38:13,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:13,111 INFO L93 Difference]: Finished difference Result 369 states and 370 transitions. [2018-10-24 12:38:13,111 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-24 12:38:13,111 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 356 [2018-10-24 12:38:13,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:13,113 INFO L225 Difference]: With dead ends: 369 [2018-10-24 12:38:13,113 INFO L226 Difference]: Without dead ends: 367 [2018-10-24 12:38:13,114 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 790 GetRequests, 676 SyntacticMatches, 71 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1509 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=728, Invalid=1252, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:38:13,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2018-10-24 12:38:13,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 367. [2018-10-24 12:38:13,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 367 states. [2018-10-24 12:38:13,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 368 transitions. [2018-10-24 12:38:13,125 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 368 transitions. Word has length 356 [2018-10-24 12:38:13,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:13,126 INFO L481 AbstractCegarLoop]: Abstraction has 367 states and 368 transitions. [2018-10-24 12:38:13,126 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-24 12:38:13,126 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 368 transitions. [2018-10-24 12:38:13,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 365 [2018-10-24 12:38:13,127 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:13,128 INFO L375 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 36, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:13,128 INFO L424 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:13,128 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:13,128 INFO L82 PathProgramCache]: Analyzing trace with hash 523103057, now seen corresponding path program 69 times [2018-10-24 12:38:13,128 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:13,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:13,129 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:13,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:13,129 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:13,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:15,397 INFO L134 CoverageAnalysis]: Checked inductivity of 6195 backedges. 2555 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:38:15,398 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:15,398 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:15,398 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:15,398 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:15,398 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:15,398 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 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:15,405 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:15,405 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:15,512 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:15,512 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:15,519 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:17,643 INFO L134 CoverageAnalysis]: Checked inductivity of 6195 backedges. 2555 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:38:17,643 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:19,356 INFO L134 CoverageAnalysis]: Checked inductivity of 6195 backedges. 2555 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:38:19,377 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:19,377 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 111 [2018-10-24 12:38:19,377 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:19,378 INFO L460 AbstractCegarLoop]: Interpolant automaton has 111 states [2018-10-24 12:38:19,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2018-10-24 12:38:19,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2811, Invalid=9399, Unknown=0, NotChecked=0, Total=12210 [2018-10-24 12:38:19,379 INFO L87 Difference]: Start difference. First operand 367 states and 368 transitions. Second operand 111 states. [2018-10-24 12:38:22,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:22,257 INFO L93 Difference]: Finished difference Result 522 states and 559 transitions. [2018-10-24 12:38:22,257 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-10-24 12:38:22,257 INFO L78 Accepts]: Start accepts. Automaton has 111 states. Word has length 364 [2018-10-24 12:38:22,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:22,259 INFO L225 Difference]: With dead ends: 522 [2018-10-24 12:38:22,259 INFO L226 Difference]: Without dead ends: 369 [2018-10-24 12:38:22,261 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 839 GetRequests, 621 SyntacticMatches, 72 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8927 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=4957, Invalid=16799, Unknown=0, NotChecked=0, Total=21756 [2018-10-24 12:38:22,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2018-10-24 12:38:22,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 369. [2018-10-24 12:38:22,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 369 states. [2018-10-24 12:38:22,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 369 states to 369 states and 370 transitions. [2018-10-24 12:38:22,279 INFO L78 Accepts]: Start accepts. Automaton has 369 states and 370 transitions. Word has length 364 [2018-10-24 12:38:22,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:22,279 INFO L481 AbstractCegarLoop]: Abstraction has 369 states and 370 transitions. [2018-10-24 12:38:22,279 INFO L482 AbstractCegarLoop]: Interpolant automaton has 111 states. [2018-10-24 12:38:22,279 INFO L276 IsEmpty]: Start isEmpty. Operand 369 states and 370 transitions. [2018-10-24 12:38:22,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 367 [2018-10-24 12:38:22,282 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:22,282 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 36, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:22,282 INFO L424 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:22,282 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:22,282 INFO L82 PathProgramCache]: Analyzing trace with hash 1568580491, now seen corresponding path program 70 times [2018-10-24 12:38:22,283 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:22,283 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:22,283 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:22,283 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:22,284 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:22,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:23,052 INFO L134 CoverageAnalysis]: Checked inductivity of 6267 backedges. 1401 proven. 2588 refuted. 0 times theorem prover too weak. 2278 trivial. 0 not checked. [2018-10-24 12:38:23,053 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:23,053 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:23,053 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:23,053 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:23,053 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:23,053 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 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:23,060 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:23,060 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:23,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:23,172 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:23,311 INFO L134 CoverageAnalysis]: Checked inductivity of 6267 backedges. 1402 proven. 2485 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:38:23,311 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:24,445 INFO L134 CoverageAnalysis]: Checked inductivity of 6267 backedges. 1402 proven. 2485 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:38:24,465 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:24,465 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 44 [2018-10-24 12:38:24,465 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:24,466 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-24 12:38:24,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-24 12:38:24,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=753, Invalid=1139, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:38:24,467 INFO L87 Difference]: Start difference. First operand 369 states and 370 transitions. Second operand 44 states. [2018-10-24 12:38:24,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:24,981 INFO L93 Difference]: Finished difference Result 379 states and 380 transitions. [2018-10-24 12:38:24,982 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:38:24,982 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 366 [2018-10-24 12:38:24,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:24,984 INFO L225 Difference]: With dead ends: 379 [2018-10-24 12:38:24,984 INFO L226 Difference]: Without dead ends: 377 [2018-10-24 12:38:24,985 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 812 GetRequests, 695 SyntacticMatches, 73 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1588 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=766, Invalid=1304, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:38:24,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2018-10-24 12:38:24,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 377. [2018-10-24 12:38:24,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 377 states. [2018-10-24 12:38:25,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 378 transitions. [2018-10-24 12:38:25,000 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 378 transitions. Word has length 366 [2018-10-24 12:38:25,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:25,000 INFO L481 AbstractCegarLoop]: Abstraction has 377 states and 378 transitions. [2018-10-24 12:38:25,000 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-24 12:38:25,000 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 378 transitions. [2018-10-24 12:38:25,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2018-10-24 12:38:25,002 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:25,002 INFO L375 BasicCegarLoop]: trace histogram [37, 37, 37, 37, 37, 36, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:25,002 INFO L424 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:25,002 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:25,002 INFO L82 PathProgramCache]: Analyzing trace with hash -904094289, now seen corresponding path program 71 times [2018-10-24 12:38:25,003 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:25,003 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:25,003 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:25,003 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:25,003 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:25,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:27,056 INFO L134 CoverageAnalysis]: Checked inductivity of 6552 backedges. 2700 proven. 1332 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-10-24 12:38:27,056 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:27,056 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:27,056 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:27,057 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:27,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:27,057 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 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:27,066 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:27,066 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:27,220 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2018-10-24 12:38:27,220 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:27,226 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:29,498 INFO L134 CoverageAnalysis]: Checked inductivity of 6552 backedges. 2700 proven. 1332 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-10-24 12:38:29,498 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:31,507 INFO L134 CoverageAnalysis]: Checked inductivity of 6552 backedges. 2700 proven. 1332 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-10-24 12:38:31,527 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:31,528 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 114 [2018-10-24 12:38:31,528 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:31,528 INFO L460 AbstractCegarLoop]: Interpolant automaton has 114 states [2018-10-24 12:38:31,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2018-10-24 12:38:31,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2963, Invalid=9919, Unknown=0, NotChecked=0, Total=12882 [2018-10-24 12:38:31,529 INFO L87 Difference]: Start difference. First operand 377 states and 378 transitions. Second operand 114 states. [2018-10-24 12:38:34,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:34,329 INFO L93 Difference]: Finished difference Result 536 states and 574 transitions. [2018-10-24 12:38:34,329 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-10-24 12:38:34,329 INFO L78 Accepts]: Start accepts. Automaton has 114 states. Word has length 374 [2018-10-24 12:38:34,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:34,331 INFO L225 Difference]: With dead ends: 536 [2018-10-24 12:38:34,331 INFO L226 Difference]: Without dead ends: 379 [2018-10-24 12:38:34,332 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 862 GetRequests, 638 SyntacticMatches, 74 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9434 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=5224, Invalid=17728, Unknown=0, NotChecked=0, Total=22952 [2018-10-24 12:38:34,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2018-10-24 12:38:34,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 379. [2018-10-24 12:38:34,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 379 states. [2018-10-24 12:38:34,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 380 transitions. [2018-10-24 12:38:34,345 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 380 transitions. Word has length 374 [2018-10-24 12:38:34,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:34,345 INFO L481 AbstractCegarLoop]: Abstraction has 379 states and 380 transitions. [2018-10-24 12:38:34,345 INFO L482 AbstractCegarLoop]: Interpolant automaton has 114 states. [2018-10-24 12:38:34,345 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 380 transitions. [2018-10-24 12:38:34,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 377 [2018-10-24 12:38:34,347 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:34,347 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 37, 37, 37, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:34,347 INFO L424 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:34,347 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:34,347 INFO L82 PathProgramCache]: Analyzing trace with hash -2135435927, now seen corresponding path program 72 times [2018-10-24 12:38:34,347 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:34,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:34,348 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:34,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:34,348 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:34,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:35,159 INFO L134 CoverageAnalysis]: Checked inductivity of 6626 backedges. 1477 proven. 2734 refuted. 0 times theorem prover too weak. 2415 trivial. 0 not checked. [2018-10-24 12:38:35,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:35,160 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:35,160 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:35,160 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:35,160 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:35,160 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:35,167 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:35,167 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:35,277 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:35,277 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:35,283 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:35,577 INFO L134 CoverageAnalysis]: Checked inductivity of 6626 backedges. 1478 proven. 2628 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-10-24 12:38:35,578 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:36,783 INFO L134 CoverageAnalysis]: Checked inductivity of 6626 backedges. 1478 proven. 2628 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-10-24 12:38:36,805 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:36,805 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 45 [2018-10-24 12:38:36,805 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:36,806 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:38:36,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:38:36,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=792, Invalid=1188, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:38:36,806 INFO L87 Difference]: Start difference. First operand 379 states and 380 transitions. Second operand 45 states. [2018-10-24 12:38:37,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:37,332 INFO L93 Difference]: Finished difference Result 389 states and 390 transitions. [2018-10-24 12:38:37,332 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-24 12:38:37,332 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 376 [2018-10-24 12:38:37,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:37,335 INFO L225 Difference]: With dead ends: 389 [2018-10-24 12:38:37,335 INFO L226 Difference]: Without dead ends: 387 [2018-10-24 12:38:37,335 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 834 GetRequests, 714 SyntacticMatches, 75 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1669 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=805, Invalid=1357, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:38:37,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2018-10-24 12:38:37,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 387. [2018-10-24 12:38:37,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 387 states. [2018-10-24 12:38:37,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 388 transitions. [2018-10-24 12:38:37,347 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 388 transitions. Word has length 376 [2018-10-24 12:38:37,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:37,348 INFO L481 AbstractCegarLoop]: Abstraction has 387 states and 388 transitions. [2018-10-24 12:38:37,348 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:38:37,348 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 388 transitions. [2018-10-24 12:38:37,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 385 [2018-10-24 12:38:37,349 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:37,350 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 38, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:37,350 INFO L424 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:37,350 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:37,350 INFO L82 PathProgramCache]: Analyzing trace with hash 1357713805, now seen corresponding path program 73 times [2018-10-24 12:38:37,350 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:37,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:37,351 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:37,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:37,351 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:37,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:39,288 INFO L134 CoverageAnalysis]: Checked inductivity of 6919 backedges. 2849 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:38:39,288 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:39,288 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:39,288 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:39,288 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:39,289 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:39,289 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 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:39,296 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:39,296 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:39,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:39,413 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:42,048 INFO L134 CoverageAnalysis]: Checked inductivity of 6919 backedges. 2849 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:38:42,048 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:43,936 INFO L134 CoverageAnalysis]: Checked inductivity of 6919 backedges. 2849 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:38:43,957 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:43,957 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 117 [2018-10-24 12:38:43,957 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:43,958 INFO L460 AbstractCegarLoop]: Interpolant automaton has 117 states [2018-10-24 12:38:43,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2018-10-24 12:38:43,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3119, Invalid=10453, Unknown=0, NotChecked=0, Total=13572 [2018-10-24 12:38:43,960 INFO L87 Difference]: Start difference. First operand 387 states and 388 transitions. Second operand 117 states. [2018-10-24 12:38:47,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:47,216 INFO L93 Difference]: Finished difference Result 550 states and 589 transitions. [2018-10-24 12:38:47,216 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-10-24 12:38:47,216 INFO L78 Accepts]: Start accepts. Automaton has 117 states. Word has length 384 [2018-10-24 12:38:47,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:47,217 INFO L225 Difference]: With dead ends: 550 [2018-10-24 12:38:47,218 INFO L226 Difference]: Without dead ends: 389 [2018-10-24 12:38:47,219 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 885 GetRequests, 655 SyntacticMatches, 76 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9955 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=5498, Invalid=18682, Unknown=0, NotChecked=0, Total=24180 [2018-10-24 12:38:47,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2018-10-24 12:38:47,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 389. [2018-10-24 12:38:47,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 389 states. [2018-10-24 12:38:47,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 389 states to 389 states and 390 transitions. [2018-10-24 12:38:47,234 INFO L78 Accepts]: Start accepts. Automaton has 389 states and 390 transitions. Word has length 384 [2018-10-24 12:38:47,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:47,234 INFO L481 AbstractCegarLoop]: Abstraction has 389 states and 390 transitions. [2018-10-24 12:38:47,234 INFO L482 AbstractCegarLoop]: Interpolant automaton has 117 states. [2018-10-24 12:38:47,234 INFO L276 IsEmpty]: Start isEmpty. Operand 389 states and 390 transitions. [2018-10-24 12:38:47,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2018-10-24 12:38:47,236 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:47,236 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 38, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:47,236 INFO L424 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:47,236 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:47,236 INFO L82 PathProgramCache]: Analyzing trace with hash 307849415, now seen corresponding path program 74 times [2018-10-24 12:38:47,236 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:47,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:47,237 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:47,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:47,237 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:47,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:48,005 INFO L134 CoverageAnalysis]: Checked inductivity of 6995 backedges. 1555 proven. 2884 refuted. 0 times theorem prover too weak. 2556 trivial. 0 not checked. [2018-10-24 12:38:48,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:48,006 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:48,006 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:48,006 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:48,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:48,006 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 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:48,013 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:48,013 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:48,181 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-10-24 12:38:48,181 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:48,187 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:48,362 INFO L134 CoverageAnalysis]: Checked inductivity of 6995 backedges. 1556 proven. 2775 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:38:48,363 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:49,587 INFO L134 CoverageAnalysis]: Checked inductivity of 6995 backedges. 1556 proven. 2775 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:38:49,608 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:49,608 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43, 43] total 46 [2018-10-24 12:38:49,608 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:49,609 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-24 12:38:49,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-24 12:38:49,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=832, Invalid=1238, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:38:49,610 INFO L87 Difference]: Start difference. First operand 389 states and 390 transitions. Second operand 46 states. [2018-10-24 12:38:50,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:50,221 INFO L93 Difference]: Finished difference Result 399 states and 400 transitions. [2018-10-24 12:38:50,222 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-24 12:38:50,222 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 386 [2018-10-24 12:38:50,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:50,225 INFO L225 Difference]: With dead ends: 399 [2018-10-24 12:38:50,225 INFO L226 Difference]: Without dead ends: 397 [2018-10-24 12:38:50,225 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 856 GetRequests, 733 SyntacticMatches, 77 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1752 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=845, Invalid=1411, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:38:50,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2018-10-24 12:38:50,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 397. [2018-10-24 12:38:50,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 397 states. [2018-10-24 12:38:50,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 398 transitions. [2018-10-24 12:38:50,239 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 398 transitions. Word has length 386 [2018-10-24 12:38:50,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:50,239 INFO L481 AbstractCegarLoop]: Abstraction has 397 states and 398 transitions. [2018-10-24 12:38:50,239 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-24 12:38:50,239 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 398 transitions. [2018-10-24 12:38:50,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 395 [2018-10-24 12:38:50,241 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:50,241 INFO L375 BasicCegarLoop]: trace histogram [39, 39, 39, 39, 39, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:50,241 INFO L424 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:50,241 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:50,242 INFO L82 PathProgramCache]: Analyzing trace with hash 1852597995, now seen corresponding path program 75 times [2018-10-24 12:38:50,242 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:50,242 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:50,242 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:50,242 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:50,242 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:50,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Received shutdown request... [2018-10-24 12:38:50,450 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-24 12:38:50,455 WARN L205 ceAbstractionStarter]: Timeout [2018-10-24 12:38:50,455 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:38:50 BoogieIcfgContainer [2018-10-24 12:38:50,455 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:38:50,456 INFO L168 Benchmark]: Toolchain (without parser) took 231259.55 ms. Allocated memory was 1.5 GB in the beginning and 2.5 GB in the end (delta: 997.2 MB). Free memory was 1.4 GB in the beginning and 1.7 GB in the end (delta: -281.6 MB). Peak memory consumption was 715.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:38:50,457 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:38:50,457 INFO L168 Benchmark]: CACSL2BoogieTranslator took 277.80 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:38:50,457 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.70 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:38:50,458 INFO L168 Benchmark]: Boogie Preprocessor took 29.59 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:38:50,458 INFO L168 Benchmark]: RCFGBuilder took 416.35 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 739.2 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -809.7 MB). Peak memory consumption was 26.9 MB. Max. memory is 7.1 GB. [2018-10-24 12:38:50,459 INFO L168 Benchmark]: TraceAbstraction took 230504.93 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 257.9 MB). Free memory was 2.2 GB in the beginning and 1.7 GB in the end (delta: 517.5 MB). Peak memory consumption was 775.5 MB. Max. memory is 7.1 GB. [2018-10-24 12:38:50,461 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 277.80 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 24.70 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 29.59 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 416.35 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 739.2 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -809.7 MB). Peak memory consumption was 26.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 230504.93 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 257.9 MB). Free memory was 2.2 GB in the beginning and 1.7 GB in the end (delta: 517.5 MB). Peak memory consumption was 775.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 395 with TraceHistMax 39,while InterpolatingTraceCheckCraig was constructing Craig interpolants,while PredicateComparison was comparing new predicate (quantifier-free) to 5 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 22 locations, 1 error locations. TIMEOUT Result, 230.4s OverallTime, 78 OverallIterations, 39 TraceHistogramMax, 67.5s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 3905 SDtfs, 3029 SDslu, 44274 SDs, 0 SdLazy, 53683 SolverSat, 3654 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 34.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 34463 GetRequests, 27386 SyntacticMatches, 2997 SemanticMatches, 4080 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155218 ImplicationChecksByTransitivity, 157.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=397occurred in iteration=77, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.7s AutomataMinimizationTime, 77 MinimizatonAttempts, 5 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.9s SsaConstructionTime, 5.8s SatisfiabilityAnalysisTime, 149.3s InterpolantComputationTime, 30383 NumberOfCodeBlocks, 30383 NumberOfCodeBlocksAsserted, 669 NumberOfCheckSat, 45328 ConstructedInterpolants, 0 QuantifiedInterpolants, 31881352 SizeOfPredicates, 222 NumberOfNonLiveVariables, 32190 ConjunctsInSsa, 3256 ConjunctsInUnsatCore, 225 InterpolantComputations, 3 PerfectInterpolantSequences, 375700/540128 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown