java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/up_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:07:45,402 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:07:45,404 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:07:45,423 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:07:45,423 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:07:45,424 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:07:45,425 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:07:45,427 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:07:45,429 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:07:45,430 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:07:45,431 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:07:45,431 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:07:45,432 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:07:45,433 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:07:45,434 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:07:45,435 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:07:45,436 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:07:45,438 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:07:45,439 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:07:45,444 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:07:45,445 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:07:45,447 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:07:45,451 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-22 16:07:45,451 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-22 16:07:45,452 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-22 16:07:45,453 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-22 16:07:45,454 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-22 16:07:45,454 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-22 16:07:45,455 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-22 16:07:45,458 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-22 16:07:45,459 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-22 16:07:45,459 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-22 16:07:45,460 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-22 16:07:45,460 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-22 16:07:45,461 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-22 16:07:45,462 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-22 16:07:45,462 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-22 16:07:45,487 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:07:45,487 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:07:45,489 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:07:45,489 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:07:45,489 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:07:45,490 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:07:45,490 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:07:45,490 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:07:45,490 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:07:45,490 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:07:45,491 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:07:45,491 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:07:45,491 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:07:45,492 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:07:45,492 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:07:45,492 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:07:45,492 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:07:45,492 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:07:45,493 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:07:45,494 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:07:45,494 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:07:45,494 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:07:45,494 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:07:45,495 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:07:45,495 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:07:45,495 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:07:45,495 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:07:45,496 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:07:45,496 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:07:45,496 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:07:45,496 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:07:45,496 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:07:45,496 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:07:45,497 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:07:45,541 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:07:45,555 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:07:45,558 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:07:45,560 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:07:45,560 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:07:45,561 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-invgen/up_true-unreach-call_true-termination.i [2018-10-22 16:07:45,618 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/e33c7c2fa/3847f426db604addb09ee91de0d67a77/FLAG1e57bf81c [2018-10-22 16:07:46,091 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:07:46,092 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/up_true-unreach-call_true-termination.i [2018-10-22 16:07:46,102 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/e33c7c2fa/3847f426db604addb09ee91de0d67a77/FLAG1e57bf81c [2018-10-22 16:07:46,122 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/e33c7c2fa/3847f426db604addb09ee91de0d67a77 [2018-10-22 16:07:46,133 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:07:46,137 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:07:46,138 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:07:46,139 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:07:46,143 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:07:46,144 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:07:46" (1/1) ... [2018-10-22 16:07:46,147 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ef8a67d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:07:46, skipping insertion in model container [2018-10-22 16:07:46,147 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:07:46" (1/1) ... [2018-10-22 16:07:46,159 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:07:46,186 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:07:46,390 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:07:46,394 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:07:46,411 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:07:46,427 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:07:46,427 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:07:46 WrapperNode [2018-10-22 16:07:46,428 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:07:46,428 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:07:46,429 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:07:46,429 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:07:46,438 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:07:46" (1/1) ... [2018-10-22 16:07:46,444 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:07:46" (1/1) ... [2018-10-22 16:07:46,450 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:07:46,451 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:07:46,451 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:07:46,451 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:07:46,461 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:07:46" (1/1) ... [2018-10-22 16:07:46,462 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:07:46" (1/1) ... [2018-10-22 16:07:46,462 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:07:46" (1/1) ... [2018-10-22 16:07:46,463 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:07:46" (1/1) ... [2018-10-22 16:07:46,466 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:07:46" (1/1) ... [2018-10-22 16:07:46,471 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:07:46" (1/1) ... [2018-10-22 16:07:46,472 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:07:46" (1/1) ... [2018-10-22 16:07:46,473 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:07:46,474 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:07:46,474 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:07:46,474 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:07:46,475 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:07:46" (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 [2018-10-22 16:07:46,538 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:07:46,538 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:07:46,538 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:07:46,538 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:07:46,539 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:07:46,539 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:07:46,539 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:07:46,539 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:07:46,889 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:07:46,890 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:07:46 BoogieIcfgContainer [2018-10-22 16:07:46,890 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:07:46,891 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:07:46,891 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:07:46,894 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:07:46,895 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:07:46" (1/3) ... [2018-10-22 16:07:46,895 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ce33c39 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:07:46, skipping insertion in model container [2018-10-22 16:07:46,896 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:07:46" (2/3) ... [2018-10-22 16:07:46,896 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ce33c39 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:07:46, skipping insertion in model container [2018-10-22 16:07:46,896 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:07:46" (3/3) ... [2018-10-22 16:07:46,898 INFO L112 eAbstractionObserver]: Analyzing ICFG up_true-unreach-call_true-termination.i [2018-10-22 16:07:46,909 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:07:46,917 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:07:46,935 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:07:46,969 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:07:46,970 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:07:46,971 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:07:46,971 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:07:46,971 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:07:46,971 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:07:46,971 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:07:46,972 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:07:46,972 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:07:46,990 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-10-22 16:07:46,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-22 16:07:46,996 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:47,000 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:47,005 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:47,011 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:47,011 INFO L82 PathProgramCache]: Analyzing trace with hash -1884544245, now seen corresponding path program 1 times [2018-10-22 16:07:47,014 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:47,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:47,065 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:07:47,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:47,065 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:47,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:47,139 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:47,141 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:07:47,141 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:07:47,141 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:07:47,144 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:07:47,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:07:47,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:07:47,159 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2018-10-22 16:07:47,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:47,182 INFO L93 Difference]: Finished difference Result 37 states and 44 transitions. [2018-10-22 16:07:47,182 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:07:47,183 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-10-22 16:07:47,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:47,191 INFO L225 Difference]: With dead ends: 37 [2018-10-22 16:07:47,192 INFO L226 Difference]: Without dead ends: 18 [2018-10-22 16:07:47,195 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 [2018-10-22 16:07:47,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-22 16:07:47,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-22 16:07:47,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-22 16:07:47,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-10-22 16:07:47,237 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-10-22 16:07:47,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:47,238 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-10-22 16:07:47,238 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:07:47,238 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-10-22 16:07:47,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-22 16:07:47,239 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:47,239 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:47,240 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:47,240 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:47,240 INFO L82 PathProgramCache]: Analyzing trace with hash 1969781111, now seen corresponding path program 1 times [2018-10-22 16:07:47,241 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:47,242 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:47,242 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:07:47,242 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:47,242 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:47,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:47,520 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:47,521 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:07:47,521 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-22 16:07:47,521 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:07:47,523 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 16:07:47,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 16:07:47,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-22 16:07:47,524 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 5 states. [2018-10-22 16:07:47,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:47,638 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2018-10-22 16:07:47,639 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 16:07:47,639 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2018-10-22 16:07:47,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:47,640 INFO L225 Difference]: With dead ends: 33 [2018-10-22 16:07:47,640 INFO L226 Difference]: Without dead ends: 20 [2018-10-22 16:07:47,641 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-10-22 16:07:47,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-22 16:07:47,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-22 16:07:47,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-22 16:07:47,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2018-10-22 16:07:47,647 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 14 [2018-10-22 16:07:47,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:47,648 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2018-10-22 16:07:47,648 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 16:07:47,648 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2018-10-22 16:07:47,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-22 16:07:47,649 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:47,649 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:47,650 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:47,650 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:47,651 INFO L82 PathProgramCache]: Analyzing trace with hash -1960344783, now seen corresponding path program 1 times [2018-10-22 16:07:47,651 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:47,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:47,652 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:07:47,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:47,653 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:47,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:47,746 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:47,746 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:07:47,747 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-10-22 16:07:47,747 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:07:47,747 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 16:07:47,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 16:07:47,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:07:47,748 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 6 states. [2018-10-22 16:07:47,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:47,947 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2018-10-22 16:07:47,948 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 16:07:47,948 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2018-10-22 16:07:47,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:47,955 INFO L225 Difference]: With dead ends: 34 [2018-10-22 16:07:47,956 INFO L226 Difference]: Without dead ends: 32 [2018-10-22 16:07:47,956 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-10-22 16:07:47,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-22 16:07:47,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 27. [2018-10-22 16:07:47,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-22 16:07:47,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-10-22 16:07:47,979 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 16 [2018-10-22 16:07:47,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:47,980 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-10-22 16:07:47,980 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 16:07:47,980 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-10-22 16:07:47,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-22 16:07:47,981 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:47,981 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:47,981 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:47,981 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:47,982 INFO L82 PathProgramCache]: Analyzing trace with hash -1864992939, now seen corresponding path program 1 times [2018-10-22 16:07:47,984 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:47,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:47,985 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:07:47,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:47,985 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:48,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:48,232 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:48,232 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:48,233 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:48,234 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-10-22 16:07:48,236 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [18], [22], [28], [30], [35], [38], [40], [43], [45], [46], [47], [48], [50], [51] [2018-10-22 16:07:48,287 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:07:48,287 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:07:48,822 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:07:48,823 INFO L272 AbstractInterpreter]: Visited 19 different actions 195 times. Merged at 8 different actions 83 times. Widened at 3 different actions 15 times. Found 8 fixpoints after 2 different actions. Largest state had 9 variables. [2018-10-22 16:07:48,840 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:48,841 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:07:48,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:48,842 INFO L197 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 [2018-10-22 16:07:48,851 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:07:48,851 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:07:48,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:48,876 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:49,002 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:49,002 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:49,073 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:49,103 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:49,103 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:49,126 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:07:49,127 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:07:49,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:49,151 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:49,160 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:49,161 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:49,337 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:49,339 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:49,339 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 9 [2018-10-22 16:07:49,339 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:49,340 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 16:07:49,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 16:07:49,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2018-10-22 16:07:49,341 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2018-10-22 16:07:49,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:49,459 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2018-10-22 16:07:49,460 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 16:07:49,460 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2018-10-22 16:07:49,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:49,463 INFO L225 Difference]: With dead ends: 46 [2018-10-22 16:07:49,463 INFO L226 Difference]: Without dead ends: 29 [2018-10-22 16:07:49,464 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:07:49,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-22 16:07:49,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-10-22 16:07:49,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-22 16:07:49,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2018-10-22 16:07:49,470 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 24 [2018-10-22 16:07:49,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:49,470 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2018-10-22 16:07:49,470 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 16:07:49,471 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2018-10-22 16:07:49,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-22 16:07:49,472 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:49,472 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:49,472 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:49,472 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:49,473 INFO L82 PathProgramCache]: Analyzing trace with hash -62381937, now seen corresponding path program 2 times [2018-10-22 16:07:49,473 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:49,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:49,474 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:07:49,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:49,474 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:49,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:49,644 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:49,644 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:49,645 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:49,645 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:49,645 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:49,645 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:49,645 INFO L197 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 [2018-10-22 16:07:49,662 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:07:49,662 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:07:49,709 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:07:49,709 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:49,712 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:49,969 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:49,970 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:50,016 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:50,036 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:50,037 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:50,052 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:07:50,052 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:07:50,075 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:07:50,075 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:50,079 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:50,087 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:50,087 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:50,178 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:07:50,180 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:50,180 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7, 7, 7] total 10 [2018-10-22 16:07:50,180 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:50,180 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:07:50,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:07:50,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:07:50,181 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 10 states. [2018-10-22 16:07:50,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:50,373 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2018-10-22 16:07:50,374 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 16:07:50,375 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2018-10-22 16:07:50,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:50,376 INFO L225 Difference]: With dead ends: 39 [2018-10-22 16:07:50,376 INFO L226 Difference]: Without dead ends: 37 [2018-10-22 16:07:50,377 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 95 SyntacticMatches, 10 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:07:50,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-22 16:07:50,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-10-22 16:07:50,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-22 16:07:50,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2018-10-22 16:07:50,384 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 26 [2018-10-22 16:07:50,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:50,385 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2018-10-22 16:07:50,385 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:07:50,385 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2018-10-22 16:07:50,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-22 16:07:50,386 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:50,387 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:50,387 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:50,387 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:50,387 INFO L82 PathProgramCache]: Analyzing trace with hash 1261098675, now seen corresponding path program 3 times [2018-10-22 16:07:50,388 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:50,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:50,388 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:50,389 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:50,389 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:50,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:50,507 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:07:50,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:50,508 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:50,508 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:50,509 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:50,509 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:50,509 INFO L197 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 [2018-10-22 16:07:50,524 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:07:50,524 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:07:50,561 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-22 16:07:50,561 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:50,564 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:50,716 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:07:50,716 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:50,829 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:07:50,850 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:50,850 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:50,866 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:07:50,866 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:07:50,899 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-22 16:07:50,900 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:50,904 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:50,914 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:07:50,914 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:51,059 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:07:51,061 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:51,061 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 12 [2018-10-22 16:07:51,061 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:51,062 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 16:07:51,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 16:07:51,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:07:51,063 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 12 states. [2018-10-22 16:07:51,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:51,223 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2018-10-22 16:07:51,229 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 16:07:51,229 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2018-10-22 16:07:51,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:51,230 INFO L225 Difference]: With dead ends: 60 [2018-10-22 16:07:51,230 INFO L226 Difference]: Without dead ends: 39 [2018-10-22 16:07:51,231 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 121 SyntacticMatches, 12 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=73, Invalid=167, Unknown=0, NotChecked=0, Total=240 [2018-10-22 16:07:51,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-22 16:07:51,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-10-22 16:07:51,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-22 16:07:51,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-10-22 16:07:51,238 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 34 [2018-10-22 16:07:51,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:51,238 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-10-22 16:07:51,238 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 16:07:51,238 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-10-22 16:07:51,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-22 16:07:51,240 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:51,240 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:51,240 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:51,240 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:51,240 INFO L82 PathProgramCache]: Analyzing trace with hash -1825718419, now seen corresponding path program 4 times [2018-10-22 16:07:51,241 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:51,241 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:51,242 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:51,242 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:51,242 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:51,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:51,474 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 15 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:07:51,474 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:51,475 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:51,475 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:51,475 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:51,475 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:51,475 INFO L197 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 [2018-10-22 16:07:51,483 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:07:51,483 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:07:51,499 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:07:51,499 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:51,502 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:51,533 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:07:51,533 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:51,613 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:07:51,633 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:51,633 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:51,650 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:07:51,650 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:07:51,681 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:07:51,682 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:51,686 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:51,699 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:07:51,699 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:51,786 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:07:51,788 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:51,788 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8, 8, 8] total 11 [2018-10-22 16:07:51,789 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:51,789 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 16:07:51,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 16:07:51,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2018-10-22 16:07:51,790 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 11 states. [2018-10-22 16:07:51,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:51,947 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-10-22 16:07:51,947 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:07:51,947 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 36 [2018-10-22 16:07:51,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:51,949 INFO L225 Difference]: With dead ends: 49 [2018-10-22 16:07:51,950 INFO L226 Difference]: Without dead ends: 47 [2018-10-22 16:07:51,950 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 132 SyntacticMatches, 14 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-10-22 16:07:51,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-10-22 16:07:51,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-10-22 16:07:51,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-22 16:07:51,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2018-10-22 16:07:51,958 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 36 [2018-10-22 16:07:51,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:51,958 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2018-10-22 16:07:51,958 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 16:07:51,958 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2018-10-22 16:07:51,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-22 16:07:51,960 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:51,960 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:51,961 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:51,961 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:51,961 INFO L82 PathProgramCache]: Analyzing trace with hash -51726447, now seen corresponding path program 5 times [2018-10-22 16:07:51,962 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:51,962 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:51,963 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:51,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:51,963 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:51,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:52,079 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:07:52,080 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:52,080 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:52,080 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:52,080 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:52,080 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:52,080 INFO L197 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 [2018-10-22 16:07:52,088 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:07:52,088 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:07:52,127 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2018-10-22 16:07:52,127 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:52,131 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:52,231 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:07:52,232 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:52,365 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:07:52,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:52,385 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:52,402 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:07:52,402 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:07:52,452 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2018-10-22 16:07:52,452 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:52,456 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:52,468 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:07:52,468 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:52,557 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:07:52,558 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:52,558 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 15 [2018-10-22 16:07:52,558 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:52,561 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 16:07:52,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 16:07:52,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2018-10-22 16:07:52,562 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 15 states. [2018-10-22 16:07:52,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:52,742 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2018-10-22 16:07:52,743 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 16:07:52,744 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2018-10-22 16:07:52,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:52,745 INFO L225 Difference]: With dead ends: 74 [2018-10-22 16:07:52,745 INFO L226 Difference]: Without dead ends: 49 [2018-10-22 16:07:52,746 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 156 SyntacticMatches, 16 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=271, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:07:52,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-22 16:07:52,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-10-22 16:07:52,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-10-22 16:07:52,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2018-10-22 16:07:52,753 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 44 [2018-10-22 16:07:52,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:52,754 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2018-10-22 16:07:52,754 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 16:07:52,754 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2018-10-22 16:07:52,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-22 16:07:52,755 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:52,756 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:52,756 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:52,756 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:52,756 INFO L82 PathProgramCache]: Analyzing trace with hash 446005195, now seen corresponding path program 6 times [2018-10-22 16:07:52,756 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:52,757 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:52,757 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:52,757 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:52,758 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:52,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:52,866 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 25 proven. 28 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-22 16:07:52,867 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:52,867 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:52,867 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:52,867 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:52,867 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:52,867 INFO L197 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 [2018-10-22 16:07:52,875 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:07:52,875 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:07:52,905 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2018-10-22 16:07:52,905 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:52,907 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:52,944 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:07:52,944 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:53,211 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:07:53,231 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:53,231 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:53,247 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:07:53,248 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:07:53,294 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2018-10-22 16:07:53,294 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:53,297 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:53,307 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:07:53,307 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:53,400 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:07:53,401 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:53,402 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9, 9, 9] total 12 [2018-10-22 16:07:53,402 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:53,402 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 16:07:53,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 16:07:53,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:07:53,404 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 12 states. [2018-10-22 16:07:53,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:53,648 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2018-10-22 16:07:53,649 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 16:07:53,650 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 46 [2018-10-22 16:07:53,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:53,651 INFO L225 Difference]: With dead ends: 59 [2018-10-22 16:07:53,651 INFO L226 Difference]: Without dead ends: 57 [2018-10-22 16:07:53,652 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 169 SyntacticMatches, 18 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:07:53,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-22 16:07:53,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-10-22 16:07:53,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-22 16:07:53,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-10-22 16:07:53,659 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 46 [2018-10-22 16:07:53,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:53,660 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-10-22 16:07:53,660 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 16:07:53,660 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-10-22 16:07:53,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-10-22 16:07:53,661 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:53,661 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:53,662 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:53,662 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:53,662 INFO L82 PathProgramCache]: Analyzing trace with hash -239912465, now seen corresponding path program 7 times [2018-10-22 16:07:53,662 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:53,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:53,663 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:53,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:53,663 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:53,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:53,828 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:07:53,829 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:53,829 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:53,829 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:53,829 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:53,829 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:53,829 INFO L197 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 [2018-10-22 16:07:53,837 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:07:53,838 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:07:53,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:53,870 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:54,328 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:07:54,328 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:54,548 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:07:54,574 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:54,574 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:54,588 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:07:54,589 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:07:54,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:54,624 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:54,635 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:07:54,635 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:55,040 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:07:55,042 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:55,042 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 18 [2018-10-22 16:07:55,042 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:55,042 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 16:07:55,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 16:07:55,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:07:55,043 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 18 states. [2018-10-22 16:07:55,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:55,226 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2018-10-22 16:07:55,227 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 16:07:55,227 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 54 [2018-10-22 16:07:55,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:55,229 INFO L225 Difference]: With dead ends: 88 [2018-10-22 16:07:55,229 INFO L226 Difference]: Without dead ends: 59 [2018-10-22 16:07:55,230 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 191 SyntacticMatches, 20 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=152, Invalid=400, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:07:55,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-10-22 16:07:55,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-10-22 16:07:55,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-22 16:07:55,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2018-10-22 16:07:55,237 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 54 [2018-10-22 16:07:55,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:55,238 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2018-10-22 16:07:55,238 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 16:07:55,238 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2018-10-22 16:07:55,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-22 16:07:55,239 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:55,239 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:55,239 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:55,240 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:55,240 INFO L82 PathProgramCache]: Analyzing trace with hash -363560535, now seen corresponding path program 8 times [2018-10-22 16:07:55,240 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:55,241 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:55,241 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:07:55,241 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:55,241 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:55,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:55,344 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 37 proven. 46 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:07:55,344 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:55,344 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:55,344 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:55,344 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:55,344 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:55,344 INFO L197 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 [2018-10-22 16:07:55,354 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:07:55,354 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:07:55,374 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:07:55,374 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:55,376 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:55,509 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:07:55,509 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:55,659 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:07:55,679 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:55,679 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:55,694 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:07:55,694 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:07:55,732 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:07:55,732 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:55,735 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:55,745 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:07:55,745 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:55,845 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:07:55,846 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:55,846 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10, 10, 10] total 13 [2018-10-22 16:07:55,846 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:55,847 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 16:07:55,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 16:07:55,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-10-22 16:07:55,847 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand 13 states. [2018-10-22 16:07:55,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:55,965 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2018-10-22 16:07:55,965 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 16:07:55,966 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 56 [2018-10-22 16:07:55,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:55,967 INFO L225 Difference]: With dead ends: 69 [2018-10-22 16:07:55,967 INFO L226 Difference]: Without dead ends: 67 [2018-10-22 16:07:55,968 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 206 SyntacticMatches, 22 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2018-10-22 16:07:55,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-22 16:07:55,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-10-22 16:07:55,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-10-22 16:07:55,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2018-10-22 16:07:55,976 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 56 [2018-10-22 16:07:55,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:55,977 INFO L481 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2018-10-22 16:07:55,977 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 16:07:55,977 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2018-10-22 16:07:55,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-22 16:07:55,978 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:55,978 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:55,978 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:55,978 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:55,979 INFO L82 PathProgramCache]: Analyzing trace with hash 1782152653, now seen corresponding path program 9 times [2018-10-22 16:07:55,979 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:55,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:55,980 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:55,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:55,980 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:55,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:56,945 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:07:56,945 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:56,945 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:56,945 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:56,946 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:56,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:56,946 INFO L197 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 [2018-10-22 16:07:56,953 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:07:56,953 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:07:56,980 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-22 16:07:56,980 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:56,982 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:57,151 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:07:57,151 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:57,290 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:07:57,311 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:57,311 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:57,326 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:07:57,326 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:07:57,404 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-22 16:07:57,404 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:57,409 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:57,425 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:07:57,426 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:57,663 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:07:57,665 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:57,665 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 21 [2018-10-22 16:07:57,665 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:57,666 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-22 16:07:57,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-22 16:07:57,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2018-10-22 16:07:57,667 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 21 states. [2018-10-22 16:07:58,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:58,085 INFO L93 Difference]: Finished difference Result 102 states and 109 transitions. [2018-10-22 16:07:58,085 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:07:58,085 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 64 [2018-10-22 16:07:58,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:58,086 INFO L225 Difference]: With dead ends: 102 [2018-10-22 16:07:58,087 INFO L226 Difference]: Without dead ends: 69 [2018-10-22 16:07:58,088 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 226 SyntacticMatches, 24 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 343 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=202, Invalid=554, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:07:58,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-22 16:07:58,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-10-22 16:07:58,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-22 16:07:58,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-10-22 16:07:58,102 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 64 [2018-10-22 16:07:58,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:58,102 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-10-22 16:07:58,102 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-22 16:07:58,102 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-10-22 16:07:58,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-10-22 16:07:58,105 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:58,105 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:58,105 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:58,105 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:58,105 INFO L82 PathProgramCache]: Analyzing trace with hash 1767367943, now seen corresponding path program 10 times [2018-10-22 16:07:58,106 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:58,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:58,107 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:58,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:58,107 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:58,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:58,227 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 51 proven. 68 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-22 16:07:58,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:58,228 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:58,228 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:58,228 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:58,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:58,228 INFO L197 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 [2018-10-22 16:07:58,238 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:07:58,238 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:07:58,259 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:07:58,259 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:58,260 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:58,300 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:07:58,300 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:58,381 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:07:58,402 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:58,402 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:58,417 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:07:58,418 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:07:58,467 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:07:58,467 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:58,471 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:58,484 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:07:58,484 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:58,609 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:07:58,611 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:58,611 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11, 11, 11] total 14 [2018-10-22 16:07:58,611 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:58,611 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-22 16:07:58,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-22 16:07:58,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:07:58,612 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 14 states. [2018-10-22 16:07:58,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:58,847 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-10-22 16:07:58,847 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 16:07:58,847 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 66 [2018-10-22 16:07:58,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:58,849 INFO L225 Difference]: With dead ends: 79 [2018-10-22 16:07:58,849 INFO L226 Difference]: Without dead ends: 77 [2018-10-22 16:07:58,850 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 243 SyntacticMatches, 26 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2018-10-22 16:07:58,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-10-22 16:07:58,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2018-10-22 16:07:58,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-22 16:07:58,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2018-10-22 16:07:58,857 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 66 [2018-10-22 16:07:58,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:58,857 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2018-10-22 16:07:58,857 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-22 16:07:58,857 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2018-10-22 16:07:58,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-22 16:07:58,859 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:58,859 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:58,859 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:58,859 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:58,859 INFO L82 PathProgramCache]: Analyzing trace with hash 508207915, now seen corresponding path program 11 times [2018-10-22 16:07:58,859 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:58,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:58,860 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:58,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:58,860 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:58,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:59,029 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:07:59,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:59,029 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:59,029 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:59,029 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:59,030 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:59,030 INFO L197 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 [2018-10-22 16:07:59,037 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:07:59,037 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:07:59,062 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-10-22 16:07:59,062 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:59,064 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:59,234 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:07:59,234 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:59,343 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:07:59,363 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:59,364 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:59,381 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:07:59,381 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:07:59,462 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-10-22 16:07:59,462 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:59,467 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:59,483 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:07:59,483 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:59,761 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:07:59,763 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:59,763 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 24 [2018-10-22 16:07:59,763 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:59,764 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-22 16:07:59,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-22 16:07:59,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=409, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:07:59,765 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand 24 states. [2018-10-22 16:08:00,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:00,078 INFO L93 Difference]: Finished difference Result 116 states and 124 transitions. [2018-10-22 16:08:00,078 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 16:08:00,078 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 74 [2018-10-22 16:08:00,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:00,080 INFO L225 Difference]: With dead ends: 116 [2018-10-22 16:08:00,080 INFO L226 Difference]: Without dead ends: 79 [2018-10-22 16:08:00,081 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 261 SyntacticMatches, 28 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 474 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=259, Invalid=733, Unknown=0, NotChecked=0, Total=992 [2018-10-22 16:08:00,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-22 16:08:00,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-10-22 16:08:00,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-22 16:08:00,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-10-22 16:08:00,088 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 74 [2018-10-22 16:08:00,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:00,089 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-10-22 16:08:00,089 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-22 16:08:00,089 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-10-22 16:08:00,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-22 16:08:00,090 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:00,090 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:00,090 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:00,091 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:00,091 INFO L82 PathProgramCache]: Analyzing trace with hash 262457829, now seen corresponding path program 12 times [2018-10-22 16:08:00,091 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:00,092 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:00,092 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:00,092 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:00,092 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:00,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:00,293 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 67 proven. 94 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-22 16:08:00,293 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:00,293 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:00,293 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:00,294 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:00,294 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:00,294 INFO L197 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 [2018-10-22 16:08:00,301 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:00,301 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:00,333 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2018-10-22 16:08:00,333 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:00,335 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:00,383 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:08:00,384 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:00,485 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:08:00,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:00,505 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:00,536 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:00,536 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:00,622 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2018-10-22 16:08:00,622 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:00,626 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:00,637 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:08:00,637 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:00,807 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:08:00,808 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:00,809 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12, 12, 12] total 15 [2018-10-22 16:08:00,809 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:00,809 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 16:08:00,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 16:08:00,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2018-10-22 16:08:00,810 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 15 states. [2018-10-22 16:08:01,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:01,018 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2018-10-22 16:08:01,018 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 16:08:01,018 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 76 [2018-10-22 16:08:01,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:01,020 INFO L225 Difference]: With dead ends: 89 [2018-10-22 16:08:01,020 INFO L226 Difference]: Without dead ends: 87 [2018-10-22 16:08:01,021 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 280 SyntacticMatches, 30 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2018-10-22 16:08:01,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-22 16:08:01,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-10-22 16:08:01,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-10-22 16:08:01,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-10-22 16:08:01,027 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 76 [2018-10-22 16:08:01,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:01,027 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-10-22 16:08:01,027 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 16:08:01,027 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-10-22 16:08:01,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-10-22 16:08:01,028 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:01,028 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:01,029 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:01,029 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:01,029 INFO L82 PathProgramCache]: Analyzing trace with hash 1053542921, now seen corresponding path program 13 times [2018-10-22 16:08:01,029 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:01,030 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:01,030 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:01,030 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:01,030 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:01,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:01,233 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:08:01,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:01,233 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:01,234 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:01,234 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:01,234 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:01,234 INFO L197 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 [2018-10-22 16:08:01,243 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:01,243 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:01,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:01,266 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:01,643 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:08:01,643 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:01,847 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:08:01,867 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:01,867 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:01,884 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:01,885 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:01,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:01,941 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:01,957 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:08:01,957 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:02,161 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:08:02,163 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:02,163 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 27 [2018-10-22 16:08:02,163 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:02,163 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-22 16:08:02,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-22 16:08:02,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=523, Unknown=0, NotChecked=0, Total=702 [2018-10-22 16:08:02,164 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 27 states. [2018-10-22 16:08:02,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:02,478 INFO L93 Difference]: Finished difference Result 130 states and 139 transitions. [2018-10-22 16:08:02,479 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 16:08:02,479 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 84 [2018-10-22 16:08:02,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:02,480 INFO L225 Difference]: With dead ends: 130 [2018-10-22 16:08:02,480 INFO L226 Difference]: Without dead ends: 89 [2018-10-22 16:08:02,481 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 296 SyntacticMatches, 32 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 626 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=323, Invalid=937, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:08:02,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-10-22 16:08:02,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2018-10-22 16:08:02,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-22 16:08:02,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 90 transitions. [2018-10-22 16:08:02,488 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 90 transitions. Word has length 84 [2018-10-22 16:08:02,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:02,488 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 90 transitions. [2018-10-22 16:08:02,488 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-22 16:08:02,488 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 90 transitions. [2018-10-22 16:08:02,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-10-22 16:08:02,489 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:02,489 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:02,489 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:02,490 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:02,490 INFO L82 PathProgramCache]: Analyzing trace with hash -396865469, now seen corresponding path program 14 times [2018-10-22 16:08:02,490 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:02,490 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:02,490 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:02,490 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:02,490 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:02,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:02,641 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 85 proven. 124 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:08:02,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:02,641 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:02,641 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:02,641 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:02,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:02,641 INFO L197 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 [2018-10-22 16:08:02,649 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:02,649 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:02,679 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:02,679 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:02,682 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:02,794 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:08:02,795 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:02,928 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:08:02,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:02,948 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:02,972 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:02,972 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:03,027 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:03,027 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:03,031 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:03,044 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:08:03,044 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:03,173 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:08:03,174 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:03,174 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13, 13, 13] total 16 [2018-10-22 16:08:03,174 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:03,175 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:08:03,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:08:03,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2018-10-22 16:08:03,175 INFO L87 Difference]: Start difference. First operand 89 states and 90 transitions. Second operand 16 states. [2018-10-22 16:08:03,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:03,529 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2018-10-22 16:08:03,529 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:08:03,529 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 86 [2018-10-22 16:08:03,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:03,531 INFO L225 Difference]: With dead ends: 99 [2018-10-22 16:08:03,531 INFO L226 Difference]: Without dead ends: 97 [2018-10-22 16:08:03,532 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 317 SyntacticMatches, 34 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:08:03,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-10-22 16:08:03,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-10-22 16:08:03,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-10-22 16:08:03,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-10-22 16:08:03,538 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 86 [2018-10-22 16:08:03,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:03,538 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-10-22 16:08:03,538 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:08:03,538 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-10-22 16:08:03,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-10-22 16:08:03,539 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:03,539 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:03,539 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:03,540 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:03,540 INFO L82 PathProgramCache]: Analyzing trace with hash -138800537, now seen corresponding path program 15 times [2018-10-22 16:08:03,540 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:03,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:03,541 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:03,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:03,541 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:03,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:03,834 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-22 16:08:03,834 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:03,834 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:03,834 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:03,835 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:03,835 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:03,835 INFO L197 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 [2018-10-22 16:08:03,843 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:03,843 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:03,880 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-22 16:08:03,880 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:03,882 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:04,086 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-22 16:08:04,087 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:04,219 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-22 16:08:04,239 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:04,239 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:04,253 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:04,253 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:04,367 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-22 16:08:04,367 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:04,371 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:04,387 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-22 16:08:04,388 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:04,599 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-22 16:08:04,601 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:04,601 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21] total 30 [2018-10-22 16:08:04,601 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:04,601 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-22 16:08:04,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-22 16:08:04,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=651, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:08:04,602 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 30 states. [2018-10-22 16:08:04,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:04,992 INFO L93 Difference]: Finished difference Result 144 states and 154 transitions. [2018-10-22 16:08:04,993 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-22 16:08:04,993 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 94 [2018-10-22 16:08:04,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:04,994 INFO L225 Difference]: With dead ends: 144 [2018-10-22 16:08:04,994 INFO L226 Difference]: Without dead ends: 99 [2018-10-22 16:08:04,995 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 331 SyntacticMatches, 36 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 799 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=394, Invalid=1166, Unknown=0, NotChecked=0, Total=1560 [2018-10-22 16:08:04,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-10-22 16:08:05,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2018-10-22 16:08:05,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-22 16:08:05,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2018-10-22 16:08:05,002 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 94 [2018-10-22 16:08:05,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:05,003 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2018-10-22 16:08:05,003 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-22 16:08:05,003 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2018-10-22 16:08:05,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-22 16:08:05,004 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:05,004 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:05,004 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:05,004 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:05,004 INFO L82 PathProgramCache]: Analyzing trace with hash -1817733087, now seen corresponding path program 16 times [2018-10-22 16:08:05,004 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:05,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:05,005 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:05,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:05,005 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:05,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:05,519 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 105 proven. 158 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-22 16:08:05,519 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:05,520 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:05,520 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:05,520 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:05,520 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:05,520 INFO L197 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 [2018-10-22 16:08:05,529 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:05,529 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:05,559 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:05,559 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:05,561 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:05,620 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-22 16:08:05,620 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:05,785 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-22 16:08:05,805 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:05,805 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:05,823 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:05,824 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:05,895 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:05,895 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:05,900 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:05,913 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-22 16:08:05,913 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:06,152 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-22 16:08:06,153 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:06,153 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14, 14, 14] total 17 [2018-10-22 16:08:06,153 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:06,154 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 16:08:06,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 16:08:06,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=194, Unknown=0, NotChecked=0, Total=272 [2018-10-22 16:08:06,154 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand 17 states. [2018-10-22 16:08:06,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:06,382 INFO L93 Difference]: Finished difference Result 109 states and 110 transitions. [2018-10-22 16:08:06,383 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 16:08:06,383 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 96 [2018-10-22 16:08:06,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:06,385 INFO L225 Difference]: With dead ends: 109 [2018-10-22 16:08:06,385 INFO L226 Difference]: Without dead ends: 107 [2018-10-22 16:08:06,386 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 354 SyntacticMatches, 38 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 249 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2018-10-22 16:08:06,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2018-10-22 16:08:06,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2018-10-22 16:08:06,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-10-22 16:08:06,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 108 transitions. [2018-10-22 16:08:06,391 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 108 transitions. Word has length 96 [2018-10-22 16:08:06,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:06,392 INFO L481 AbstractCegarLoop]: Abstraction has 107 states and 108 transitions. [2018-10-22 16:08:06,392 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 16:08:06,392 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 108 transitions. [2018-10-22 16:08:06,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-22 16:08:06,393 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:06,393 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:06,393 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:06,393 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:06,393 INFO L82 PathProgramCache]: Analyzing trace with hash 1915395141, now seen corresponding path program 17 times [2018-10-22 16:08:06,393 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:06,394 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:06,394 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:06,394 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:06,395 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:06,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:06,823 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-22 16:08:06,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:06,824 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:06,824 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:06,824 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:06,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:06,824 INFO L197 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 [2018-10-22 16:08:06,831 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:06,831 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:06,869 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2018-10-22 16:08:06,869 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:06,873 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:07,784 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-22 16:08:07,784 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:07,948 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-22 16:08:07,968 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:07,968 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:07,983 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:07,983 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:08,119 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2018-10-22 16:08:08,120 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:08,124 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:08,145 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-22 16:08:08,145 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:08,327 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-22 16:08:08,328 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:08,329 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 33 [2018-10-22 16:08:08,329 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:08,329 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-22 16:08:08,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-22 16:08:08,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=793, Unknown=0, NotChecked=0, Total=1056 [2018-10-22 16:08:08,331 INFO L87 Difference]: Start difference. First operand 107 states and 108 transitions. Second operand 33 states. [2018-10-22 16:08:08,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:08,854 INFO L93 Difference]: Finished difference Result 158 states and 169 transitions. [2018-10-22 16:08:08,854 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-22 16:08:08,854 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 104 [2018-10-22 16:08:08,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:08,856 INFO L225 Difference]: With dead ends: 158 [2018-10-22 16:08:08,856 INFO L226 Difference]: Without dead ends: 109 [2018-10-22 16:08:08,857 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 448 GetRequests, 366 SyntacticMatches, 40 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 993 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=472, Invalid=1420, Unknown=0, NotChecked=0, Total=1892 [2018-10-22 16:08:08,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-10-22 16:08:08,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2018-10-22 16:08:08,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2018-10-22 16:08:08,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 110 transitions. [2018-10-22 16:08:08,866 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 110 transitions. Word has length 104 [2018-10-22 16:08:08,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:08,866 INFO L481 AbstractCegarLoop]: Abstraction has 109 states and 110 transitions. [2018-10-22 16:08:08,866 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-22 16:08:08,866 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 110 transitions. [2018-10-22 16:08:08,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2018-10-22 16:08:08,867 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:08,868 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:08,868 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:08,868 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:08,868 INFO L82 PathProgramCache]: Analyzing trace with hash -924860033, now seen corresponding path program 18 times [2018-10-22 16:08:08,868 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:08,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:08,870 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:08,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:08,870 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:08,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:09,317 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 127 proven. 196 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-22 16:08:09,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:09,317 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:09,318 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:09,318 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:09,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:09,318 INFO L197 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 [2018-10-22 16:08:09,326 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:09,326 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:09,363 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2018-10-22 16:08:09,364 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:09,367 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:09,401 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-22 16:08:09,401 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:09,618 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-22 16:08:09,637 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:09,638 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:09,652 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:09,652 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:09,792 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2018-10-22 16:08:09,792 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:09,797 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:09,814 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-22 16:08:09,814 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:10,125 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-22 16:08:10,126 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:10,126 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15, 15, 15] total 18 [2018-10-22 16:08:10,126 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:10,127 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 16:08:10,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 16:08:10,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:08:10,128 INFO L87 Difference]: Start difference. First operand 109 states and 110 transitions. Second operand 18 states. [2018-10-22 16:08:10,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:10,313 INFO L93 Difference]: Finished difference Result 119 states and 120 transitions. [2018-10-22 16:08:10,313 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 16:08:10,313 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 106 [2018-10-22 16:08:10,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:10,315 INFO L225 Difference]: With dead ends: 119 [2018-10-22 16:08:10,315 INFO L226 Difference]: Without dead ends: 117 [2018-10-22 16:08:10,316 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 451 GetRequests, 391 SyntacticMatches, 42 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 296 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:08:10,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-10-22 16:08:10,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2018-10-22 16:08:10,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-22 16:08:10,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 118 transitions. [2018-10-22 16:08:10,322 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 118 transitions. Word has length 106 [2018-10-22 16:08:10,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:10,323 INFO L481 AbstractCegarLoop]: Abstraction has 117 states and 118 transitions. [2018-10-22 16:08:10,323 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 16:08:10,323 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 118 transitions. [2018-10-22 16:08:10,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-10-22 16:08:10,324 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:10,324 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:10,324 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:10,324 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:10,324 INFO L82 PathProgramCache]: Analyzing trace with hash 1447724963, now seen corresponding path program 19 times [2018-10-22 16:08:10,324 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:10,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:10,325 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:10,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:10,325 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:10,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:10,589 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-22 16:08:10,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:10,589 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:10,590 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:10,590 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:10,590 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:10,590 INFO L197 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 [2018-10-22 16:08:10,600 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:10,600 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:10,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:10,637 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:10,907 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-22 16:08:10,907 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:11,116 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-22 16:08:11,136 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:11,136 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:11,152 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:11,152 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:11,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:11,222 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:11,244 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-22 16:08:11,244 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:11,477 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-22 16:08:11,478 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:11,479 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 25, 25] total 36 [2018-10-22 16:08:11,479 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:11,479 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-22 16:08:11,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-22 16:08:11,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=949, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:08:11,480 INFO L87 Difference]: Start difference. First operand 117 states and 118 transitions. Second operand 36 states. [2018-10-22 16:08:12,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:12,150 INFO L93 Difference]: Finished difference Result 172 states and 184 transitions. [2018-10-22 16:08:12,154 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-22 16:08:12,154 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 114 [2018-10-22 16:08:12,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:12,155 INFO L225 Difference]: With dead ends: 172 [2018-10-22 16:08:12,155 INFO L226 Difference]: Without dead ends: 119 [2018-10-22 16:08:12,156 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 491 GetRequests, 401 SyntacticMatches, 44 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1208 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=557, Invalid=1699, Unknown=0, NotChecked=0, Total=2256 [2018-10-22 16:08:12,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2018-10-22 16:08:12,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2018-10-22 16:08:12,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-10-22 16:08:12,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 120 transitions. [2018-10-22 16:08:12,163 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 120 transitions. Word has length 114 [2018-10-22 16:08:12,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:12,164 INFO L481 AbstractCegarLoop]: Abstraction has 119 states and 120 transitions. [2018-10-22 16:08:12,164 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-22 16:08:12,164 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 120 transitions. [2018-10-22 16:08:12,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-22 16:08:12,165 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:12,165 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:12,165 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:12,165 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:12,165 INFO L82 PathProgramCache]: Analyzing trace with hash 1483074653, now seen corresponding path program 20 times [2018-10-22 16:08:12,166 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:12,166 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:12,166 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:12,166 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:12,166 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:12,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:12,380 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 151 proven. 238 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:08:12,380 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:12,381 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:12,381 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:12,381 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:12,381 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:12,381 INFO L197 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 [2018-10-22 16:08:12,390 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:12,390 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:12,423 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:12,423 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:12,426 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:12,943 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-22 16:08:12,943 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:13,735 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-22 16:08:13,757 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:13,757 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:13,772 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:13,773 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:13,844 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:13,844 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:13,850 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:13,868 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-22 16:08:13,868 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:14,058 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-22 16:08:14,060 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:14,060 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16, 16, 16] total 19 [2018-10-22 16:08:14,060 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:14,060 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-22 16:08:14,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-22 16:08:14,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=239, Unknown=0, NotChecked=0, Total=342 [2018-10-22 16:08:14,061 INFO L87 Difference]: Start difference. First operand 119 states and 120 transitions. Second operand 19 states. [2018-10-22 16:08:14,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:14,276 INFO L93 Difference]: Finished difference Result 129 states and 130 transitions. [2018-10-22 16:08:14,277 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 16:08:14,277 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 116 [2018-10-22 16:08:14,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:14,278 INFO L225 Difference]: With dead ends: 129 [2018-10-22 16:08:14,278 INFO L226 Difference]: Without dead ends: 127 [2018-10-22 16:08:14,278 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 428 SyntacticMatches, 46 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=116, Invalid=304, Unknown=0, NotChecked=0, Total=420 [2018-10-22 16:08:14,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-22 16:08:14,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2018-10-22 16:08:14,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-10-22 16:08:14,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2018-10-22 16:08:14,284 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 116 [2018-10-22 16:08:14,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:14,285 INFO L481 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2018-10-22 16:08:14,285 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-22 16:08:14,285 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2018-10-22 16:08:14,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2018-10-22 16:08:14,285 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:14,286 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:14,286 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:14,286 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:14,286 INFO L82 PathProgramCache]: Analyzing trace with hash -849415039, now seen corresponding path program 21 times [2018-10-22 16:08:14,286 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:14,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:14,287 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:14,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:14,287 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:14,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:14,667 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-22 16:08:14,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:14,668 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:14,668 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:14,668 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:14,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:14,668 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:14,675 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:14,675 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:14,878 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-22 16:08:14,878 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:14,881 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:15,227 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-22 16:08:15,228 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:15,445 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-22 16:08:15,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:15,465 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:15,480 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:15,480 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:15,662 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-22 16:08:15,662 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:15,667 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:15,696 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-22 16:08:15,696 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:16,036 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-22 16:08:16,037 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:16,037 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 27] total 39 [2018-10-22 16:08:16,037 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:16,038 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-22 16:08:16,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-22 16:08:16,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=1119, Unknown=0, NotChecked=0, Total=1482 [2018-10-22 16:08:16,039 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand 39 states. [2018-10-22 16:08:16,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:16,878 INFO L93 Difference]: Finished difference Result 186 states and 199 transitions. [2018-10-22 16:08:16,889 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-22 16:08:16,889 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 124 [2018-10-22 16:08:16,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:16,890 INFO L225 Difference]: With dead ends: 186 [2018-10-22 16:08:16,890 INFO L226 Difference]: Without dead ends: 129 [2018-10-22 16:08:16,893 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 534 GetRequests, 436 SyntacticMatches, 48 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1444 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=649, Invalid=2003, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:08:16,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-10-22 16:08:16,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2018-10-22 16:08:16,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-10-22 16:08:16,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 130 transitions. [2018-10-22 16:08:16,901 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 130 transitions. Word has length 124 [2018-10-22 16:08:16,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:16,901 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 130 transitions. [2018-10-22 16:08:16,902 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-22 16:08:16,902 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 130 transitions. [2018-10-22 16:08:16,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2018-10-22 16:08:16,904 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:16,905 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:16,905 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:16,905 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:16,905 INFO L82 PathProgramCache]: Analyzing trace with hash -1380501317, now seen corresponding path program 22 times [2018-10-22 16:08:16,905 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:16,906 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:16,906 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:16,906 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:16,906 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:16,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:17,797 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 177 proven. 284 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-22 16:08:17,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:17,797 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:17,797 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:17,797 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:17,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:17,798 INFO L197 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 [2018-10-22 16:08:17,805 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:17,806 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:17,848 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:17,848 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:17,851 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:17,948 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 178 proven. 253 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-22 16:08:17,948 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:18,198 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 178 proven. 253 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-22 16:08:18,217 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:18,218 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:18,232 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:18,233 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:18,324 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:18,324 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:18,329 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:18,348 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 178 proven. 253 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-22 16:08:18,348 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:18,617 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 178 proven. 253 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-22 16:08:18,618 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:18,618 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17, 17, 17] total 20 [2018-10-22 16:08:18,618 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:18,618 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-22 16:08:18,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-22 16:08:18,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=263, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:08:18,619 INFO L87 Difference]: Start difference. First operand 129 states and 130 transitions. Second operand 20 states. [2018-10-22 16:08:18,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:18,821 INFO L93 Difference]: Finished difference Result 139 states and 140 transitions. [2018-10-22 16:08:18,822 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 16:08:18,822 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 126 [2018-10-22 16:08:18,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:18,824 INFO L225 Difference]: With dead ends: 139 [2018-10-22 16:08:18,824 INFO L226 Difference]: Without dead ends: 137 [2018-10-22 16:08:18,824 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 535 GetRequests, 465 SyntacticMatches, 50 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 402 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=130, Invalid=332, Unknown=0, NotChecked=0, Total=462 [2018-10-22 16:08:18,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2018-10-22 16:08:18,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2018-10-22 16:08:18,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2018-10-22 16:08:18,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 138 transitions. [2018-10-22 16:08:18,830 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 138 transitions. Word has length 126 [2018-10-22 16:08:18,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:18,831 INFO L481 AbstractCegarLoop]: Abstraction has 137 states and 138 transitions. [2018-10-22 16:08:18,831 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-22 16:08:18,831 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 138 transitions. [2018-10-22 16:08:18,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-22 16:08:18,832 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:18,832 INFO L375 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:18,832 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:18,833 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:18,833 INFO L82 PathProgramCache]: Analyzing trace with hash 63242975, now seen corresponding path program 23 times [2018-10-22 16:08:18,833 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:18,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:18,834 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:18,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:18,834 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:18,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:19,207 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-22 16:08:19,207 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:19,207 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:19,207 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:19,207 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:19,208 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:19,208 INFO L197 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 [2018-10-22 16:08:19,214 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:19,214 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:19,257 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2018-10-22 16:08:19,257 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:19,260 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:19,822 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-22 16:08:19,822 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:20,091 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-22 16:08:20,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:20,112 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:20,127 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:20,127 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:20,328 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2018-10-22 16:08:20,328 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:20,334 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:20,365 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-22 16:08:20,365 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:20,707 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-22 16:08:20,708 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:20,708 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29] total 42 [2018-10-22 16:08:20,709 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:20,709 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-22 16:08:20,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-22 16:08:20,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=1303, Unknown=0, NotChecked=0, Total=1722 [2018-10-22 16:08:20,710 INFO L87 Difference]: Start difference. First operand 137 states and 138 transitions. Second operand 42 states. [2018-10-22 16:08:21,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:21,316 INFO L93 Difference]: Finished difference Result 200 states and 214 transitions. [2018-10-22 16:08:21,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-22 16:08:21,317 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 134 [2018-10-22 16:08:21,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:21,318 INFO L225 Difference]: With dead ends: 200 [2018-10-22 16:08:21,318 INFO L226 Difference]: Without dead ends: 139 [2018-10-22 16:08:21,319 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 577 GetRequests, 471 SyntacticMatches, 52 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1701 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=748, Invalid=2332, Unknown=0, NotChecked=0, Total=3080 [2018-10-22 16:08:21,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-22 16:08:21,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2018-10-22 16:08:21,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-10-22 16:08:21,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2018-10-22 16:08:21,327 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 134 [2018-10-22 16:08:21,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:21,327 INFO L481 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2018-10-22 16:08:21,327 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-22 16:08:21,327 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2018-10-22 16:08:21,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2018-10-22 16:08:21,328 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:21,328 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:21,328 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:21,329 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:21,329 INFO L82 PathProgramCache]: Analyzing trace with hash -781662567, now seen corresponding path program 24 times [2018-10-22 16:08:21,329 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:21,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:21,330 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:21,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:21,330 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:21,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:22,154 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 205 proven. 334 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-22 16:08:22,154 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:22,154 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:22,155 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:22,155 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:22,155 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:22,155 INFO L197 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 [2018-10-22 16:08:22,162 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:22,162 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:22,208 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2018-10-22 16:08:22,208 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:22,211 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:22,337 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 206 proven. 300 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-22 16:08:22,337 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:22,522 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 206 proven. 300 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-22 16:08:22,542 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:22,542 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:22,557 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:22,558 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:22,827 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2018-10-22 16:08:22,828 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:22,833 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:22,853 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 206 proven. 300 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-22 16:08:22,854 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:23,092 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 206 proven. 300 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-22 16:08:23,093 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:23,093 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18, 18, 18] total 21 [2018-10-22 16:08:23,094 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:23,094 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-22 16:08:23,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-22 16:08:23,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=288, Unknown=0, NotChecked=0, Total=420 [2018-10-22 16:08:23,094 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand 21 states. [2018-10-22 16:08:23,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:23,539 INFO L93 Difference]: Finished difference Result 149 states and 150 transitions. [2018-10-22 16:08:23,540 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-22 16:08:23,540 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 136 [2018-10-22 16:08:23,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:23,541 INFO L225 Difference]: With dead ends: 149 [2018-10-22 16:08:23,542 INFO L226 Difference]: Without dead ends: 147 [2018-10-22 16:08:23,543 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 577 GetRequests, 502 SyntacticMatches, 54 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 461 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=145, Invalid=361, Unknown=0, NotChecked=0, Total=506 [2018-10-22 16:08:23,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-10-22 16:08:23,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2018-10-22 16:08:23,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-10-22 16:08:23,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 148 transitions. [2018-10-22 16:08:23,550 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 148 transitions. Word has length 136 [2018-10-22 16:08:23,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:23,551 INFO L481 AbstractCegarLoop]: Abstraction has 147 states and 148 transitions. [2018-10-22 16:08:23,551 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-22 16:08:23,551 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 148 transitions. [2018-10-22 16:08:23,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2018-10-22 16:08:23,552 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:23,552 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:23,552 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:23,552 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:23,552 INFO L82 PathProgramCache]: Analyzing trace with hash 720491197, now seen corresponding path program 25 times [2018-10-22 16:08:23,552 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:23,553 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:23,553 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:23,553 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:23,553 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:23,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:24,637 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-22 16:08:24,637 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:24,637 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:24,637 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:24,638 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:24,638 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:24,638 INFO L197 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 [2018-10-22 16:08:24,651 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:24,651 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:24,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:24,696 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:25,067 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-22 16:08:25,067 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:25,350 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-22 16:08:25,369 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:25,370 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 51 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:25,384 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:25,384 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:25,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:25,478 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:25,503 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-22 16:08:25,503 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:25,812 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-22 16:08:25,814 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:25,814 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 31, 31] total 45 [2018-10-22 16:08:25,814 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:25,814 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-22 16:08:25,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-22 16:08:25,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=479, Invalid=1501, Unknown=0, NotChecked=0, Total=1980 [2018-10-22 16:08:25,815 INFO L87 Difference]: Start difference. First operand 147 states and 148 transitions. Second operand 45 states. [2018-10-22 16:08:27,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:27,654 INFO L93 Difference]: Finished difference Result 214 states and 229 transitions. [2018-10-22 16:08:27,654 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-22 16:08:27,654 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 144 [2018-10-22 16:08:27,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:27,656 INFO L225 Difference]: With dead ends: 214 [2018-10-22 16:08:27,656 INFO L226 Difference]: Without dead ends: 149 [2018-10-22 16:08:27,657 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 620 GetRequests, 506 SyntacticMatches, 56 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1979 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=854, Invalid=2686, Unknown=0, NotChecked=0, Total=3540 [2018-10-22 16:08:27,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-10-22 16:08:27,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2018-10-22 16:08:27,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-10-22 16:08:27,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 150 transitions. [2018-10-22 16:08:27,666 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 150 transitions. Word has length 144 [2018-10-22 16:08:27,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:27,666 INFO L481 AbstractCegarLoop]: Abstraction has 149 states and 150 transitions. [2018-10-22 16:08:27,667 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-22 16:08:27,667 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 150 transitions. [2018-10-22 16:08:27,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-10-22 16:08:27,668 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:27,668 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:27,668 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:27,668 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:27,668 INFO L82 PathProgramCache]: Analyzing trace with hash -349719049, now seen corresponding path program 26 times [2018-10-22 16:08:27,668 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:27,669 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:27,669 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:27,669 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:27,669 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:27,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:28,012 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 235 proven. 388 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-22 16:08:28,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:28,013 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:28,013 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:28,013 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:28,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:28,013 INFO L197 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 [2018-10-22 16:08:28,021 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:28,021 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:28,063 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:28,063 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:28,065 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:28,160 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 236 proven. 351 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-22 16:08:28,160 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:28,363 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 236 proven. 351 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-22 16:08:28,383 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:28,383 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 53 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:28,398 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:28,398 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:28,503 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:28,504 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:28,511 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:28,538 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 236 proven. 351 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-22 16:08:28,539 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:28,981 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 236 proven. 351 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-22 16:08:28,982 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:28,982 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19, 19, 19] total 22 [2018-10-22 16:08:28,982 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:28,983 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 16:08:28,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 16:08:28,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=314, Unknown=0, NotChecked=0, Total=462 [2018-10-22 16:08:28,983 INFO L87 Difference]: Start difference. First operand 149 states and 150 transitions. Second operand 22 states. [2018-10-22 16:08:29,835 WARN L179 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 9 DAG size of output: 7 [2018-10-22 16:08:29,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:29,908 INFO L93 Difference]: Finished difference Result 159 states and 160 transitions. [2018-10-22 16:08:29,908 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-22 16:08:29,908 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 146 [2018-10-22 16:08:29,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:29,910 INFO L225 Difference]: With dead ends: 159 [2018-10-22 16:08:29,910 INFO L226 Difference]: Without dead ends: 157 [2018-10-22 16:08:29,911 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 619 GetRequests, 539 SyntacticMatches, 58 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 524 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=161, Invalid=391, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:08:29,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-22 16:08:29,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2018-10-22 16:08:29,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-10-22 16:08:29,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 158 transitions. [2018-10-22 16:08:29,923 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 158 transitions. Word has length 146 [2018-10-22 16:08:29,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:29,923 INFO L481 AbstractCegarLoop]: Abstraction has 157 states and 158 transitions. [2018-10-22 16:08:29,923 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 16:08:29,924 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 158 transitions. [2018-10-22 16:08:29,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2018-10-22 16:08:29,925 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:29,926 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:29,926 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:29,926 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:29,926 INFO L82 PathProgramCache]: Analyzing trace with hash -76381157, now seen corresponding path program 27 times [2018-10-22 16:08:29,926 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:29,927 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:29,927 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:29,927 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:29,927 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:29,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:30,716 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-22 16:08:30,717 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:30,717 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:30,717 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:30,717 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:30,717 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:30,717 INFO L197 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 [2018-10-22 16:08:30,724 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:30,724 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:30,773 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-22 16:08:30,774 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:30,777 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:31,228 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-22 16:08:31,229 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:31,549 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-22 16:08:31,570 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:31,570 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 55 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:31,585 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:31,585 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:31,843 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-22 16:08:31,843 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:31,849 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:31,876 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-22 16:08:31,876 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:32,469 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-22 16:08:32,471 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:32,471 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33, 33, 33] total 48 [2018-10-22 16:08:32,471 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:32,471 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-22 16:08:32,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-22 16:08:32,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=543, Invalid=1713, Unknown=0, NotChecked=0, Total=2256 [2018-10-22 16:08:32,473 INFO L87 Difference]: Start difference. First operand 157 states and 158 transitions. Second operand 48 states. [2018-10-22 16:08:33,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:33,654 INFO L93 Difference]: Finished difference Result 228 states and 244 transitions. [2018-10-22 16:08:33,655 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-22 16:08:33,655 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 154 [2018-10-22 16:08:33,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:33,656 INFO L225 Difference]: With dead ends: 228 [2018-10-22 16:08:33,656 INFO L226 Difference]: Without dead ends: 159 [2018-10-22 16:08:33,658 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 663 GetRequests, 541 SyntacticMatches, 60 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2278 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=967, Invalid=3065, Unknown=0, NotChecked=0, Total=4032 [2018-10-22 16:08:33,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2018-10-22 16:08:33,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2018-10-22 16:08:33,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-10-22 16:08:33,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 160 transitions. [2018-10-22 16:08:33,667 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 160 transitions. Word has length 154 [2018-10-22 16:08:33,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:33,667 INFO L481 AbstractCegarLoop]: Abstraction has 159 states and 160 transitions. [2018-10-22 16:08:33,667 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-22 16:08:33,667 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 160 transitions. [2018-10-22 16:08:33,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-10-22 16:08:33,668 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:33,668 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:33,668 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:33,669 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:33,669 INFO L82 PathProgramCache]: Analyzing trace with hash 1136207573, now seen corresponding path program 28 times [2018-10-22 16:08:33,669 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:33,669 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:33,670 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:33,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:33,670 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:33,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:33,939 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 267 proven. 446 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-22 16:08:33,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:33,939 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:33,939 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:33,939 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:33,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:33,939 INFO L197 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 [2018-10-22 16:08:33,947 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:33,947 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:33,994 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:33,994 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:33,996 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:34,062 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 268 proven. 406 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-22 16:08:34,062 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:34,419 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 268 proven. 406 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-22 16:08:34,440 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:34,440 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 57 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:34,454 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:34,454 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:34,574 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:34,574 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:34,580 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:34,599 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 268 proven. 406 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-22 16:08:34,599 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:34,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 268 proven. 406 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-22 16:08:34,847 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:34,848 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20, 20, 20] total 23 [2018-10-22 16:08:34,848 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:34,848 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-22 16:08:34,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-22 16:08:34,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=341, Unknown=0, NotChecked=0, Total=506 [2018-10-22 16:08:34,849 INFO L87 Difference]: Start difference. First operand 159 states and 160 transitions. Second operand 23 states. [2018-10-22 16:08:35,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:35,379 INFO L93 Difference]: Finished difference Result 169 states and 170 transitions. [2018-10-22 16:08:35,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 16:08:35,379 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 156 [2018-10-22 16:08:35,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:35,382 INFO L225 Difference]: With dead ends: 169 [2018-10-22 16:08:35,382 INFO L226 Difference]: Without dead ends: 167 [2018-10-22 16:08:35,382 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 661 GetRequests, 576 SyntacticMatches, 62 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 591 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=178, Invalid=422, Unknown=0, NotChecked=0, Total=600 [2018-10-22 16:08:35,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2018-10-22 16:08:35,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 167. [2018-10-22 16:08:35,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-22 16:08:35,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 168 transitions. [2018-10-22 16:08:35,390 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 168 transitions. Word has length 156 [2018-10-22 16:08:35,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:35,391 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 168 transitions. [2018-10-22 16:08:35,391 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-22 16:08:35,391 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 168 transitions. [2018-10-22 16:08:35,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-10-22 16:08:35,392 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:35,392 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:35,392 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:35,392 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:35,393 INFO L82 PathProgramCache]: Analyzing trace with hash -1226033415, now seen corresponding path program 29 times [2018-10-22 16:08:35,393 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:35,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:35,393 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:35,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:35,394 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:35,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:36,017 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-22 16:08:36,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:36,017 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:36,017 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:36,017 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:36,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:36,018 INFO L197 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 [2018-10-22 16:08:36,042 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:36,042 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:36,102 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2018-10-22 16:08:36,102 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:36,106 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:36,621 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-22 16:08:36,621 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:36,979 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-22 16:08:37,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:37,010 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 59 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:37,033 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:37,033 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:37,337 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2018-10-22 16:08:37,338 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:37,343 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:37,383 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-22 16:08:37,383 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:37,863 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-22 16:08:37,864 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:37,864 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35, 35, 35] total 51 [2018-10-22 16:08:37,864 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:37,865 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-22 16:08:37,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-22 16:08:37,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=611, Invalid=1939, Unknown=0, NotChecked=0, Total=2550 [2018-10-22 16:08:37,866 INFO L87 Difference]: Start difference. First operand 167 states and 168 transitions. Second operand 51 states. [2018-10-22 16:08:38,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:38,927 INFO L93 Difference]: Finished difference Result 242 states and 259 transitions. [2018-10-22 16:08:38,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-22 16:08:38,934 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 164 [2018-10-22 16:08:38,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:38,935 INFO L225 Difference]: With dead ends: 242 [2018-10-22 16:08:38,935 INFO L226 Difference]: Without dead ends: 169 [2018-10-22 16:08:38,938 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 706 GetRequests, 576 SyntacticMatches, 64 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2598 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1087, Invalid=3469, Unknown=0, NotChecked=0, Total=4556 [2018-10-22 16:08:38,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-10-22 16:08:38,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-10-22 16:08:38,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-10-22 16:08:38,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2018-10-22 16:08:38,947 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 164 [2018-10-22 16:08:38,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:38,947 INFO L481 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2018-10-22 16:08:38,947 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-22 16:08:38,947 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2018-10-22 16:08:38,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2018-10-22 16:08:38,948 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:38,948 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:38,949 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:38,949 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:38,949 INFO L82 PathProgramCache]: Analyzing trace with hash -956679885, now seen corresponding path program 30 times [2018-10-22 16:08:38,949 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:38,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:38,950 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:38,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:38,950 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:38,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:39,563 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 301 proven. 508 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-22 16:08:39,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:39,564 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:39,564 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:39,564 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:39,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:39,564 INFO L197 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 [2018-10-22 16:08:39,571 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:39,572 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:39,629 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 17 check-sat command(s) [2018-10-22 16:08:39,629 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:39,631 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:40,117 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 302 proven. 465 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-22 16:08:40,117 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:40,416 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 302 proven. 465 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-22 16:08:40,435 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:40,435 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 61 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:40,452 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:40,452 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:40,760 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 17 check-sat command(s) [2018-10-22 16:08:40,760 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:40,767 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:40,796 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 302 proven. 465 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-22 16:08:40,797 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:42,075 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 302 proven. 465 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-22 16:08:42,077 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:42,077 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21, 21, 21] total 24 [2018-10-22 16:08:42,077 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:42,078 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-22 16:08:42,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-22 16:08:42,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=369, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:08:42,079 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand 24 states. [2018-10-22 16:08:42,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:42,359 INFO L93 Difference]: Finished difference Result 179 states and 180 transitions. [2018-10-22 16:08:42,359 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-22 16:08:42,359 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 166 [2018-10-22 16:08:42,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:42,361 INFO L225 Difference]: With dead ends: 179 [2018-10-22 16:08:42,361 INFO L226 Difference]: Without dead ends: 177 [2018-10-22 16:08:42,361 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 703 GetRequests, 613 SyntacticMatches, 66 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 662 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=196, Invalid=454, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:08:42,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-10-22 16:08:42,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 177. [2018-10-22 16:08:42,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-10-22 16:08:42,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 178 transitions. [2018-10-22 16:08:42,370 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 178 transitions. Word has length 166 [2018-10-22 16:08:42,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:42,371 INFO L481 AbstractCegarLoop]: Abstraction has 177 states and 178 transitions. [2018-10-22 16:08:42,371 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-22 16:08:42,371 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 178 transitions. [2018-10-22 16:08:42,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-10-22 16:08:42,372 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:42,372 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:42,373 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:42,373 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:42,373 INFO L82 PathProgramCache]: Analyzing trace with hash -1441002665, now seen corresponding path program 31 times [2018-10-22 16:08:42,373 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:42,374 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:42,374 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:42,374 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:42,374 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:42,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:43,274 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-22 16:08:43,274 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:43,274 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:43,274 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:43,275 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:43,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:43,275 INFO L197 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 [2018-10-22 16:08:43,282 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:43,282 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:43,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:43,332 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:43,921 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-22 16:08:43,921 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:44,321 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-22 16:08:44,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:44,341 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 63 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:44,355 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:44,355 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:44,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:44,464 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:44,509 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-22 16:08:44,509 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:45,085 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-22 16:08:45,086 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:45,086 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37, 37, 37] total 54 [2018-10-22 16:08:45,087 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:45,087 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-22 16:08:45,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-22 16:08:45,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=683, Invalid=2179, Unknown=0, NotChecked=0, Total=2862 [2018-10-22 16:08:45,088 INFO L87 Difference]: Start difference. First operand 177 states and 178 transitions. Second operand 54 states. [2018-10-22 16:08:46,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:46,117 INFO L93 Difference]: Finished difference Result 256 states and 274 transitions. [2018-10-22 16:08:46,118 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-22 16:08:46,118 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 174 [2018-10-22 16:08:46,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:46,119 INFO L225 Difference]: With dead ends: 256 [2018-10-22 16:08:46,119 INFO L226 Difference]: Without dead ends: 179 [2018-10-22 16:08:46,121 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 749 GetRequests, 611 SyntacticMatches, 68 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2939 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1214, Invalid=3898, Unknown=0, NotChecked=0, Total=5112 [2018-10-22 16:08:46,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2018-10-22 16:08:46,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2018-10-22 16:08:46,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2018-10-22 16:08:46,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 180 transitions. [2018-10-22 16:08:46,130 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 180 transitions. Word has length 174 [2018-10-22 16:08:46,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:46,130 INFO L481 AbstractCegarLoop]: Abstraction has 179 states and 180 transitions. [2018-10-22 16:08:46,130 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-22 16:08:46,130 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 180 transitions. [2018-10-22 16:08:46,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-10-22 16:08:46,131 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:46,131 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:46,131 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:46,131 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:46,131 INFO L82 PathProgramCache]: Analyzing trace with hash 98569489, now seen corresponding path program 32 times [2018-10-22 16:08:46,131 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:46,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:46,132 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:46,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:46,132 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:46,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:46,438 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 337 proven. 574 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-22 16:08:46,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:46,439 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:46,439 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:46,439 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:46,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:46,439 INFO L197 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 [2018-10-22 16:08:46,447 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:46,447 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:46,492 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:46,492 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:46,495 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:46,563 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 338 proven. 528 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-22 16:08:46,564 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:46,898 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 338 proven. 528 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-22 16:08:46,918 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:46,918 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 65 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:46,933 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:46,933 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:47,042 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:47,042 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:47,048 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:47,075 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 338 proven. 528 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-22 16:08:47,075 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:47,439 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 338 proven. 528 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-22 16:08:47,441 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:47,441 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22, 22, 22] total 25 [2018-10-22 16:08:47,441 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:47,441 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-22 16:08:47,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-22 16:08:47,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=398, Unknown=0, NotChecked=0, Total=600 [2018-10-22 16:08:47,442 INFO L87 Difference]: Start difference. First operand 179 states and 180 transitions. Second operand 25 states. [2018-10-22 16:08:47,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:47,793 INFO L93 Difference]: Finished difference Result 189 states and 190 transitions. [2018-10-22 16:08:47,793 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-22 16:08:47,793 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 176 [2018-10-22 16:08:47,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:47,794 INFO L225 Difference]: With dead ends: 189 [2018-10-22 16:08:47,794 INFO L226 Difference]: Without dead ends: 187 [2018-10-22 16:08:47,794 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 745 GetRequests, 650 SyntacticMatches, 70 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 737 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=215, Invalid=487, Unknown=0, NotChecked=0, Total=702 [2018-10-22 16:08:47,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-22 16:08:47,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2018-10-22 16:08:47,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-10-22 16:08:47,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 188 transitions. [2018-10-22 16:08:47,803 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 188 transitions. Word has length 176 [2018-10-22 16:08:47,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:47,803 INFO L481 AbstractCegarLoop]: Abstraction has 187 states and 188 transitions. [2018-10-22 16:08:47,804 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-22 16:08:47,804 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 188 transitions. [2018-10-22 16:08:47,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2018-10-22 16:08:47,805 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:47,805 INFO L375 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:47,805 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:47,805 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:47,806 INFO L82 PathProgramCache]: Analyzing trace with hash 785850677, now seen corresponding path program 33 times [2018-10-22 16:08:47,806 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:47,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:47,806 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:47,807 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:47,807 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:47,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:48,429 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-22 16:08:48,429 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:48,429 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:48,429 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:48,429 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:48,429 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:48,429 INFO L197 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 [2018-10-22 16:08:48,438 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:48,438 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:48,503 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-22 16:08:48,504 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:48,508 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:49,158 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-22 16:08:49,158 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:49,594 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-22 16:08:49,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:49,615 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 67 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:49,629 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:49,629 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:49,990 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-22 16:08:49,990 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:49,996 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:50,032 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-22 16:08:50,033 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:50,490 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-22 16:08:50,491 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:50,491 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39, 39, 39] total 57 [2018-10-22 16:08:50,492 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:50,492 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-22 16:08:50,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-22 16:08:50,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=759, Invalid=2433, Unknown=0, NotChecked=0, Total=3192 [2018-10-22 16:08:50,493 INFO L87 Difference]: Start difference. First operand 187 states and 188 transitions. Second operand 57 states. [2018-10-22 16:08:51,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:51,321 INFO L93 Difference]: Finished difference Result 270 states and 289 transitions. [2018-10-22 16:08:51,322 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-22 16:08:51,322 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 184 [2018-10-22 16:08:51,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:51,323 INFO L225 Difference]: With dead ends: 270 [2018-10-22 16:08:51,323 INFO L226 Difference]: Without dead ends: 189 [2018-10-22 16:08:51,324 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 792 GetRequests, 646 SyntacticMatches, 72 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3301 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1348, Invalid=4352, Unknown=0, NotChecked=0, Total=5700 [2018-10-22 16:08:51,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2018-10-22 16:08:51,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 189. [2018-10-22 16:08:51,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-10-22 16:08:51,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 190 transitions. [2018-10-22 16:08:51,333 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 190 transitions. Word has length 184 [2018-10-22 16:08:51,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:51,334 INFO L481 AbstractCegarLoop]: Abstraction has 189 states and 190 transitions. [2018-10-22 16:08:51,334 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-22 16:08:51,334 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 190 transitions. [2018-10-22 16:08:51,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-10-22 16:08:51,335 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:51,335 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:51,335 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:51,336 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:51,336 INFO L82 PathProgramCache]: Analyzing trace with hash -1200110993, now seen corresponding path program 34 times [2018-10-22 16:08:51,336 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:51,337 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:51,337 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:51,337 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:51,337 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:51,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:51,807 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 375 proven. 644 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-22 16:08:51,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:51,807 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:51,807 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:51,807 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:51,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:51,808 INFO L197 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 [2018-10-22 16:08:51,814 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:51,814 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:51,869 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:51,869 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:51,873 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:52,344 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 376 proven. 595 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-22 16:08:52,345 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:53,036 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 376 proven. 595 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-22 16:08:53,056 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:53,056 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 69 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:53,071 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:53,071 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:53,204 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:53,204 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:53,210 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:53,234 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 376 proven. 595 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-22 16:08:53,235 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:53,694 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 376 proven. 595 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-22 16:08:53,695 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:53,695 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23, 23, 23] total 26 [2018-10-22 16:08:53,696 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:53,696 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-22 16:08:53,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-22 16:08:53,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=428, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:08:53,696 INFO L87 Difference]: Start difference. First operand 189 states and 190 transitions. Second operand 26 states. [2018-10-22 16:08:53,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:53,933 INFO L93 Difference]: Finished difference Result 199 states and 200 transitions. [2018-10-22 16:08:53,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-22 16:08:53,934 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 186 [2018-10-22 16:08:53,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:53,936 INFO L225 Difference]: With dead ends: 199 [2018-10-22 16:08:53,936 INFO L226 Difference]: Without dead ends: 197 [2018-10-22 16:08:53,937 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 787 GetRequests, 687 SyntacticMatches, 74 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 816 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=235, Invalid=521, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:08:53,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-10-22 16:08:53,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 197. [2018-10-22 16:08:53,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2018-10-22 16:08:53,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 198 transitions. [2018-10-22 16:08:53,945 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 198 transitions. Word has length 186 [2018-10-22 16:08:53,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:53,946 INFO L481 AbstractCegarLoop]: Abstraction has 197 states and 198 transitions. [2018-10-22 16:08:53,946 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-22 16:08:53,946 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 198 transitions. [2018-10-22 16:08:53,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-10-22 16:08:53,947 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:53,947 INFO L375 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 19, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:53,947 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:53,947 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:53,948 INFO L82 PathProgramCache]: Analyzing trace with hash 772446355, now seen corresponding path program 35 times [2018-10-22 16:08:53,948 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:53,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:53,948 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:53,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:53,949 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:53,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:55,538 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-22 16:08:55,538 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:55,538 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:55,538 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:55,538 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:55,538 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:55,538 INFO L197 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 [2018-10-22 16:08:55,546 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:55,546 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:55,613 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2018-10-22 16:08:55,613 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:55,617 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:56,264 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-22 16:08:56,265 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:56,794 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-22 16:08:56,814 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:56,814 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 71 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:56,830 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:56,830 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:57,224 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2018-10-22 16:08:57,224 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:57,231 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:57,289 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-22 16:08:57,289 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:58,211 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-22 16:08:58,213 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:58,213 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41, 41, 41] total 60 [2018-10-22 16:08:58,213 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:58,214 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-22 16:08:58,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-22 16:08:58,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=839, Invalid=2701, Unknown=0, NotChecked=0, Total=3540 [2018-10-22 16:08:58,215 INFO L87 Difference]: Start difference. First operand 197 states and 198 transitions. Second operand 60 states. [2018-10-22 16:08:59,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:59,293 INFO L93 Difference]: Finished difference Result 284 states and 304 transitions. [2018-10-22 16:08:59,300 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-22 16:08:59,300 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 194 [2018-10-22 16:08:59,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:59,301 INFO L225 Difference]: With dead ends: 284 [2018-10-22 16:08:59,301 INFO L226 Difference]: Without dead ends: 199 [2018-10-22 16:08:59,303 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 835 GetRequests, 681 SyntacticMatches, 76 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3684 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=1489, Invalid=4831, Unknown=0, NotChecked=0, Total=6320 [2018-10-22 16:08:59,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-10-22 16:08:59,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 199. [2018-10-22 16:08:59,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2018-10-22 16:08:59,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 200 transitions. [2018-10-22 16:08:59,315 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 200 transitions. Word has length 194 [2018-10-22 16:08:59,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:59,315 INFO L481 AbstractCegarLoop]: Abstraction has 199 states and 200 transitions. [2018-10-22 16:08:59,315 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-22 16:08:59,316 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 200 transitions. [2018-10-22 16:08:59,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2018-10-22 16:08:59,317 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:59,317 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:59,317 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:59,317 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:59,317 INFO L82 PathProgramCache]: Analyzing trace with hash -1075414707, now seen corresponding path program 36 times [2018-10-22 16:08:59,318 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:59,318 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:59,318 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:59,318 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:59,318 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:59,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:59,707 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 415 proven. 718 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-22 16:08:59,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:59,708 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:59,708 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:59,708 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:59,708 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:59,708 INFO L197 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 [2018-10-22 16:08:59,716 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:59,716 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:59,789 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2018-10-22 16:08:59,789 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:59,792 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:59,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 416 proven. 666 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-22 16:08:59,847 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:00,234 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 416 proven. 666 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-22 16:09:00,254 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:00,255 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 73 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:00,269 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:00,270 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:00,701 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2018-10-22 16:09:00,701 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:00,711 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:00,739 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 416 proven. 666 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-22 16:09:00,739 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:01,109 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 416 proven. 666 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-22 16:09:01,110 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:01,111 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24, 24, 24] total 27 [2018-10-22 16:09:01,111 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:01,111 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-22 16:09:01,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-22 16:09:01,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=459, Unknown=0, NotChecked=0, Total=702 [2018-10-22 16:09:01,112 INFO L87 Difference]: Start difference. First operand 199 states and 200 transitions. Second operand 27 states. [2018-10-22 16:09:01,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:01,362 INFO L93 Difference]: Finished difference Result 209 states and 210 transitions. [2018-10-22 16:09:01,363 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-22 16:09:01,363 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 196 [2018-10-22 16:09:01,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:01,365 INFO L225 Difference]: With dead ends: 209 [2018-10-22 16:09:01,365 INFO L226 Difference]: Without dead ends: 207 [2018-10-22 16:09:01,365 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 829 GetRequests, 724 SyntacticMatches, 78 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 899 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=256, Invalid=556, Unknown=0, NotChecked=0, Total=812 [2018-10-22 16:09:01,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2018-10-22 16:09:01,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2018-10-22 16:09:01,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-10-22 16:09:01,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 208 transitions. [2018-10-22 16:09:01,375 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 208 transitions. Word has length 196 [2018-10-22 16:09:01,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:01,376 INFO L481 AbstractCegarLoop]: Abstraction has 207 states and 208 transitions. [2018-10-22 16:09:01,376 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-22 16:09:01,376 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 208 transitions. [2018-10-22 16:09:01,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-10-22 16:09:01,377 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:01,377 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:01,377 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:01,378 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:01,378 INFO L82 PathProgramCache]: Analyzing trace with hash 565940593, now seen corresponding path program 37 times [2018-10-22 16:09:01,378 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:01,379 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:01,379 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:01,379 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:01,379 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:01,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:02,360 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-22 16:09:02,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:02,361 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:02,361 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:02,361 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:02,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:02,361 INFO L197 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 [2018-10-22 16:09:02,369 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:02,369 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:02,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:02,428 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:03,362 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-22 16:09:03,362 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:04,016 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-22 16:09:04,036 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:04,036 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 75 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:04,051 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:04,051 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:04,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:04,182 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:04,226 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-22 16:09:04,226 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:04,810 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-22 16:09:04,812 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:04,812 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43, 43, 43] total 63 [2018-10-22 16:09:04,812 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:04,812 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-10-22 16:09:04,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-10-22 16:09:04,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=923, Invalid=2983, Unknown=0, NotChecked=0, Total=3906 [2018-10-22 16:09:04,813 INFO L87 Difference]: Start difference. First operand 207 states and 208 transitions. Second operand 63 states. [2018-10-22 16:09:06,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:06,091 INFO L93 Difference]: Finished difference Result 298 states and 319 transitions. [2018-10-22 16:09:06,092 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-22 16:09:06,092 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 204 [2018-10-22 16:09:06,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:06,094 INFO L225 Difference]: With dead ends: 298 [2018-10-22 16:09:06,094 INFO L226 Difference]: Without dead ends: 209 [2018-10-22 16:09:06,095 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 878 GetRequests, 716 SyntacticMatches, 80 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4088 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1637, Invalid=5335, Unknown=0, NotChecked=0, Total=6972 [2018-10-22 16:09:06,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2018-10-22 16:09:06,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 209. [2018-10-22 16:09:06,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2018-10-22 16:09:06,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 210 transitions. [2018-10-22 16:09:06,102 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 210 transitions. Word has length 204 [2018-10-22 16:09:06,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:06,102 INFO L481 AbstractCegarLoop]: Abstraction has 209 states and 210 transitions. [2018-10-22 16:09:06,102 INFO L482 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-10-22 16:09:06,102 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 210 transitions. [2018-10-22 16:09:06,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-10-22 16:09:06,103 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:06,103 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:06,104 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:06,104 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:06,104 INFO L82 PathProgramCache]: Analyzing trace with hash -1469492821, now seen corresponding path program 38 times [2018-10-22 16:09:06,104 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:06,104 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:06,105 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:06,105 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:06,105 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:06,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:07,268 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 457 proven. 796 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:09:07,268 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:07,268 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:07,268 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:07,268 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:07,268 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:07,268 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:07,277 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:07,278 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:07,333 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:07,333 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:07,336 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:07,413 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 458 proven. 741 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-22 16:09:07,413 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:07,799 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 458 proven. 741 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-22 16:09:07,820 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:07,820 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 77 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:07,834 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:07,835 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:07,969 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:07,969 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:07,977 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:08,019 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 458 proven. 741 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-22 16:09:08,019 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:08,640 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 458 proven. 741 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-22 16:09:08,641 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:08,642 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25, 25, 25] total 28 [2018-10-22 16:09:08,642 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:08,642 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-22 16:09:08,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-22 16:09:08,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=491, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:09:08,643 INFO L87 Difference]: Start difference. First operand 209 states and 210 transitions. Second operand 28 states. [2018-10-22 16:09:08,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:08,954 INFO L93 Difference]: Finished difference Result 219 states and 220 transitions. [2018-10-22 16:09:08,954 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-22 16:09:08,955 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 206 [2018-10-22 16:09:08,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:08,956 INFO L225 Difference]: With dead ends: 219 [2018-10-22 16:09:08,957 INFO L226 Difference]: Without dead ends: 217 [2018-10-22 16:09:08,957 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 871 GetRequests, 761 SyntacticMatches, 82 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 986 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=278, Invalid=592, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:09:08,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2018-10-22 16:09:08,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 217. [2018-10-22 16:09:08,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2018-10-22 16:09:08,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 218 transitions. [2018-10-22 16:09:08,967 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 218 transitions. Word has length 206 [2018-10-22 16:09:08,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:08,967 INFO L481 AbstractCegarLoop]: Abstraction has 217 states and 218 transitions. [2018-10-22 16:09:08,967 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-22 16:09:08,968 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 218 transitions. [2018-10-22 16:09:08,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2018-10-22 16:09:08,969 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:08,969 INFO L375 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 21, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:08,969 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:08,969 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:08,969 INFO L82 PathProgramCache]: Analyzing trace with hash -1761137713, now seen corresponding path program 39 times [2018-10-22 16:09:08,970 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:08,970 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:08,970 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:08,970 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:08,971 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:08,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:11,241 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-22 16:09:11,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:11,242 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:11,242 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:11,242 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:11,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:11,242 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:11,249 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:11,250 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:11,327 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-22 16:09:11,328 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:11,331 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:12,107 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-22 16:09:12,107 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:12,706 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-22 16:09:12,726 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:12,726 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 79 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:12,741 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:12,741 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:13,240 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-22 16:09:13,240 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:13,248 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:13,297 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-22 16:09:13,297 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:14,035 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-22 16:09:14,036 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:14,037 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45, 45, 45] total 66 [2018-10-22 16:09:14,037 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:14,037 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-10-22 16:09:14,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-10-22 16:09:14,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1011, Invalid=3279, Unknown=0, NotChecked=0, Total=4290 [2018-10-22 16:09:14,038 INFO L87 Difference]: Start difference. First operand 217 states and 218 transitions. Second operand 66 states. [2018-10-22 16:09:15,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:15,478 INFO L93 Difference]: Finished difference Result 312 states and 334 transitions. [2018-10-22 16:09:15,478 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-22 16:09:15,478 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 214 [2018-10-22 16:09:15,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:15,480 INFO L225 Difference]: With dead ends: 312 [2018-10-22 16:09:15,480 INFO L226 Difference]: Without dead ends: 219 [2018-10-22 16:09:15,481 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 921 GetRequests, 751 SyntacticMatches, 84 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4513 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=1792, Invalid=5864, Unknown=0, NotChecked=0, Total=7656 [2018-10-22 16:09:15,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-10-22 16:09:15,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2018-10-22 16:09:15,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2018-10-22 16:09:15,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 220 transitions. [2018-10-22 16:09:15,492 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 220 transitions. Word has length 214 [2018-10-22 16:09:15,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:15,492 INFO L481 AbstractCegarLoop]: Abstraction has 219 states and 220 transitions. [2018-10-22 16:09:15,492 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-10-22 16:09:15,492 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 220 transitions. [2018-10-22 16:09:15,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2018-10-22 16:09:15,494 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:15,494 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:15,494 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:15,494 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:15,495 INFO L82 PathProgramCache]: Analyzing trace with hash -1420465271, now seen corresponding path program 40 times [2018-10-22 16:09:15,495 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:15,495 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:15,495 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:15,496 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:15,496 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:15,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:17,296 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 501 proven. 878 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2018-10-22 16:09:17,296 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:17,296 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:17,296 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:17,296 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:17,296 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:17,296 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:17,304 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:17,304 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:17,367 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:17,368 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:17,371 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:17,474 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 502 proven. 820 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-22 16:09:17,474 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:17,897 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 502 proven. 820 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-22 16:09:17,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:17,917 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 81 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:17,932 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:17,932 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:18,096 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:18,096 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:18,103 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:18,137 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 502 proven. 820 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-22 16:09:18,137 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:18,836 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 502 proven. 820 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-22 16:09:18,838 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:18,838 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26, 26, 26] total 29 [2018-10-22 16:09:18,838 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:18,839 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-22 16:09:18,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-22 16:09:18,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=524, Unknown=0, NotChecked=0, Total=812 [2018-10-22 16:09:18,839 INFO L87 Difference]: Start difference. First operand 219 states and 220 transitions. Second operand 29 states. [2018-10-22 16:09:19,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:19,156 INFO L93 Difference]: Finished difference Result 229 states and 230 transitions. [2018-10-22 16:09:19,156 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-22 16:09:19,157 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 216 [2018-10-22 16:09:19,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:19,159 INFO L225 Difference]: With dead ends: 229 [2018-10-22 16:09:19,159 INFO L226 Difference]: Without dead ends: 227 [2018-10-22 16:09:19,160 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 913 GetRequests, 798 SyntacticMatches, 86 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1077 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=301, Invalid=629, Unknown=0, NotChecked=0, Total=930 [2018-10-22 16:09:19,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2018-10-22 16:09:19,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 227. [2018-10-22 16:09:19,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 227 states. [2018-10-22 16:09:19,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 228 transitions. [2018-10-22 16:09:19,170 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 228 transitions. Word has length 216 [2018-10-22 16:09:19,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:19,170 INFO L481 AbstractCegarLoop]: Abstraction has 227 states and 228 transitions. [2018-10-22 16:09:19,170 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-22 16:09:19,170 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 228 transitions. [2018-10-22 16:09:19,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2018-10-22 16:09:19,171 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:19,172 INFO L375 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:19,172 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:19,172 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:19,172 INFO L82 PathProgramCache]: Analyzing trace with hash 807569325, now seen corresponding path program 41 times [2018-10-22 16:09:19,172 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:19,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:19,173 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:19,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:19,173 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:19,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:20,675 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-22 16:09:20,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:20,675 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:20,675 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:20,675 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:20,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:20,675 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:20,686 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:20,686 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:20,772 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2018-10-22 16:09:20,772 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:20,776 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:21,642 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-22 16:09:21,642 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:22,370 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-22 16:09:22,390 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:22,390 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 83 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:22,426 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:22,426 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:22,960 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2018-10-22 16:09:22,960 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:22,968 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:23,019 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-22 16:09:23,019 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:24,039 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-22 16:09:24,041 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:24,041 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47, 47, 47] total 69 [2018-10-22 16:09:24,041 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:24,042 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-10-22 16:09:24,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-10-22 16:09:24,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1103, Invalid=3589, Unknown=0, NotChecked=0, Total=4692 [2018-10-22 16:09:24,043 INFO L87 Difference]: Start difference. First operand 227 states and 228 transitions. Second operand 69 states. [2018-10-22 16:09:25,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:25,430 INFO L93 Difference]: Finished difference Result 326 states and 349 transitions. [2018-10-22 16:09:25,430 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-22 16:09:25,431 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 224 [2018-10-22 16:09:25,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:25,432 INFO L225 Difference]: With dead ends: 326 [2018-10-22 16:09:25,432 INFO L226 Difference]: Without dead ends: 229 [2018-10-22 16:09:25,433 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 964 GetRequests, 786 SyntacticMatches, 88 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4959 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=1954, Invalid=6418, Unknown=0, NotChecked=0, Total=8372 [2018-10-22 16:09:25,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2018-10-22 16:09:25,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 229. [2018-10-22 16:09:25,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2018-10-22 16:09:25,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 230 transitions. [2018-10-22 16:09:25,444 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 230 transitions. Word has length 224 [2018-10-22 16:09:25,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:25,445 INFO L481 AbstractCegarLoop]: Abstraction has 229 states and 230 transitions. [2018-10-22 16:09:25,445 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-10-22 16:09:25,445 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 230 transitions. [2018-10-22 16:09:25,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2018-10-22 16:09:25,446 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:25,447 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:25,447 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:25,447 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:25,447 INFO L82 PathProgramCache]: Analyzing trace with hash 823650023, now seen corresponding path program 42 times [2018-10-22 16:09:25,447 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:25,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:25,448 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:25,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:25,448 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:25,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:26,218 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 547 proven. 964 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2018-10-22 16:09:26,219 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:26,219 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:26,219 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:26,219 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:26,219 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:26,219 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:26,226 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:26,227 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:26,320 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 23 check-sat command(s) [2018-10-22 16:09:26,320 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:26,324 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:26,407 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 548 proven. 903 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-22 16:09:26,407 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:27,356 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 548 proven. 903 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-22 16:09:27,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:27,376 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 85 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:27,391 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:27,391 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:27,957 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 23 check-sat command(s) [2018-10-22 16:09:27,957 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:27,966 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:28,013 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 548 proven. 903 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-22 16:09:28,014 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:29,008 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 548 proven. 903 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-22 16:09:29,010 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:29,010 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27, 27, 27] total 30 [2018-10-22 16:09:29,010 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:29,011 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-22 16:09:29,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-22 16:09:29,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=558, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:09:29,012 INFO L87 Difference]: Start difference. First operand 229 states and 230 transitions. Second operand 30 states. [2018-10-22 16:09:29,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:29,336 INFO L93 Difference]: Finished difference Result 239 states and 240 transitions. [2018-10-22 16:09:29,337 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-22 16:09:29,337 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 226 [2018-10-22 16:09:29,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:29,339 INFO L225 Difference]: With dead ends: 239 [2018-10-22 16:09:29,339 INFO L226 Difference]: Without dead ends: 237 [2018-10-22 16:09:29,339 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 955 GetRequests, 835 SyntacticMatches, 90 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1172 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=325, Invalid=667, Unknown=0, NotChecked=0, Total=992 [2018-10-22 16:09:29,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2018-10-22 16:09:29,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 237. [2018-10-22 16:09:29,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 237 states. [2018-10-22 16:09:29,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 238 transitions. [2018-10-22 16:09:29,350 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 238 transitions. Word has length 226 [2018-10-22 16:09:29,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:29,351 INFO L481 AbstractCegarLoop]: Abstraction has 237 states and 238 transitions. [2018-10-22 16:09:29,351 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-22 16:09:29,351 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 238 transitions. [2018-10-22 16:09:29,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2018-10-22 16:09:29,352 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:29,352 INFO L375 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 23, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:29,353 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:29,353 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:29,353 INFO L82 PathProgramCache]: Analyzing trace with hash 643482891, now seen corresponding path program 43 times [2018-10-22 16:09:29,353 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:29,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:29,354 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:29,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:29,354 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:29,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:30,631 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-22 16:09:30,631 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:30,631 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:30,631 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:30,632 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:30,632 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:30,632 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:30,640 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:30,640 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:30,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:30,710 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:31,662 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-22 16:09:31,663 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:32,372 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-22 16:09:32,392 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:32,392 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 87 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:32,407 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:32,407 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:32,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:32,556 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:32,636 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-22 16:09:32,637 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:33,444 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-22 16:09:33,445 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:33,446 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49, 49, 49] total 72 [2018-10-22 16:09:33,446 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:33,446 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-10-22 16:09:33,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-10-22 16:09:33,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1199, Invalid=3913, Unknown=0, NotChecked=0, Total=5112 [2018-10-22 16:09:33,447 INFO L87 Difference]: Start difference. First operand 237 states and 238 transitions. Second operand 72 states. [2018-10-22 16:09:34,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:34,928 INFO L93 Difference]: Finished difference Result 340 states and 364 transitions. [2018-10-22 16:09:34,929 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-22 16:09:34,929 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 234 [2018-10-22 16:09:34,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:34,930 INFO L225 Difference]: With dead ends: 340 [2018-10-22 16:09:34,930 INFO L226 Difference]: Without dead ends: 239 [2018-10-22 16:09:34,932 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1007 GetRequests, 821 SyntacticMatches, 92 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5426 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=2123, Invalid=6997, Unknown=0, NotChecked=0, Total=9120 [2018-10-22 16:09:34,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2018-10-22 16:09:34,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 239. [2018-10-22 16:09:34,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2018-10-22 16:09:34,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 240 transitions. [2018-10-22 16:09:34,942 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 240 transitions. Word has length 234 [2018-10-22 16:09:34,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:34,942 INFO L481 AbstractCegarLoop]: Abstraction has 239 states and 240 transitions. [2018-10-22 16:09:34,942 INFO L482 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-10-22 16:09:34,942 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 240 transitions. [2018-10-22 16:09:34,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2018-10-22 16:09:34,944 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:34,944 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:34,944 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:34,944 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:34,944 INFO L82 PathProgramCache]: Analyzing trace with hash -751443003, now seen corresponding path program 44 times [2018-10-22 16:09:34,944 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:34,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:34,945 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:34,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:34,945 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:34,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:35,448 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 595 proven. 1054 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:35,448 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:35,448 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:35,448 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:35,448 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:35,448 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:35,448 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:35,456 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:35,456 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:35,525 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:35,525 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:35,529 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:35,617 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 596 proven. 990 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-22 16:09:35,617 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:36,126 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 596 proven. 990 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-22 16:09:36,146 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:36,146 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 89 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:36,161 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:36,161 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:36,314 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:36,314 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:36,323 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:36,361 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 596 proven. 990 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-22 16:09:36,361 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:36,866 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 596 proven. 990 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-22 16:09:36,867 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:36,868 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28, 28, 28] total 31 [2018-10-22 16:09:36,868 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:36,868 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-22 16:09:36,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-22 16:09:36,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=593, Unknown=0, NotChecked=0, Total=930 [2018-10-22 16:09:36,869 INFO L87 Difference]: Start difference. First operand 239 states and 240 transitions. Second operand 31 states. [2018-10-22 16:09:37,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:37,206 INFO L93 Difference]: Finished difference Result 249 states and 250 transitions. [2018-10-22 16:09:37,206 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-22 16:09:37,206 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 236 [2018-10-22 16:09:37,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:37,209 INFO L225 Difference]: With dead ends: 249 [2018-10-22 16:09:37,209 INFO L226 Difference]: Without dead ends: 247 [2018-10-22 16:09:37,210 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 997 GetRequests, 872 SyntacticMatches, 94 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1271 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=350, Invalid=706, Unknown=0, NotChecked=0, Total=1056 [2018-10-22 16:09:37,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-10-22 16:09:37,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 247. [2018-10-22 16:09:37,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2018-10-22 16:09:37,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 248 transitions. [2018-10-22 16:09:37,220 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 248 transitions. Word has length 236 [2018-10-22 16:09:37,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:37,220 INFO L481 AbstractCegarLoop]: Abstraction has 247 states and 248 transitions. [2018-10-22 16:09:37,220 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-22 16:09:37,220 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 248 transitions. [2018-10-22 16:09:37,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2018-10-22 16:09:37,222 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:37,222 INFO L375 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 24, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:37,222 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:37,222 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:37,222 INFO L82 PathProgramCache]: Analyzing trace with hash 1276445673, now seen corresponding path program 45 times [2018-10-22 16:09:37,223 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:37,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:37,223 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:37,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:37,223 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:37,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:38,143 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-22 16:09:38,143 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:38,143 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:38,143 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:38,143 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:38,143 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:38,144 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:38,152 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:38,153 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:38,242 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-22 16:09:38,243 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:38,247 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:39,512 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-22 16:09:39,512 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:40,273 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-22 16:09:40,294 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:40,294 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 91 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 91 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:40,308 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:40,308 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:40,912 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-22 16:09:40,912 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:40,920 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:40,980 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-22 16:09:40,980 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:41,767 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-22 16:09:41,768 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:41,769 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51, 51, 51] total 75 [2018-10-22 16:09:41,769 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:41,769 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-10-22 16:09:41,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-10-22 16:09:41,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1299, Invalid=4251, Unknown=0, NotChecked=0, Total=5550 [2018-10-22 16:09:41,770 INFO L87 Difference]: Start difference. First operand 247 states and 248 transitions. Second operand 75 states. [2018-10-22 16:09:43,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:43,143 INFO L93 Difference]: Finished difference Result 354 states and 379 transitions. [2018-10-22 16:09:43,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-22 16:09:43,143 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 244 [2018-10-22 16:09:43,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:43,145 INFO L225 Difference]: With dead ends: 354 [2018-10-22 16:09:43,145 INFO L226 Difference]: Without dead ends: 249 [2018-10-22 16:09:43,146 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1050 GetRequests, 856 SyntacticMatches, 96 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5914 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=2299, Invalid=7601, Unknown=0, NotChecked=0, Total=9900 [2018-10-22 16:09:43,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2018-10-22 16:09:43,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 249. [2018-10-22 16:09:43,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 249 states. [2018-10-22 16:09:43,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 250 transitions. [2018-10-22 16:09:43,158 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 250 transitions. Word has length 244 [2018-10-22 16:09:43,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:43,158 INFO L481 AbstractCegarLoop]: Abstraction has 249 states and 250 transitions. [2018-10-22 16:09:43,158 INFO L482 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-10-22 16:09:43,158 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 250 transitions. [2018-10-22 16:09:43,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2018-10-22 16:09:43,159 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:43,160 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:43,160 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:43,160 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:43,160 INFO L82 PathProgramCache]: Analyzing trace with hash -565411293, now seen corresponding path program 46 times [2018-10-22 16:09:43,160 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:43,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:43,161 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:43,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:43,161 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:43,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:44,345 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 645 proven. 1148 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2018-10-22 16:09:44,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:44,346 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:44,346 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:44,346 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:44,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:44,346 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:44,354 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:44,354 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:44,427 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:44,427 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:44,431 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:44,523 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 646 proven. 1081 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-22 16:09:44,523 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:45,054 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 646 proven. 1081 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-22 16:09:45,074 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:45,074 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 93 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 93 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:45,089 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:45,089 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:45,274 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:45,274 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:45,282 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:45,323 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 646 proven. 1081 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-22 16:09:45,323 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:45,892 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 646 proven. 1081 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-22 16:09:45,893 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:45,893 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29, 29, 29] total 32 [2018-10-22 16:09:45,894 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:45,894 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-22 16:09:45,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-22 16:09:45,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=629, Unknown=0, NotChecked=0, Total=992 [2018-10-22 16:09:45,894 INFO L87 Difference]: Start difference. First operand 249 states and 250 transitions. Second operand 32 states. [2018-10-22 16:09:46,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:46,202 INFO L93 Difference]: Finished difference Result 259 states and 260 transitions. [2018-10-22 16:09:46,202 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-22 16:09:46,202 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 246 [2018-10-22 16:09:46,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:46,204 INFO L225 Difference]: With dead ends: 259 [2018-10-22 16:09:46,204 INFO L226 Difference]: Without dead ends: 257 [2018-10-22 16:09:46,205 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1039 GetRequests, 909 SyntacticMatches, 98 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1374 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=376, Invalid=746, Unknown=0, NotChecked=0, Total=1122 [2018-10-22 16:09:46,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2018-10-22 16:09:46,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 257. [2018-10-22 16:09:46,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 257 states. [2018-10-22 16:09:46,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 258 transitions. [2018-10-22 16:09:46,214 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 258 transitions. Word has length 246 [2018-10-22 16:09:46,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:46,215 INFO L481 AbstractCegarLoop]: Abstraction has 257 states and 258 transitions. [2018-10-22 16:09:46,215 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-22 16:09:46,215 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 258 transitions. [2018-10-22 16:09:46,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2018-10-22 16:09:46,216 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:46,216 INFO L375 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 25, 24, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:46,216 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:46,217 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:46,217 INFO L82 PathProgramCache]: Analyzing trace with hash -1899076537, now seen corresponding path program 47 times [2018-10-22 16:09:46,217 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:46,217 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:46,218 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:46,218 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:46,218 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:46,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:47,594 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-22 16:09:47,594 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:47,594 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:47,594 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:47,594 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:47,594 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:47,594 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:47,602 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:47,602 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:47,697 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2018-10-22 16:09:47,697 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:47,702 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:48,797 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-22 16:09:48,797 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:49,907 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-22 16:09:49,927 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:49,927 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 95 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 95 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:49,945 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:49,946 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:50,589 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2018-10-22 16:09:50,590 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:50,597 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:50,672 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-22 16:09:50,672 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:51,548 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-22 16:09:51,550 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:51,550 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53, 53, 53] total 78 [2018-10-22 16:09:51,550 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:51,551 INFO L460 AbstractCegarLoop]: Interpolant automaton has 78 states [2018-10-22 16:09:51,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2018-10-22 16:09:51,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1403, Invalid=4603, Unknown=0, NotChecked=0, Total=6006 [2018-10-22 16:09:51,552 INFO L87 Difference]: Start difference. First operand 257 states and 258 transitions. Second operand 78 states. [2018-10-22 16:09:52,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:52,998 INFO L93 Difference]: Finished difference Result 368 states and 394 transitions. [2018-10-22 16:09:52,998 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-22 16:09:52,999 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 254 [2018-10-22 16:09:52,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:53,000 INFO L225 Difference]: With dead ends: 368 [2018-10-22 16:09:53,000 INFO L226 Difference]: Without dead ends: 259 [2018-10-22 16:09:53,001 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1093 GetRequests, 891 SyntacticMatches, 100 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6423 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=2482, Invalid=8230, Unknown=0, NotChecked=0, Total=10712 [2018-10-22 16:09:53,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2018-10-22 16:09:53,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 259. [2018-10-22 16:09:53,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2018-10-22 16:09:53,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 260 transitions. [2018-10-22 16:09:53,012 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 260 transitions. Word has length 254 [2018-10-22 16:09:53,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:53,013 INFO L481 AbstractCegarLoop]: Abstraction has 259 states and 260 transitions. [2018-10-22 16:09:53,013 INFO L482 AbstractCegarLoop]: Interpolant automaton has 78 states. [2018-10-22 16:09:53,013 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 260 transitions. [2018-10-22 16:09:53,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 257 [2018-10-22 16:09:53,014 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:53,015 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:53,015 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:53,015 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:53,015 INFO L82 PathProgramCache]: Analyzing trace with hash 1410392577, now seen corresponding path program 48 times [2018-10-22 16:09:53,015 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:53,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:53,016 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:53,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:53,016 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:53,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:53,464 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 697 proven. 1246 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2018-10-22 16:09:53,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:53,464 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:53,464 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:53,464 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:53,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:53,464 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:53,471 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:53,471 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:53,572 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 26 check-sat command(s) [2018-10-22 16:09:53,573 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:53,576 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:53,671 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 698 proven. 1176 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-22 16:09:53,671 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:54,557 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 698 proven. 1176 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-22 16:09:54,578 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:54,578 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 97 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 97 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:54,592 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:54,592 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:55,265 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 26 check-sat command(s) [2018-10-22 16:09:55,265 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:55,274 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:55,338 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 698 proven. 1176 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-22 16:09:55,339 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:55,900 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 698 proven. 1176 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-22 16:09:55,902 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:55,902 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30, 30, 30] total 33 [2018-10-22 16:09:55,902 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:55,902 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-22 16:09:55,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-22 16:09:55,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=390, Invalid=666, Unknown=0, NotChecked=0, Total=1056 [2018-10-22 16:09:55,903 INFO L87 Difference]: Start difference. First operand 259 states and 260 transitions. Second operand 33 states. [2018-10-22 16:09:56,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:56,298 INFO L93 Difference]: Finished difference Result 269 states and 270 transitions. [2018-10-22 16:09:56,299 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-22 16:09:56,299 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 256 [2018-10-22 16:09:56,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:56,302 INFO L225 Difference]: With dead ends: 269 [2018-10-22 16:09:56,302 INFO L226 Difference]: Without dead ends: 267 [2018-10-22 16:09:56,302 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1081 GetRequests, 946 SyntacticMatches, 102 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1481 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=403, Invalid=787, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 16:09:56,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2018-10-22 16:09:56,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 267. [2018-10-22 16:09:56,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 267 states. [2018-10-22 16:09:56,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 268 transitions. [2018-10-22 16:09:56,314 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 268 transitions. Word has length 256 [2018-10-22 16:09:56,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:56,314 INFO L481 AbstractCegarLoop]: Abstraction has 267 states and 268 transitions. [2018-10-22 16:09:56,314 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-22 16:09:56,315 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 268 transitions. [2018-10-22 16:09:56,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2018-10-22 16:09:56,319 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:56,319 INFO L375 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 26, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:56,319 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:56,319 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:56,319 INFO L82 PathProgramCache]: Analyzing trace with hash -115603931, now seen corresponding path program 49 times [2018-10-22 16:09:56,319 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:56,320 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:56,320 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:56,320 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:56,320 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:56,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:57,329 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-22 16:09:57,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:57,329 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:57,329 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:57,330 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:57,330 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:57,330 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:57,338 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:57,338 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:57,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:57,417 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:58,602 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-22 16:09:58,602 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:59,873 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-22 16:09:59,893 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:59,893 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 99 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 99 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:59,908 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:59,908 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:00,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:00,073 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:00,137 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-22 16:10:00,138 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:01,047 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-22 16:10:01,048 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:01,049 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55, 55, 55] total 81 [2018-10-22 16:10:01,049 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:01,049 INFO L460 AbstractCegarLoop]: Interpolant automaton has 81 states [2018-10-22 16:10:01,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2018-10-22 16:10:01,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1511, Invalid=4969, Unknown=0, NotChecked=0, Total=6480 [2018-10-22 16:10:01,050 INFO L87 Difference]: Start difference. First operand 267 states and 268 transitions. Second operand 81 states. [2018-10-22 16:10:02,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:02,611 INFO L93 Difference]: Finished difference Result 382 states and 409 transitions. [2018-10-22 16:10:02,611 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-22 16:10:02,611 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 264 [2018-10-22 16:10:02,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:02,612 INFO L225 Difference]: With dead ends: 382 [2018-10-22 16:10:02,613 INFO L226 Difference]: Without dead ends: 269 [2018-10-22 16:10:02,614 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1136 GetRequests, 926 SyntacticMatches, 104 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6953 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=2672, Invalid=8884, Unknown=0, NotChecked=0, Total=11556 [2018-10-22 16:10:02,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2018-10-22 16:10:02,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 269. [2018-10-22 16:10:02,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2018-10-22 16:10:02,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 270 transitions. [2018-10-22 16:10:02,625 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 270 transitions. Word has length 264 [2018-10-22 16:10:02,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:02,625 INFO L481 AbstractCegarLoop]: Abstraction has 269 states and 270 transitions. [2018-10-22 16:10:02,626 INFO L482 AbstractCegarLoop]: Interpolant automaton has 81 states. [2018-10-22 16:10:02,626 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 270 transitions. [2018-10-22 16:10:02,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2018-10-22 16:10:02,627 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:02,627 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:02,628 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:02,628 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:02,628 INFO L82 PathProgramCache]: Analyzing trace with hash 1833968479, now seen corresponding path program 50 times [2018-10-22 16:10:02,628 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:02,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:02,629 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:02,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:02,629 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:02,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:03,111 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 751 proven. 1348 refuted. 0 times theorem prover too weak. 1128 trivial. 0 not checked. [2018-10-22 16:10:03,111 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:03,111 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:03,111 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:03,112 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:03,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:03,112 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:03,120 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:03,120 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:03,196 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:03,196 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:03,199 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:03,283 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 752 proven. 1275 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-22 16:10:03,283 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:03,896 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 752 proven. 1275 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-22 16:10:03,918 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:03,918 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 101 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 101 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:03,933 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:03,933 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:04,108 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:04,108 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:04,117 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:04,158 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 752 proven. 1275 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-22 16:10:04,159 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:05,198 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 752 proven. 1275 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-22 16:10:05,199 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:05,199 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31, 31, 31] total 34 [2018-10-22 16:10:05,200 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:05,200 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-22 16:10:05,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-22 16:10:05,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=418, Invalid=704, Unknown=0, NotChecked=0, Total=1122 [2018-10-22 16:10:05,201 INFO L87 Difference]: Start difference. First operand 269 states and 270 transitions. Second operand 34 states. [2018-10-22 16:10:05,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:05,549 INFO L93 Difference]: Finished difference Result 279 states and 280 transitions. [2018-10-22 16:10:05,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-22 16:10:05,551 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 266 [2018-10-22 16:10:05,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:05,553 INFO L225 Difference]: With dead ends: 279 [2018-10-22 16:10:05,553 INFO L226 Difference]: Without dead ends: 277 [2018-10-22 16:10:05,553 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1123 GetRequests, 983 SyntacticMatches, 106 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1592 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=431, Invalid=829, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:10:05,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2018-10-22 16:10:05,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 277. [2018-10-22 16:10:05,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 277 states. [2018-10-22 16:10:05,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 278 transitions. [2018-10-22 16:10:05,562 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 278 transitions. Word has length 266 [2018-10-22 16:10:05,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:05,563 INFO L481 AbstractCegarLoop]: Abstraction has 277 states and 278 transitions. [2018-10-22 16:10:05,563 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-22 16:10:05,563 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 278 transitions. [2018-10-22 16:10:05,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2018-10-22 16:10:05,564 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:05,565 INFO L375 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 27, 26, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:05,565 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:05,565 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:05,565 INFO L82 PathProgramCache]: Analyzing trace with hash 883624323, now seen corresponding path program 51 times [2018-10-22 16:10:05,565 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:05,566 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:05,566 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:05,566 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:05,566 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:05,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:06,646 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-22 16:10:06,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:06,647 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:06,647 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:06,647 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:06,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:06,647 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:06,655 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:06,656 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:06,765 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-22 16:10:06,765 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:06,770 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:08,017 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-22 16:10:08,018 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:09,012 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-22 16:10:09,032 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:09,033 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 103 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 103 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:09,047 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:09,047 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:09,794 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-22 16:10:09,794 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:09,803 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:09,877 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-22 16:10:09,878 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:10,886 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-22 16:10:10,888 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:10,888 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57, 57, 57] total 84 [2018-10-22 16:10:10,888 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:10,889 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2018-10-22 16:10:10,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2018-10-22 16:10:10,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1623, Invalid=5349, Unknown=0, NotChecked=0, Total=6972 [2018-10-22 16:10:10,890 INFO L87 Difference]: Start difference. First operand 277 states and 278 transitions. Second operand 84 states. [2018-10-22 16:10:12,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:12,604 INFO L93 Difference]: Finished difference Result 396 states and 424 transitions. [2018-10-22 16:10:12,604 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-10-22 16:10:12,604 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 274 [2018-10-22 16:10:12,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:12,605 INFO L225 Difference]: With dead ends: 396 [2018-10-22 16:10:12,606 INFO L226 Difference]: Without dead ends: 279 [2018-10-22 16:10:12,607 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1179 GetRequests, 961 SyntacticMatches, 108 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7504 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=2869, Invalid=9563, Unknown=0, NotChecked=0, Total=12432 [2018-10-22 16:10:12,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2018-10-22 16:10:12,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 279. [2018-10-22 16:10:12,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 279 states. [2018-10-22 16:10:12,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 280 transitions. [2018-10-22 16:10:12,616 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 280 transitions. Word has length 274 [2018-10-22 16:10:12,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:12,616 INFO L481 AbstractCegarLoop]: Abstraction has 279 states and 280 transitions. [2018-10-22 16:10:12,616 INFO L482 AbstractCegarLoop]: Interpolant automaton has 84 states. [2018-10-22 16:10:12,616 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 280 transitions. [2018-10-22 16:10:12,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2018-10-22 16:10:12,618 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:12,618 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:12,618 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:12,618 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:12,619 INFO L82 PathProgramCache]: Analyzing trace with hash -1678809539, now seen corresponding path program 52 times [2018-10-22 16:10:12,619 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:12,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:12,619 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:12,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:12,620 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:12,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:13,248 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 807 proven. 1454 refuted. 0 times theorem prover too weak. 1225 trivial. 0 not checked. [2018-10-22 16:10:13,248 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:13,249 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:13,249 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:13,249 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:13,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:13,249 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:13,255 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:13,256 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:13,335 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:13,335 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:13,339 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:13,436 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 808 proven. 1378 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-22 16:10:13,436 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:14,085 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 808 proven. 1378 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-22 16:10:14,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:14,105 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 105 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 105 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:14,120 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:14,120 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:14,338 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:14,339 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:14,348 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:14,400 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 808 proven. 1378 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-22 16:10:14,400 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:15,351 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 808 proven. 1378 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-22 16:10:15,353 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:15,353 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32, 32, 32] total 35 [2018-10-22 16:10:15,353 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:15,354 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-22 16:10:15,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-22 16:10:15,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=447, Invalid=743, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 16:10:15,355 INFO L87 Difference]: Start difference. First operand 279 states and 280 transitions. Second operand 35 states. [2018-10-22 16:10:15,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:15,743 INFO L93 Difference]: Finished difference Result 289 states and 290 transitions. [2018-10-22 16:10:15,744 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-22 16:10:15,744 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 276 [2018-10-22 16:10:15,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:15,746 INFO L225 Difference]: With dead ends: 289 [2018-10-22 16:10:15,746 INFO L226 Difference]: Without dead ends: 287 [2018-10-22 16:10:15,746 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1165 GetRequests, 1020 SyntacticMatches, 110 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1707 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=460, Invalid=872, Unknown=0, NotChecked=0, Total=1332 [2018-10-22 16:10:15,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2018-10-22 16:10:15,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 287. [2018-10-22 16:10:15,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2018-10-22 16:10:15,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 288 transitions. [2018-10-22 16:10:15,758 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 288 transitions. Word has length 276 [2018-10-22 16:10:15,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:15,758 INFO L481 AbstractCegarLoop]: Abstraction has 287 states and 288 transitions. [2018-10-22 16:10:15,758 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-22 16:10:15,759 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 288 transitions. [2018-10-22 16:10:15,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2018-10-22 16:10:15,760 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:15,760 INFO L375 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 28, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:15,761 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:15,761 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:15,761 INFO L82 PathProgramCache]: Analyzing trace with hash -1941926303, now seen corresponding path program 53 times [2018-10-22 16:10:15,761 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:15,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:15,762 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:15,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:15,762 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:15,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:16,920 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-22 16:10:16,920 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:16,920 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:16,920 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:16,920 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:16,920 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:16,920 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:16,928 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:16,928 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:17,043 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 28 check-sat command(s) [2018-10-22 16:10:17,043 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:17,049 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:18,369 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-22 16:10:18,370 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:19,440 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-22 16:10:19,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:19,462 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 107 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 107 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:19,476 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:19,477 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:20,277 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 28 check-sat command(s) [2018-10-22 16:10:20,278 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:20,286 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:20,365 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-22 16:10:20,365 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:21,397 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-22 16:10:21,398 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:21,399 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59, 59, 59] total 87 [2018-10-22 16:10:21,399 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:21,400 INFO L460 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-10-22 16:10:21,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-10-22 16:10:21,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1739, Invalid=5743, Unknown=0, NotChecked=0, Total=7482 [2018-10-22 16:10:21,401 INFO L87 Difference]: Start difference. First operand 287 states and 288 transitions. Second operand 87 states. [2018-10-22 16:10:23,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:23,201 INFO L93 Difference]: Finished difference Result 410 states and 439 transitions. [2018-10-22 16:10:23,201 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-22 16:10:23,201 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 284 [2018-10-22 16:10:23,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:23,203 INFO L225 Difference]: With dead ends: 410 [2018-10-22 16:10:23,203 INFO L226 Difference]: Without dead ends: 289 [2018-10-22 16:10:23,204 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1222 GetRequests, 996 SyntacticMatches, 112 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8076 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=3073, Invalid=10267, Unknown=0, NotChecked=0, Total=13340 [2018-10-22 16:10:23,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2018-10-22 16:10:23,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2018-10-22 16:10:23,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 289 states. [2018-10-22 16:10:23,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 290 transitions. [2018-10-22 16:10:23,217 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 290 transitions. Word has length 284 [2018-10-22 16:10:23,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:23,217 INFO L481 AbstractCegarLoop]: Abstraction has 289 states and 290 transitions. [2018-10-22 16:10:23,217 INFO L482 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-10-22 16:10:23,217 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 290 transitions. [2018-10-22 16:10:23,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2018-10-22 16:10:23,219 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:23,219 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 28, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:23,219 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:23,219 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:23,220 INFO L82 PathProgramCache]: Analyzing trace with hash 216779419, now seen corresponding path program 54 times [2018-10-22 16:10:23,220 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:23,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:23,220 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:23,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:23,221 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:23,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:23,735 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 865 proven. 1564 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2018-10-22 16:10:23,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:23,736 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:23,736 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:23,736 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:23,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:23,736 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:23,744 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:23,745 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:23,860 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 29 check-sat command(s) [2018-10-22 16:10:23,860 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:23,865 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:23,965 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 866 proven. 1485 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-22 16:10:23,966 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:24,666 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 866 proven. 1485 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-22 16:10:24,688 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:24,689 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 109 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 109 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:24,704 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:24,704 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:25,559 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 29 check-sat command(s) [2018-10-22 16:10:25,559 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:25,573 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:25,643 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 866 proven. 1485 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-22 16:10:25,643 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:26,378 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 866 proven. 1485 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-22 16:10:26,380 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:26,380 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33, 33, 33] total 36 [2018-10-22 16:10:26,380 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:26,380 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-22 16:10:26,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-22 16:10:26,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=783, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:10:26,381 INFO L87 Difference]: Start difference. First operand 289 states and 290 transitions. Second operand 36 states. [2018-10-22 16:10:26,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:26,816 INFO L93 Difference]: Finished difference Result 299 states and 300 transitions. [2018-10-22 16:10:26,816 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-22 16:10:26,817 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 286 [2018-10-22 16:10:26,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:26,819 INFO L225 Difference]: With dead ends: 299 [2018-10-22 16:10:26,819 INFO L226 Difference]: Without dead ends: 297 [2018-10-22 16:10:26,819 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1207 GetRequests, 1057 SyntacticMatches, 114 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1826 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=490, Invalid=916, Unknown=0, NotChecked=0, Total=1406 [2018-10-22 16:10:26,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2018-10-22 16:10:26,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 297. [2018-10-22 16:10:26,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 297 states. [2018-10-22 16:10:26,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 298 transitions. [2018-10-22 16:10:26,829 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 298 transitions. Word has length 286 [2018-10-22 16:10:26,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:26,830 INFO L481 AbstractCegarLoop]: Abstraction has 297 states and 298 transitions. [2018-10-22 16:10:26,830 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-22 16:10:26,830 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 298 transitions. [2018-10-22 16:10:26,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2018-10-22 16:10:26,832 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:26,832 INFO L375 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 29, 28, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:26,832 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:26,832 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:26,832 INFO L82 PathProgramCache]: Analyzing trace with hash 1840886975, now seen corresponding path program 55 times [2018-10-22 16:10:26,832 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:26,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:26,833 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:26,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:26,833 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:26,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:28,020 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-22 16:10:28,020 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:28,020 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:28,021 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:28,021 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:28,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:28,021 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:28,029 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:28,029 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:28,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:28,112 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:29,590 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-22 16:10:29,591 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:31,026 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-22 16:10:31,046 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:31,046 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 111 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 111 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:31,061 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:31,061 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:31,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:31,252 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:31,334 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-22 16:10:31,334 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:32,487 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-22 16:10:32,488 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:32,489 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61, 61, 61] total 90 [2018-10-22 16:10:32,489 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:32,489 INFO L460 AbstractCegarLoop]: Interpolant automaton has 90 states [2018-10-22 16:10:32,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2018-10-22 16:10:32,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1859, Invalid=6151, Unknown=0, NotChecked=0, Total=8010 [2018-10-22 16:10:32,490 INFO L87 Difference]: Start difference. First operand 297 states and 298 transitions. Second operand 90 states. [2018-10-22 16:10:34,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:34,305 INFO L93 Difference]: Finished difference Result 424 states and 454 transitions. [2018-10-22 16:10:34,306 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-22 16:10:34,306 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 294 [2018-10-22 16:10:34,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:34,307 INFO L225 Difference]: With dead ends: 424 [2018-10-22 16:10:34,307 INFO L226 Difference]: Without dead ends: 299 [2018-10-22 16:10:34,308 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1265 GetRequests, 1031 SyntacticMatches, 116 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8669 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=3284, Invalid=10996, Unknown=0, NotChecked=0, Total=14280 [2018-10-22 16:10:34,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2018-10-22 16:10:34,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 299. [2018-10-22 16:10:34,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 299 states. [2018-10-22 16:10:34,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 300 transitions. [2018-10-22 16:10:34,318 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 300 transitions. Word has length 294 [2018-10-22 16:10:34,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:34,318 INFO L481 AbstractCegarLoop]: Abstraction has 299 states and 300 transitions. [2018-10-22 16:10:34,318 INFO L482 AbstractCegarLoop]: Interpolant automaton has 90 states. [2018-10-22 16:10:34,318 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 300 transitions. [2018-10-22 16:10:34,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2018-10-22 16:10:34,320 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:34,320 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:34,320 INFO L424 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:34,320 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:34,321 INFO L82 PathProgramCache]: Analyzing trace with hash -1436913543, now seen corresponding path program 56 times [2018-10-22 16:10:34,321 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:34,321 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:34,321 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:34,321 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:34,322 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:34,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:35,219 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 925 proven. 1678 refuted. 0 times theorem prover too weak. 1431 trivial. 0 not checked. [2018-10-22 16:10:35,220 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:35,220 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:35,220 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:35,220 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:35,220 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:35,220 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:35,227 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:35,227 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:35,309 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:35,309 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:35,313 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:35,466 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 926 proven. 1596 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-22 16:10:35,467 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:36,210 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 926 proven. 1596 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-22 16:10:36,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:36,230 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 113 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 113 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:36,245 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:36,245 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:36,441 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:36,442 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:36,452 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:36,511 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 926 proven. 1596 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-22 16:10:36,511 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:37,310 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 926 proven. 1596 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-22 16:10:37,311 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:37,312 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34, 34, 34] total 37 [2018-10-22 16:10:37,312 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:37,312 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-22 16:10:37,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-22 16:10:37,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=508, Invalid=824, Unknown=0, NotChecked=0, Total=1332 [2018-10-22 16:10:37,313 INFO L87 Difference]: Start difference. First operand 299 states and 300 transitions. Second operand 37 states. [2018-10-22 16:10:37,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:37,749 INFO L93 Difference]: Finished difference Result 309 states and 310 transitions. [2018-10-22 16:10:37,749 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-22 16:10:37,749 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 296 [2018-10-22 16:10:37,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:37,751 INFO L225 Difference]: With dead ends: 309 [2018-10-22 16:10:37,751 INFO L226 Difference]: Without dead ends: 307 [2018-10-22 16:10:37,752 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1249 GetRequests, 1094 SyntacticMatches, 118 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1949 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=521, Invalid=961, Unknown=0, NotChecked=0, Total=1482 [2018-10-22 16:10:37,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2018-10-22 16:10:37,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 307. [2018-10-22 16:10:37,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 307 states. [2018-10-22 16:10:37,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 308 transitions. [2018-10-22 16:10:37,763 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 308 transitions. Word has length 296 [2018-10-22 16:10:37,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:37,764 INFO L481 AbstractCegarLoop]: Abstraction has 307 states and 308 transitions. [2018-10-22 16:10:37,764 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-22 16:10:37,764 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 308 transitions. [2018-10-22 16:10:37,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2018-10-22 16:10:37,766 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:37,766 INFO L375 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 30, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:37,766 INFO L424 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:37,766 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:37,767 INFO L82 PathProgramCache]: Analyzing trace with hash 1812700317, now seen corresponding path program 57 times [2018-10-22 16:10:37,767 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:37,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:37,767 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:37,768 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:37,768 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:37,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:39,063 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-22 16:10:39,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:39,063 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:39,064 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:39,064 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:39,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:39,064 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:39,071 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:39,071 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:39,191 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-22 16:10:39,191 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:39,195 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:40,954 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-22 16:10:40,955 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:42,120 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-22 16:10:42,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:42,142 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 115 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 115 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:42,156 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:42,157 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:43,114 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-22 16:10:43,114 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:43,123 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:43,227 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-22 16:10:43,227 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:44,436 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-22 16:10:44,438 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:44,438 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63, 63, 63] total 93 [2018-10-22 16:10:44,438 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:44,439 INFO L460 AbstractCegarLoop]: Interpolant automaton has 93 states [2018-10-22 16:10:44,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2018-10-22 16:10:44,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1983, Invalid=6573, Unknown=0, NotChecked=0, Total=8556 [2018-10-22 16:10:44,439 INFO L87 Difference]: Start difference. First operand 307 states and 308 transitions. Second operand 93 states. [2018-10-22 16:10:46,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:46,541 INFO L93 Difference]: Finished difference Result 438 states and 469 transitions. [2018-10-22 16:10:46,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-22 16:10:46,541 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 304 [2018-10-22 16:10:46,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:46,542 INFO L225 Difference]: With dead ends: 438 [2018-10-22 16:10:46,543 INFO L226 Difference]: Without dead ends: 309 [2018-10-22 16:10:46,544 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1308 GetRequests, 1066 SyntacticMatches, 120 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9283 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=3502, Invalid=11750, Unknown=0, NotChecked=0, Total=15252 [2018-10-22 16:10:46,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2018-10-22 16:10:46,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 309. [2018-10-22 16:10:46,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 309 states. [2018-10-22 16:10:46,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 310 transitions. [2018-10-22 16:10:46,555 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 310 transitions. Word has length 304 [2018-10-22 16:10:46,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:46,555 INFO L481 AbstractCegarLoop]: Abstraction has 309 states and 310 transitions. [2018-10-22 16:10:46,555 INFO L482 AbstractCegarLoop]: Interpolant automaton has 93 states. [2018-10-22 16:10:46,555 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 310 transitions. [2018-10-22 16:10:46,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2018-10-22 16:10:46,557 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:46,557 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 30, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:46,557 INFO L424 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:46,557 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:46,558 INFO L82 PathProgramCache]: Analyzing trace with hash -1654097961, now seen corresponding path program 58 times [2018-10-22 16:10:46,558 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:46,558 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:46,558 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:46,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:46,559 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:46,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:47,249 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 987 proven. 1796 refuted. 0 times theorem prover too weak. 1540 trivial. 0 not checked. [2018-10-22 16:10:47,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:47,249 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:47,249 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:47,249 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:47,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:47,249 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:47,256 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:47,256 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:47,347 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:47,347 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:47,352 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:47,467 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 988 proven. 1711 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-22 16:10:47,468 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:48,279 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 988 proven. 1711 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-22 16:10:48,299 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:48,299 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 117 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 117 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:48,314 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:48,314 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:48,550 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:48,550 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:48,565 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:48,633 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 988 proven. 1711 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-22 16:10:48,634 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:49,419 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 988 proven. 1711 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-22 16:10:49,420 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:49,421 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35, 35, 35] total 38 [2018-10-22 16:10:49,421 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:49,421 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-22 16:10:49,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-22 16:10:49,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=866, Unknown=0, NotChecked=0, Total=1406 [2018-10-22 16:10:49,422 INFO L87 Difference]: Start difference. First operand 309 states and 310 transitions. Second operand 38 states. [2018-10-22 16:10:49,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:49,883 INFO L93 Difference]: Finished difference Result 319 states and 320 transitions. [2018-10-22 16:10:49,883 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-22 16:10:49,884 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 306 [2018-10-22 16:10:49,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:49,886 INFO L225 Difference]: With dead ends: 319 [2018-10-22 16:10:49,886 INFO L226 Difference]: Without dead ends: 317 [2018-10-22 16:10:49,886 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1291 GetRequests, 1131 SyntacticMatches, 122 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2076 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=553, Invalid=1007, Unknown=0, NotChecked=0, Total=1560 [2018-10-22 16:10:49,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2018-10-22 16:10:49,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 317. [2018-10-22 16:10:49,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 317 states. [2018-10-22 16:10:49,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 318 transitions. [2018-10-22 16:10:49,895 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 318 transitions. Word has length 306 [2018-10-22 16:10:49,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:49,896 INFO L481 AbstractCegarLoop]: Abstraction has 317 states and 318 transitions. [2018-10-22 16:10:49,896 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-22 16:10:49,896 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 318 transitions. [2018-10-22 16:10:49,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2018-10-22 16:10:49,897 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:49,898 INFO L375 BasicCegarLoop]: trace histogram [31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:49,898 INFO L424 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:49,898 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:49,898 INFO L82 PathProgramCache]: Analyzing trace with hash -1052547589, now seen corresponding path program 59 times [2018-10-22 16:10:49,898 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:49,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:49,899 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:49,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:49,899 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:49,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:51,902 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-22 16:10:51,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:51,902 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:51,902 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:51,903 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:51,903 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:51,903 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:51,910 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:51,911 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:52,039 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 31 check-sat command(s) [2018-10-22 16:10:52,039 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:52,045 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:53,861 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-22 16:10:53,861 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:55,199 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-22 16:10:55,220 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:55,220 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 119 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 119 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:55,234 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:55,234 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:56,194 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 31 check-sat command(s) [2018-10-22 16:10:56,195 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:56,204 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:56,302 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-22 16:10:56,302 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:57,571 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-22 16:10:57,573 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:57,573 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65, 65, 65] total 96 [2018-10-22 16:10:57,574 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:57,574 INFO L460 AbstractCegarLoop]: Interpolant automaton has 96 states [2018-10-22 16:10:57,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2018-10-22 16:10:57,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2111, Invalid=7009, Unknown=0, NotChecked=0, Total=9120 [2018-10-22 16:10:57,576 INFO L87 Difference]: Start difference. First operand 317 states and 318 transitions. Second operand 96 states. [2018-10-22 16:10:59,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:59,687 INFO L93 Difference]: Finished difference Result 452 states and 484 transitions. [2018-10-22 16:10:59,688 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-22 16:10:59,688 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 314 [2018-10-22 16:10:59,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:59,689 INFO L225 Difference]: With dead ends: 452 [2018-10-22 16:10:59,689 INFO L226 Difference]: Without dead ends: 319 [2018-10-22 16:10:59,691 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1351 GetRequests, 1101 SyntacticMatches, 124 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9918 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=3727, Invalid=12529, Unknown=0, NotChecked=0, Total=16256 [2018-10-22 16:10:59,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2018-10-22 16:10:59,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 319. [2018-10-22 16:10:59,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 319 states. [2018-10-22 16:10:59,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 320 transitions. [2018-10-22 16:10:59,700 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 320 transitions. Word has length 314 [2018-10-22 16:10:59,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:59,700 INFO L481 AbstractCegarLoop]: Abstraction has 319 states and 320 transitions. [2018-10-22 16:10:59,700 INFO L482 AbstractCegarLoop]: Interpolant automaton has 96 states. [2018-10-22 16:10:59,701 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 320 transitions. [2018-10-22 16:10:59,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2018-10-22 16:10:59,702 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:59,702 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 31, 31, 31, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:59,702 INFO L424 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:59,702 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:59,702 INFO L82 PathProgramCache]: Analyzing trace with hash 1348141237, now seen corresponding path program 60 times [2018-10-22 16:10:59,703 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:59,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:59,703 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:59,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:59,703 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:59,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:00,293 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1051 proven. 1918 refuted. 0 times theorem prover too weak. 1653 trivial. 0 not checked. [2018-10-22 16:11:00,293 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:00,293 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:00,294 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:00,294 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:00,294 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:00,294 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 120 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 120 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:00,301 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:11:00,302 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:11:00,538 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 32 check-sat command(s) [2018-10-22 16:11:00,538 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:00,543 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:00,726 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1052 proven. 1830 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-22 16:11:00,727 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:01,698 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1052 proven. 1830 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-22 16:11:01,719 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:01,719 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 121 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 121 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:01,733 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:11:01,733 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:11:02,711 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 32 check-sat command(s) [2018-10-22 16:11:02,712 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:02,724 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:02,797 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1052 proven. 1830 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-22 16:11:02,798 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:03,629 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1052 proven. 1830 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-22 16:11:03,630 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:03,631 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36, 36, 36, 36] total 39 [2018-10-22 16:11:03,631 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:03,631 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-22 16:11:03,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-22 16:11:03,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=909, Unknown=0, NotChecked=0, Total=1482 [2018-10-22 16:11:03,632 INFO L87 Difference]: Start difference. First operand 319 states and 320 transitions. Second operand 39 states. [2018-10-22 16:11:04,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:04,078 INFO L93 Difference]: Finished difference Result 329 states and 330 transitions. [2018-10-22 16:11:04,078 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-22 16:11:04,078 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 316 [2018-10-22 16:11:04,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:04,081 INFO L225 Difference]: With dead ends: 329 [2018-10-22 16:11:04,081 INFO L226 Difference]: Without dead ends: 327 [2018-10-22 16:11:04,081 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1333 GetRequests, 1168 SyntacticMatches, 126 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2207 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=586, Invalid=1054, Unknown=0, NotChecked=0, Total=1640 [2018-10-22 16:11:04,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2018-10-22 16:11:04,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 327. [2018-10-22 16:11:04,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 327 states. [2018-10-22 16:11:04,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 328 transitions. [2018-10-22 16:11:04,091 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 328 transitions. Word has length 316 [2018-10-22 16:11:04,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:04,091 INFO L481 AbstractCegarLoop]: Abstraction has 327 states and 328 transitions. [2018-10-22 16:11:04,091 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-22 16:11:04,091 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 328 transitions. [2018-10-22 16:11:04,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2018-10-22 16:11:04,093 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:04,093 INFO L375 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 32, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:04,093 INFO L424 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:04,094 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:04,094 INFO L82 PathProgramCache]: Analyzing trace with hash 1350971609, now seen corresponding path program 61 times [2018-10-22 16:11:04,094 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:04,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:04,094 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:04,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:04,095 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:04,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:05,532 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-22 16:11:05,532 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:05,532 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:05,532 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:05,533 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:05,533 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:05,533 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 122 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 122 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:05,541 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:05,541 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:11:05,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:05,636 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:07,587 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-22 16:11:07,588 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:08,915 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-22 16:11:08,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:08,935 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 123 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 123 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:08,950 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:08,951 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:11:09,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:09,160 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:09,278 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-22 16:11:09,279 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:10,624 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-22 16:11:10,626 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:10,626 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67, 67, 67] total 99 [2018-10-22 16:11:10,626 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:10,627 INFO L460 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-10-22 16:11:10,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-10-22 16:11:10,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2243, Invalid=7459, Unknown=0, NotChecked=0, Total=9702 [2018-10-22 16:11:10,629 INFO L87 Difference]: Start difference. First operand 327 states and 328 transitions. Second operand 99 states. [2018-10-22 16:11:12,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:12,801 INFO L93 Difference]: Finished difference Result 466 states and 499 transitions. [2018-10-22 16:11:12,801 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-22 16:11:12,801 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 324 [2018-10-22 16:11:12,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:12,803 INFO L225 Difference]: With dead ends: 466 [2018-10-22 16:11:12,803 INFO L226 Difference]: Without dead ends: 329 [2018-10-22 16:11:12,804 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1394 GetRequests, 1136 SyntacticMatches, 128 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10574 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=3959, Invalid=13333, Unknown=0, NotChecked=0, Total=17292 [2018-10-22 16:11:12,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2018-10-22 16:11:12,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 329. [2018-10-22 16:11:12,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 329 states. [2018-10-22 16:11:12,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 330 transitions. [2018-10-22 16:11:12,818 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 330 transitions. Word has length 324 [2018-10-22 16:11:12,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:12,819 INFO L481 AbstractCegarLoop]: Abstraction has 329 states and 330 transitions. [2018-10-22 16:11:12,819 INFO L482 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-10-22 16:11:12,819 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 330 transitions. [2018-10-22 16:11:12,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2018-10-22 16:11:12,820 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:12,821 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:12,821 INFO L424 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:12,821 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:12,821 INFO L82 PathProgramCache]: Analyzing trace with hash -259052781, now seen corresponding path program 62 times [2018-10-22 16:11:12,821 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:12,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:12,822 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:12,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:12,822 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:12,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:13,610 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1117 proven. 2044 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2018-10-22 16:11:13,611 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:13,611 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:13,611 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:13,611 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:13,611 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:13,611 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 124 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 124 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:13,619 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:11:13,619 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:13,713 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:11:13,713 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:13,717 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:13,843 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1118 proven. 1953 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-22 16:11:13,844 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:14,786 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1118 proven. 1953 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-22 16:11:14,806 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:14,806 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 125 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 125 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:14,821 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:11:14,821 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:15,036 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:11:15,036 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:15,046 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:15,112 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1118 proven. 1953 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-22 16:11:15,112 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:16,096 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1118 proven. 1953 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-22 16:11:16,098 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:16,098 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37, 37, 37] total 40 [2018-10-22 16:11:16,099 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:16,099 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-22 16:11:16,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-22 16:11:16,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=607, Invalid=953, Unknown=0, NotChecked=0, Total=1560 [2018-10-22 16:11:16,100 INFO L87 Difference]: Start difference. First operand 329 states and 330 transitions. Second operand 40 states. [2018-10-22 16:11:16,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:16,604 INFO L93 Difference]: Finished difference Result 339 states and 340 transitions. [2018-10-22 16:11:16,604 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-22 16:11:16,604 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 326 [2018-10-22 16:11:16,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:16,607 INFO L225 Difference]: With dead ends: 339 [2018-10-22 16:11:16,607 INFO L226 Difference]: Without dead ends: 337 [2018-10-22 16:11:16,607 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1375 GetRequests, 1205 SyntacticMatches, 130 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2342 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=620, Invalid=1102, Unknown=0, NotChecked=0, Total=1722 [2018-10-22 16:11:16,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2018-10-22 16:11:16,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 337. [2018-10-22 16:11:16,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 337 states. [2018-10-22 16:11:16,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 338 transitions. [2018-10-22 16:11:16,622 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 338 transitions. Word has length 326 [2018-10-22 16:11:16,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:16,623 INFO L481 AbstractCegarLoop]: Abstraction has 337 states and 338 transitions. [2018-10-22 16:11:16,623 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-22 16:11:16,623 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 338 transitions. [2018-10-22 16:11:16,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2018-10-22 16:11:16,625 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:16,625 INFO L375 BasicCegarLoop]: trace histogram [33, 33, 33, 33, 33, 32, 32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:16,626 INFO L424 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:16,626 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:16,626 INFO L82 PathProgramCache]: Analyzing trace with hash 672210231, now seen corresponding path program 63 times [2018-10-22 16:11:16,626 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:16,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:16,627 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:16,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:16,627 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:16,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:18,221 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-22 16:11:18,221 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:18,221 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:18,222 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:18,222 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:18,222 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:18,222 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 126 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 126 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:18,229 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:11:18,229 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:11:18,365 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-10-22 16:11:18,365 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:18,369 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:20,103 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-22 16:11:20,103 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:21,648 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-22 16:11:21,669 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:21,669 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 127 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 127 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:21,685 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:11:21,685 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:11:22,769 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-10-22 16:11:22,770 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:22,786 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:22,892 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-22 16:11:22,892 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:24,338 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-22 16:11:24,340 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:24,340 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69, 69, 69] total 102 [2018-10-22 16:11:24,340 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:24,341 INFO L460 AbstractCegarLoop]: Interpolant automaton has 102 states [2018-10-22 16:11:24,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2018-10-22 16:11:24,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2379, Invalid=7923, Unknown=0, NotChecked=0, Total=10302 [2018-10-22 16:11:24,342 INFO L87 Difference]: Start difference. First operand 337 states and 338 transitions. Second operand 102 states. [2018-10-22 16:11:26,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:26,974 INFO L93 Difference]: Finished difference Result 480 states and 514 transitions. [2018-10-22 16:11:26,975 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-22 16:11:26,975 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 334 [2018-10-22 16:11:26,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:26,976 INFO L225 Difference]: With dead ends: 480 [2018-10-22 16:11:26,976 INFO L226 Difference]: Without dead ends: 339 [2018-10-22 16:11:26,977 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1437 GetRequests, 1171 SyntacticMatches, 132 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11251 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=4198, Invalid=14162, Unknown=0, NotChecked=0, Total=18360 [2018-10-22 16:11:26,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2018-10-22 16:11:26,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 339. [2018-10-22 16:11:26,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 339 states. [2018-10-22 16:11:26,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 339 states to 339 states and 340 transitions. [2018-10-22 16:11:26,988 INFO L78 Accepts]: Start accepts. Automaton has 339 states and 340 transitions. Word has length 334 [2018-10-22 16:11:26,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:26,988 INFO L481 AbstractCegarLoop]: Abstraction has 339 states and 340 transitions. [2018-10-22 16:11:26,988 INFO L482 AbstractCegarLoop]: Interpolant automaton has 102 states. [2018-10-22 16:11:26,988 INFO L276 IsEmpty]: Start isEmpty. Operand 339 states and 340 transitions. [2018-10-22 16:11:26,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2018-10-22 16:11:26,990 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:26,990 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 33, 33, 33, 32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:26,990 INFO L424 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:26,990 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:26,990 INFO L82 PathProgramCache]: Analyzing trace with hash 1887049457, now seen corresponding path program 64 times [2018-10-22 16:11:26,990 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:26,991 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:26,991 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:26,991 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:26,991 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:27,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:27,647 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1185 proven. 2174 refuted. 0 times theorem prover too weak. 1891 trivial. 0 not checked. [2018-10-22 16:11:27,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:27,647 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:27,647 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:27,648 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:27,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:27,648 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 128 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 128 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:27,663 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:11:27,663 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:11:27,761 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:11:27,761 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:27,766 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:27,902 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1186 proven. 2080 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-22 16:11:27,903 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:28,880 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1186 proven. 2080 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-22 16:11:28,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:28,900 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 129 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 129 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:28,917 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:11:28,917 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:11:29,183 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:11:29,183 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:29,194 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:29,263 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1186 proven. 2080 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-22 16:11:29,263 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:30,257 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1186 proven. 2080 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-22 16:11:30,259 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:30,259 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38, 38, 38] total 41 [2018-10-22 16:11:30,259 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:30,260 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-22 16:11:30,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-22 16:11:30,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=642, Invalid=998, Unknown=0, NotChecked=0, Total=1640 [2018-10-22 16:11:30,260 INFO L87 Difference]: Start difference. First operand 339 states and 340 transitions. Second operand 41 states. [2018-10-22 16:11:30,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:30,749 INFO L93 Difference]: Finished difference Result 349 states and 350 transitions. [2018-10-22 16:11:30,749 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-22 16:11:30,749 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 336 [2018-10-22 16:11:30,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:30,751 INFO L225 Difference]: With dead ends: 349 [2018-10-22 16:11:30,752 INFO L226 Difference]: Without dead ends: 347 [2018-10-22 16:11:30,752 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1417 GetRequests, 1242 SyntacticMatches, 134 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2481 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=655, Invalid=1151, Unknown=0, NotChecked=0, Total=1806 [2018-10-22 16:11:30,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2018-10-22 16:11:30,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 347. [2018-10-22 16:11:30,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 347 states. [2018-10-22 16:11:30,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 347 states to 347 states and 348 transitions. [2018-10-22 16:11:30,762 INFO L78 Accepts]: Start accepts. Automaton has 347 states and 348 transitions. Word has length 336 [2018-10-22 16:11:30,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:30,762 INFO L481 AbstractCegarLoop]: Abstraction has 347 states and 348 transitions. [2018-10-22 16:11:30,762 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-22 16:11:30,763 INFO L276 IsEmpty]: Start isEmpty. Operand 347 states and 348 transitions. [2018-10-22 16:11:30,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2018-10-22 16:11:30,764 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:30,764 INFO L375 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 34, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:30,764 INFO L424 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:30,764 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:30,765 INFO L82 PathProgramCache]: Analyzing trace with hash -2093397227, now seen corresponding path program 65 times [2018-10-22 16:11:30,765 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:30,765 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:30,765 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:30,765 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:30,766 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:30,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:32,539 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-22 16:11:32,540 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:32,540 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:32,540 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:32,540 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:32,540 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:32,540 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 130 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 130 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:32,548 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:11:32,548 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:32,687 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 34 check-sat command(s) [2018-10-22 16:11:32,687 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:32,693 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:34,604 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-22 16:11:34,605 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:36,118 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-22 16:11:36,139 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:36,139 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 131 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 131 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:36,153 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:11:36,153 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:37,300 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 34 check-sat command(s) [2018-10-22 16:11:37,301 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:37,311 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:37,423 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-22 16:11:37,423 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-10-22 16:11:37,482 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-22 16:11:37,683 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 131 cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:37,683 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-22 16:11:37,688 WARN L205 ceAbstractionStarter]: Timeout [2018-10-22 16:11:37,689 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 04:11:37 BoogieIcfgContainer [2018-10-22 16:11:37,689 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-22 16:11:37,689 INFO L168 Benchmark]: Toolchain (without parser) took 231554.73 ms. Allocated memory was 1.5 GB in the beginning and 2.4 GB in the end (delta: 864.0 MB). Free memory was 1.4 GB in the beginning and 1.8 GB in the end (delta: -420.8 MB). Peak memory consumption was 443.2 MB. Max. memory is 7.1 GB. [2018-10-22 16:11:37,690 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:11:37,690 INFO L168 Benchmark]: CACSL2BoogieTranslator took 289.51 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. [2018-10-22 16:11:37,690 INFO L168 Benchmark]: Boogie Procedure Inliner took 22.15 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. [2018-10-22 16:11:37,690 INFO L168 Benchmark]: Boogie Preprocessor took 22.80 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. [2018-10-22 16:11:37,691 INFO L168 Benchmark]: RCFGBuilder took 416.39 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 727.2 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -777.3 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. [2018-10-22 16:11:37,691 INFO L168 Benchmark]: TraceAbstraction took 230797.53 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 136.8 MB). Free memory was 2.2 GB in the beginning and 1.8 GB in the end (delta: 346.0 MB). Peak memory consumption was 482.8 MB. Max. memory is 7.1 GB. [2018-10-22 16:11:37,693 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 289.51 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 22.15 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 22.80 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 416.39 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 727.2 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -777.3 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 230797.53 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 136.8 MB). Free memory was 2.2 GB in the beginning and 1.8 GB in the end (delta: 346.0 MB). Peak memory consumption was 482.8 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 345 with TraceHistMax 34,while TraceCheckSpWp was constructing backward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 105 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 22 locations, 1 error locations. TIMEOUT Result, 230.7s OverallTime, 68 OverallIterations, 34 TraceHistogramMax, 47.5s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 3065 SDtfs, 2461 SDslu, 31352 SDs, 0 SdLazy, 37244 SolverSat, 2759 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 24.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 49184 GetRequests, 41510 SyntacticMatches, 4544 SemanticMatches, 3130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158691 ImplicationChecksByTransitivity, 145.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=347occurred in iteration=67, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.6s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.6s AutomataMinimizationTime, 67 MinimizatonAttempts, 5 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 1.4s SsaConstructionTime, 20.9s SatisfiabilityAnalysisTime, 147.3s InterpolantComputationTime, 34603 NumberOfCodeBlocks, 34603 NumberOfCodeBlocksAsserted, 1293 NumberOfCheckSat, 57320 ConstructedInterpolants, 0 QuantifiedInterpolants, 35420808 SizeOfPredicates, 384 NumberOfNonLiveVariables, 48960 ConjunctsInSsa, 4992 ConjunctsInUnsatCore, 323 InterpolantComputations, 3 PerfectInterpolantSequences, 409762/588162 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown