java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_false-unreach-call3_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:28:23,495 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:28:23,497 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:28:23,509 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:28:23,510 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:28:23,511 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:28:23,512 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:28:23,514 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:28:23,516 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:28:23,517 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:28:23,518 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:28:23,519 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:28:23,520 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:28:23,521 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:28:23,522 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:28:23,523 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:28:23,524 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:28:23,526 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:28:23,528 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:28:23,530 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:28:23,531 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:28:23,533 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:28:23,535 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:28:23,536 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:28:23,536 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:28:23,537 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:28:23,538 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:28:23,539 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:28:23,540 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:28:23,541 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:28:23,541 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:28:23,542 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-24 12:28:23,544 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-24 12:28:23,560 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:28:23,561 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:28:23,561 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:28:23,562 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:28:23,562 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:28:23,562 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:28:23,562 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-24 12:28:23,563 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:28:23,563 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-24 12:28:23,563 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:28:23,563 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:28:23,563 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:28:23,564 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:28:23,564 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:28:23,564 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:28:23,565 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:28:23,565 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:28:23,565 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:28:23,565 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:28:23,565 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:28:23,566 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:28:23,566 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:28:23,566 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:28:23,566 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:28:23,566 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:28:23,567 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:28:23,567 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:28:23,567 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:28:23,567 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:28:23,567 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:28:23,568 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:28:23,568 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:28:23,568 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:28:23,568 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:28:23,568 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:28:23,569 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:28:23,624 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:28:23,642 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:28:23,647 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:28:23,648 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:28:23,649 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:28:23,651 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/array_false-unreach-call3_true-termination.i [2018-10-24 12:28:23,729 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/e19c4408a/5583df15310b46c0878ea0343ba5e0e7/FLAGdc8a9cfd2 [2018-10-24 12:28:24,211 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:28:24,212 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_false-unreach-call3_true-termination.i [2018-10-24 12:28:24,218 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/e19c4408a/5583df15310b46c0878ea0343ba5e0e7/FLAGdc8a9cfd2 [2018-10-24 12:28:24,233 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/e19c4408a/5583df15310b46c0878ea0343ba5e0e7 [2018-10-24 12:28:24,245 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:28:24,247 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:28:24,248 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:28:24,248 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:28:24,252 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:28:24,253 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,256 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@25c7d86a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24, skipping insertion in model container [2018-10-24 12:28:24,256 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,267 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:28:24,287 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:28:24,473 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:28:24,477 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:28:24,502 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:28:24,532 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:28:24,533 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24 WrapperNode [2018-10-24 12:28:24,533 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:28:24,535 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:28:24,535 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:28:24,535 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:28:24,547 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,560 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,588 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:28:24,588 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:28:24,589 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:28:24,589 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:28:24,605 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,605 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,607 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,607 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,613 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,619 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,621 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,628 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:28:24,630 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:28:24,630 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:28:24,630 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:28:24,631 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:28:24,774 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:28:24,775 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:28:24,776 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:28:24,776 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:28:24,776 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:28:24,776 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:28:24,777 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:28:24,777 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:28:25,277 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:28:25,278 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:28:25 BoogieIcfgContainer [2018-10-24 12:28:25,278 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:28:25,279 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:28:25,279 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:28:25,284 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:28:25,285 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:28:24" (1/3) ... [2018-10-24 12:28:25,286 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6823cb80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:28:25, skipping insertion in model container [2018-10-24 12:28:25,286 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (2/3) ... [2018-10-24 12:28:25,286 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6823cb80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:28:25, skipping insertion in model container [2018-10-24 12:28:25,286 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:28:25" (3/3) ... [2018-10-24 12:28:25,288 INFO L112 eAbstractionObserver]: Analyzing ICFG array_false-unreach-call3_true-termination.i [2018-10-24 12:28:25,299 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:28:25,307 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:28:25,325 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:28:25,362 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:28:25,362 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:28:25,362 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:28:25,363 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:28:25,363 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:28:25,363 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:28:25,363 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:28:25,363 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:28:25,381 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2018-10-24 12:28:25,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 12:28:25,388 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:25,389 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:25,392 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:25,398 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:25,400 INFO L82 PathProgramCache]: Analyzing trace with hash 1097964223, now seen corresponding path program 1 times [2018-10-24 12:28:25,403 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:25,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:25,469 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:25,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:25,470 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:25,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:25,553 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:25,556 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:28:25,556 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:28:25,557 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:28:25,562 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:28:25,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:28:25,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:28:25,582 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2018-10-24 12:28:25,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:25,607 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2018-10-24 12:28:25,607 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:28:25,609 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-10-24 12:28:25,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:25,618 INFO L225 Difference]: With dead ends: 41 [2018-10-24 12:28:25,619 INFO L226 Difference]: Without dead ends: 18 [2018-10-24 12:28:25,627 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:28:25,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-24 12:28:25,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-24 12:28:25,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 12:28:25,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-10-24 12:28:25,673 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-10-24 12:28:25,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:25,673 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-10-24 12:28:25,673 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:28:25,674 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-10-24 12:28:25,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-24 12:28:25,675 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:25,675 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:25,676 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:25,676 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:25,676 INFO L82 PathProgramCache]: Analyzing trace with hash 1413574900, now seen corresponding path program 1 times [2018-10-24 12:28:25,679 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:25,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:25,680 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:25,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:25,681 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:25,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:25,784 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:25,784 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:28:25,784 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:28:25,785 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:28:25,786 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:28:25,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:28:25,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:28:25,787 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 3 states. [2018-10-24 12:28:25,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:25,880 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-24 12:28:25,880 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:28:25,881 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2018-10-24 12:28:25,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:25,883 INFO L225 Difference]: With dead ends: 34 [2018-10-24 12:28:25,884 INFO L226 Difference]: Without dead ends: 25 [2018-10-24 12:28:25,885 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:28:25,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-24 12:28:25,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 20. [2018-10-24 12:28:25,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-24 12:28:25,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2018-10-24 12:28:25,892 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2018-10-24 12:28:25,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:25,892 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2018-10-24 12:28:25,892 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:28:25,893 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2018-10-24 12:28:25,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-24 12:28:25,893 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:25,894 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:25,894 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:25,894 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:25,895 INFO L82 PathProgramCache]: Analyzing trace with hash -1818930225, now seen corresponding path program 1 times [2018-10-24 12:28:25,895 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:25,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:25,896 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:25,897 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:25,897 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:25,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:26,018 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:26,020 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:26,020 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:26,023 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-10-24 12:28:26,026 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [38], [41], [43], [49], [50], [51], [53] [2018-10-24 12:28:26,066 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:28:26,067 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:28:26,379 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:28:26,382 INFO L272 AbstractInterpreter]: Visited 17 different actions 35 times. Merged at 7 different actions 12 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 30 variables. [2018-10-24 12:28:26,393 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:26,394 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:28:26,394 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:26,395 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:26,408 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:26,408 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:26,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:26,459 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:26,497 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:26,497 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:26,555 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:26,585 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:26,586 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2018-10-24 12:28:26,586 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:26,586 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:28:26,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:28:26,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:28:26,587 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 5 states. [2018-10-24 12:28:26,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:26,861 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2018-10-24 12:28:26,861 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:28:26,862 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2018-10-24 12:28:26,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:26,863 INFO L225 Difference]: With dead ends: 41 [2018-10-24 12:28:26,863 INFO L226 Difference]: Without dead ends: 32 [2018-10-24 12:28:26,865 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:28:26,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-24 12:28:26,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 23. [2018-10-24 12:28:26,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-24 12:28:26,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-10-24 12:28:26,874 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2018-10-24 12:28:26,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:26,874 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-10-24 12:28:26,875 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:28:26,876 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-10-24 12:28:26,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-24 12:28:26,877 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:26,877 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:26,877 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:26,878 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:26,879 INFO L82 PathProgramCache]: Analyzing trace with hash 377601812, now seen corresponding path program 2 times [2018-10-24 12:28:26,879 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:26,880 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:26,880 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:26,880 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:26,880 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:26,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:27,005 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:27,005 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:27,006 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:27,006 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:27,006 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:27,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:27,006 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:27,017 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:27,017 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:27,052 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2018-10-24 12:28:27,052 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:27,055 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:27,126 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-24 12:28:27,126 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:27,231 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-24 12:28:27,252 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-24 12:28:27,252 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5] total 11 [2018-10-24 12:28:27,252 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:28:27,253 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:28:27,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:28:27,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:28:27,254 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 5 states. [2018-10-24 12:28:27,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:27,430 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-10-24 12:28:27,432 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:28:27,432 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 21 [2018-10-24 12:28:27,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:27,433 INFO L225 Difference]: With dead ends: 31 [2018-10-24 12:28:27,433 INFO L226 Difference]: Without dead ends: 26 [2018-10-24 12:28:27,434 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:28:27,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-24 12:28:27,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2018-10-24 12:28:27,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-24 12:28:27,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2018-10-24 12:28:27,439 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 21 [2018-10-24 12:28:27,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:27,439 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2018-10-24 12:28:27,439 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:28:27,439 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2018-10-24 12:28:27,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-24 12:28:27,440 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:27,441 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:27,441 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:27,441 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:27,441 INFO L82 PathProgramCache]: Analyzing trace with hash 1343240274, now seen corresponding path program 1 times [2018-10-24 12:28:27,441 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:27,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:27,442 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:27,443 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:27,443 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:27,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:27,530 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:28:27,530 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:27,530 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:27,531 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-10-24 12:28:27,531 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [29], [31], [38], [41], [43], [49], [50], [51], [53] [2018-10-24 12:28:27,533 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:28:27,533 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:28:27,767 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:28:27,768 INFO L272 AbstractInterpreter]: Visited 19 different actions 49 times. Merged at 9 different actions 19 times. Never widened. Found 3 fixpoints after 2 different actions. Largest state had 31 variables. [2018-10-24 12:28:27,805 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:27,805 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:28:27,805 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:27,806 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:27,820 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:27,820 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:27,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:27,874 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:27,923 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:28:27,924 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:27,990 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:28:28,015 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:28,015 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-10-24 12:28:28,015 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:28,016 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:28:28,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:28:28,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:28:28,017 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 6 states. [2018-10-24 12:28:28,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:28,388 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2018-10-24 12:28:28,389 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:28:28,389 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 24 [2018-10-24 12:28:28,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:28,391 INFO L225 Difference]: With dead ends: 49 [2018-10-24 12:28:28,391 INFO L226 Difference]: Without dead ends: 38 [2018-10-24 12:28:28,392 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:28:28,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-24 12:28:28,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28. [2018-10-24 12:28:28,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-24 12:28:28,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2018-10-24 12:28:28,398 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 24 [2018-10-24 12:28:28,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:28,399 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2018-10-24 12:28:28,399 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:28:28,399 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2018-10-24 12:28:28,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-24 12:28:28,400 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:28,400 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:28,401 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:28,401 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:28,401 INFO L82 PathProgramCache]: Analyzing trace with hash 1859017687, now seen corresponding path program 2 times [2018-10-24 12:28:28,401 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:28,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:28,402 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:28,403 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:28,403 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:28,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:28,559 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:28:28,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:28,560 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:28,560 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:28,560 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:28,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:28,561 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:28,571 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:28,571 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:28,597 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-24 12:28:28,597 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:28,601 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:28,660 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:28:28,660 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:28,758 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:28:28,789 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:28,789 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 13 [2018-10-24 12:28:28,789 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:28,790 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:28:28,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:28:28,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:28:28,791 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 9 states. [2018-10-24 12:28:28,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:28,956 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2018-10-24 12:28:28,956 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:28:28,957 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2018-10-24 12:28:28,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:28,958 INFO L225 Difference]: With dead ends: 58 [2018-10-24 12:28:28,958 INFO L226 Difference]: Without dead ends: 42 [2018-10-24 12:28:28,959 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:28:28,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-24 12:28:28,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2018-10-24 12:28:28,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-24 12:28:28,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2018-10-24 12:28:28,965 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 27 [2018-10-24 12:28:28,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:28,966 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2018-10-24 12:28:28,966 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:28:28,966 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2018-10-24 12:28:28,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-24 12:28:28,967 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:28,967 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:28,968 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:28,968 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:28,968 INFO L82 PathProgramCache]: Analyzing trace with hash 192508852, now seen corresponding path program 3 times [2018-10-24 12:28:28,968 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:28,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:28,969 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:28,970 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:28,970 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:29,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:29,242 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:28:29,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:29,242 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:29,243 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:29,243 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:29,243 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:29,243 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:29,251 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:29,251 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:29,297 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:29,297 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:29,302 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:29,333 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:28:29,333 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:29,485 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:28:29,507 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:29,507 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-10-24 12:28:29,507 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:29,508 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:28:29,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:28:29,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:28:29,509 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 8 states. [2018-10-24 12:28:29,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:29,661 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2018-10-24 12:28:29,662 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:28:29,662 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 39 [2018-10-24 12:28:29,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:29,663 INFO L225 Difference]: With dead ends: 69 [2018-10-24 12:28:29,663 INFO L226 Difference]: Without dead ends: 49 [2018-10-24 12:28:29,664 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:28:29,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-24 12:28:29,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 43. [2018-10-24 12:28:29,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-24 12:28:29,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2018-10-24 12:28:29,670 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 39 [2018-10-24 12:28:29,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:29,670 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2018-10-24 12:28:29,670 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:28:29,670 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2018-10-24 12:28:29,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-10-24 12:28:29,671 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:29,671 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:29,672 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:29,672 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:29,672 INFO L82 PathProgramCache]: Analyzing trace with hash -82233969, now seen corresponding path program 4 times [2018-10-24 12:28:29,672 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:29,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:29,673 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:29,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:29,674 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:29,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:30,185 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:28:30,185 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:30,186 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:30,186 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:30,186 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:30,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:30,186 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:30,194 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:30,194 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:30,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:30,242 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:30,270 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:28:30,270 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:30,412 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:28:30,433 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:30,433 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-10-24 12:28:30,433 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:30,433 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:28:30,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:28:30,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:28:30,434 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 9 states. [2018-10-24 12:28:30,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:30,647 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2018-10-24 12:28:30,647 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:28:30,647 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 42 [2018-10-24 12:28:30,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:30,649 INFO L225 Difference]: With dead ends: 76 [2018-10-24 12:28:30,649 INFO L226 Difference]: Without dead ends: 56 [2018-10-24 12:28:30,650 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:28:30,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-10-24 12:28:30,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 46. [2018-10-24 12:28:30,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-24 12:28:30,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2018-10-24 12:28:30,656 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 42 [2018-10-24 12:28:30,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:30,657 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2018-10-24 12:28:30,657 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:28:30,657 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2018-10-24 12:28:30,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-24 12:28:30,658 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:30,658 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:30,658 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:30,659 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:30,659 INFO L82 PathProgramCache]: Analyzing trace with hash 1262051796, now seen corresponding path program 5 times [2018-10-24 12:28:30,659 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:30,660 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:30,660 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:30,660 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:30,660 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:30,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:30,792 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:28:30,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:30,792 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:30,792 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:30,793 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:30,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:30,793 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:30,801 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:30,801 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:30,848 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-24 12:28:30,848 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:30,852 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:30,916 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-24 12:28:30,916 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:31,100 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-24 12:28:31,122 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:31,122 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 19 [2018-10-24 12:28:31,122 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:31,123 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:28:31,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:28:31,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=227, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:28:31,124 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 12 states. [2018-10-24 12:28:31,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:31,293 INFO L93 Difference]: Finished difference Result 85 states and 90 transitions. [2018-10-24 12:28:31,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:28:31,296 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 45 [2018-10-24 12:28:31,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:31,296 INFO L225 Difference]: With dead ends: 85 [2018-10-24 12:28:31,296 INFO L226 Difference]: Without dead ends: 60 [2018-10-24 12:28:31,297 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=121, Invalid=259, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:28:31,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-24 12:28:31,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2018-10-24 12:28:31,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-24 12:28:31,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2018-10-24 12:28:31,303 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 45 [2018-10-24 12:28:31,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:31,304 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2018-10-24 12:28:31,304 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:28:31,304 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2018-10-24 12:28:31,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-24 12:28:31,305 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:31,305 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:31,306 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:31,306 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:31,306 INFO L82 PathProgramCache]: Analyzing trace with hash -65813737, now seen corresponding path program 6 times [2018-10-24 12:28:31,306 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:31,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:31,307 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:31,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:31,308 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:31,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:31,521 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:28:31,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:31,521 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:31,521 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:31,522 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:31,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:31,522 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:31,532 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:31,532 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:31,581 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:31,581 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:31,585 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:31,611 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:28:31,612 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:31,794 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:28:31,815 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:31,816 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-10-24 12:28:31,816 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:31,816 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:28:31,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:28:31,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:28:31,817 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand 11 states. [2018-10-24 12:28:31,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:31,967 INFO L93 Difference]: Finished difference Result 96 states and 99 transitions. [2018-10-24 12:28:31,969 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:28:31,969 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 57 [2018-10-24 12:28:31,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:31,971 INFO L225 Difference]: With dead ends: 96 [2018-10-24 12:28:31,971 INFO L226 Difference]: Without dead ends: 67 [2018-10-24 12:28:31,972 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:28:31,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-24 12:28:31,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 61. [2018-10-24 12:28:31,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-10-24 12:28:31,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2018-10-24 12:28:31,979 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 57 [2018-10-24 12:28:31,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:31,980 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2018-10-24 12:28:31,980 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:28:31,980 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2018-10-24 12:28:31,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-10-24 12:28:31,981 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:31,982 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:31,982 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:31,982 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:31,982 INFO L82 PathProgramCache]: Analyzing trace with hash 1181148210, now seen corresponding path program 7 times [2018-10-24 12:28:31,982 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:31,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:31,983 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:31,984 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:31,984 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:32,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:32,169 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:28:32,169 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:32,169 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:32,169 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:32,170 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:32,170 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:32,170 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:32,178 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:32,178 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:32,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:32,234 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:32,301 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:28:32,302 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:32,646 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:28:32,666 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:32,666 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-10-24 12:28:32,667 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:32,667 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:28:32,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:28:32,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:28:32,670 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand 12 states. [2018-10-24 12:28:32,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:32,805 INFO L93 Difference]: Finished difference Result 103 states and 107 transitions. [2018-10-24 12:28:32,806 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:28:32,806 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 60 [2018-10-24 12:28:32,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:32,808 INFO L225 Difference]: With dead ends: 103 [2018-10-24 12:28:32,808 INFO L226 Difference]: Without dead ends: 74 [2018-10-24 12:28:32,809 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:28:32,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-24 12:28:32,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 64. [2018-10-24 12:28:32,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-10-24 12:28:32,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2018-10-24 12:28:32,815 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 60 [2018-10-24 12:28:32,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:32,816 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2018-10-24 12:28:32,816 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:28:32,816 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2018-10-24 12:28:32,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-10-24 12:28:32,817 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:32,817 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:32,818 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:32,818 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:32,818 INFO L82 PathProgramCache]: Analyzing trace with hash -2042599113, now seen corresponding path program 8 times [2018-10-24 12:28:32,818 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:32,819 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:32,819 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:32,819 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:32,819 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:32,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:33,180 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:28:33,181 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:33,181 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:33,181 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:33,181 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:33,181 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:33,181 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:33,191 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:33,191 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:33,257 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-24 12:28:33,258 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:33,262 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:33,412 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-24 12:28:33,412 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:33,632 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-24 12:28:33,653 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:33,653 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 25 [2018-10-24 12:28:33,653 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:33,654 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:28:33,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:28:33,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=380, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:28:33,655 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand 15 states. [2018-10-24 12:28:33,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:33,858 INFO L93 Difference]: Finished difference Result 112 states and 117 transitions. [2018-10-24 12:28:33,858 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:28:33,858 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 63 [2018-10-24 12:28:33,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:33,860 INFO L225 Difference]: With dead ends: 112 [2018-10-24 12:28:33,860 INFO L226 Difference]: Without dead ends: 78 [2018-10-24 12:28:33,862 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=226, Invalid=424, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:28:33,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-24 12:28:33,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2018-10-24 12:28:33,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-10-24 12:28:33,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2018-10-24 12:28:33,868 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 63 [2018-10-24 12:28:33,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:33,868 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2018-10-24 12:28:33,869 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:28:33,869 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2018-10-24 12:28:33,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-10-24 12:28:33,870 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:33,870 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:33,870 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:33,870 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:33,871 INFO L82 PathProgramCache]: Analyzing trace with hash -1037724716, now seen corresponding path program 9 times [2018-10-24 12:28:33,871 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:33,871 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:33,872 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:33,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:33,872 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:33,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:34,131 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:28:34,131 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:34,131 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:34,132 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:34,132 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:34,132 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:34,132 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:34,141 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:34,141 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:34,211 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:34,211 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:34,215 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:34,335 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:28:34,335 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:34,593 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:28:34,614 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:34,614 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-10-24 12:28:34,614 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:34,615 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:28:34,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:28:34,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:28:34,616 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand 14 states. [2018-10-24 12:28:34,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:34,782 INFO L93 Difference]: Finished difference Result 123 states and 126 transitions. [2018-10-24 12:28:34,783 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:28:34,783 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 75 [2018-10-24 12:28:34,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:34,784 INFO L225 Difference]: With dead ends: 123 [2018-10-24 12:28:34,784 INFO L226 Difference]: Without dead ends: 85 [2018-10-24 12:28:34,785 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:28:34,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-24 12:28:34,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 79. [2018-10-24 12:28:34,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-24 12:28:34,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-10-24 12:28:34,791 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 75 [2018-10-24 12:28:34,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:34,792 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-10-24 12:28:34,792 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:28:34,792 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-10-24 12:28:34,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-10-24 12:28:34,793 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:34,793 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:34,794 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:34,794 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:34,794 INFO L82 PathProgramCache]: Analyzing trace with hash -448084945, now seen corresponding path program 10 times [2018-10-24 12:28:34,794 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:34,795 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:34,795 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:34,795 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:34,795 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:34,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:35,028 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:28:35,028 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:35,028 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:35,028 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:35,029 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:35,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:35,029 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:35,037 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:35,037 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:35,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:35,106 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:35,169 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:28:35,170 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:35,505 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:28:35,526 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:35,526 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-10-24 12:28:35,526 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:35,526 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:28:35,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:28:35,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:28:35,527 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 15 states. [2018-10-24 12:28:35,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:35,674 INFO L93 Difference]: Finished difference Result 130 states and 134 transitions. [2018-10-24 12:28:35,675 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:28:35,675 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 78 [2018-10-24 12:28:35,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:35,676 INFO L225 Difference]: With dead ends: 130 [2018-10-24 12:28:35,677 INFO L226 Difference]: Without dead ends: 92 [2018-10-24 12:28:35,678 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:28:35,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-10-24 12:28:35,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 82. [2018-10-24 12:28:35,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-10-24 12:28:35,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2018-10-24 12:28:35,684 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 78 [2018-10-24 12:28:35,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:35,685 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2018-10-24 12:28:35,685 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:28:35,685 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2018-10-24 12:28:35,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-10-24 12:28:35,686 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:35,686 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:35,686 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:35,687 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:35,687 INFO L82 PathProgramCache]: Analyzing trace with hash -905907724, now seen corresponding path program 11 times [2018-10-24 12:28:35,687 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:35,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:35,688 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:35,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:35,688 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:35,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:35,888 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:28:35,888 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:35,888 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:35,888 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:35,888 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:35,888 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:35,889 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:35,896 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:35,896 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:36,019 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-24 12:28:36,019 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:36,023 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:36,097 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-24 12:28:36,097 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:36,659 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-24 12:28:36,680 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:36,680 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 31 [2018-10-24 12:28:36,681 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:36,681 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:28:36,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:28:36,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=569, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:28:36,682 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand 18 states. [2018-10-24 12:28:36,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:36,845 INFO L93 Difference]: Finished difference Result 139 states and 144 transitions. [2018-10-24 12:28:36,846 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:28:36,846 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 81 [2018-10-24 12:28:36,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:36,847 INFO L225 Difference]: With dead ends: 139 [2018-10-24 12:28:36,847 INFO L226 Difference]: Without dead ends: 96 [2018-10-24 12:28:36,849 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=367, Invalid=625, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:28:36,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-24 12:28:36,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 94. [2018-10-24 12:28:36,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-10-24 12:28:36,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2018-10-24 12:28:36,855 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 81 [2018-10-24 12:28:36,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:36,856 INFO L481 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2018-10-24 12:28:36,856 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:28:36,856 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2018-10-24 12:28:36,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-10-24 12:28:36,857 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:36,857 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:36,858 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:36,858 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:36,858 INFO L82 PathProgramCache]: Analyzing trace with hash 773593207, now seen corresponding path program 12 times [2018-10-24 12:28:36,858 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:36,859 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:36,859 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:36,859 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:36,860 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:36,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:37,852 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:28:37,852 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:37,852 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:37,852 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:37,853 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:37,853 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:37,853 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:37,865 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:37,865 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:37,939 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:37,939 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:37,942 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:37,959 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:28:37,960 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:38,280 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:28:38,302 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:38,303 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-10-24 12:28:38,303 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:38,303 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:28:38,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:28:38,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:28:38,304 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand 17 states. [2018-10-24 12:28:38,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:38,454 INFO L93 Difference]: Finished difference Result 150 states and 153 transitions. [2018-10-24 12:28:38,455 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:28:38,455 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 93 [2018-10-24 12:28:38,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:38,456 INFO L225 Difference]: With dead ends: 150 [2018-10-24 12:28:38,456 INFO L226 Difference]: Without dead ends: 103 [2018-10-24 12:28:38,457 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:28:38,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-24 12:28:38,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 97. [2018-10-24 12:28:38,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-10-24 12:28:38,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-10-24 12:28:38,466 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 93 [2018-10-24 12:28:38,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:38,466 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-10-24 12:28:38,466 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:28:38,466 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-10-24 12:28:38,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-24 12:28:38,468 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:38,468 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:38,468 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:38,468 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:38,468 INFO L82 PathProgramCache]: Analyzing trace with hash -1075443694, now seen corresponding path program 13 times [2018-10-24 12:28:38,469 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:38,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:38,469 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:38,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:38,470 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:38,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:38,726 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:28:38,727 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:38,727 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:38,727 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:38,727 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:38,727 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:38,727 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:38,736 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:38,736 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:38,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:38,816 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:38,854 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:28:38,854 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:39,406 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:28:39,426 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:39,426 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-10-24 12:28:39,427 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:39,427 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:28:39,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:28:39,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:28:39,428 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 18 states. [2018-10-24 12:28:39,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:39,694 INFO L93 Difference]: Finished difference Result 157 states and 161 transitions. [2018-10-24 12:28:39,694 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:28:39,694 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 96 [2018-10-24 12:28:39,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:39,696 INFO L225 Difference]: With dead ends: 157 [2018-10-24 12:28:39,696 INFO L226 Difference]: Without dead ends: 110 [2018-10-24 12:28:39,697 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 177 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:28:39,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2018-10-24 12:28:39,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 100. [2018-10-24 12:28:39,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-10-24 12:28:39,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2018-10-24 12:28:39,701 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 96 [2018-10-24 12:28:39,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:39,702 INFO L481 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2018-10-24 12:28:39,702 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:28:39,702 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2018-10-24 12:28:39,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:28:39,703 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:39,703 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:39,704 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:39,704 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:39,704 INFO L82 PathProgramCache]: Analyzing trace with hash 1516777111, now seen corresponding path program 14 times [2018-10-24 12:28:39,704 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:39,705 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:39,705 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:39,705 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:39,705 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:39,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:39,991 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:28:39,991 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:39,992 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:39,992 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:39,992 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:39,992 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:39,992 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:40,005 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:40,006 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:40,230 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-10-24 12:28:40,230 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:40,238 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:40,315 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-24 12:28:40,315 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:40,862 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-24 12:28:40,884 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:40,884 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 37 [2018-10-24 12:28:40,885 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:40,885 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:28:40,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:28:40,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=538, Invalid=794, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:28:40,886 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand 21 states. [2018-10-24 12:28:41,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:41,077 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2018-10-24 12:28:41,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:28:41,077 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 99 [2018-10-24 12:28:41,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:41,078 INFO L225 Difference]: With dead ends: 166 [2018-10-24 12:28:41,078 INFO L226 Difference]: Without dead ends: 114 [2018-10-24 12:28:41,079 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=544, Invalid=862, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:28:41,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-24 12:28:41,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2018-10-24 12:28:41,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-10-24 12:28:41,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2018-10-24 12:28:41,084 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 99 [2018-10-24 12:28:41,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:41,085 INFO L481 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2018-10-24 12:28:41,085 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:28:41,085 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2018-10-24 12:28:41,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-10-24 12:28:41,086 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:41,086 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:41,086 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:41,086 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:41,087 INFO L82 PathProgramCache]: Analyzing trace with hash 280509428, now seen corresponding path program 15 times [2018-10-24 12:28:41,087 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:41,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:41,088 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:41,088 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:41,088 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:41,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:41,791 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:28:41,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:41,791 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:41,791 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:41,791 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:41,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:41,792 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:41,800 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:41,800 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:41,880 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:41,880 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:41,884 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:41,917 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:28:41,917 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:42,688 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:28:42,709 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:42,709 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-10-24 12:28:42,709 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:42,710 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:28:42,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:28:42,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:28:42,711 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand 20 states. [2018-10-24 12:28:42,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:42,905 INFO L93 Difference]: Finished difference Result 177 states and 180 transitions. [2018-10-24 12:28:42,905 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:28:42,905 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 111 [2018-10-24 12:28:42,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:42,907 INFO L225 Difference]: With dead ends: 177 [2018-10-24 12:28:42,907 INFO L226 Difference]: Without dead ends: 121 [2018-10-24 12:28:42,908 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:28:42,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-10-24 12:28:42,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 115. [2018-10-24 12:28:42,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-24 12:28:42,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 116 transitions. [2018-10-24 12:28:42,912 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 116 transitions. Word has length 111 [2018-10-24 12:28:42,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:42,912 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 116 transitions. [2018-10-24 12:28:42,912 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:28:42,913 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 116 transitions. [2018-10-24 12:28:42,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-10-24 12:28:42,913 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:42,914 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:42,914 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:42,914 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:42,914 INFO L82 PathProgramCache]: Analyzing trace with hash -1179804977, now seen corresponding path program 16 times [2018-10-24 12:28:42,914 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:42,915 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:42,915 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:42,915 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:42,915 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:42,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:43,553 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:28:43,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:43,553 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:43,553 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:43,553 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:43,554 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:43,554 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:43,563 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:43,564 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:43,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:43,645 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:43,702 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:28:43,702 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:44,408 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:28:44,429 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:44,429 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-10-24 12:28:44,429 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:44,430 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:28:44,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:28:44,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:28:44,431 INFO L87 Difference]: Start difference. First operand 115 states and 116 transitions. Second operand 21 states. [2018-10-24 12:28:44,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:44,630 INFO L93 Difference]: Finished difference Result 184 states and 188 transitions. [2018-10-24 12:28:44,631 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:28:44,631 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 114 [2018-10-24 12:28:44,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:44,632 INFO L225 Difference]: With dead ends: 184 [2018-10-24 12:28:44,633 INFO L226 Difference]: Without dead ends: 128 [2018-10-24 12:28:44,634 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:28:44,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-10-24 12:28:44,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 118. [2018-10-24 12:28:44,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-10-24 12:28:44,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2018-10-24 12:28:44,638 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 114 [2018-10-24 12:28:44,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:44,638 INFO L481 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2018-10-24 12:28:44,638 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:28:44,639 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2018-10-24 12:28:44,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-10-24 12:28:44,639 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:44,639 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:44,640 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:44,640 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:44,640 INFO L82 PathProgramCache]: Analyzing trace with hash -1682503148, now seen corresponding path program 17 times [2018-10-24 12:28:44,640 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:44,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:44,641 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:44,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:44,641 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:44,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:44,997 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:28:44,997 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:44,997 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:44,998 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:44,998 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:44,998 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:44,998 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:45,007 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:45,008 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:45,244 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2018-10-24 12:28:45,245 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:45,249 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:45,345 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-10-24 12:28:45,345 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:45,981 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-10-24 12:28:46,003 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:46,003 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 43 [2018-10-24 12:28:46,003 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:46,004 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:28:46,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:28:46,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=751, Invalid=1055, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:28:46,005 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand 24 states. [2018-10-24 12:28:46,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:46,230 INFO L93 Difference]: Finished difference Result 193 states and 198 transitions. [2018-10-24 12:28:46,230 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:28:46,230 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 117 [2018-10-24 12:28:46,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:46,232 INFO L225 Difference]: With dead ends: 193 [2018-10-24 12:28:46,232 INFO L226 Difference]: Without dead ends: 132 [2018-10-24 12:28:46,234 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=757, Invalid=1135, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:28:46,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-10-24 12:28:46,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 130. [2018-10-24 12:28:46,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-10-24 12:28:46,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2018-10-24 12:28:46,238 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 117 [2018-10-24 12:28:46,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:46,238 INFO L481 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2018-10-24 12:28:46,238 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:28:46,238 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2018-10-24 12:28:46,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:28:46,239 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:46,239 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:46,239 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:46,240 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:46,240 INFO L82 PathProgramCache]: Analyzing trace with hash 1944856023, now seen corresponding path program 18 times [2018-10-24 12:28:46,240 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:46,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:46,241 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:46,241 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:46,241 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:46,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:46,941 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:28:46,941 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:46,941 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:46,941 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:46,941 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:46,942 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:46,942 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:46,951 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:46,951 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:47,041 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:47,041 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:47,045 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:47,076 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:28:47,076 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:47,530 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:28:47,551 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:47,551 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-10-24 12:28:47,551 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:47,552 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:28:47,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:28:47,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:28:47,553 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand 23 states. [2018-10-24 12:28:47,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:47,897 INFO L93 Difference]: Finished difference Result 204 states and 207 transitions. [2018-10-24 12:28:47,902 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:28:47,902 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 129 [2018-10-24 12:28:47,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:47,903 INFO L225 Difference]: With dead ends: 204 [2018-10-24 12:28:47,903 INFO L226 Difference]: Without dead ends: 139 [2018-10-24 12:28:47,904 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 238 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:28:47,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-24 12:28:47,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 133. [2018-10-24 12:28:47,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-10-24 12:28:47,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 134 transitions. [2018-10-24 12:28:47,909 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 134 transitions. Word has length 129 [2018-10-24 12:28:47,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:47,909 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 134 transitions. [2018-10-24 12:28:47,909 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:28:47,909 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 134 transitions. [2018-10-24 12:28:47,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-10-24 12:28:47,910 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:47,910 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:47,911 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:47,911 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:47,911 INFO L82 PathProgramCache]: Analyzing trace with hash 709338098, now seen corresponding path program 19 times [2018-10-24 12:28:47,911 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:47,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:47,912 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:47,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:47,912 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:47,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:48,431 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:28:48,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:48,431 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:48,431 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:48,432 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:48,432 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:48,432 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:48,440 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:48,440 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:48,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:48,540 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:48,561 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:28:48,562 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:49,072 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:28:49,093 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:49,093 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-10-24 12:28:49,093 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:49,094 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:28:49,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:28:49,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:28:49,095 INFO L87 Difference]: Start difference. First operand 133 states and 134 transitions. Second operand 24 states. [2018-10-24 12:28:49,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:49,282 INFO L93 Difference]: Finished difference Result 211 states and 215 transitions. [2018-10-24 12:28:49,283 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:28:49,283 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 132 [2018-10-24 12:28:49,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:49,284 INFO L225 Difference]: With dead ends: 211 [2018-10-24 12:28:49,284 INFO L226 Difference]: Without dead ends: 146 [2018-10-24 12:28:49,286 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:28:49,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2018-10-24 12:28:49,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 136. [2018-10-24 12:28:49,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-10-24 12:28:49,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2018-10-24 12:28:49,290 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 132 [2018-10-24 12:28:49,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:49,291 INFO L481 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2018-10-24 12:28:49,291 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:28:49,291 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2018-10-24 12:28:49,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-10-24 12:28:49,292 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:49,292 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:49,292 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:49,292 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:49,292 INFO L82 PathProgramCache]: Analyzing trace with hash 1264561143, now seen corresponding path program 20 times [2018-10-24 12:28:49,293 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:49,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:49,293 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:49,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:49,293 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:49,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:49,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1223 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:28:49,637 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:49,637 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:49,637 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:49,637 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:49,637 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:49,637 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:49,648 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:49,648 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:50,126 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2018-10-24 12:28:50,127 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:50,131 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:50,243 INFO L134 CoverageAnalysis]: Checked inductivity of 1223 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-10-24 12:28:50,244 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:50,815 INFO L134 CoverageAnalysis]: Checked inductivity of 1223 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-10-24 12:28:50,836 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:50,836 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 49 [2018-10-24 12:28:50,836 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:50,837 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:28:50,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:28:50,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1000, Invalid=1352, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:28:50,838 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand 27 states. [2018-10-24 12:28:51,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:51,132 INFO L93 Difference]: Finished difference Result 220 states and 225 transitions. [2018-10-24 12:28:51,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:28:51,133 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 135 [2018-10-24 12:28:51,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:51,135 INFO L225 Difference]: With dead ends: 220 [2018-10-24 12:28:51,135 INFO L226 Difference]: Without dead ends: 150 [2018-10-24 12:28:51,136 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 246 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1006, Invalid=1444, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:28:51,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-10-24 12:28:51,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 148. [2018-10-24 12:28:51,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2018-10-24 12:28:51,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 149 transitions. [2018-10-24 12:28:51,141 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 149 transitions. Word has length 135 [2018-10-24 12:28:51,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:51,141 INFO L481 AbstractCegarLoop]: Abstraction has 148 states and 149 transitions. [2018-10-24 12:28:51,142 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:28:51,142 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 149 transitions. [2018-10-24 12:28:51,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-10-24 12:28:51,142 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:51,143 INFO L375 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:51,143 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:51,143 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:51,143 INFO L82 PathProgramCache]: Analyzing trace with hash 1991732244, now seen corresponding path program 21 times [2018-10-24 12:28:51,143 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:51,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:51,144 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:51,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:51,144 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:51,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:51,522 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:28:51,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:51,523 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:51,523 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:51,523 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:51,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:51,523 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:51,530 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:51,530 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:51,639 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:51,639 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:51,644 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:51,695 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:28:51,695 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:52,495 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:28:52,515 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:52,516 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-10-24 12:28:52,516 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:52,516 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:28:52,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:28:52,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:28:52,518 INFO L87 Difference]: Start difference. First operand 148 states and 149 transitions. Second operand 26 states. [2018-10-24 12:28:52,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:52,823 INFO L93 Difference]: Finished difference Result 231 states and 234 transitions. [2018-10-24 12:28:52,823 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:28:52,824 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 147 [2018-10-24 12:28:52,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:52,825 INFO L225 Difference]: With dead ends: 231 [2018-10-24 12:28:52,825 INFO L226 Difference]: Without dead ends: 157 [2018-10-24 12:28:52,826 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 271 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:28:52,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-24 12:28:52,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 151. [2018-10-24 12:28:52,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-10-24 12:28:52,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 152 transitions. [2018-10-24 12:28:52,831 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 152 transitions. Word has length 147 [2018-10-24 12:28:52,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:52,831 INFO L481 AbstractCegarLoop]: Abstraction has 151 states and 152 transitions. [2018-10-24 12:28:52,831 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:28:52,831 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 152 transitions. [2018-10-24 12:28:52,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-10-24 12:28:52,832 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:52,832 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:52,833 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:52,833 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:52,833 INFO L82 PathProgramCache]: Analyzing trace with hash -110642833, now seen corresponding path program 22 times [2018-10-24 12:28:52,833 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:52,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:52,834 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:52,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:52,834 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:52,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:53,728 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:28:53,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:53,728 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:53,728 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:53,729 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:53,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:53,729 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:53,738 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:53,738 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:53,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:53,850 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:53,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:28:53,886 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:54,544 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:28:54,566 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:54,566 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-10-24 12:28:54,566 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:54,567 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:28:54,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:28:54,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:28:54,568 INFO L87 Difference]: Start difference. First operand 151 states and 152 transitions. Second operand 27 states. [2018-10-24 12:28:54,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:54,815 INFO L93 Difference]: Finished difference Result 238 states and 242 transitions. [2018-10-24 12:28:54,818 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:28:54,818 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 150 [2018-10-24 12:28:54,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:54,820 INFO L225 Difference]: With dead ends: 238 [2018-10-24 12:28:54,820 INFO L226 Difference]: Without dead ends: 164 [2018-10-24 12:28:54,821 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 276 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:28:54,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2018-10-24 12:28:54,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 154. [2018-10-24 12:28:54,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:28:54,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 155 transitions. [2018-10-24 12:28:54,826 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 155 transitions. Word has length 150 [2018-10-24 12:28:54,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:54,827 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 155 transitions. [2018-10-24 12:28:54,827 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:28:54,827 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 155 transitions. [2018-10-24 12:28:54,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-10-24 12:28:54,828 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:54,828 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:54,828 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:54,829 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:54,829 INFO L82 PathProgramCache]: Analyzing trace with hash 1541515828, now seen corresponding path program 23 times [2018-10-24 12:28:54,829 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:54,830 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:54,830 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:54,830 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:54,830 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:54,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:55,444 INFO L134 CoverageAnalysis]: Checked inductivity of 1613 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:28:55,445 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:55,445 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:55,445 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:55,445 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:55,445 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:55,445 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:55,455 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:55,456 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:56,236 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-10-24 12:28:56,237 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:56,243 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:57,100 INFO L134 CoverageAnalysis]: Checked inductivity of 1613 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-24 12:28:57,101 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:58,063 INFO L134 CoverageAnalysis]: Checked inductivity of 1613 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-24 12:28:58,086 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:58,086 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 55 [2018-10-24 12:28:58,086 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:58,086 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:28:58,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:28:58,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1285, Invalid=1685, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:28:58,088 INFO L87 Difference]: Start difference. First operand 154 states and 155 transitions. Second operand 30 states. [2018-10-24 12:28:59,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:59,538 INFO L93 Difference]: Finished difference Result 247 states and 252 transitions. [2018-10-24 12:28:59,539 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:28:59,539 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 153 [2018-10-24 12:28:59,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:59,541 INFO L225 Difference]: With dead ends: 247 [2018-10-24 12:28:59,541 INFO L226 Difference]: Without dead ends: 168 [2018-10-24 12:28:59,543 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1291, Invalid=1789, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:28:59,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2018-10-24 12:28:59,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 166. [2018-10-24 12:28:59,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-10-24 12:28:59,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 167 transitions. [2018-10-24 12:28:59,549 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 167 transitions. Word has length 153 [2018-10-24 12:28:59,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:59,549 INFO L481 AbstractCegarLoop]: Abstraction has 166 states and 167 transitions. [2018-10-24 12:28:59,549 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:28:59,549 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 167 transitions. [2018-10-24 12:28:59,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-10-24 12:28:59,550 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:59,550 INFO L375 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:59,550 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:59,550 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:59,551 INFO L82 PathProgramCache]: Analyzing trace with hash 1394469687, now seen corresponding path program 24 times [2018-10-24 12:28:59,551 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:59,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:59,552 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:59,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:59,552 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:59,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:01,549 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:29:01,549 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:01,550 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:01,550 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:01,550 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:01,550 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:01,550 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:01,559 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:01,559 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:01,665 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:01,665 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:01,669 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:01,706 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:29:01,707 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:03,477 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:29:03,497 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:03,498 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-10-24 12:29:03,498 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:03,498 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:29:03,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:29:03,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:29:03,500 INFO L87 Difference]: Start difference. First operand 166 states and 167 transitions. Second operand 29 states. [2018-10-24 12:29:03,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:03,754 INFO L93 Difference]: Finished difference Result 258 states and 261 transitions. [2018-10-24 12:29:03,754 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:29:03,754 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 165 [2018-10-24 12:29:03,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:03,756 INFO L225 Difference]: With dead ends: 258 [2018-10-24 12:29:03,756 INFO L226 Difference]: Without dead ends: 175 [2018-10-24 12:29:03,758 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 304 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:29:03,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-10-24 12:29:03,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 169. [2018-10-24 12:29:03,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-10-24 12:29:03,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2018-10-24 12:29:03,763 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 165 [2018-10-24 12:29:03,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:03,763 INFO L481 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2018-10-24 12:29:03,764 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:29:03,764 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2018-10-24 12:29:03,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-10-24 12:29:03,765 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:03,765 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:03,765 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:03,765 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:03,765 INFO L82 PathProgramCache]: Analyzing trace with hash -456804398, now seen corresponding path program 25 times [2018-10-24 12:29:03,766 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:03,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:03,766 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:03,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:03,767 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:03,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:04,227 INFO L134 CoverageAnalysis]: Checked inductivity of 1977 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:29:04,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:04,227 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:04,227 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:04,228 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:04,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:04,228 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:04,235 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:04,235 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:04,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:04,361 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:04,400 INFO L134 CoverageAnalysis]: Checked inductivity of 1977 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:29:04,400 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:05,494 INFO L134 CoverageAnalysis]: Checked inductivity of 1977 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:29:05,516 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:05,516 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-10-24 12:29:05,516 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:05,516 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:29:05,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:29:05,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:29:05,518 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand 30 states. [2018-10-24 12:29:05,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:05,960 INFO L93 Difference]: Finished difference Result 265 states and 269 transitions. [2018-10-24 12:29:05,960 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:29:05,960 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 168 [2018-10-24 12:29:05,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:05,961 INFO L225 Difference]: With dead ends: 265 [2018-10-24 12:29:05,962 INFO L226 Difference]: Without dead ends: 182 [2018-10-24 12:29:05,962 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 309 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:29:05,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-10-24 12:29:05,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 172. [2018-10-24 12:29:05,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-10-24 12:29:05,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 173 transitions. [2018-10-24 12:29:05,969 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 173 transitions. Word has length 168 [2018-10-24 12:29:05,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:05,970 INFO L481 AbstractCegarLoop]: Abstraction has 172 states and 173 transitions. [2018-10-24 12:29:05,970 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:29:05,970 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 173 transitions. [2018-10-24 12:29:05,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2018-10-24 12:29:05,972 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:05,972 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:05,973 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:05,973 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:05,973 INFO L82 PathProgramCache]: Analyzing trace with hash -88022697, now seen corresponding path program 26 times [2018-10-24 12:29:05,973 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:05,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:05,974 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:05,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:05,974 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:06,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:06,469 INFO L134 CoverageAnalysis]: Checked inductivity of 2057 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:29:06,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:06,470 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:06,470 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:06,470 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:06,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:06,470 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:06,481 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:06,481 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:29:07,734 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2018-10-24 12:29:07,734 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:07,740 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:07,825 INFO L134 CoverageAnalysis]: Checked inductivity of 2057 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-24 12:29:07,825 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:08,881 INFO L134 CoverageAnalysis]: Checked inductivity of 2057 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-24 12:29:08,904 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:08,905 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 61 [2018-10-24 12:29:08,905 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:08,905 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:29:08,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:29:08,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1606, Invalid=2054, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:29:08,906 INFO L87 Difference]: Start difference. First operand 172 states and 173 transitions. Second operand 33 states. [2018-10-24 12:29:09,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:09,239 INFO L93 Difference]: Finished difference Result 274 states and 279 transitions. [2018-10-24 12:29:09,240 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:29:09,240 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 171 [2018-10-24 12:29:09,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:09,241 INFO L225 Difference]: With dead ends: 274 [2018-10-24 12:29:09,241 INFO L226 Difference]: Without dead ends: 186 [2018-10-24 12:29:09,242 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 312 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1612, Invalid=2170, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:29:09,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-10-24 12:29:09,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 184. [2018-10-24 12:29:09,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-10-24 12:29:09,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 185 transitions. [2018-10-24 12:29:09,248 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 185 transitions. Word has length 171 [2018-10-24 12:29:09,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:09,248 INFO L481 AbstractCegarLoop]: Abstraction has 184 states and 185 transitions. [2018-10-24 12:29:09,248 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:29:09,248 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 185 transitions. [2018-10-24 12:29:09,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2018-10-24 12:29:09,249 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:09,250 INFO L375 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:09,250 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:09,250 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:09,250 INFO L82 PathProgramCache]: Analyzing trace with hash 841557044, now seen corresponding path program 27 times [2018-10-24 12:29:09,250 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:09,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:09,251 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:09,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:09,251 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:09,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:10,002 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:29:10,002 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:10,002 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:10,002 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:10,002 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:10,002 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:10,002 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:10,009 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:10,010 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:10,142 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:10,143 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:10,147 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:10,188 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:29:10,189 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:11,141 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:29:11,164 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:11,164 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-10-24 12:29:11,164 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:11,164 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:29:11,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:29:11,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:29:11,166 INFO L87 Difference]: Start difference. First operand 184 states and 185 transitions. Second operand 32 states. [2018-10-24 12:29:11,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:11,519 INFO L93 Difference]: Finished difference Result 285 states and 288 transitions. [2018-10-24 12:29:11,520 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:29:11,520 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 183 [2018-10-24 12:29:11,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:11,522 INFO L225 Difference]: With dead ends: 285 [2018-10-24 12:29:11,522 INFO L226 Difference]: Without dead ends: 193 [2018-10-24 12:29:11,524 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 337 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:29:11,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-10-24 12:29:11,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 187. [2018-10-24 12:29:11,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-10-24 12:29:11,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 188 transitions. [2018-10-24 12:29:11,530 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 188 transitions. Word has length 183 [2018-10-24 12:29:11,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:11,530 INFO L481 AbstractCegarLoop]: Abstraction has 187 states and 188 transitions. [2018-10-24 12:29:11,530 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:29:11,530 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 188 transitions. [2018-10-24 12:29:11,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-10-24 12:29:11,532 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:11,532 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:11,532 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:11,532 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:11,533 INFO L82 PathProgramCache]: Analyzing trace with hash -1809899505, now seen corresponding path program 28 times [2018-10-24 12:29:11,533 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:11,533 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:11,534 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:11,534 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:11,534 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:11,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:12,736 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:29:12,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:12,736 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:12,736 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:12,736 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:12,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:12,737 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:12,751 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:12,752 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:12,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:12,889 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:12,928 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:29:12,928 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:14,028 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:29:14,049 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:14,049 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2018-10-24 12:29:14,049 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:14,050 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:29:14,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:29:14,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:29:14,051 INFO L87 Difference]: Start difference. First operand 187 states and 188 transitions. Second operand 33 states. [2018-10-24 12:29:14,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:14,353 INFO L93 Difference]: Finished difference Result 292 states and 296 transitions. [2018-10-24 12:29:14,354 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:29:14,354 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 186 [2018-10-24 12:29:14,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:14,356 INFO L225 Difference]: With dead ends: 292 [2018-10-24 12:29:14,356 INFO L226 Difference]: Without dead ends: 200 [2018-10-24 12:29:14,357 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:29:14,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2018-10-24 12:29:14,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 190. [2018-10-24 12:29:14,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2018-10-24 12:29:14,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 191 transitions. [2018-10-24 12:29:14,363 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 191 transitions. Word has length 186 [2018-10-24 12:29:14,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:14,363 INFO L481 AbstractCegarLoop]: Abstraction has 190 states and 191 transitions. [2018-10-24 12:29:14,363 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:29:14,363 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 191 transitions. [2018-10-24 12:29:14,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-10-24 12:29:14,364 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:14,365 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:14,365 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:14,365 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:14,365 INFO L82 PathProgramCache]: Analyzing trace with hash 1686557268, now seen corresponding path program 29 times [2018-10-24 12:29:14,365 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:14,366 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:14,366 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:14,366 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:14,366 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:14,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:14,948 INFO L134 CoverageAnalysis]: Checked inductivity of 2555 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:29:14,949 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:14,949 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:14,949 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:14,949 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:14,949 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:14,949 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:14,957 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:14,957 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:29:16,804 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2018-10-24 12:29:16,804 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:16,812 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:17,075 INFO L134 CoverageAnalysis]: Checked inductivity of 2555 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1365 trivial. 0 not checked. [2018-10-24 12:29:17,075 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:18,386 INFO L134 CoverageAnalysis]: Checked inductivity of 2555 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1365 trivial. 0 not checked. [2018-10-24 12:29:18,408 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:18,409 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 67 [2018-10-24 12:29:18,409 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:18,410 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:29:18,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:29:18,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1963, Invalid=2459, Unknown=0, NotChecked=0, Total=4422 [2018-10-24 12:29:18,411 INFO L87 Difference]: Start difference. First operand 190 states and 191 transitions. Second operand 36 states. [2018-10-24 12:29:18,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:18,827 INFO L93 Difference]: Finished difference Result 301 states and 306 transitions. [2018-10-24 12:29:18,828 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:29:18,828 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 189 [2018-10-24 12:29:18,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:18,830 INFO L225 Difference]: With dead ends: 301 [2018-10-24 12:29:18,830 INFO L226 Difference]: Without dead ends: 204 [2018-10-24 12:29:18,831 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 345 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1969, Invalid=2587, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:29:18,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2018-10-24 12:29:18,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 202. [2018-10-24 12:29:18,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2018-10-24 12:29:18,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 203 transitions. [2018-10-24 12:29:18,836 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 203 transitions. Word has length 189 [2018-10-24 12:29:18,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:18,837 INFO L481 AbstractCegarLoop]: Abstraction has 202 states and 203 transitions. [2018-10-24 12:29:18,837 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:29:18,837 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 203 transitions. [2018-10-24 12:29:18,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2018-10-24 12:29:18,838 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:18,839 INFO L375 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:18,839 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:18,839 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:18,839 INFO L82 PathProgramCache]: Analyzing trace with hash 852191383, now seen corresponding path program 30 times [2018-10-24 12:29:18,839 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:18,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:18,840 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:18,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:18,840 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:18,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:19,603 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:29:19,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:19,604 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:19,604 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:19,604 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:19,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:19,604 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:19,611 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:19,612 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:19,759 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:19,759 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:19,765 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:19,880 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:29:19,881 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:21,036 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:29:21,069 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:21,069 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2018-10-24 12:29:21,069 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:21,070 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 12:29:21,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 12:29:21,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-24 12:29:21,072 INFO L87 Difference]: Start difference. First operand 202 states and 203 transitions. Second operand 35 states. [2018-10-24 12:29:21,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:21,491 INFO L93 Difference]: Finished difference Result 312 states and 315 transitions. [2018-10-24 12:29:21,491 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:29:21,491 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 201 [2018-10-24 12:29:21,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:21,494 INFO L225 Difference]: With dead ends: 312 [2018-10-24 12:29:21,494 INFO L226 Difference]: Without dead ends: 211 [2018-10-24 12:29:21,495 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 370 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-24 12:29:21,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2018-10-24 12:29:21,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 205. [2018-10-24 12:29:21,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-10-24 12:29:21,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 206 transitions. [2018-10-24 12:29:21,500 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 206 transitions. Word has length 201 [2018-10-24 12:29:21,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:21,500 INFO L481 AbstractCegarLoop]: Abstraction has 205 states and 206 transitions. [2018-10-24 12:29:21,500 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 12:29:21,500 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 206 transitions. [2018-10-24 12:29:21,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-10-24 12:29:21,501 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:21,502 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:21,502 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:21,502 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:21,502 INFO L82 PathProgramCache]: Analyzing trace with hash -535149646, now seen corresponding path program 31 times [2018-10-24 12:29:21,502 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:21,503 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:21,503 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:21,503 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:21,503 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:21,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:22,252 INFO L134 CoverageAnalysis]: Checked inductivity of 3009 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:29:22,252 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:22,253 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:22,253 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:22,253 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:22,253 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:22,253 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:22,260 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:22,260 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:22,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:22,409 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:22,503 INFO L134 CoverageAnalysis]: Checked inductivity of 3009 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:29:22,503 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:23,910 INFO L134 CoverageAnalysis]: Checked inductivity of 3009 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:29:23,931 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:23,932 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-10-24 12:29:23,932 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:23,932 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:29:23,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:29:23,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:29:23,933 INFO L87 Difference]: Start difference. First operand 205 states and 206 transitions. Second operand 36 states. [2018-10-24 12:29:24,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:24,326 INFO L93 Difference]: Finished difference Result 319 states and 323 transitions. [2018-10-24 12:29:24,326 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:29:24,326 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 204 [2018-10-24 12:29:24,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:24,328 INFO L225 Difference]: With dead ends: 319 [2018-10-24 12:29:24,328 INFO L226 Difference]: Without dead ends: 218 [2018-10-24 12:29:24,329 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 442 GetRequests, 375 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:29:24,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2018-10-24 12:29:24,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 208. [2018-10-24 12:29:24,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2018-10-24 12:29:24,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 209 transitions. [2018-10-24 12:29:24,333 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 209 transitions. Word has length 204 [2018-10-24 12:29:24,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:24,334 INFO L481 AbstractCegarLoop]: Abstraction has 208 states and 209 transitions. [2018-10-24 12:29:24,334 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:29:24,334 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 209 transitions. [2018-10-24 12:29:24,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2018-10-24 12:29:24,335 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:24,335 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:24,336 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:24,336 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:24,336 INFO L82 PathProgramCache]: Analyzing trace with hash -341455177, now seen corresponding path program 32 times [2018-10-24 12:29:24,336 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:24,337 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:24,337 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:24,337 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:24,337 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:24,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:25,284 INFO L134 CoverageAnalysis]: Checked inductivity of 3107 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:29:25,285 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:25,285 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:25,285 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:25,285 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:25,285 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:25,285 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:25,293 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:25,293 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:29:28,525 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-10-24 12:29:28,526 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:28,534 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:28,700 INFO L134 CoverageAnalysis]: Checked inductivity of 3107 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2018-10-24 12:29:28,700 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:29,982 INFO L134 CoverageAnalysis]: Checked inductivity of 3107 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2018-10-24 12:29:30,006 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:30,006 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 73 [2018-10-24 12:29:30,006 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:30,007 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:29:30,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:29:30,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2356, Invalid=2900, Unknown=0, NotChecked=0, Total=5256 [2018-10-24 12:29:30,008 INFO L87 Difference]: Start difference. First operand 208 states and 209 transitions. Second operand 39 states. [2018-10-24 12:29:30,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:30,963 INFO L93 Difference]: Finished difference Result 328 states and 333 transitions. [2018-10-24 12:29:30,963 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-24 12:29:30,963 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 207 [2018-10-24 12:29:30,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:30,965 INFO L225 Difference]: With dead ends: 328 [2018-10-24 12:29:30,965 INFO L226 Difference]: Without dead ends: 222 [2018-10-24 12:29:30,966 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 378 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 365 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2362, Invalid=3040, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:29:30,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-10-24 12:29:30,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 220. [2018-10-24 12:29:30,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2018-10-24 12:29:30,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 221 transitions. [2018-10-24 12:29:30,972 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 221 transitions. Word has length 207 [2018-10-24 12:29:30,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:30,972 INFO L481 AbstractCegarLoop]: Abstraction has 220 states and 221 transitions. [2018-10-24 12:29:30,972 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:29:30,973 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 221 transitions. [2018-10-24 12:29:30,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2018-10-24 12:29:30,973 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:30,973 INFO L375 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:30,974 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:30,974 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:30,974 INFO L82 PathProgramCache]: Analyzing trace with hash -1617730476, now seen corresponding path program 33 times [2018-10-24 12:29:30,974 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:30,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:30,975 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:30,975 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:30,975 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:31,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:32,161 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:29:32,161 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:32,161 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:32,161 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:32,162 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:32,162 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:32,162 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:32,170 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:32,170 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:32,331 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:32,332 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:32,336 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:32,383 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:29:32,383 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:34,047 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:29:34,070 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:34,070 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-10-24 12:29:34,070 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:34,071 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:29:34,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:29:34,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-24 12:29:34,072 INFO L87 Difference]: Start difference. First operand 220 states and 221 transitions. Second operand 38 states. [2018-10-24 12:29:34,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:34,445 INFO L93 Difference]: Finished difference Result 339 states and 342 transitions. [2018-10-24 12:29:34,446 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-24 12:29:34,446 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 219 [2018-10-24 12:29:34,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:34,447 INFO L225 Difference]: With dead ends: 339 [2018-10-24 12:29:34,448 INFO L226 Difference]: Without dead ends: 229 [2018-10-24 12:29:34,448 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 403 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-24 12:29:34,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2018-10-24 12:29:34,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 223. [2018-10-24 12:29:34,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2018-10-24 12:29:34,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 224 transitions. [2018-10-24 12:29:34,453 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 224 transitions. Word has length 219 [2018-10-24 12:29:34,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:34,454 INFO L481 AbstractCegarLoop]: Abstraction has 223 states and 224 transitions. [2018-10-24 12:29:34,454 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:29:34,454 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 224 transitions. [2018-10-24 12:29:34,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-10-24 12:29:34,455 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:34,456 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:34,456 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:34,456 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:34,456 INFO L82 PathProgramCache]: Analyzing trace with hash 1207553711, now seen corresponding path program 34 times [2018-10-24 12:29:34,456 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:34,457 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:34,457 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:34,457 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:34,458 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:34,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:35,134 INFO L134 CoverageAnalysis]: Checked inductivity of 3606 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:29:35,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:35,135 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:35,135 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:35,135 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:35,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:35,135 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:35,149 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:35,149 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:35,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:35,315 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:35,373 INFO L134 CoverageAnalysis]: Checked inductivity of 3606 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:29:35,374 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:36,918 INFO L134 CoverageAnalysis]: Checked inductivity of 3606 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:29:36,939 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:36,939 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 75 [2018-10-24 12:29:36,939 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:36,940 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:29:36,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:29:36,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-24 12:29:36,941 INFO L87 Difference]: Start difference. First operand 223 states and 224 transitions. Second operand 39 states. [2018-10-24 12:29:37,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:37,343 INFO L93 Difference]: Finished difference Result 346 states and 350 transitions. [2018-10-24 12:29:37,343 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-24 12:29:37,344 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 222 [2018-10-24 12:29:37,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:37,346 INFO L225 Difference]: With dead ends: 346 [2018-10-24 12:29:37,346 INFO L226 Difference]: Without dead ends: 236 [2018-10-24 12:29:37,347 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 408 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-24 12:29:37,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2018-10-24 12:29:37,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 226. [2018-10-24 12:29:37,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2018-10-24 12:29:37,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 227 transitions. [2018-10-24 12:29:37,352 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 227 transitions. Word has length 222 [2018-10-24 12:29:37,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:37,352 INFO L481 AbstractCegarLoop]: Abstraction has 226 states and 227 transitions. [2018-10-24 12:29:37,353 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:29:37,353 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 227 transitions. [2018-10-24 12:29:37,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2018-10-24 12:29:37,354 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:37,354 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:37,354 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:37,355 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:37,355 INFO L82 PathProgramCache]: Analyzing trace with hash 774668916, now seen corresponding path program 35 times [2018-10-24 12:29:37,355 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:37,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:37,356 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:37,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:37,356 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:37,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:38,562 INFO L134 CoverageAnalysis]: Checked inductivity of 3713 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:29:38,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:38,563 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:38,563 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:38,563 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:38,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:38,564 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:38,571 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:38,572 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:29:43,193 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2018-10-24 12:29:43,194 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:43,201 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:43,323 INFO L134 CoverageAnalysis]: Checked inductivity of 3713 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1962 trivial. 0 not checked. [2018-10-24 12:29:43,323 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:44,812 INFO L134 CoverageAnalysis]: Checked inductivity of 3713 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1962 trivial. 0 not checked. [2018-10-24 12:29:44,836 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:44,836 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 79 [2018-10-24 12:29:44,836 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:44,837 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:29:44,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:29:44,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2785, Invalid=3377, Unknown=0, NotChecked=0, Total=6162 [2018-10-24 12:29:44,838 INFO L87 Difference]: Start difference. First operand 226 states and 227 transitions. Second operand 42 states. [2018-10-24 12:29:45,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:45,211 INFO L93 Difference]: Finished difference Result 355 states and 360 transitions. [2018-10-24 12:29:45,212 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:29:45,212 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 225 [2018-10-24 12:29:45,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:45,214 INFO L225 Difference]: With dead ends: 355 [2018-10-24 12:29:45,214 INFO L226 Difference]: Without dead ends: 240 [2018-10-24 12:29:45,215 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 411 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 398 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2791, Invalid=3529, Unknown=0, NotChecked=0, Total=6320 [2018-10-24 12:29:45,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2018-10-24 12:29:45,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 238. [2018-10-24 12:29:45,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2018-10-24 12:29:45,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 239 transitions. [2018-10-24 12:29:45,220 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 239 transitions. Word has length 225 [2018-10-24 12:29:45,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:45,221 INFO L481 AbstractCegarLoop]: Abstraction has 238 states and 239 transitions. [2018-10-24 12:29:45,221 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:29:45,221 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 239 transitions. [2018-10-24 12:29:45,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2018-10-24 12:29:45,222 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:45,222 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:45,222 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:45,223 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:45,223 INFO L82 PathProgramCache]: Analyzing trace with hash -74539529, now seen corresponding path program 36 times [2018-10-24 12:29:45,223 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:45,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:45,224 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:45,224 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:45,224 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:45,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:46,016 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:29:46,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:46,017 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:46,017 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:46,017 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:46,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:46,017 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:46,025 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:46,026 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:46,191 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:46,191 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:46,196 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:46,257 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:29:46,257 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:48,447 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:29:48,468 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:48,468 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2018-10-24 12:29:48,468 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:48,469 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-24 12:29:48,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-24 12:29:48,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-24 12:29:48,469 INFO L87 Difference]: Start difference. First operand 238 states and 239 transitions. Second operand 41 states. [2018-10-24 12:29:48,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:48,833 INFO L93 Difference]: Finished difference Result 366 states and 369 transitions. [2018-10-24 12:29:48,834 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-24 12:29:48,834 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 237 [2018-10-24 12:29:48,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:48,836 INFO L225 Difference]: With dead ends: 366 [2018-10-24 12:29:48,836 INFO L226 Difference]: Without dead ends: 247 [2018-10-24 12:29:48,837 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 436 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-24 12:29:48,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-10-24 12:29:48,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 241. [2018-10-24 12:29:48,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2018-10-24 12:29:48,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 242 transitions. [2018-10-24 12:29:48,841 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 242 transitions. Word has length 237 [2018-10-24 12:29:48,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:48,841 INFO L481 AbstractCegarLoop]: Abstraction has 241 states and 242 transitions. [2018-10-24 12:29:48,841 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-24 12:29:48,841 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 242 transitions. [2018-10-24 12:29:48,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2018-10-24 12:29:48,842 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:48,842 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:48,842 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:48,843 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:48,843 INFO L82 PathProgramCache]: Analyzing trace with hash 1048528786, now seen corresponding path program 37 times [2018-10-24 12:29:48,843 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:48,843 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:48,843 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:48,843 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:48,844 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:48,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:49,622 INFO L134 CoverageAnalysis]: Checked inductivity of 4257 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:29:49,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:49,622 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:49,622 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:49,622 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:49,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:49,622 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:49,629 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:49,630 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:49,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:49,806 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:49,868 INFO L134 CoverageAnalysis]: Checked inductivity of 4257 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:29:49,868 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:52,043 INFO L134 CoverageAnalysis]: Checked inductivity of 4257 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:29:52,064 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:52,065 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-10-24 12:29:52,065 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:52,065 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:29:52,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:29:52,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3240, Invalid=3240, Unknown=0, NotChecked=0, Total=6480 [2018-10-24 12:29:52,066 INFO L87 Difference]: Start difference. First operand 241 states and 242 transitions. Second operand 42 states. [2018-10-24 12:29:52,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:52,474 INFO L93 Difference]: Finished difference Result 373 states and 377 transitions. [2018-10-24 12:29:52,474 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:29:52,474 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 240 [2018-10-24 12:29:52,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:52,476 INFO L225 Difference]: With dead ends: 373 [2018-10-24 12:29:52,476 INFO L226 Difference]: Without dead ends: 254 [2018-10-24 12:29:52,478 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 520 GetRequests, 441 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3240, Invalid=3240, Unknown=0, NotChecked=0, Total=6480 [2018-10-24 12:29:52,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2018-10-24 12:29:52,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 244. [2018-10-24 12:29:52,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2018-10-24 12:29:52,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 245 transitions. [2018-10-24 12:29:52,483 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 245 transitions. Word has length 240 [2018-10-24 12:29:52,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:52,484 INFO L481 AbstractCegarLoop]: Abstraction has 244 states and 245 transitions. [2018-10-24 12:29:52,484 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:29:52,484 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 245 transitions. [2018-10-24 12:29:52,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2018-10-24 12:29:52,485 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:52,485 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:52,486 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:52,486 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:52,486 INFO L82 PathProgramCache]: Analyzing trace with hash 581465111, now seen corresponding path program 38 times [2018-10-24 12:29:52,486 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:52,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:52,487 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:52,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:52,487 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:52,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:53,911 INFO L134 CoverageAnalysis]: Checked inductivity of 4373 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:29:53,911 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:53,911 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:53,912 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:53,912 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:53,912 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:53,912 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:53,920 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:53,920 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:30:00,488 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-10-24 12:30:00,489 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:30:00,498 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:00,650 INFO L134 CoverageAnalysis]: Checked inductivity of 4373 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2301 trivial. 0 not checked. [2018-10-24 12:30:00,651 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:02,344 INFO L134 CoverageAnalysis]: Checked inductivity of 4373 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2301 trivial. 0 not checked. [2018-10-24 12:30:02,369 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:02,369 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 85 [2018-10-24 12:30:02,370 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:02,370 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:30:02,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:30:02,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3250, Invalid=3890, Unknown=0, NotChecked=0, Total=7140 [2018-10-24 12:30:02,371 INFO L87 Difference]: Start difference. First operand 244 states and 245 transitions. Second operand 45 states. [2018-10-24 12:30:02,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:02,832 INFO L93 Difference]: Finished difference Result 382 states and 387 transitions. [2018-10-24 12:30:02,832 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-24 12:30:02,833 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 243 [2018-10-24 12:30:02,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:02,834 INFO L225 Difference]: With dead ends: 382 [2018-10-24 12:30:02,834 INFO L226 Difference]: Without dead ends: 258 [2018-10-24 12:30:02,836 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 444 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3256, Invalid=4054, Unknown=0, NotChecked=0, Total=7310 [2018-10-24 12:30:02,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2018-10-24 12:30:02,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 256. [2018-10-24 12:30:02,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2018-10-24 12:30:02,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 257 transitions. [2018-10-24 12:30:02,841 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 257 transitions. Word has length 243 [2018-10-24 12:30:02,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:02,842 INFO L481 AbstractCegarLoop]: Abstraction has 256 states and 257 transitions. [2018-10-24 12:30:02,842 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:30:02,842 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 257 transitions. [2018-10-24 12:30:02,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2018-10-24 12:30:02,843 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:02,843 INFO L375 BasicCegarLoop]: trace histogram [41, 41, 40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:02,844 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:02,844 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:02,844 INFO L82 PathProgramCache]: Analyzing trace with hash -1711526796, now seen corresponding path program 39 times [2018-10-24 12:30:02,844 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:02,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:02,845 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:30:02,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:02,845 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:02,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:03,959 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:30:03,959 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:03,959 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:03,959 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:03,960 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:03,960 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:03,960 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:03,967 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:30:03,967 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:30:04,152 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:30:04,152 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:30:04,158 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:04,232 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:30:04,232 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:06,118 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:30:06,141 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:06,141 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 85 [2018-10-24 12:30:06,141 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:06,142 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-24 12:30:06,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-24 12:30:06,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3570, Invalid=3570, Unknown=0, NotChecked=0, Total=7140 [2018-10-24 12:30:06,142 INFO L87 Difference]: Start difference. First operand 256 states and 257 transitions. Second operand 44 states. [2018-10-24 12:30:06,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:06,616 INFO L93 Difference]: Finished difference Result 393 states and 396 transitions. [2018-10-24 12:30:06,617 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:30:06,617 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 255 [2018-10-24 12:30:06,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:06,618 INFO L225 Difference]: With dead ends: 393 [2018-10-24 12:30:06,618 INFO L226 Difference]: Without dead ends: 265 [2018-10-24 12:30:06,619 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 552 GetRequests, 469 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3570, Invalid=3570, Unknown=0, NotChecked=0, Total=7140 [2018-10-24 12:30:06,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2018-10-24 12:30:06,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 259. [2018-10-24 12:30:06,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2018-10-24 12:30:06,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 260 transitions. [2018-10-24 12:30:06,625 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 260 transitions. Word has length 255 [2018-10-24 12:30:06,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:06,625 INFO L481 AbstractCegarLoop]: Abstraction has 259 states and 260 transitions. [2018-10-24 12:30:06,626 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-24 12:30:06,626 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 260 transitions. [2018-10-24 12:30:06,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-10-24 12:30:06,627 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:06,627 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:06,627 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:06,628 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:06,628 INFO L82 PathProgramCache]: Analyzing trace with hash 27116879, now seen corresponding path program 40 times [2018-10-24 12:30:06,628 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:06,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:06,629 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:30:06,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:06,629 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:06,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:07,562 INFO L134 CoverageAnalysis]: Checked inductivity of 4962 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:30:07,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:07,563 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:07,563 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:07,563 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:07,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:07,563 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:07,571 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:30:07,571 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:30:07,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:07,757 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:07,922 INFO L134 CoverageAnalysis]: Checked inductivity of 4962 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:30:07,922 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:10,339 INFO L134 CoverageAnalysis]: Checked inductivity of 4962 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:30:10,361 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:10,361 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2018-10-24 12:30:10,361 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:10,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:30:10,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:30:10,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3741, Invalid=3741, Unknown=0, NotChecked=0, Total=7482 [2018-10-24 12:30:10,363 INFO L87 Difference]: Start difference. First operand 259 states and 260 transitions. Second operand 45 states. [2018-10-24 12:30:10,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:10,836 INFO L93 Difference]: Finished difference Result 400 states and 404 transitions. [2018-10-24 12:30:10,836 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-24 12:30:10,836 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 258 [2018-10-24 12:30:10,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:10,837 INFO L225 Difference]: With dead ends: 400 [2018-10-24 12:30:10,838 INFO L226 Difference]: Without dead ends: 272 [2018-10-24 12:30:10,839 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 559 GetRequests, 474 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=3741, Invalid=3741, Unknown=0, NotChecked=0, Total=7482 [2018-10-24 12:30:10,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2018-10-24 12:30:10,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 262. [2018-10-24 12:30:10,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 262 states. [2018-10-24 12:30:10,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 263 transitions. [2018-10-24 12:30:10,843 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 263 transitions. Word has length 258 [2018-10-24 12:30:10,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:10,843 INFO L481 AbstractCegarLoop]: Abstraction has 262 states and 263 transitions. [2018-10-24 12:30:10,843 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:30:10,843 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 263 transitions. [2018-10-24 12:30:10,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2018-10-24 12:30:10,845 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:10,845 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:10,845 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:10,846 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:10,846 INFO L82 PathProgramCache]: Analyzing trace with hash -1344750956, now seen corresponding path program 41 times [2018-10-24 12:30:10,846 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:10,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:10,847 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:30:10,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:10,847 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:10,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:12,308 INFO L134 CoverageAnalysis]: Checked inductivity of 5087 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:30:12,308 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:12,309 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:12,309 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:12,309 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:12,309 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:12,309 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:12,317 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:30:12,317 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:30:21,790 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-10-24 12:30:21,791 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:30:21,802 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:21,919 INFO L134 CoverageAnalysis]: Checked inductivity of 5087 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2667 trivial. 0 not checked. [2018-10-24 12:30:21,919 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:24,117 INFO L134 CoverageAnalysis]: Checked inductivity of 5087 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2667 trivial. 0 not checked. [2018-10-24 12:30:24,144 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:24,144 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 91 [2018-10-24 12:30:24,144 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:24,145 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-24 12:30:24,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-24 12:30:24,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3751, Invalid=4439, Unknown=0, NotChecked=0, Total=8190 [2018-10-24 12:30:24,147 INFO L87 Difference]: Start difference. First operand 262 states and 263 transitions. Second operand 48 states. [2018-10-24 12:30:24,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:24,665 INFO L93 Difference]: Finished difference Result 409 states and 414 transitions. [2018-10-24 12:30:24,666 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:30:24,666 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 261 [2018-10-24 12:30:24,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:24,668 INFO L225 Difference]: With dead ends: 409 [2018-10-24 12:30:24,668 INFO L226 Difference]: Without dead ends: 276 [2018-10-24 12:30:24,669 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 567 GetRequests, 477 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=3757, Invalid=4615, Unknown=0, NotChecked=0, Total=8372 [2018-10-24 12:30:24,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2018-10-24 12:30:24,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 274. [2018-10-24 12:30:24,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2018-10-24 12:30:24,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 275 transitions. [2018-10-24 12:30:24,675 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 275 transitions. Word has length 261 [2018-10-24 12:30:24,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:24,675 INFO L481 AbstractCegarLoop]: Abstraction has 274 states and 275 transitions. [2018-10-24 12:30:24,675 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-24 12:30:24,675 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 275 transitions. [2018-10-24 12:30:24,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2018-10-24 12:30:24,677 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:24,677 INFO L375 BasicCegarLoop]: trace histogram [44, 44, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:24,677 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:24,678 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:24,678 INFO L82 PathProgramCache]: Analyzing trace with hash -1216246953, now seen corresponding path program 42 times [2018-10-24 12:30:24,678 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:24,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:24,679 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:30:24,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:24,679 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:24,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:25,644 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:30:25,644 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:25,644 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:25,644 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:25,644 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:25,645 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:25,645 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:25,678 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:30:25,678 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:30:25,883 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:30:25,884 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:30:25,890 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:25,949 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:30:25,949 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:28,011 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:30:28,033 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:28,033 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 91 [2018-10-24 12:30:28,033 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:28,034 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-24 12:30:28,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-24 12:30:28,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4095, Invalid=4095, Unknown=0, NotChecked=0, Total=8190 [2018-10-24 12:30:28,035 INFO L87 Difference]: Start difference. First operand 274 states and 275 transitions. Second operand 47 states. [2018-10-24 12:30:28,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:28,617 INFO L93 Difference]: Finished difference Result 420 states and 423 transitions. [2018-10-24 12:30:28,617 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-24 12:30:28,617 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 273 [2018-10-24 12:30:28,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:28,619 INFO L225 Difference]: With dead ends: 420 [2018-10-24 12:30:28,619 INFO L226 Difference]: Without dead ends: 283 [2018-10-24 12:30:28,620 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=4095, Invalid=4095, Unknown=0, NotChecked=0, Total=8190 [2018-10-24 12:30:28,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2018-10-24 12:30:28,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 277. [2018-10-24 12:30:28,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 277 states. [2018-10-24 12:30:28,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 278 transitions. [2018-10-24 12:30:28,626 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 278 transitions. Word has length 273 [2018-10-24 12:30:28,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:28,626 INFO L481 AbstractCegarLoop]: Abstraction has 277 states and 278 transitions. [2018-10-24 12:30:28,627 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-24 12:30:28,627 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 278 transitions. [2018-10-24 12:30:28,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2018-10-24 12:30:28,628 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:28,628 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:28,629 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:28,629 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:28,629 INFO L82 PathProgramCache]: Analyzing trace with hash -206650510, now seen corresponding path program 43 times [2018-10-24 12:30:28,629 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:28,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:28,630 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:30:28,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:28,630 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:28,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:29,848 INFO L134 CoverageAnalysis]: Checked inductivity of 5721 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:30:29,848 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:29,848 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:29,848 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:29,848 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:29,848 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:29,848 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:29,856 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:30:29,857 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:30:30,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:30,064 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:30,168 INFO L134 CoverageAnalysis]: Checked inductivity of 5721 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:30:30,169 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:32,371 INFO L134 CoverageAnalysis]: Checked inductivity of 5721 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:30:32,393 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:32,393 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-10-24 12:30:32,393 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:32,394 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-24 12:30:32,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-24 12:30:32,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4278, Invalid=4278, Unknown=0, NotChecked=0, Total=8556 [2018-10-24 12:30:32,395 INFO L87 Difference]: Start difference. First operand 277 states and 278 transitions. Second operand 48 states. [2018-10-24 12:30:32,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:32,984 INFO L93 Difference]: Finished difference Result 427 states and 431 transitions. [2018-10-24 12:30:32,984 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:30:32,985 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 276 [2018-10-24 12:30:32,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:32,987 INFO L225 Difference]: With dead ends: 427 [2018-10-24 12:30:32,987 INFO L226 Difference]: Without dead ends: 290 [2018-10-24 12:30:32,988 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 598 GetRequests, 507 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=4278, Invalid=4278, Unknown=0, NotChecked=0, Total=8556 [2018-10-24 12:30:32,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2018-10-24 12:30:32,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 280. [2018-10-24 12:30:32,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2018-10-24 12:30:32,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 281 transitions. [2018-10-24 12:30:32,994 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 281 transitions. Word has length 276 [2018-10-24 12:30:32,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:32,994 INFO L481 AbstractCegarLoop]: Abstraction has 280 states and 281 transitions. [2018-10-24 12:30:32,995 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-24 12:30:32,995 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 281 transitions. [2018-10-24 12:30:32,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 280 [2018-10-24 12:30:32,996 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:32,996 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:32,997 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:32,997 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:32,997 INFO L82 PathProgramCache]: Analyzing trace with hash -974990985, now seen corresponding path program 44 times [2018-10-24 12:30:32,997 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:32,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:32,998 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:30:32,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:32,998 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:33,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:33,965 INFO L134 CoverageAnalysis]: Checked inductivity of 5855 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:30:33,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:33,966 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:33,966 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:33,966 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:33,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:33,966 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:33,976 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:30:33,977 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:31:02,705 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 44 check-sat command(s) [2018-10-24 12:31:02,705 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:31:02,723 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:31:02,827 INFO L134 CoverageAnalysis]: Checked inductivity of 5855 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 3060 trivial. 0 not checked. [2018-10-24 12:31:02,827 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:31:05,197 INFO L134 CoverageAnalysis]: Checked inductivity of 5855 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 3060 trivial. 0 not checked. [2018-10-24 12:31:05,222 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:31:05,223 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 97 [2018-10-24 12:31:05,223 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:31:05,223 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-24 12:31:05,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-24 12:31:05,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4288, Invalid=5024, Unknown=0, NotChecked=0, Total=9312 [2018-10-24 12:31:05,224 INFO L87 Difference]: Start difference. First operand 280 states and 281 transitions. Second operand 51 states. [2018-10-24 12:31:05,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:31:05,795 INFO L93 Difference]: Finished difference Result 436 states and 441 transitions. [2018-10-24 12:31:05,795 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-24 12:31:05,795 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 279 [2018-10-24 12:31:05,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:31:05,796 INFO L225 Difference]: With dead ends: 436 [2018-10-24 12:31:05,797 INFO L226 Difference]: Without dead ends: 294 [2018-10-24 12:31:05,798 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 606 GetRequests, 510 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 497 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=4294, Invalid=5212, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:31:05,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2018-10-24 12:31:05,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 292. [2018-10-24 12:31:05,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2018-10-24 12:31:05,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 293 transitions. [2018-10-24 12:31:05,803 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 293 transitions. Word has length 279 [2018-10-24 12:31:05,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:31:05,803 INFO L481 AbstractCegarLoop]: Abstraction has 292 states and 293 transitions. [2018-10-24 12:31:05,803 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-24 12:31:05,803 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 293 transitions. [2018-10-24 12:31:05,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2018-10-24 12:31:05,805 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:31:05,805 INFO L375 BasicCegarLoop]: trace histogram [47, 47, 46, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:31:05,805 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:31:05,805 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:31:05,805 INFO L82 PathProgramCache]: Analyzing trace with hash -622232428, now seen corresponding path program 45 times [2018-10-24 12:31:05,805 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:31:05,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:05,806 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:31:05,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:05,806 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:31:05,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:31:07,021 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-24 12:31:07,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:07,021 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:31:07,021 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:31:07,021 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:31:07,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:07,022 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:31:07,029 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:31:07,029 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:31:07,243 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:31:07,243 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:31:07,250 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:31:07,317 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-24 12:31:07,317 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:31:09,739 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-24 12:31:09,762 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:31:09,762 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2018-10-24 12:31:09,762 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:31:09,763 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-24 12:31:09,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-24 12:31:09,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4656, Invalid=4656, Unknown=0, NotChecked=0, Total=9312 [2018-10-24 12:31:09,764 INFO L87 Difference]: Start difference. First operand 292 states and 293 transitions. Second operand 50 states. [2018-10-24 12:31:10,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:31:10,537 INFO L93 Difference]: Finished difference Result 447 states and 450 transitions. [2018-10-24 12:31:10,537 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-24 12:31:10,537 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 291 [2018-10-24 12:31:10,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:31:10,539 INFO L225 Difference]: With dead ends: 447 [2018-10-24 12:31:10,539 INFO L226 Difference]: Without dead ends: 301 [2018-10-24 12:31:10,540 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 630 GetRequests, 535 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4656, Invalid=4656, Unknown=0, NotChecked=0, Total=9312 [2018-10-24 12:31:10,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2018-10-24 12:31:10,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 295. [2018-10-24 12:31:10,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 295 states. [2018-10-24 12:31:10,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 296 transitions. [2018-10-24 12:31:10,546 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 296 transitions. Word has length 291 [2018-10-24 12:31:10,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:31:10,546 INFO L481 AbstractCegarLoop]: Abstraction has 295 states and 296 transitions. [2018-10-24 12:31:10,546 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-24 12:31:10,546 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 296 transitions. [2018-10-24 12:31:10,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2018-10-24 12:31:10,548 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:31:10,548 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:31:10,548 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:31:10,549 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:31:10,549 INFO L82 PathProgramCache]: Analyzing trace with hash 1009845231, now seen corresponding path program 46 times [2018-10-24 12:31:10,549 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:31:10,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:10,550 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:31:10,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:10,550 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:31:10,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:31:11,797 INFO L134 CoverageAnalysis]: Checked inductivity of 6534 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-24 12:31:11,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:11,797 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:31:11,798 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:31:11,798 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:31:11,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:11,798 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:31:11,806 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:31:11,806 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:31:12,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:31:12,025 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:31:12,114 INFO L134 CoverageAnalysis]: Checked inductivity of 6534 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-24 12:31:12,114 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:31:14,874 INFO L134 CoverageAnalysis]: Checked inductivity of 6534 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-24 12:31:14,897 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:31:14,897 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 99 [2018-10-24 12:31:14,897 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:31:14,898 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-24 12:31:14,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-24 12:31:14,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4851, Invalid=4851, Unknown=0, NotChecked=0, Total=9702 [2018-10-24 12:31:14,900 INFO L87 Difference]: Start difference. First operand 295 states and 296 transitions. Second operand 51 states. [2018-10-24 12:31:15,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:31:15,732 INFO L93 Difference]: Finished difference Result 454 states and 458 transitions. [2018-10-24 12:31:15,736 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-24 12:31:15,736 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 294 [2018-10-24 12:31:15,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:31:15,737 INFO L225 Difference]: With dead ends: 454 [2018-10-24 12:31:15,737 INFO L226 Difference]: Without dead ends: 308 [2018-10-24 12:31:15,738 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 637 GetRequests, 540 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=4851, Invalid=4851, Unknown=0, NotChecked=0, Total=9702 [2018-10-24 12:31:15,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2018-10-24 12:31:15,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 298. [2018-10-24 12:31:15,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 298 states. [2018-10-24 12:31:15,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 299 transitions. [2018-10-24 12:31:15,744 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 299 transitions. Word has length 294 [2018-10-24 12:31:15,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:31:15,745 INFO L481 AbstractCegarLoop]: Abstraction has 298 states and 299 transitions. [2018-10-24 12:31:15,745 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-24 12:31:15,745 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 299 transitions. [2018-10-24 12:31:15,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2018-10-24 12:31:15,746 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:31:15,747 INFO L375 BasicCegarLoop]: trace histogram [49, 48, 48, 47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:31:15,747 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:31:15,747 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:31:15,747 INFO L82 PathProgramCache]: Analyzing trace with hash -1089373516, now seen corresponding path program 47 times [2018-10-24 12:31:15,747 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:31:15,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:15,748 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:31:15,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:15,748 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:31:15,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:31:17,513 INFO L134 CoverageAnalysis]: Checked inductivity of 6677 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-24 12:31:17,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:17,513 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:31:17,513 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:31:17,514 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:31:17,514 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:17,514 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:31:17,523 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:31:17,524 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:31:34,629 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2018-10-24 12:31:34,630 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:31:34,649 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:31:34,765 INFO L134 CoverageAnalysis]: Checked inductivity of 6677 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3480 trivial. 0 not checked. [2018-10-24 12:31:34,765 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:31:37,357 INFO L134 CoverageAnalysis]: Checked inductivity of 6677 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3480 trivial. 0 not checked. [2018-10-24 12:31:37,385 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:31:37,386 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 103 [2018-10-24 12:31:37,386 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:31:37,386 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-24 12:31:37,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-24 12:31:37,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4861, Invalid=5645, Unknown=0, NotChecked=0, Total=10506 [2018-10-24 12:31:37,388 INFO L87 Difference]: Start difference. First operand 298 states and 299 transitions. Second operand 54 states. [2018-10-24 12:31:37,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:31:37,964 INFO L93 Difference]: Finished difference Result 463 states and 468 transitions. [2018-10-24 12:31:37,965 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-24 12:31:37,965 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 297 [2018-10-24 12:31:37,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:31:37,968 INFO L225 Difference]: With dead ends: 463 [2018-10-24 12:31:37,968 INFO L226 Difference]: Without dead ends: 312 [2018-10-24 12:31:37,969 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 645 GetRequests, 543 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=4867, Invalid=5845, Unknown=0, NotChecked=0, Total=10712 [2018-10-24 12:31:37,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2018-10-24 12:31:37,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 310. [2018-10-24 12:31:37,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 310 states. [2018-10-24 12:31:37,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 311 transitions. [2018-10-24 12:31:37,974 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 311 transitions. Word has length 297 [2018-10-24 12:31:37,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:31:37,974 INFO L481 AbstractCegarLoop]: Abstraction has 310 states and 311 transitions. [2018-10-24 12:31:37,975 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-24 12:31:37,975 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 311 transitions. [2018-10-24 12:31:37,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2018-10-24 12:31:37,976 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:31:37,977 INFO L375 BasicCegarLoop]: trace histogram [50, 50, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:31:37,977 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:31:37,977 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:31:37,977 INFO L82 PathProgramCache]: Analyzing trace with hash 842936503, now seen corresponding path program 48 times [2018-10-24 12:31:37,977 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:31:37,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:37,978 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:31:37,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:37,978 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:31:38,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:31:39,085 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-24 12:31:39,086 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:39,086 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:31:39,086 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:31:39,086 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:31:39,086 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:39,086 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:31:39,095 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:31:39,096 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:31:39,324 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:31:39,324 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:31:39,332 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:31:39,395 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-24 12:31:39,395 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:31:42,172 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-24 12:31:42,194 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:31:42,194 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 103 [2018-10-24 12:31:42,194 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:31:42,195 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-24 12:31:42,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-24 12:31:42,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5253, Invalid=5253, Unknown=0, NotChecked=0, Total=10506 [2018-10-24 12:31:42,196 INFO L87 Difference]: Start difference. First operand 310 states and 311 transitions. Second operand 53 states. [2018-10-24 12:31:42,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:31:42,867 INFO L93 Difference]: Finished difference Result 474 states and 477 transitions. [2018-10-24 12:31:42,868 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-24 12:31:42,868 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 309 [2018-10-24 12:31:42,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:31:42,869 INFO L225 Difference]: With dead ends: 474 [2018-10-24 12:31:42,869 INFO L226 Difference]: Without dead ends: 319 [2018-10-24 12:31:42,870 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 669 GetRequests, 568 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=5253, Invalid=5253, Unknown=0, NotChecked=0, Total=10506 [2018-10-24 12:31:42,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2018-10-24 12:31:42,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 313. [2018-10-24 12:31:42,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 313 states. [2018-10-24 12:31:42,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 314 transitions. [2018-10-24 12:31:42,874 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 314 transitions. Word has length 309 [2018-10-24 12:31:42,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:31:42,875 INFO L481 AbstractCegarLoop]: Abstraction has 313 states and 314 transitions. [2018-10-24 12:31:42,875 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-24 12:31:42,875 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 314 transitions. [2018-10-24 12:31:42,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 313 [2018-10-24 12:31:42,876 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:31:42,877 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 50, 50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:31:42,877 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:31:42,877 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:31:42,877 INFO L82 PathProgramCache]: Analyzing trace with hash 1692579666, now seen corresponding path program 49 times [2018-10-24 12:31:42,877 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:31:42,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:42,878 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:31:42,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:42,878 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:31:42,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:31:44,009 INFO L134 CoverageAnalysis]: Checked inductivity of 7401 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-24 12:31:44,009 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:44,009 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:31:44,009 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:31:44,010 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:31:44,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:44,010 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:31:44,018 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:31:44,018 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:31:44,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:31:44,250 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:31:44,315 INFO L134 CoverageAnalysis]: Checked inductivity of 7401 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-24 12:31:44,315 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:31:47,228 INFO L134 CoverageAnalysis]: Checked inductivity of 7401 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-24 12:31:47,249 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:31:47,250 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 105 [2018-10-24 12:31:47,250 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:31:47,250 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-24 12:31:47,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-24 12:31:47,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5460, Invalid=5460, Unknown=0, NotChecked=0, Total=10920 [2018-10-24 12:31:47,251 INFO L87 Difference]: Start difference. First operand 313 states and 314 transitions. Second operand 54 states. [2018-10-24 12:31:47,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:31:47,984 INFO L93 Difference]: Finished difference Result 481 states and 485 transitions. [2018-10-24 12:31:47,985 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-24 12:31:47,985 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 312 [2018-10-24 12:31:47,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:31:47,986 INFO L225 Difference]: With dead ends: 481 [2018-10-24 12:31:47,987 INFO L226 Difference]: Without dead ends: 326 [2018-10-24 12:31:47,987 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 676 GetRequests, 573 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=5460, Invalid=5460, Unknown=0, NotChecked=0, Total=10920 [2018-10-24 12:31:47,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2018-10-24 12:31:47,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 316. [2018-10-24 12:31:47,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2018-10-24 12:31:47,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 317 transitions. [2018-10-24 12:31:47,993 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 317 transitions. Word has length 312 [2018-10-24 12:31:47,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:31:47,993 INFO L481 AbstractCegarLoop]: Abstraction has 316 states and 317 transitions. [2018-10-24 12:31:47,993 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-24 12:31:47,993 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 317 transitions. [2018-10-24 12:31:47,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 316 [2018-10-24 12:31:47,995 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:31:47,995 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 51, 50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:31:47,995 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:31:47,996 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:31:47,996 INFO L82 PathProgramCache]: Analyzing trace with hash -1125194025, now seen corresponding path program 50 times [2018-10-24 12:31:47,996 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:31:47,996 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:47,997 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:31:47,997 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:47,997 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:31:48,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:31:49,251 INFO L134 CoverageAnalysis]: Checked inductivity of 7553 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-24 12:31:49,251 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:49,251 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:31:49,252 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:31:49,252 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:31:49,252 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:49,252 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:31:49,259 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:31:49,259 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:32:09,590 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2018-10-24 12:32:09,590 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:32:09,606 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:32:09,760 INFO L134 CoverageAnalysis]: Checked inductivity of 7553 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3927 trivial. 0 not checked. [2018-10-24 12:32:09,760 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:32:12,816 INFO L134 CoverageAnalysis]: Checked inductivity of 7553 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3927 trivial. 0 not checked. [2018-10-24 12:32:12,845 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:32:12,845 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 109 [2018-10-24 12:32:12,845 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:32:12,845 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-24 12:32:12,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-24 12:32:12,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5470, Invalid=6302, Unknown=0, NotChecked=0, Total=11772 [2018-10-24 12:32:12,847 INFO L87 Difference]: Start difference. First operand 316 states and 317 transitions. Second operand 57 states. [2018-10-24 12:32:13,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:32:13,443 INFO L93 Difference]: Finished difference Result 490 states and 495 transitions. [2018-10-24 12:32:13,443 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-24 12:32:13,443 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 315 [2018-10-24 12:32:13,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:32:13,445 INFO L225 Difference]: With dead ends: 490 [2018-10-24 12:32:13,445 INFO L226 Difference]: Without dead ends: 330 [2018-10-24 12:32:13,446 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 684 GetRequests, 576 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 563 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=5476, Invalid=6514, Unknown=0, NotChecked=0, Total=11990 [2018-10-24 12:32:13,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2018-10-24 12:32:13,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 328. [2018-10-24 12:32:13,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 328 states. [2018-10-24 12:32:13,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 329 transitions. [2018-10-24 12:32:13,452 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 329 transitions. Word has length 315 [2018-10-24 12:32:13,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:32:13,452 INFO L481 AbstractCegarLoop]: Abstraction has 328 states and 329 transitions. [2018-10-24 12:32:13,452 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-24 12:32:13,452 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 329 transitions. [2018-10-24 12:32:13,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2018-10-24 12:32:13,454 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:32:13,454 INFO L375 BasicCegarLoop]: trace histogram [53, 53, 52, 52, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:32:13,454 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:32:13,454 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:32:13,455 INFO L82 PathProgramCache]: Analyzing trace with hash 1516328116, now seen corresponding path program 51 times [2018-10-24 12:32:13,455 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:32:13,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:13,455 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:32:13,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:13,456 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:32:13,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:14,694 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-24 12:32:14,694 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:14,695 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:32:14,695 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:32:14,695 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:32:14,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:14,695 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:32:14,702 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:32:14,702 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:32:14,939 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:32:14,939 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:32:14,946 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:32:15,023 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-24 12:32:15,023 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:32:18,365 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-24 12:32:18,386 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:32:18,386 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 109 [2018-10-24 12:32:18,386 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:32:18,387 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-10-24 12:32:18,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-10-24 12:32:18,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5886, Invalid=5886, Unknown=0, NotChecked=0, Total=11772 [2018-10-24 12:32:18,388 INFO L87 Difference]: Start difference. First operand 328 states and 329 transitions. Second operand 56 states. [2018-10-24 12:32:19,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:32:19,131 INFO L93 Difference]: Finished difference Result 501 states and 504 transitions. [2018-10-24 12:32:19,131 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-24 12:32:19,131 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 327 [2018-10-24 12:32:19,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:32:19,132 INFO L225 Difference]: With dead ends: 501 [2018-10-24 12:32:19,132 INFO L226 Difference]: Without dead ends: 337 [2018-10-24 12:32:19,134 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 708 GetRequests, 601 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=5886, Invalid=5886, Unknown=0, NotChecked=0, Total=11772 [2018-10-24 12:32:19,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2018-10-24 12:32:19,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 331. [2018-10-24 12:32:19,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 331 states. [2018-10-24 12:32:19,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 332 transitions. [2018-10-24 12:32:19,139 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 332 transitions. Word has length 327 [2018-10-24 12:32:19,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:32:19,139 INFO L481 AbstractCegarLoop]: Abstraction has 331 states and 332 transitions. [2018-10-24 12:32:19,139 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-10-24 12:32:19,140 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 332 transitions. [2018-10-24 12:32:19,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2018-10-24 12:32:19,141 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:32:19,142 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 53, 53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:32:19,142 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:32:19,142 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:32:19,142 INFO L82 PathProgramCache]: Analyzing trace with hash 1633258127, now seen corresponding path program 52 times [2018-10-24 12:32:19,142 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:32:19,143 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:19,143 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:32:19,143 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:19,143 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:32:19,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:20,365 INFO L134 CoverageAnalysis]: Checked inductivity of 8322 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-24 12:32:20,365 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:20,365 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:32:20,366 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:32:20,366 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:32:20,366 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:20,366 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:32:20,374 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:32:20,374 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:32:20,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:20,616 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:32:20,728 INFO L134 CoverageAnalysis]: Checked inductivity of 8322 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-24 12:32:20,728 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:32:23,914 INFO L134 CoverageAnalysis]: Checked inductivity of 8322 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-24 12:32:23,936 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:32:23,936 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 111 [2018-10-24 12:32:23,936 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:32:23,937 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-24 12:32:23,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-24 12:32:23,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6105, Invalid=6105, Unknown=0, NotChecked=0, Total=12210 [2018-10-24 12:32:23,938 INFO L87 Difference]: Start difference. First operand 331 states and 332 transitions. Second operand 57 states. [2018-10-24 12:32:24,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:32:24,806 INFO L93 Difference]: Finished difference Result 508 states and 512 transitions. [2018-10-24 12:32:24,807 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-24 12:32:24,807 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 330 [2018-10-24 12:32:24,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:32:24,808 INFO L225 Difference]: With dead ends: 508 [2018-10-24 12:32:24,808 INFO L226 Difference]: Without dead ends: 344 [2018-10-24 12:32:24,809 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 715 GetRequests, 606 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=6105, Invalid=6105, Unknown=0, NotChecked=0, Total=12210 [2018-10-24 12:32:24,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2018-10-24 12:32:24,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 334. [2018-10-24 12:32:24,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 334 states. [2018-10-24 12:32:24,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 335 transitions. [2018-10-24 12:32:24,813 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 335 transitions. Word has length 330 [2018-10-24 12:32:24,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:32:24,814 INFO L481 AbstractCegarLoop]: Abstraction has 334 states and 335 transitions. [2018-10-24 12:32:24,814 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-24 12:32:24,814 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 335 transitions. [2018-10-24 12:32:24,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2018-10-24 12:32:24,815 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:32:24,816 INFO L375 BasicCegarLoop]: trace histogram [55, 54, 54, 53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:32:24,816 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:32:24,816 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:32:24,816 INFO L82 PathProgramCache]: Analyzing trace with hash 1876738772, now seen corresponding path program 53 times [2018-10-24 12:32:24,816 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:32:24,817 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:24,817 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:32:24,817 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:24,817 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:32:24,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:26,116 INFO L134 CoverageAnalysis]: Checked inductivity of 8483 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-24 12:32:26,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:26,116 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:32:26,117 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:32:26,117 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:32:26,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:26,117 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:32:26,124 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:32:26,125 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown