java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/gj2007_true-unreach-call_true-termination.c.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-b6335f6 [2018-10-23 10:05:26,265 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-23 10:05:26,267 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-23 10:05:26,279 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-23 10:05:26,280 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-23 10:05:26,281 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-23 10:05:26,282 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-23 10:05:26,284 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-23 10:05:26,286 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-23 10:05:26,286 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-23 10:05:26,287 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-23 10:05:26,288 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-23 10:05:26,289 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-23 10:05:26,290 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-23 10:05:26,291 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-23 10:05:26,292 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-23 10:05:26,292 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-23 10:05:26,294 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-23 10:05:26,296 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-23 10:05:26,302 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-23 10:05:26,303 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-23 10:05:26,306 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-23 10:05:26,311 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-23 10:05:26,326 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-23 10:05:26,356 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-23 10:05:26,356 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-23 10:05:26,357 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-23 10:05:26,357 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-23 10:05:26,358 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-23 10:05:26,358 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-23 10:05:26,358 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-23 10:05:26,358 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-23 10:05:26,358 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-23 10:05:26,359 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-23 10:05:26,359 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-23 10:05:26,359 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-23 10:05:26,360 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-23 10:05:26,360 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-23 10:05:26,360 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-23 10:05:26,360 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-23 10:05:26,361 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-23 10:05:26,361 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-23 10:05:26,361 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-23 10:05:26,361 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-23 10:05:26,361 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-23 10:05:26,362 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-23 10:05:26,362 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-23 10:05:26,362 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-23 10:05:26,362 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-23 10:05:26,362 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-23 10:05:26,363 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-23 10:05:26,363 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-23 10:05:26,363 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-23 10:05:26,363 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-23 10:05:26,364 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-23 10:05:26,364 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-23 10:05:26,364 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-23 10:05:26,364 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-23 10:05:26,410 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-23 10:05:26,422 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-23 10:05:26,426 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-23 10:05:26,428 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-23 10:05:26,428 INFO L276 PluginConnector]: CDTParser initialized [2018-10-23 10:05:26,429 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-lit/gj2007_true-unreach-call_true-termination.c.i [2018-10-23 10:05:26,494 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/133534064/aa8f1ea52a9346a086fc5beefe21f319/FLAG1684e8ed6 [2018-10-23 10:05:26,927 INFO L298 CDTParser]: Found 1 translation units. [2018-10-23 10:05:26,928 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/gj2007_true-unreach-call_true-termination.c.i [2018-10-23 10:05:26,935 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/133534064/aa8f1ea52a9346a086fc5beefe21f319/FLAG1684e8ed6 [2018-10-23 10:05:26,957 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/133534064/aa8f1ea52a9346a086fc5beefe21f319 [2018-10-23 10:05:26,969 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-23 10:05:26,972 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-23 10:05:26,972 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-23 10:05:26,973 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-23 10:05:26,976 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-23 10:05:26,978 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 10:05:26" (1/1) ... [2018-10-23 10:05:26,981 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@a9330e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:26, skipping insertion in model container [2018-10-23 10:05:26,981 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 10:05:26" (1/1) ... [2018-10-23 10:05:26,992 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-23 10:05:27,011 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-23 10:05:27,189 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-23 10:05:27,194 INFO L189 MainTranslator]: Completed pre-run [2018-10-23 10:05:27,212 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-23 10:05:27,229 INFO L193 MainTranslator]: Completed translation [2018-10-23 10:05:27,230 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:27 WrapperNode [2018-10-23 10:05:27,230 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-23 10:05:27,231 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-23 10:05:27,231 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-23 10:05:27,231 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-23 10:05:27,241 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:27" (1/1) ... [2018-10-23 10:05:27,246 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:27" (1/1) ... [2018-10-23 10:05:27,253 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-23 10:05:27,253 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-23 10:05:27,253 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-23 10:05:27,253 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-23 10:05:27,264 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:27" (1/1) ... [2018-10-23 10:05:27,264 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:27" (1/1) ... [2018-10-23 10:05:27,265 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:27" (1/1) ... [2018-10-23 10:05:27,265 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:27" (1/1) ... [2018-10-23 10:05:27,272 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:27" (1/1) ... [2018-10-23 10:05:27,279 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:27" (1/1) ... [2018-10-23 10:05:27,280 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:27" (1/1) ... [2018-10-23 10:05:27,281 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-23 10:05:27,282 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-23 10:05:27,282 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-23 10:05:27,282 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-23 10:05:27,284 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:27" (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 [2018-10-23 10:05:27,351 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-23 10:05:27,352 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-23 10:05:27,352 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-23 10:05:27,352 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-23 10:05:27,352 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-23 10:05:27,353 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-23 10:05:27,353 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-23 10:05:27,353 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-23 10:05:27,606 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-23 10:05:27,607 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 10:05:27 BoogieIcfgContainer [2018-10-23 10:05:27,607 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-23 10:05:27,608 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-23 10:05:27,608 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-23 10:05:27,612 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-23 10:05:27,612 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 10:05:26" (1/3) ... [2018-10-23 10:05:27,613 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c1511a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 10:05:27, skipping insertion in model container [2018-10-23 10:05:27,613 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:05:27" (2/3) ... [2018-10-23 10:05:27,613 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c1511a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 10:05:27, skipping insertion in model container [2018-10-23 10:05:27,614 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 10:05:27" (3/3) ... [2018-10-23 10:05:27,615 INFO L112 eAbstractionObserver]: Analyzing ICFG gj2007_true-unreach-call_true-termination.c.i [2018-10-23 10:05:27,626 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-23 10:05:27,634 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-23 10:05:27,651 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-23 10:05:27,682 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-23 10:05:27,683 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-23 10:05:27,683 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-23 10:05:27,683 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-23 10:05:27,683 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-23 10:05:27,683 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-23 10:05:27,683 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-23 10:05:27,684 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-23 10:05:27,702 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-10-23 10:05:27,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-23 10:05:27,709 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:27,710 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:27,712 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:27,719 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:27,719 INFO L82 PathProgramCache]: Analyzing trace with hash -147882559, now seen corresponding path program 1 times [2018-10-23 10:05:27,722 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:27,774 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:27,774 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:27,774 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:27,774 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:27,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:27,831 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:05:27,833 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 10:05:27,833 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-23 10:05:27,833 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-23 10:05:27,838 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-23 10:05:27,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-23 10:05:27,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-23 10:05:27,858 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2018-10-23 10:05:27,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:27,881 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2018-10-23 10:05:27,881 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-23 10:05:27,883 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-23 10:05:27,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:27,892 INFO L225 Difference]: With dead ends: 32 [2018-10-23 10:05:27,892 INFO L226 Difference]: Without dead ends: 13 [2018-10-23 10:05:27,896 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 [2018-10-23 10:05:27,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-23 10:05:27,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-23 10:05:27,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-23 10:05:27,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-10-23 10:05:27,932 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-10-23 10:05:27,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:27,933 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-10-23 10:05:27,933 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-23 10:05:27,933 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-10-23 10:05:27,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-23 10:05:27,934 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:27,934 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:27,935 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:27,935 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:27,935 INFO L82 PathProgramCache]: Analyzing trace with hash -717461825, now seen corresponding path program 1 times [2018-10-23 10:05:27,936 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:27,937 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:27,937 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:27,937 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:27,937 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:27,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:28,045 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:05:28,046 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 10:05:28,046 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-23 10:05:28,047 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-23 10:05:28,049 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-23 10:05:28,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-23 10:05:28,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-23 10:05:28,051 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-10-23 10:05:28,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:28,160 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2018-10-23 10:05:28,161 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-23 10:05:28,161 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-23 10:05:28,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:28,162 INFO L225 Difference]: With dead ends: 24 [2018-10-23 10:05:28,162 INFO L226 Difference]: Without dead ends: 16 [2018-10-23 10:05:28,163 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 [2018-10-23 10:05:28,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-23 10:05:28,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-23 10:05:28,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-23 10:05:28,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2018-10-23 10:05:28,168 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2018-10-23 10:05:28,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:28,169 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2018-10-23 10:05:28,169 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-23 10:05:28,169 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2018-10-23 10:05:28,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-23 10:05:28,170 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:28,170 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:28,170 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:28,171 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:28,171 INFO L82 PathProgramCache]: Analyzing trace with hash 64649018, now seen corresponding path program 1 times [2018-10-23 10:05:28,171 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:28,172 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:28,172 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:28,172 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:28,172 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:28,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:28,261 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:05:28,262 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:28,262 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:28,264 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-23 10:05:28,265 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [27], [30], [32], [38], [39], [40], [42] [2018-10-23 10:05:28,310 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-23 10:05:28,310 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-23 10:05:28,509 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-10-23 10:05:28,511 INFO L272 AbstractInterpreter]: Visited 9 different actions 41 times. Merged at 3 different actions 24 times. Widened at 1 different actions 4 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-10-23 10:05:28,527 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:28,527 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-10-23 10:05:28,582 INFO L224 lantSequenceWeakener]: Could never weaken! [2018-10-23 10:05:28,583 INFO L411 sIntCurrentIteration]: Unifying AI predicates [2018-10-23 10:05:28,603 INFO L422 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-10-23 10:05:28,604 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-10-23 10:05:28,604 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2018-10-23 10:05:28,604 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-23 10:05:28,605 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-23 10:05:28,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-23 10:05:28,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-23 10:05:28,607 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 3 states. [2018-10-23 10:05:28,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:28,697 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2018-10-23 10:05:28,698 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-23 10:05:28,698 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2018-10-23 10:05:28,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:28,699 INFO L225 Difference]: With dead ends: 24 [2018-10-23 10:05:28,699 INFO L226 Difference]: Without dead ends: 19 [2018-10-23 10:05:28,699 INFO L605 BasicCegarLoop]: 2 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-23 10:05:28,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-23 10:05:28,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-23 10:05:28,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-23 10:05:28,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2018-10-23 10:05:28,705 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2018-10-23 10:05:28,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:28,706 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2018-10-23 10:05:28,706 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-23 10:05:28,706 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2018-10-23 10:05:28,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-23 10:05:28,707 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:28,708 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:28,708 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:28,709 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:28,709 INFO L82 PathProgramCache]: Analyzing trace with hash 1506199393, now seen corresponding path program 1 times [2018-10-23 10:05:28,709 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:28,710 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:28,710 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:28,710 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:28,710 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:28,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:28,787 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:05:28,788 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:28,788 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:28,788 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 18 with the following transitions: [2018-10-23 10:05:28,789 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [27], [30], [32], [38], [39], [40], [42] [2018-10-23 10:05:28,790 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-23 10:05:28,790 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-23 10:05:28,889 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-23 10:05:28,889 INFO L272 AbstractInterpreter]: Visited 14 different actions 67 times. Merged at 5 different actions 31 times. Widened at 2 different actions 6 times. Found 4 fixpoints after 2 different actions. Largest state had 2 variables. [2018-10-23 10:05:28,914 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:28,915 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-23 10:05:28,915 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:28,915 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 [2018-10-23 10:05:28,926 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:28,927 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:05:28,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:28,956 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:28,977 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:05:28,978 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:29,074 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:05:29,096 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:29,097 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-23 10:05:29,097 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:29,097 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-23 10:05:29,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-23 10:05:29,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-23 10:05:29,098 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 4 states. [2018-10-23 10:05:29,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:29,173 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-23 10:05:29,174 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-23 10:05:29,174 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2018-10-23 10:05:29,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:29,175 INFO L225 Difference]: With dead ends: 30 [2018-10-23 10:05:29,175 INFO L226 Difference]: Without dead ends: 22 [2018-10-23 10:05:29,177 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-23 10:05:29,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-23 10:05:29,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-23 10:05:29,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-23 10:05:29,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2018-10-23 10:05:29,183 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2018-10-23 10:05:29,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:29,183 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2018-10-23 10:05:29,184 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-23 10:05:29,184 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2018-10-23 10:05:29,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-23 10:05:29,185 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:29,185 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:29,185 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:29,185 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:29,186 INFO L82 PathProgramCache]: Analyzing trace with hash 1748455324, now seen corresponding path program 2 times [2018-10-23 10:05:29,186 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:29,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:29,187 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:29,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:29,187 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:29,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:29,311 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:05:29,311 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:29,312 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:29,312 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:29,312 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:29,312 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:29,313 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 [2018-10-23 10:05:29,327 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:05:29,327 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:05:29,360 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:05:29,360 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:05:29,362 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:29,368 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:05:29,369 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:29,649 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:05:29,671 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:29,671 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-23 10:05:29,671 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:29,672 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-23 10:05:29,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-23 10:05:29,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-23 10:05:29,673 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 5 states. [2018-10-23 10:05:29,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:29,731 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2018-10-23 10:05:29,733 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-23 10:05:29,734 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2018-10-23 10:05:29,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:29,735 INFO L225 Difference]: With dead ends: 33 [2018-10-23 10:05:29,735 INFO L226 Difference]: Without dead ends: 25 [2018-10-23 10:05:29,736 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-23 10:05:29,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-23 10:05:29,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-23 10:05:29,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-23 10:05:29,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2018-10-23 10:05:29,742 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 20 [2018-10-23 10:05:29,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:29,742 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2018-10-23 10:05:29,743 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-23 10:05:29,743 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2018-10-23 10:05:29,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-23 10:05:29,744 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:29,744 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:29,745 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:29,745 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:29,745 INFO L82 PathProgramCache]: Analyzing trace with hash -1045128831, now seen corresponding path program 3 times [2018-10-23 10:05:29,745 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:29,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:29,747 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:05:29,747 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:29,747 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:29,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:29,871 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:05:29,871 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:29,871 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:29,872 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:29,872 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:29,872 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:29,872 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 [2018-10-23 10:05:29,881 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:05:29,881 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:05:29,895 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:05:29,895 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:05:29,898 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:30,081 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:05:30,084 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:30,194 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:05:30,216 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:30,216 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 14 [2018-10-23 10:05:30,217 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:30,217 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-23 10:05:30,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-23 10:05:30,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-23 10:05:30,218 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 10 states. [2018-10-23 10:05:30,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:30,397 INFO L93 Difference]: Finished difference Result 48 states and 60 transitions. [2018-10-23 10:05:30,400 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-23 10:05:30,400 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 23 [2018-10-23 10:05:30,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:30,404 INFO L225 Difference]: With dead ends: 48 [2018-10-23 10:05:30,405 INFO L226 Difference]: Without dead ends: 40 [2018-10-23 10:05:30,405 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-23 10:05:30,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-23 10:05:30,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 36. [2018-10-23 10:05:30,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-23 10:05:30,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2018-10-23 10:05:30,417 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 23 [2018-10-23 10:05:30,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:30,419 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2018-10-23 10:05:30,419 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-23 10:05:30,419 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2018-10-23 10:05:30,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-23 10:05:30,421 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:30,421 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:30,421 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:30,422 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:30,422 INFO L82 PathProgramCache]: Analyzing trace with hash -31153985, now seen corresponding path program 4 times [2018-10-23 10:05:30,422 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:30,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:30,424 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:05:30,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:30,424 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:30,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:30,700 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 55 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:30,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:30,701 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:30,701 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:30,701 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:30,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:30,701 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 [2018-10-23 10:05:30,709 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:30,709 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:05:30,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:30,736 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:30,745 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 55 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:30,745 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:30,873 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 55 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:30,895 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:30,895 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-23 10:05:30,896 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:30,896 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-23 10:05:30,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-23 10:05:30,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-23 10:05:30,897 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand 7 states. [2018-10-23 10:05:30,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:30,940 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2018-10-23 10:05:30,940 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-23 10:05:30,940 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 35 [2018-10-23 10:05:30,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:30,941 INFO L225 Difference]: With dead ends: 58 [2018-10-23 10:05:30,941 INFO L226 Difference]: Without dead ends: 39 [2018-10-23 10:05:30,942 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-23 10:05:30,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-23 10:05:30,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-10-23 10:05:30,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-23 10:05:30,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2018-10-23 10:05:30,949 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 35 [2018-10-23 10:05:30,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:30,949 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2018-10-23 10:05:30,949 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-23 10:05:30,949 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2018-10-23 10:05:30,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-23 10:05:30,950 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:30,951 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:30,951 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:30,951 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:30,951 INFO L82 PathProgramCache]: Analyzing trace with hash 986165306, now seen corresponding path program 5 times [2018-10-23 10:05:30,952 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:30,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:30,953 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:30,953 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:30,953 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:30,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:31,098 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 66 proven. 45 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:31,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:31,101 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:31,101 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:31,101 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:31,101 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:31,102 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 [2018-10-23 10:05:31,111 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:05:31,112 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:05:31,139 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:05:31,139 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:05:31,142 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:31,151 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 66 proven. 45 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:31,151 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:31,345 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 66 proven. 45 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:31,368 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:31,368 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-23 10:05:31,368 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:31,369 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-23 10:05:31,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-23 10:05:31,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-23 10:05:31,370 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 8 states. [2018-10-23 10:05:31,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:31,436 INFO L93 Difference]: Finished difference Result 61 states and 70 transitions. [2018-10-23 10:05:31,438 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-23 10:05:31,438 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 38 [2018-10-23 10:05:31,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:31,439 INFO L225 Difference]: With dead ends: 61 [2018-10-23 10:05:31,439 INFO L226 Difference]: Without dead ends: 42 [2018-10-23 10:05:31,440 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-23 10:05:31,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-23 10:05:31,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-23 10:05:31,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-23 10:05:31,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2018-10-23 10:05:31,447 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 38 [2018-10-23 10:05:31,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:31,448 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2018-10-23 10:05:31,448 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-23 10:05:31,448 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2018-10-23 10:05:31,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-23 10:05:31,449 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:31,449 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:31,450 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:31,450 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:31,450 INFO L82 PathProgramCache]: Analyzing trace with hash -1639044385, now seen corresponding path program 6 times [2018-10-23 10:05:31,450 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:31,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:31,451 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:05:31,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:31,452 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:31,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:31,584 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 77 proven. 63 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:31,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:31,585 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:31,585 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:31,585 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:31,585 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:31,585 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 [2018-10-23 10:05:31,593 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:05:31,593 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:05:31,624 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:05:31,624 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:05:31,627 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:31,636 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 77 proven. 63 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:31,636 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:31,994 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 77 proven. 63 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:32,015 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:32,015 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-23 10:05:32,015 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:32,015 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-23 10:05:32,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-23 10:05:32,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-10-23 10:05:32,016 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand 9 states. [2018-10-23 10:05:32,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:32,065 INFO L93 Difference]: Finished difference Result 64 states and 73 transitions. [2018-10-23 10:05:32,066 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-23 10:05:32,066 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 41 [2018-10-23 10:05:32,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:32,067 INFO L225 Difference]: With dead ends: 64 [2018-10-23 10:05:32,067 INFO L226 Difference]: Without dead ends: 45 [2018-10-23 10:05:32,068 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-10-23 10:05:32,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-23 10:05:32,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-10-23 10:05:32,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-23 10:05:32,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2018-10-23 10:05:32,076 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 41 [2018-10-23 10:05:32,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:32,076 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2018-10-23 10:05:32,076 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-23 10:05:32,076 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2018-10-23 10:05:32,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-23 10:05:32,078 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:32,078 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:32,078 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:32,078 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:32,078 INFO L82 PathProgramCache]: Analyzing trace with hash 2093511194, now seen corresponding path program 7 times [2018-10-23 10:05:32,079 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:32,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:32,080 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:05:32,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:32,080 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:32,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:32,234 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 88 proven. 84 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:32,234 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:32,234 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:32,235 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:32,235 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:32,235 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:32,235 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 10:05:32,243 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:32,243 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:05:32,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:32,261 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:32,271 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 88 proven. 84 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:32,271 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:32,469 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 88 proven. 84 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:32,490 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:32,490 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-23 10:05:32,490 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:32,491 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-23 10:05:32,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-23 10:05:32,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-23 10:05:32,492 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 10 states. [2018-10-23 10:05:32,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:32,553 INFO L93 Difference]: Finished difference Result 67 states and 76 transitions. [2018-10-23 10:05:32,554 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-23 10:05:32,554 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 44 [2018-10-23 10:05:32,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:32,555 INFO L225 Difference]: With dead ends: 67 [2018-10-23 10:05:32,555 INFO L226 Difference]: Without dead ends: 48 [2018-10-23 10:05:32,555 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-23 10:05:32,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-23 10:05:32,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-23 10:05:32,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-23 10:05:32,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2018-10-23 10:05:32,562 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 44 [2018-10-23 10:05:32,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:32,562 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2018-10-23 10:05:32,562 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-23 10:05:32,562 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2018-10-23 10:05:32,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-23 10:05:32,563 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:32,563 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:32,564 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:32,564 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:32,564 INFO L82 PathProgramCache]: Analyzing trace with hash 1953471743, now seen corresponding path program 8 times [2018-10-23 10:05:32,564 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:32,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:32,565 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:32,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:32,566 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:32,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:32,706 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 99 proven. 108 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:32,706 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:32,706 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:32,706 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:32,706 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:32,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:32,707 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 [2018-10-23 10:05:32,715 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:05:32,716 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:05:32,732 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:05:32,732 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:05:32,734 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:32,747 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 99 proven. 108 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:32,747 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:33,009 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 99 proven. 108 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:33,032 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:33,033 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-23 10:05:33,033 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:33,034 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-23 10:05:33,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-23 10:05:33,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-10-23 10:05:33,035 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 11 states. [2018-10-23 10:05:33,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:33,245 INFO L93 Difference]: Finished difference Result 70 states and 79 transitions. [2018-10-23 10:05:33,246 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-23 10:05:33,246 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 47 [2018-10-23 10:05:33,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:33,247 INFO L225 Difference]: With dead ends: 70 [2018-10-23 10:05:33,247 INFO L226 Difference]: Without dead ends: 51 [2018-10-23 10:05:33,248 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-10-23 10:05:33,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-23 10:05:33,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-10-23 10:05:33,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-23 10:05:33,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2018-10-23 10:05:33,256 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 47 [2018-10-23 10:05:33,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:33,256 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2018-10-23 10:05:33,256 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-23 10:05:33,256 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2018-10-23 10:05:33,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-23 10:05:33,257 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:33,257 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:33,258 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:33,258 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:33,258 INFO L82 PathProgramCache]: Analyzing trace with hash 451431418, now seen corresponding path program 9 times [2018-10-23 10:05:33,258 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:33,259 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:33,259 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:05:33,259 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:33,259 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:33,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:33,414 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 110 proven. 135 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:33,414 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:33,414 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:33,414 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:33,415 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:33,415 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:33,415 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 [2018-10-23 10:05:33,422 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:05:33,423 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:05:33,452 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:05:33,453 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:05:33,455 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:33,467 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 110 proven. 135 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:33,467 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:33,693 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 110 proven. 135 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:33,714 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:33,714 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-23 10:05:33,715 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:33,715 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-23 10:05:33,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-23 10:05:33,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-10-23 10:05:33,716 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand 12 states. [2018-10-23 10:05:33,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:33,831 INFO L93 Difference]: Finished difference Result 73 states and 82 transitions. [2018-10-23 10:05:33,831 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-23 10:05:33,831 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 50 [2018-10-23 10:05:33,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:33,832 INFO L225 Difference]: With dead ends: 73 [2018-10-23 10:05:33,832 INFO L226 Difference]: Without dead ends: 54 [2018-10-23 10:05:33,833 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-10-23 10:05:33,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-23 10:05:33,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-10-23 10:05:33,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-23 10:05:33,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2018-10-23 10:05:33,841 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 50 [2018-10-23 10:05:33,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:33,841 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2018-10-23 10:05:33,841 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-23 10:05:33,841 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2018-10-23 10:05:33,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-23 10:05:33,842 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:33,843 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:33,843 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:33,843 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:33,843 INFO L82 PathProgramCache]: Analyzing trace with hash -1862600929, now seen corresponding path program 10 times [2018-10-23 10:05:33,843 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:33,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:33,844 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:05:33,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:33,845 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:33,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:34,032 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 165 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:34,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:34,033 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:34,033 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:34,033 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:34,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:34,033 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 [2018-10-23 10:05:34,041 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:34,042 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:05:34,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:34,060 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:34,080 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 165 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:34,080 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:34,664 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 165 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:34,684 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:34,685 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-23 10:05:34,685 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:34,685 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-23 10:05:34,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-23 10:05:34,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-23 10:05:34,687 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand 13 states. [2018-10-23 10:05:34,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:34,785 INFO L93 Difference]: Finished difference Result 76 states and 85 transitions. [2018-10-23 10:05:34,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-23 10:05:34,787 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 53 [2018-10-23 10:05:34,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:34,789 INFO L225 Difference]: With dead ends: 76 [2018-10-23 10:05:34,789 INFO L226 Difference]: Without dead ends: 57 [2018-10-23 10:05:34,790 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-23 10:05:34,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-23 10:05:34,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-10-23 10:05:34,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-23 10:05:34,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 61 transitions. [2018-10-23 10:05:34,798 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 61 transitions. Word has length 53 [2018-10-23 10:05:34,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:34,798 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 61 transitions. [2018-10-23 10:05:34,798 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-23 10:05:34,798 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 61 transitions. [2018-10-23 10:05:34,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-23 10:05:34,799 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:34,800 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:34,800 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:34,800 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:34,800 INFO L82 PathProgramCache]: Analyzing trace with hash -680182310, now seen corresponding path program 11 times [2018-10-23 10:05:34,800 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:34,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:34,801 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:34,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:34,802 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:34,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:34,986 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 132 proven. 198 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:34,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:34,987 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:34,987 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:34,987 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:34,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:34,987 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 [2018-10-23 10:05:34,997 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:05:34,997 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:05:35,023 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:05:35,023 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:05:35,026 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:35,038 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 132 proven. 198 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:35,038 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:35,636 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 132 proven. 198 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:35,657 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:35,657 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-23 10:05:35,657 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:35,657 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-23 10:05:35,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-23 10:05:35,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-23 10:05:35,658 INFO L87 Difference]: Start difference. First operand 57 states and 61 transitions. Second operand 14 states. [2018-10-23 10:05:35,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:35,716 INFO L93 Difference]: Finished difference Result 79 states and 88 transitions. [2018-10-23 10:05:35,716 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-23 10:05:35,716 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 56 [2018-10-23 10:05:35,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:35,717 INFO L225 Difference]: With dead ends: 79 [2018-10-23 10:05:35,717 INFO L226 Difference]: Without dead ends: 60 [2018-10-23 10:05:35,718 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-23 10:05:35,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-23 10:05:35,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-10-23 10:05:35,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-23 10:05:35,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2018-10-23 10:05:35,725 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 56 [2018-10-23 10:05:35,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:35,725 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2018-10-23 10:05:35,725 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-23 10:05:35,725 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2018-10-23 10:05:35,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-23 10:05:35,726 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:35,727 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:35,727 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:35,727 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:35,727 INFO L82 PathProgramCache]: Analyzing trace with hash 1726101823, now seen corresponding path program 12 times [2018-10-23 10:05:35,727 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:35,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:35,728 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:05:35,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:35,729 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:35,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:36,241 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 143 proven. 234 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:36,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:36,242 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:36,242 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:36,242 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:36,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:36,242 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 [2018-10-23 10:05:36,250 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:05:36,250 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:05:36,294 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:05:36,294 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:05:36,297 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:36,310 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 143 proven. 234 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:36,310 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:36,593 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 143 proven. 234 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:36,615 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:36,615 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-23 10:05:36,615 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:36,615 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-23 10:05:36,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-23 10:05:36,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-23 10:05:36,616 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand 15 states. [2018-10-23 10:05:36,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:36,664 INFO L93 Difference]: Finished difference Result 82 states and 91 transitions. [2018-10-23 10:05:36,664 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-23 10:05:36,664 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 59 [2018-10-23 10:05:36,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:36,665 INFO L225 Difference]: With dead ends: 82 [2018-10-23 10:05:36,665 INFO L226 Difference]: Without dead ends: 63 [2018-10-23 10:05:36,667 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-23 10:05:36,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-23 10:05:36,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-10-23 10:05:36,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-23 10:05:36,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 67 transitions. [2018-10-23 10:05:36,674 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 67 transitions. Word has length 59 [2018-10-23 10:05:36,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:36,674 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 67 transitions. [2018-10-23 10:05:36,674 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-23 10:05:36,674 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 67 transitions. [2018-10-23 10:05:36,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-23 10:05:36,675 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:36,676 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 13, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:36,676 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:36,676 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:36,676 INFO L82 PathProgramCache]: Analyzing trace with hash 37570490, now seen corresponding path program 13 times [2018-10-23 10:05:36,676 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:36,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:36,677 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:05:36,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:36,678 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:36,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:36,991 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 154 proven. 273 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:36,992 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:36,992 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:36,992 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:36,992 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:36,992 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:36,992 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 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 [2018-10-23 10:05:37,002 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:37,002 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:05:37,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:37,032 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:37,042 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 154 proven. 273 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:37,043 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:37,741 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 154 proven. 273 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:37,763 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:37,763 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-23 10:05:37,763 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:37,763 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-23 10:05:37,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-23 10:05:37,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-23 10:05:37,765 INFO L87 Difference]: Start difference. First operand 63 states and 67 transitions. Second operand 16 states. [2018-10-23 10:05:37,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:37,845 INFO L93 Difference]: Finished difference Result 85 states and 94 transitions. [2018-10-23 10:05:37,845 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-23 10:05:37,845 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 62 [2018-10-23 10:05:37,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:37,846 INFO L225 Difference]: With dead ends: 85 [2018-10-23 10:05:37,846 INFO L226 Difference]: Without dead ends: 66 [2018-10-23 10:05:37,847 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-23 10:05:37,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-23 10:05:37,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-10-23 10:05:37,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-23 10:05:37,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2018-10-23 10:05:37,864 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 62 [2018-10-23 10:05:37,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:37,868 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2018-10-23 10:05:37,868 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-23 10:05:37,868 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2018-10-23 10:05:37,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-23 10:05:37,869 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:37,869 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 14, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:37,870 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:37,873 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:37,873 INFO L82 PathProgramCache]: Analyzing trace with hash -342400161, now seen corresponding path program 14 times [2018-10-23 10:05:37,873 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:37,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:37,874 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:37,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:37,874 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:37,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:38,182 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 165 proven. 315 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:38,182 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:38,182 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:38,182 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:38,182 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:38,183 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:38,183 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 [2018-10-23 10:05:38,191 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:05:38,191 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:05:38,208 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:05:38,209 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:05:38,212 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:38,225 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 165 proven. 315 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:38,226 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:38,798 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 165 proven. 315 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:38,819 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:38,819 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-23 10:05:38,819 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:38,819 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-23 10:05:38,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-23 10:05:38,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-10-23 10:05:38,820 INFO L87 Difference]: Start difference. First operand 66 states and 70 transitions. Second operand 17 states. [2018-10-23 10:05:38,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:38,898 INFO L93 Difference]: Finished difference Result 88 states and 97 transitions. [2018-10-23 10:05:38,899 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-23 10:05:38,899 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 65 [2018-10-23 10:05:38,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:38,900 INFO L225 Difference]: With dead ends: 88 [2018-10-23 10:05:38,900 INFO L226 Difference]: Without dead ends: 69 [2018-10-23 10:05:38,902 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-10-23 10:05:38,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-23 10:05:38,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-10-23 10:05:38,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-23 10:05:38,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 73 transitions. [2018-10-23 10:05:38,909 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 73 transitions. Word has length 65 [2018-10-23 10:05:38,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:38,909 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 73 transitions. [2018-10-23 10:05:38,909 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-23 10:05:38,909 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 73 transitions. [2018-10-23 10:05:38,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-23 10:05:38,910 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:38,911 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:38,911 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:38,911 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:38,911 INFO L82 PathProgramCache]: Analyzing trace with hash 1485728154, now seen corresponding path program 15 times [2018-10-23 10:05:38,911 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:38,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:38,912 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:05:38,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:38,912 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:38,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:39,134 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 176 proven. 360 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:39,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:39,135 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:39,135 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:39,135 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:39,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:39,135 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 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 [2018-10-23 10:05:39,143 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:05:39,143 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:05:39,161 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:05:39,161 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:05:39,162 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:39,172 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 176 proven. 360 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:39,173 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:39,521 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 176 proven. 360 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:39,541 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:39,542 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-23 10:05:39,542 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:39,542 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-23 10:05:39,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-23 10:05:39,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-10-23 10:05:39,543 INFO L87 Difference]: Start difference. First operand 69 states and 73 transitions. Second operand 18 states. [2018-10-23 10:05:39,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:39,713 INFO L93 Difference]: Finished difference Result 91 states and 100 transitions. [2018-10-23 10:05:39,713 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-23 10:05:39,713 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 68 [2018-10-23 10:05:39,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:39,714 INFO L225 Difference]: With dead ends: 91 [2018-10-23 10:05:39,714 INFO L226 Difference]: Without dead ends: 72 [2018-10-23 10:05:39,715 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-10-23 10:05:39,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-23 10:05:39,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-10-23 10:05:39,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-23 10:05:39,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 76 transitions. [2018-10-23 10:05:39,720 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 76 transitions. Word has length 68 [2018-10-23 10:05:39,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:39,720 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 76 transitions. [2018-10-23 10:05:39,720 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-23 10:05:39,720 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 76 transitions. [2018-10-23 10:05:39,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-23 10:05:39,721 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:39,721 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 16, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:39,721 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:39,722 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:39,722 INFO L82 PathProgramCache]: Analyzing trace with hash -1223920257, now seen corresponding path program 16 times [2018-10-23 10:05:39,722 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:39,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:39,723 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:05:39,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:39,723 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:39,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:40,300 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 187 proven. 408 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:40,301 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:40,301 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:40,301 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:40,301 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:40,301 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:40,302 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 [2018-10-23 10:05:40,317 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:40,317 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:05:40,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:40,347 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:40,356 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 187 proven. 408 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:40,356 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:41,393 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 187 proven. 408 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:41,416 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:41,416 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-23 10:05:41,416 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:41,416 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-23 10:05:41,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-23 10:05:41,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-10-23 10:05:41,418 INFO L87 Difference]: Start difference. First operand 72 states and 76 transitions. Second operand 19 states. [2018-10-23 10:05:41,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:41,666 INFO L93 Difference]: Finished difference Result 94 states and 103 transitions. [2018-10-23 10:05:41,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-23 10:05:41,669 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 71 [2018-10-23 10:05:41,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:41,670 INFO L225 Difference]: With dead ends: 94 [2018-10-23 10:05:41,670 INFO L226 Difference]: Without dead ends: 75 [2018-10-23 10:05:41,671 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-10-23 10:05:41,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-23 10:05:41,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-10-23 10:05:41,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-23 10:05:41,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 79 transitions. [2018-10-23 10:05:41,676 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 79 transitions. Word has length 71 [2018-10-23 10:05:41,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:41,676 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 79 transitions. [2018-10-23 10:05:41,677 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-23 10:05:41,677 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 79 transitions. [2018-10-23 10:05:41,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-23 10:05:41,677 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:41,678 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 17, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:41,678 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:41,678 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:41,678 INFO L82 PathProgramCache]: Analyzing trace with hash -449404038, now seen corresponding path program 17 times [2018-10-23 10:05:41,678 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:41,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:41,679 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:41,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:41,680 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:41,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:41,941 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 198 proven. 459 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:41,941 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:41,941 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:41,941 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:41,942 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:41,942 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:41,942 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 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 [2018-10-23 10:05:41,949 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:05:41,949 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:05:41,965 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:05:41,965 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:05:41,967 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:41,977 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 198 proven. 459 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:41,978 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:42,502 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 198 proven. 459 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:42,523 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:42,524 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-23 10:05:42,524 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:42,524 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-23 10:05:42,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-23 10:05:42,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-10-23 10:05:42,525 INFO L87 Difference]: Start difference. First operand 75 states and 79 transitions. Second operand 20 states. [2018-10-23 10:05:42,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:42,618 INFO L93 Difference]: Finished difference Result 97 states and 106 transitions. [2018-10-23 10:05:42,618 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-23 10:05:42,618 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 74 [2018-10-23 10:05:42,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:42,619 INFO L225 Difference]: With dead ends: 97 [2018-10-23 10:05:42,619 INFO L226 Difference]: Without dead ends: 78 [2018-10-23 10:05:42,620 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-10-23 10:05:42,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-23 10:05:42,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2018-10-23 10:05:42,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-23 10:05:42,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 82 transitions. [2018-10-23 10:05:42,624 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 82 transitions. Word has length 74 [2018-10-23 10:05:42,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:42,624 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 82 transitions. [2018-10-23 10:05:42,624 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-23 10:05:42,624 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 82 transitions. [2018-10-23 10:05:42,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-23 10:05:42,625 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:42,625 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 18, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:42,625 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:42,626 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:42,626 INFO L82 PathProgramCache]: Analyzing trace with hash 598962079, now seen corresponding path program 18 times [2018-10-23 10:05:42,626 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:42,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:42,627 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:05:42,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:42,627 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:42,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:42,847 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 209 proven. 513 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:42,847 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:42,847 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:42,848 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:42,848 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:42,848 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:42,848 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 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 [2018-10-23 10:05:42,859 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:05:42,859 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:05:42,875 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:05:42,875 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:05:42,877 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:42,889 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 209 proven. 513 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:42,889 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:43,802 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 209 proven. 513 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:43,823 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:43,823 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-23 10:05:43,823 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:43,823 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-23 10:05:43,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-23 10:05:43,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-10-23 10:05:43,825 INFO L87 Difference]: Start difference. First operand 78 states and 82 transitions. Second operand 21 states. [2018-10-23 10:05:43,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:43,927 INFO L93 Difference]: Finished difference Result 100 states and 109 transitions. [2018-10-23 10:05:43,927 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-23 10:05:43,928 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 77 [2018-10-23 10:05:43,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:43,929 INFO L225 Difference]: With dead ends: 100 [2018-10-23 10:05:43,929 INFO L226 Difference]: Without dead ends: 81 [2018-10-23 10:05:43,930 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-10-23 10:05:43,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-10-23 10:05:43,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2018-10-23 10:05:43,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-10-23 10:05:43,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 85 transitions. [2018-10-23 10:05:43,936 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 85 transitions. Word has length 77 [2018-10-23 10:05:43,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:43,937 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 85 transitions. [2018-10-23 10:05:43,937 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-23 10:05:43,937 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 85 transitions. [2018-10-23 10:05:43,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-10-23 10:05:43,938 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:43,938 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 19, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:43,938 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:43,938 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:43,938 INFO L82 PathProgramCache]: Analyzing trace with hash -528222886, now seen corresponding path program 19 times [2018-10-23 10:05:43,938 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:43,939 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:43,939 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:05:43,939 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:43,939 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:43,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:44,166 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 220 proven. 570 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:44,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:44,166 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:44,166 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:44,166 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:44,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:44,166 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 [2018-10-23 10:05:44,176 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:44,177 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:05:44,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:44,195 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:44,212 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 220 proven. 570 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:44,212 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:44,747 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 220 proven. 570 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:44,770 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:44,770 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-23 10:05:44,770 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:44,771 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-23 10:05:44,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-23 10:05:44,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-10-23 10:05:44,772 INFO L87 Difference]: Start difference. First operand 81 states and 85 transitions. Second operand 22 states. [2018-10-23 10:05:44,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:44,850 INFO L93 Difference]: Finished difference Result 103 states and 112 transitions. [2018-10-23 10:05:44,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-23 10:05:44,852 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 80 [2018-10-23 10:05:44,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:44,854 INFO L225 Difference]: With dead ends: 103 [2018-10-23 10:05:44,854 INFO L226 Difference]: Without dead ends: 84 [2018-10-23 10:05:44,855 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-10-23 10:05:44,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-23 10:05:44,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2018-10-23 10:05:44,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-23 10:05:44,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 88 transitions. [2018-10-23 10:05:44,859 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 88 transitions. Word has length 80 [2018-10-23 10:05:44,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:44,859 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 88 transitions. [2018-10-23 10:05:44,859 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-23 10:05:44,860 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 88 transitions. [2018-10-23 10:05:44,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-23 10:05:44,860 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:44,860 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 20, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:44,860 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:44,861 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:44,861 INFO L82 PathProgramCache]: Analyzing trace with hash 1853772223, now seen corresponding path program 20 times [2018-10-23 10:05:44,861 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:44,862 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:44,862 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:44,862 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:44,862 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:44,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:45,145 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 231 proven. 630 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:45,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:45,145 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:45,145 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:45,145 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:45,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:45,146 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 10:05:45,153 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:05:45,153 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:05:45,172 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:05:45,173 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:05:45,175 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:45,190 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 231 proven. 630 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:45,190 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:45,729 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 231 proven. 630 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:45,749 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:45,750 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-23 10:05:45,750 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:45,750 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-23 10:05:45,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-23 10:05:45,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-10-23 10:05:45,751 INFO L87 Difference]: Start difference. First operand 84 states and 88 transitions. Second operand 23 states. [2018-10-23 10:05:45,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:45,864 INFO L93 Difference]: Finished difference Result 106 states and 115 transitions. [2018-10-23 10:05:45,865 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-23 10:05:45,865 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 83 [2018-10-23 10:05:45,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:45,866 INFO L225 Difference]: With dead ends: 106 [2018-10-23 10:05:45,866 INFO L226 Difference]: Without dead ends: 87 [2018-10-23 10:05:45,868 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-10-23 10:05:45,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-23 10:05:45,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-10-23 10:05:45,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-10-23 10:05:45,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 91 transitions. [2018-10-23 10:05:45,875 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 91 transitions. Word has length 83 [2018-10-23 10:05:45,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:45,875 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 91 transitions. [2018-10-23 10:05:45,875 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-23 10:05:45,875 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 91 transitions. [2018-10-23 10:05:45,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-10-23 10:05:45,876 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:45,876 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 21, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:45,877 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:45,877 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:45,877 INFO L82 PathProgramCache]: Analyzing trace with hash -1874567366, now seen corresponding path program 21 times [2018-10-23 10:05:45,877 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:45,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:45,878 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:05:45,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:45,878 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:45,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:46,288 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 242 proven. 693 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:46,288 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:46,288 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:46,288 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:46,289 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:46,289 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:46,289 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 10:05:46,298 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:05:46,298 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:05:46,320 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:05:46,321 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:05:46,323 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:46,349 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 242 proven. 693 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:46,349 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:46,930 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 242 proven. 693 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:46,950 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:46,951 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-10-23 10:05:46,951 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:46,951 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-23 10:05:46,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-23 10:05:46,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-10-23 10:05:46,952 INFO L87 Difference]: Start difference. First operand 87 states and 91 transitions. Second operand 24 states. [2018-10-23 10:05:47,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:47,065 INFO L93 Difference]: Finished difference Result 109 states and 118 transitions. [2018-10-23 10:05:47,066 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-23 10:05:47,066 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 86 [2018-10-23 10:05:47,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:47,067 INFO L225 Difference]: With dead ends: 109 [2018-10-23 10:05:47,067 INFO L226 Difference]: Without dead ends: 90 [2018-10-23 10:05:47,069 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-10-23 10:05:47,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-23 10:05:47,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2018-10-23 10:05:47,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-23 10:05:47,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2018-10-23 10:05:47,075 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 86 [2018-10-23 10:05:47,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:47,075 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2018-10-23 10:05:47,075 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-23 10:05:47,076 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2018-10-23 10:05:47,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-23 10:05:47,076 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:47,076 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 22, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:47,076 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:47,077 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:47,077 INFO L82 PathProgramCache]: Analyzing trace with hash -690021409, now seen corresponding path program 22 times [2018-10-23 10:05:47,077 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:47,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:47,078 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:05:47,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:47,078 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:47,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:47,869 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 253 proven. 759 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:47,869 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:47,869 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:47,870 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:47,870 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:47,870 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:47,870 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 [2018-10-23 10:05:47,881 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:47,881 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:05:47,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:47,902 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:47,917 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 253 proven. 759 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:47,917 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:48,821 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 253 proven. 759 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:48,841 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:48,842 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-10-23 10:05:48,842 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:48,842 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-23 10:05:48,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-23 10:05:48,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-10-23 10:05:48,843 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand 25 states. [2018-10-23 10:05:48,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:48,976 INFO L93 Difference]: Finished difference Result 112 states and 121 transitions. [2018-10-23 10:05:48,980 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-23 10:05:48,980 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 89 [2018-10-23 10:05:48,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:48,981 INFO L225 Difference]: With dead ends: 112 [2018-10-23 10:05:48,981 INFO L226 Difference]: Without dead ends: 93 [2018-10-23 10:05:48,982 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-10-23 10:05:48,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-10-23 10:05:48,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2018-10-23 10:05:48,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-10-23 10:05:48,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 97 transitions. [2018-10-23 10:05:48,988 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 97 transitions. Word has length 89 [2018-10-23 10:05:48,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:48,988 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 97 transitions. [2018-10-23 10:05:48,988 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-23 10:05:48,988 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 97 transitions. [2018-10-23 10:05:48,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-10-23 10:05:48,989 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:48,989 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 23, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:48,989 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:48,990 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:48,990 INFO L82 PathProgramCache]: Analyzing trace with hash 667279642, now seen corresponding path program 23 times [2018-10-23 10:05:48,990 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:48,991 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:48,991 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:48,991 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:48,991 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:48,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:49,622 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 264 proven. 828 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:49,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:49,622 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:49,622 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:49,622 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:49,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:49,622 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 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 [2018-10-23 10:05:49,629 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:05:49,630 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:05:49,663 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:05:49,663 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:05:49,665 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:49,680 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 264 proven. 828 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:49,680 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:50,334 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 264 proven. 828 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:50,363 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:50,363 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2018-10-23 10:05:50,363 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:50,363 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-23 10:05:50,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-23 10:05:50,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-10-23 10:05:50,365 INFO L87 Difference]: Start difference. First operand 93 states and 97 transitions. Second operand 26 states. [2018-10-23 10:05:50,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:50,465 INFO L93 Difference]: Finished difference Result 115 states and 124 transitions. [2018-10-23 10:05:50,465 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-23 10:05:50,465 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 92 [2018-10-23 10:05:50,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:50,467 INFO L225 Difference]: With dead ends: 115 [2018-10-23 10:05:50,467 INFO L226 Difference]: Without dead ends: 96 [2018-10-23 10:05:50,468 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-10-23 10:05:50,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-23 10:05:50,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2018-10-23 10:05:50,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-10-23 10:05:50,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 100 transitions. [2018-10-23 10:05:50,475 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 100 transitions. Word has length 92 [2018-10-23 10:05:50,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:50,475 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 100 transitions. [2018-10-23 10:05:50,475 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-23 10:05:50,475 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 100 transitions. [2018-10-23 10:05:50,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-23 10:05:50,476 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:50,476 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 24, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:50,476 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:50,476 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:50,476 INFO L82 PathProgramCache]: Analyzing trace with hash -1094201857, now seen corresponding path program 24 times [2018-10-23 10:05:50,476 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:50,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:50,477 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:05:50,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:50,477 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:50,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:50,848 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 275 proven. 900 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:50,848 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:50,848 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:50,848 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:50,848 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:50,849 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:50,849 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 [2018-10-23 10:05:50,858 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:05:50,858 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:05:50,878 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:05:50,879 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:05:50,880 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:50,894 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 275 proven. 900 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:50,894 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:51,630 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 275 proven. 900 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:51,650 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:51,650 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2018-10-23 10:05:51,650 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:51,651 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-23 10:05:51,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-23 10:05:51,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:05:51,652 INFO L87 Difference]: Start difference. First operand 96 states and 100 transitions. Second operand 27 states. [2018-10-23 10:05:51,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:51,783 INFO L93 Difference]: Finished difference Result 118 states and 127 transitions. [2018-10-23 10:05:51,783 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-23 10:05:51,783 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 95 [2018-10-23 10:05:51,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:51,784 INFO L225 Difference]: With dead ends: 118 [2018-10-23 10:05:51,784 INFO L226 Difference]: Without dead ends: 99 [2018-10-23 10:05:51,785 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 166 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:05:51,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-10-23 10:05:51,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2018-10-23 10:05:51,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-23 10:05:51,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 103 transitions. [2018-10-23 10:05:51,791 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 103 transitions. Word has length 95 [2018-10-23 10:05:51,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:51,792 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 103 transitions. [2018-10-23 10:05:51,792 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-23 10:05:51,792 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 103 transitions. [2018-10-23 10:05:51,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-10-23 10:05:51,792 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:51,792 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 25, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:51,792 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:51,793 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:51,793 INFO L82 PathProgramCache]: Analyzing trace with hash -1479116038, now seen corresponding path program 25 times [2018-10-23 10:05:51,793 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:51,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:51,793 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:05:51,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:51,794 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:51,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:52,348 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 286 proven. 975 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:52,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:52,349 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:52,349 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:52,349 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:52,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:52,349 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 [2018-10-23 10:05:52,357 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:52,357 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:05:52,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:52,380 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:52,392 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 286 proven. 975 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:52,392 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:53,914 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 286 proven. 975 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:53,948 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:53,948 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 52 [2018-10-23 10:05:53,948 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:53,948 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-23 10:05:53,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-23 10:05:53,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:05:53,950 INFO L87 Difference]: Start difference. First operand 99 states and 103 transitions. Second operand 28 states. [2018-10-23 10:05:54,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:54,206 INFO L93 Difference]: Finished difference Result 121 states and 130 transitions. [2018-10-23 10:05:54,206 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-23 10:05:54,207 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 98 [2018-10-23 10:05:54,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:54,208 INFO L225 Difference]: With dead ends: 121 [2018-10-23 10:05:54,208 INFO L226 Difference]: Without dead ends: 102 [2018-10-23 10:05:54,210 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 171 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:05:54,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-10-23 10:05:54,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 102. [2018-10-23 10:05:54,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-23 10:05:54,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 106 transitions. [2018-10-23 10:05:54,216 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 106 transitions. Word has length 98 [2018-10-23 10:05:54,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:54,216 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 106 transitions. [2018-10-23 10:05:54,216 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-23 10:05:54,216 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 106 transitions. [2018-10-23 10:05:54,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-23 10:05:54,217 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:54,217 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 26, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:54,217 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:54,217 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:54,217 INFO L82 PathProgramCache]: Analyzing trace with hash -894801889, now seen corresponding path program 26 times [2018-10-23 10:05:54,217 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:54,218 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:54,218 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:54,218 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:54,218 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:54,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:54,619 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 297 proven. 1053 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:54,619 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:54,619 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:54,619 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:54,619 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:54,619 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:54,619 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 [2018-10-23 10:05:54,629 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:05:54,629 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:05:54,651 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:05:54,651 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:05:54,653 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:54,667 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 297 proven. 1053 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:54,667 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:55,397 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 297 proven. 1053 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:55,417 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:55,417 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 52 [2018-10-23 10:05:55,417 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:55,417 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-23 10:05:55,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-23 10:05:55,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:05:55,419 INFO L87 Difference]: Start difference. First operand 102 states and 106 transitions. Second operand 29 states. [2018-10-23 10:05:55,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:55,526 INFO L93 Difference]: Finished difference Result 124 states and 133 transitions. [2018-10-23 10:05:55,527 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-23 10:05:55,527 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 101 [2018-10-23 10:05:55,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:55,528 INFO L225 Difference]: With dead ends: 124 [2018-10-23 10:05:55,528 INFO L226 Difference]: Without dead ends: 105 [2018-10-23 10:05:55,530 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 176 SyntacticMatches, 4 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:05:55,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-23 10:05:55,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2018-10-23 10:05:55,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-10-23 10:05:55,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 109 transitions. [2018-10-23 10:05:55,537 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 109 transitions. Word has length 101 [2018-10-23 10:05:55,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:55,537 INFO L481 AbstractCegarLoop]: Abstraction has 105 states and 109 transitions. [2018-10-23 10:05:55,537 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-23 10:05:55,537 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 109 transitions. [2018-10-23 10:05:55,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-23 10:05:55,538 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:55,538 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 27, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:55,538 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:55,539 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:55,539 INFO L82 PathProgramCache]: Analyzing trace with hash -1094439718, now seen corresponding path program 27 times [2018-10-23 10:05:55,539 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:55,539 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:55,539 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:05:55,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:55,540 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:55,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:56,076 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 308 proven. 1134 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:56,076 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:56,076 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:56,076 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:56,077 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:56,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:56,077 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 [2018-10-23 10:05:56,086 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:05:56,086 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:05:56,113 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:05:56,113 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:05:56,115 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:56,141 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 308 proven. 1134 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:56,141 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:57,239 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 308 proven. 1134 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:57,259 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:57,259 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 52 [2018-10-23 10:05:57,260 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:57,260 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-23 10:05:57,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-23 10:05:57,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:05:57,261 INFO L87 Difference]: Start difference. First operand 105 states and 109 transitions. Second operand 30 states. [2018-10-23 10:05:57,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:57,424 INFO L93 Difference]: Finished difference Result 127 states and 136 transitions. [2018-10-23 10:05:57,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-23 10:05:57,425 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 104 [2018-10-23 10:05:57,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:57,426 INFO L225 Difference]: With dead ends: 127 [2018-10-23 10:05:57,426 INFO L226 Difference]: Without dead ends: 108 [2018-10-23 10:05:57,427 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 181 SyntacticMatches, 6 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:05:57,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2018-10-23 10:05:57,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2018-10-23 10:05:57,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-10-23 10:05:57,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 112 transitions. [2018-10-23 10:05:57,434 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 112 transitions. Word has length 104 [2018-10-23 10:05:57,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:57,434 INFO L481 AbstractCegarLoop]: Abstraction has 108 states and 112 transitions. [2018-10-23 10:05:57,434 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-23 10:05:57,434 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 112 transitions. [2018-10-23 10:05:57,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-10-23 10:05:57,435 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:57,435 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 28, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:57,435 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:57,435 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:57,436 INFO L82 PathProgramCache]: Analyzing trace with hash 24701503, now seen corresponding path program 28 times [2018-10-23 10:05:57,436 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:57,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:57,436 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:05:57,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:57,437 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:57,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:57,845 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 319 proven. 1218 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:57,846 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:57,846 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:57,846 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:57,846 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:57,846 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:57,846 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 [2018-10-23 10:05:57,854 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:57,854 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:05:57,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:57,881 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:57,894 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 319 proven. 1218 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:57,894 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:05:58,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 319 proven. 1218 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:58,657 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:05:58,657 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 52 [2018-10-23 10:05:58,657 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:05:58,657 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-23 10:05:58,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-23 10:05:58,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:05:58,659 INFO L87 Difference]: Start difference. First operand 108 states and 112 transitions. Second operand 31 states. [2018-10-23 10:05:58,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:05:58,830 INFO L93 Difference]: Finished difference Result 130 states and 139 transitions. [2018-10-23 10:05:58,830 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-23 10:05:58,830 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 107 [2018-10-23 10:05:58,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:05:58,831 INFO L225 Difference]: With dead ends: 130 [2018-10-23 10:05:58,831 INFO L226 Difference]: Without dead ends: 111 [2018-10-23 10:05:58,832 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 186 SyntacticMatches, 8 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:05:58,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-10-23 10:05:58,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2018-10-23 10:05:58,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-10-23 10:05:58,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 115 transitions. [2018-10-23 10:05:58,838 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 115 transitions. Word has length 107 [2018-10-23 10:05:58,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:05:58,839 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 115 transitions. [2018-10-23 10:05:58,839 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-23 10:05:58,839 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 115 transitions. [2018-10-23 10:05:58,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-10-23 10:05:58,839 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:05:58,840 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 29, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:05:58,840 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:05:58,840 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:05:58,840 INFO L82 PathProgramCache]: Analyzing trace with hash -1470302534, now seen corresponding path program 29 times [2018-10-23 10:05:58,840 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:05:58,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:58,841 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:05:58,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:05:58,841 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:05:58,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:05:59,477 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 330 proven. 1305 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:59,477 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:59,477 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:05:59,477 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:05:59,478 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:05:59,478 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:05:59,478 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 [2018-10-23 10:05:59,485 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:05:59,485 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:05:59,508 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:05:59,508 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:05:59,510 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:05:59,523 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 330 proven. 1305 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:05:59,524 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:00,310 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 330 proven. 1305 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:00,331 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:00,331 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 52 [2018-10-23 10:06:00,331 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:00,332 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-23 10:06:00,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-23 10:06:00,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:00,333 INFO L87 Difference]: Start difference. First operand 111 states and 115 transitions. Second operand 32 states. [2018-10-23 10:06:00,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:00,489 INFO L93 Difference]: Finished difference Result 133 states and 142 transitions. [2018-10-23 10:06:00,492 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-23 10:06:00,492 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 110 [2018-10-23 10:06:00,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:00,493 INFO L225 Difference]: With dead ends: 133 [2018-10-23 10:06:00,493 INFO L226 Difference]: Without dead ends: 114 [2018-10-23 10:06:00,494 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 191 SyntacticMatches, 10 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:00,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-23 10:06:00,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2018-10-23 10:06:00,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-10-23 10:06:00,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 118 transitions. [2018-10-23 10:06:00,506 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 118 transitions. Word has length 110 [2018-10-23 10:06:00,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:00,506 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 118 transitions. [2018-10-23 10:06:00,506 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-23 10:06:00,506 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 118 transitions. [2018-10-23 10:06:00,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-10-23 10:06:00,507 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:00,507 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 30, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:00,507 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:00,507 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:00,508 INFO L82 PathProgramCache]: Analyzing trace with hash -324709281, now seen corresponding path program 30 times [2018-10-23 10:06:00,508 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:00,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:00,509 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:06:00,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:00,509 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:00,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:01,020 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 341 proven. 1395 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:01,020 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:01,020 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:01,021 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:01,021 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:01,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:01,021 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 [2018-10-23 10:06:01,029 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:06:01,029 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:06:01,054 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:06:01,054 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:06:01,056 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:01,069 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 341 proven. 1395 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:01,070 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:01,867 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 341 proven. 1395 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:01,888 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:01,888 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 52 [2018-10-23 10:06:01,889 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:01,889 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-23 10:06:01,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-23 10:06:01,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:01,890 INFO L87 Difference]: Start difference. First operand 114 states and 118 transitions. Second operand 33 states. [2018-10-23 10:06:02,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:02,037 INFO L93 Difference]: Finished difference Result 136 states and 145 transitions. [2018-10-23 10:06:02,037 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-23 10:06:02,037 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 113 [2018-10-23 10:06:02,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:02,038 INFO L225 Difference]: With dead ends: 136 [2018-10-23 10:06:02,038 INFO L226 Difference]: Without dead ends: 117 [2018-10-23 10:06:02,039 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 196 SyntacticMatches, 12 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 294 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:02,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-10-23 10:06:02,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2018-10-23 10:06:02,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-23 10:06:02,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 121 transitions. [2018-10-23 10:06:02,045 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 121 transitions. Word has length 113 [2018-10-23 10:06:02,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:02,046 INFO L481 AbstractCegarLoop]: Abstraction has 117 states and 121 transitions. [2018-10-23 10:06:02,046 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-23 10:06:02,046 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 121 transitions. [2018-10-23 10:06:02,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-23 10:06:02,046 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:02,046 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 31, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:02,047 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:02,047 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:02,047 INFO L82 PathProgramCache]: Analyzing trace with hash 233756826, now seen corresponding path program 31 times [2018-10-23 10:06:02,047 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:02,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:02,047 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:06:02,048 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:02,048 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:02,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:02,614 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 352 proven. 1488 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:02,614 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:02,614 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:02,614 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:02,614 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:02,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:02,615 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 [2018-10-23 10:06:02,623 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:06:02,623 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:06:02,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:02,648 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:02,667 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 352 proven. 1488 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:02,667 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:03,470 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 352 proven. 1488 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:03,491 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:03,491 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 52 [2018-10-23 10:06:03,491 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:03,492 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-23 10:06:03,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-23 10:06:03,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:03,492 INFO L87 Difference]: Start difference. First operand 117 states and 121 transitions. Second operand 34 states. [2018-10-23 10:06:03,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:03,615 INFO L93 Difference]: Finished difference Result 139 states and 148 transitions. [2018-10-23 10:06:03,616 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-23 10:06:03,616 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 116 [2018-10-23 10:06:03,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:03,617 INFO L225 Difference]: With dead ends: 139 [2018-10-23 10:06:03,617 INFO L226 Difference]: Without dead ends: 120 [2018-10-23 10:06:03,618 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 201 SyntacticMatches, 14 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 343 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:03,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-10-23 10:06:03,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2018-10-23 10:06:03,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-10-23 10:06:03,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 124 transitions. [2018-10-23 10:06:03,625 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 124 transitions. Word has length 116 [2018-10-23 10:06:03,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:03,625 INFO L481 AbstractCegarLoop]: Abstraction has 120 states and 124 transitions. [2018-10-23 10:06:03,625 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-23 10:06:03,626 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 124 transitions. [2018-10-23 10:06:03,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-23 10:06:03,626 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:03,626 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 32, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:03,627 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:03,627 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:03,627 INFO L82 PathProgramCache]: Analyzing trace with hash -1205754241, now seen corresponding path program 32 times [2018-10-23 10:06:03,627 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:03,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:03,628 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:06:03,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:03,628 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:03,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:04,638 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 363 proven. 1584 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:04,639 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:04,639 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:04,639 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:04,639 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:04,639 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:04,639 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 [2018-10-23 10:06:04,647 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:06:04,647 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:06:04,674 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:06:04,674 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:06:04,676 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:04,697 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 363 proven. 1584 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:04,697 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:05,748 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 363 proven. 1584 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:05,768 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:05,768 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 52 [2018-10-23 10:06:05,768 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:05,768 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-23 10:06:05,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-23 10:06:05,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:05,769 INFO L87 Difference]: Start difference. First operand 120 states and 124 transitions. Second operand 35 states. [2018-10-23 10:06:05,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:05,931 INFO L93 Difference]: Finished difference Result 142 states and 151 transitions. [2018-10-23 10:06:05,931 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-23 10:06:05,931 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 119 [2018-10-23 10:06:05,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:05,933 INFO L225 Difference]: With dead ends: 142 [2018-10-23 10:06:05,933 INFO L226 Difference]: Without dead ends: 123 [2018-10-23 10:06:05,933 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 206 SyntacticMatches, 16 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 392 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:05,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-23 10:06:05,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2018-10-23 10:06:05,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-10-23 10:06:05,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 127 transitions. [2018-10-23 10:06:05,941 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 127 transitions. Word has length 119 [2018-10-23 10:06:05,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:05,941 INFO L481 AbstractCegarLoop]: Abstraction has 123 states and 127 transitions. [2018-10-23 10:06:05,941 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-23 10:06:05,941 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 127 transitions. [2018-10-23 10:06:05,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-10-23 10:06:05,942 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:05,942 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 33, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:05,942 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:05,942 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:05,943 INFO L82 PathProgramCache]: Analyzing trace with hash -431500678, now seen corresponding path program 33 times [2018-10-23 10:06:05,943 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:05,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:05,943 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:06:05,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:05,944 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:05,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:07,559 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 374 proven. 1683 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:07,559 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:07,559 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:07,560 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:07,560 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:07,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:07,560 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 [2018-10-23 10:06:07,567 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:06:07,568 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:06:07,596 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:06:07,596 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:06:07,598 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:07,618 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 374 proven. 1683 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:07,618 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:08,656 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 374 proven. 1683 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:08,675 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:08,676 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 52 [2018-10-23 10:06:08,676 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:08,676 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-23 10:06:08,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-23 10:06:08,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:08,677 INFO L87 Difference]: Start difference. First operand 123 states and 127 transitions. Second operand 36 states. [2018-10-23 10:06:08,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:08,780 INFO L93 Difference]: Finished difference Result 145 states and 154 transitions. [2018-10-23 10:06:08,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-23 10:06:08,780 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 122 [2018-10-23 10:06:08,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:08,781 INFO L225 Difference]: With dead ends: 145 [2018-10-23 10:06:08,781 INFO L226 Difference]: Without dead ends: 126 [2018-10-23 10:06:08,782 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 211 SyntacticMatches, 18 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 441 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:08,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-10-23 10:06:08,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2018-10-23 10:06:08,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-10-23 10:06:08,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 130 transitions. [2018-10-23 10:06:08,789 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 130 transitions. Word has length 122 [2018-10-23 10:06:08,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:08,790 INFO L481 AbstractCegarLoop]: Abstraction has 126 states and 130 transitions. [2018-10-23 10:06:08,790 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-23 10:06:08,790 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 130 transitions. [2018-10-23 10:06:08,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-23 10:06:08,790 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:08,790 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 34, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:08,790 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:08,791 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:08,791 INFO L82 PathProgramCache]: Analyzing trace with hash 1382015135, now seen corresponding path program 34 times [2018-10-23 10:06:08,791 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:08,791 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:08,791 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:06:08,791 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:08,791 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:08,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:09,731 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 385 proven. 1785 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:09,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:09,731 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:09,731 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:09,732 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:09,732 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:09,732 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 [2018-10-23 10:06:09,739 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:06:09,739 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:06:09,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:09,766 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:09,786 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 385 proven. 1785 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:09,786 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:10,805 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 385 proven. 1785 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:10,825 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:10,825 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 52 [2018-10-23 10:06:10,825 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:10,826 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-23 10:06:10,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-23 10:06:10,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:10,827 INFO L87 Difference]: Start difference. First operand 126 states and 130 transitions. Second operand 37 states. [2018-10-23 10:06:10,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:10,933 INFO L93 Difference]: Finished difference Result 148 states and 157 transitions. [2018-10-23 10:06:10,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-23 10:06:10,934 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 125 [2018-10-23 10:06:10,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:10,936 INFO L225 Difference]: With dead ends: 148 [2018-10-23 10:06:10,936 INFO L226 Difference]: Without dead ends: 129 [2018-10-23 10:06:10,937 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 216 SyntacticMatches, 20 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:10,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-10-23 10:06:10,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2018-10-23 10:06:10,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-10-23 10:06:10,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 133 transitions. [2018-10-23 10:06:10,945 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 133 transitions. Word has length 125 [2018-10-23 10:06:10,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:10,946 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 133 transitions. [2018-10-23 10:06:10,946 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-23 10:06:10,946 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 133 transitions. [2018-10-23 10:06:10,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-10-23 10:06:10,947 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:10,947 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 35, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:10,947 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:10,947 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:10,947 INFO L82 PathProgramCache]: Analyzing trace with hash 1437983834, now seen corresponding path program 35 times [2018-10-23 10:06:10,947 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:10,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:10,948 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:06:10,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:10,948 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:10,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:11,571 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 396 proven. 1890 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:11,571 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:11,571 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:11,571 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:11,571 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:11,571 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:11,571 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 [2018-10-23 10:06:11,578 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:06:11,578 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:06:11,611 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:06:11,611 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:06:11,613 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:11,634 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 396 proven. 1890 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:11,634 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:12,492 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 396 proven. 1890 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:12,522 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:12,522 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 52 [2018-10-23 10:06:12,522 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:12,523 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-23 10:06:12,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-23 10:06:12,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:12,524 INFO L87 Difference]: Start difference. First operand 129 states and 133 transitions. Second operand 38 states. [2018-10-23 10:06:12,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:12,760 INFO L93 Difference]: Finished difference Result 151 states and 160 transitions. [2018-10-23 10:06:12,761 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-23 10:06:12,761 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 128 [2018-10-23 10:06:12,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:12,762 INFO L225 Difference]: With dead ends: 151 [2018-10-23 10:06:12,762 INFO L226 Difference]: Without dead ends: 132 [2018-10-23 10:06:12,763 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 221 SyntacticMatches, 22 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:12,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-10-23 10:06:12,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2018-10-23 10:06:12,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-10-23 10:06:12,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 136 transitions. [2018-10-23 10:06:12,770 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 136 transitions. Word has length 128 [2018-10-23 10:06:12,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:12,770 INFO L481 AbstractCegarLoop]: Abstraction has 132 states and 136 transitions. [2018-10-23 10:06:12,770 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-23 10:06:12,770 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 136 transitions. [2018-10-23 10:06:12,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-10-23 10:06:12,771 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:12,771 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 36, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:12,771 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:12,771 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:12,771 INFO L82 PathProgramCache]: Analyzing trace with hash -1940782401, now seen corresponding path program 36 times [2018-10-23 10:06:12,771 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:12,772 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:12,772 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:06:12,772 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:12,772 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:12,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:13,387 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 407 proven. 1998 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:13,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:13,387 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:13,387 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:13,387 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:13,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:13,388 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 [2018-10-23 10:06:13,397 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:06:13,397 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:06:13,424 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:06:13,424 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:06:13,426 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:13,448 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 407 proven. 1998 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:13,448 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:14,544 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 407 proven. 1998 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:14,574 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:14,574 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 52 [2018-10-23 10:06:14,574 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:14,575 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-23 10:06:14,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-23 10:06:14,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:14,576 INFO L87 Difference]: Start difference. First operand 132 states and 136 transitions. Second operand 39 states. [2018-10-23 10:06:14,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:14,819 INFO L93 Difference]: Finished difference Result 154 states and 163 transitions. [2018-10-23 10:06:14,819 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-23 10:06:14,819 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 131 [2018-10-23 10:06:14,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:14,820 INFO L225 Difference]: With dead ends: 154 [2018-10-23 10:06:14,820 INFO L226 Difference]: Without dead ends: 135 [2018-10-23 10:06:14,821 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 226 SyntacticMatches, 24 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:14,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-10-23 10:06:14,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2018-10-23 10:06:14,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-10-23 10:06:14,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 139 transitions. [2018-10-23 10:06:14,829 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 139 transitions. Word has length 131 [2018-10-23 10:06:14,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:14,830 INFO L481 AbstractCegarLoop]: Abstraction has 135 states and 139 transitions. [2018-10-23 10:06:14,830 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-23 10:06:14,830 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 139 transitions. [2018-10-23 10:06:14,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-23 10:06:14,831 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:14,831 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 37, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:14,831 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:14,831 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:14,832 INFO L82 PathProgramCache]: Analyzing trace with hash -1912140230, now seen corresponding path program 37 times [2018-10-23 10:06:14,832 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:14,832 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:14,832 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:06:14,832 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:14,833 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:14,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:15,474 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 418 proven. 2109 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:15,475 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:15,475 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:15,475 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:15,475 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:15,475 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:15,475 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 10:06:15,482 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:06:15,482 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:06:15,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:15,514 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:15,539 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 418 proven. 2109 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:15,539 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:16,692 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 418 proven. 2109 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:16,714 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:16,714 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 52 [2018-10-23 10:06:16,714 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:16,715 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-23 10:06:16,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-23 10:06:16,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:16,715 INFO L87 Difference]: Start difference. First operand 135 states and 139 transitions. Second operand 40 states. [2018-10-23 10:06:16,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:16,885 INFO L93 Difference]: Finished difference Result 157 states and 166 transitions. [2018-10-23 10:06:16,887 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-23 10:06:16,887 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 134 [2018-10-23 10:06:16,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:16,888 INFO L225 Difference]: With dead ends: 157 [2018-10-23 10:06:16,888 INFO L226 Difference]: Without dead ends: 138 [2018-10-23 10:06:16,888 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 231 SyntacticMatches, 26 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:16,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-10-23 10:06:16,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2018-10-23 10:06:16,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-10-23 10:06:16,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 142 transitions. [2018-10-23 10:06:16,896 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 142 transitions. Word has length 134 [2018-10-23 10:06:16,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:16,897 INFO L481 AbstractCegarLoop]: Abstraction has 138 states and 142 transitions. [2018-10-23 10:06:16,897 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-23 10:06:16,897 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 142 transitions. [2018-10-23 10:06:16,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-10-23 10:06:16,898 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:16,898 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 38, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:16,898 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:16,898 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:16,898 INFO L82 PathProgramCache]: Analyzing trace with hash 963251423, now seen corresponding path program 38 times [2018-10-23 10:06:16,898 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:16,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:16,899 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:06:16,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:16,899 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:16,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:17,589 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 429 proven. 2223 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:17,590 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:17,590 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:17,590 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:17,590 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:17,590 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:17,590 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 [2018-10-23 10:06:17,597 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:06:17,598 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:06:17,649 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:06:17,649 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:06:17,652 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:17,681 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 429 proven. 2223 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:17,681 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:18,714 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 429 proven. 2223 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:18,734 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:18,734 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 52 [2018-10-23 10:06:18,734 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:18,734 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-23 10:06:18,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-23 10:06:18,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:18,735 INFO L87 Difference]: Start difference. First operand 138 states and 142 transitions. Second operand 41 states. [2018-10-23 10:06:18,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:18,925 INFO L93 Difference]: Finished difference Result 160 states and 169 transitions. [2018-10-23 10:06:18,925 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-23 10:06:18,926 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 137 [2018-10-23 10:06:18,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:18,927 INFO L225 Difference]: With dead ends: 160 [2018-10-23 10:06:18,927 INFO L226 Difference]: Without dead ends: 141 [2018-10-23 10:06:18,927 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 236 SyntacticMatches, 28 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 686 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:18,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2018-10-23 10:06:18,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2018-10-23 10:06:18,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-23 10:06:18,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 145 transitions. [2018-10-23 10:06:18,936 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 145 transitions. Word has length 137 [2018-10-23 10:06:18,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:18,936 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 145 transitions. [2018-10-23 10:06:18,936 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-23 10:06:18,936 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 145 transitions. [2018-10-23 10:06:18,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-10-23 10:06:18,937 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:18,937 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 39, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:18,937 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:18,938 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:18,938 INFO L82 PathProgramCache]: Analyzing trace with hash -1366732774, now seen corresponding path program 39 times [2018-10-23 10:06:18,938 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:18,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:18,938 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:06:18,939 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:18,939 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:18,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:20,005 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 440 proven. 2340 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:20,005 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:20,005 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:20,005 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:20,005 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:20,005 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:20,005 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 [2018-10-23 10:06:20,013 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:06:20,013 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:06:20,041 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:06:20,041 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:06:20,044 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:20,070 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 440 proven. 2340 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:20,070 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:21,020 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 440 proven. 2340 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:21,040 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:21,041 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 52 [2018-10-23 10:06:21,041 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:21,041 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-23 10:06:21,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-23 10:06:21,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:21,042 INFO L87 Difference]: Start difference. First operand 141 states and 145 transitions. Second operand 42 states. [2018-10-23 10:06:21,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:21,209 INFO L93 Difference]: Finished difference Result 163 states and 172 transitions. [2018-10-23 10:06:21,209 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-23 10:06:21,209 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 140 [2018-10-23 10:06:21,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:21,210 INFO L225 Difference]: With dead ends: 163 [2018-10-23 10:06:21,210 INFO L226 Difference]: Without dead ends: 144 [2018-10-23 10:06:21,210 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 241 SyntacticMatches, 30 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 735 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:21,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2018-10-23 10:06:21,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 144. [2018-10-23 10:06:21,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-10-23 10:06:21,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 148 transitions. [2018-10-23 10:06:21,219 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 148 transitions. Word has length 140 [2018-10-23 10:06:21,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:21,220 INFO L481 AbstractCegarLoop]: Abstraction has 144 states and 148 transitions. [2018-10-23 10:06:21,220 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-23 10:06:21,220 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 148 transitions. [2018-10-23 10:06:21,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-10-23 10:06:21,221 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:21,221 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 40, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:21,221 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:21,221 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:21,222 INFO L82 PathProgramCache]: Analyzing trace with hash 1335492351, now seen corresponding path program 40 times [2018-10-23 10:06:21,222 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:21,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:21,222 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:06:21,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:21,223 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:21,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:22,147 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 451 proven. 2460 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:22,147 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:22,148 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:22,148 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:22,148 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:22,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:22,148 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 [2018-10-23 10:06:22,155 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:06:22,155 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:06:22,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:22,189 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:22,217 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 451 proven. 2460 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:22,217 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:24,728 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 451 proven. 2460 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:24,749 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:24,749 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 52 [2018-10-23 10:06:24,749 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:24,749 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-23 10:06:24,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-23 10:06:24,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:24,750 INFO L87 Difference]: Start difference. First operand 144 states and 148 transitions. Second operand 43 states. [2018-10-23 10:06:24,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:24,947 INFO L93 Difference]: Finished difference Result 166 states and 175 transitions. [2018-10-23 10:06:24,949 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-23 10:06:24,949 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 143 [2018-10-23 10:06:24,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:24,950 INFO L225 Difference]: With dead ends: 166 [2018-10-23 10:06:24,951 INFO L226 Difference]: Without dead ends: 147 [2018-10-23 10:06:24,951 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 246 SyntacticMatches, 32 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 784 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:24,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-10-23 10:06:24,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2018-10-23 10:06:24,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-10-23 10:06:24,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 151 transitions. [2018-10-23 10:06:24,960 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 151 transitions. Word has length 143 [2018-10-23 10:06:24,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:24,960 INFO L481 AbstractCegarLoop]: Abstraction has 147 states and 151 transitions. [2018-10-23 10:06:24,960 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-23 10:06:24,961 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 151 transitions. [2018-10-23 10:06:24,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-10-23 10:06:24,961 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:24,962 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 41, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:24,962 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:24,962 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:24,962 INFO L82 PathProgramCache]: Analyzing trace with hash -1542804998, now seen corresponding path program 41 times [2018-10-23 10:06:24,962 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:24,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:24,963 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:06:24,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:24,963 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:24,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:25,788 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 462 proven. 2583 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:25,788 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:25,788 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:25,788 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:25,788 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:25,788 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:25,788 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 [2018-10-23 10:06:25,796 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:06:25,796 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:06:25,838 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:06:25,838 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:06:25,841 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:25,866 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 462 proven. 2583 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:25,866 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:26,791 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 462 proven. 2583 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:26,812 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:26,812 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 52 [2018-10-23 10:06:26,812 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:26,813 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-23 10:06:26,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-23 10:06:26,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:26,814 INFO L87 Difference]: Start difference. First operand 147 states and 151 transitions. Second operand 44 states. [2018-10-23 10:06:27,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:27,115 INFO L93 Difference]: Finished difference Result 169 states and 178 transitions. [2018-10-23 10:06:27,115 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-23 10:06:27,115 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 146 [2018-10-23 10:06:27,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:27,117 INFO L225 Difference]: With dead ends: 169 [2018-10-23 10:06:27,118 INFO L226 Difference]: Without dead ends: 150 [2018-10-23 10:06:27,118 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 251 SyntacticMatches, 34 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 833 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:27,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-10-23 10:06:27,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 150. [2018-10-23 10:06:27,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-10-23 10:06:27,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 154 transitions. [2018-10-23 10:06:27,129 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 154 transitions. Word has length 146 [2018-10-23 10:06:27,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:27,130 INFO L481 AbstractCegarLoop]: Abstraction has 150 states and 154 transitions. [2018-10-23 10:06:27,130 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-23 10:06:27,130 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 154 transitions. [2018-10-23 10:06:27,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-10-23 10:06:27,131 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:27,131 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 42, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:27,132 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:27,132 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:27,132 INFO L82 PathProgramCache]: Analyzing trace with hash 122935583, now seen corresponding path program 42 times [2018-10-23 10:06:27,132 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:27,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:27,133 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:06:27,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:27,133 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:27,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:28,154 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 473 proven. 2709 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-23 10:06:28,154 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:28,154 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:28,154 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:28,155 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:28,155 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:28,155 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 [2018-10-23 10:06:28,162 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:06:28,162 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:06:28,192 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:06:28,192 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:06:28,194 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:28,390 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 588 proven. 26 refuted. 0 times theorem prover too weak. 2583 trivial. 0 not checked. [2018-10-23 10:06:28,391 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:28,607 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 588 proven. 26 refuted. 0 times theorem prover too weak. 2583 trivial. 0 not checked. [2018-10-23 10:06:28,627 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:28,627 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 7, 7] total 55 [2018-10-23 10:06:28,627 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:28,627 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-23 10:06:28,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-23 10:06:28,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-23 10:06:28,628 INFO L87 Difference]: Start difference. First operand 150 states and 154 transitions. Second operand 50 states. [2018-10-23 10:06:28,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:28,845 INFO L93 Difference]: Finished difference Result 176 states and 188 transitions. [2018-10-23 10:06:28,845 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-23 10:06:28,846 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 149 [2018-10-23 10:06:28,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:28,848 INFO L225 Difference]: With dead ends: 176 [2018-10-23 10:06:28,848 INFO L226 Difference]: Without dead ends: 157 [2018-10-23 10:06:28,848 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 289 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-23 10:06:28,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-23 10:06:28,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 156. [2018-10-23 10:06:28,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-10-23 10:06:28,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 161 transitions. [2018-10-23 10:06:28,858 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 161 transitions. Word has length 149 [2018-10-23 10:06:28,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:28,858 INFO L481 AbstractCegarLoop]: Abstraction has 156 states and 161 transitions. [2018-10-23 10:06:28,858 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-23 10:06:28,859 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 161 transitions. [2018-10-23 10:06:28,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-10-23 10:06:28,859 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:28,860 INFO L375 BasicCegarLoop]: trace histogram [49, 48, 43, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:28,860 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:28,860 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:28,860 INFO L82 PathProgramCache]: Analyzing trace with hash -1763811647, now seen corresponding path program 43 times [2018-10-23 10:06:28,860 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:28,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:28,861 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:06:28,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:28,861 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:28,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:30,004 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 616 proven. 2838 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:30,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:30,004 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:30,005 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:30,005 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:30,005 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:30,005 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 [2018-10-23 10:06:30,012 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:06:30,013 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:06:30,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:30,049 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:30,080 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 616 proven. 2838 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:30,080 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:31,174 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 616 proven. 2838 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:31,195 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:31,195 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 52 [2018-10-23 10:06:31,196 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:31,196 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-23 10:06:31,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-23 10:06:31,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:31,197 INFO L87 Difference]: Start difference. First operand 156 states and 161 transitions. Second operand 46 states. [2018-10-23 10:06:31,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:31,344 INFO L93 Difference]: Finished difference Result 181 states and 192 transitions. [2018-10-23 10:06:31,345 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-23 10:06:31,345 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 155 [2018-10-23 10:06:31,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:31,346 INFO L225 Difference]: With dead ends: 181 [2018-10-23 10:06:31,346 INFO L226 Difference]: Without dead ends: 159 [2018-10-23 10:06:31,347 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 267 SyntacticMatches, 38 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 931 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:31,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2018-10-23 10:06:31,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2018-10-23 10:06:31,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-10-23 10:06:31,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 164 transitions. [2018-10-23 10:06:31,355 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 164 transitions. Word has length 155 [2018-10-23 10:06:31,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:31,355 INFO L481 AbstractCegarLoop]: Abstraction has 159 states and 164 transitions. [2018-10-23 10:06:31,356 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-23 10:06:31,356 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 164 transitions. [2018-10-23 10:06:31,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-10-23 10:06:31,356 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:31,356 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 44, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:31,357 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:31,357 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:31,357 INFO L82 PathProgramCache]: Analyzing trace with hash -1609078468, now seen corresponding path program 44 times [2018-10-23 10:06:31,357 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:31,357 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:31,357 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:06:31,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:31,358 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:31,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:32,416 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 630 proven. 2970 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:32,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:32,417 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:32,417 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:32,417 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:32,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:32,417 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 [2018-10-23 10:06:32,429 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:06:32,429 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:06:32,464 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:06:32,464 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:06:32,466 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:32,487 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 630 proven. 2970 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:32,487 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:33,382 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 630 proven. 2970 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:33,402 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:33,402 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 52 [2018-10-23 10:06:33,403 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:33,403 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-23 10:06:33,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-23 10:06:33,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:33,404 INFO L87 Difference]: Start difference. First operand 159 states and 164 transitions. Second operand 47 states. [2018-10-23 10:06:33,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:33,602 INFO L93 Difference]: Finished difference Result 184 states and 195 transitions. [2018-10-23 10:06:33,602 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-23 10:06:33,602 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 158 [2018-10-23 10:06:33,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:33,604 INFO L225 Difference]: With dead ends: 184 [2018-10-23 10:06:33,604 INFO L226 Difference]: Without dead ends: 162 [2018-10-23 10:06:33,604 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 272 SyntacticMatches, 40 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 980 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:33,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2018-10-23 10:06:33,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 162. [2018-10-23 10:06:33,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-10-23 10:06:33,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 167 transitions. [2018-10-23 10:06:33,613 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 167 transitions. Word has length 158 [2018-10-23 10:06:33,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:33,614 INFO L481 AbstractCegarLoop]: Abstraction has 162 states and 167 transitions. [2018-10-23 10:06:33,614 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-23 10:06:33,614 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 167 transitions. [2018-10-23 10:06:33,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-10-23 10:06:33,615 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:33,615 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 45, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:33,615 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:33,615 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:33,615 INFO L82 PathProgramCache]: Analyzing trace with hash -452851487, now seen corresponding path program 45 times [2018-10-23 10:06:33,616 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:33,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:33,616 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:06:33,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:33,616 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:33,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:35,594 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 644 proven. 3105 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:35,594 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:35,594 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:35,595 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:35,595 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:35,595 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:35,595 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 [2018-10-23 10:06:35,604 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:06:35,604 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:06:35,639 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:06:35,639 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:06:35,642 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:35,665 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 644 proven. 3105 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:35,665 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:36,560 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 644 proven. 3105 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:36,580 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:36,580 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 52 [2018-10-23 10:06:36,580 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:36,581 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-23 10:06:36,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-23 10:06:36,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:36,581 INFO L87 Difference]: Start difference. First operand 162 states and 167 transitions. Second operand 48 states. [2018-10-23 10:06:36,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:36,773 INFO L93 Difference]: Finished difference Result 187 states and 198 transitions. [2018-10-23 10:06:36,773 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-23 10:06:36,773 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 161 [2018-10-23 10:06:36,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:36,774 INFO L225 Difference]: With dead ends: 187 [2018-10-23 10:06:36,774 INFO L226 Difference]: Without dead ends: 165 [2018-10-23 10:06:36,775 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 369 GetRequests, 277 SyntacticMatches, 42 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1029 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:36,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2018-10-23 10:06:36,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 165. [2018-10-23 10:06:36,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-10-23 10:06:36,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 170 transitions. [2018-10-23 10:06:36,782 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 170 transitions. Word has length 161 [2018-10-23 10:06:36,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:36,783 INFO L481 AbstractCegarLoop]: Abstraction has 165 states and 170 transitions. [2018-10-23 10:06:36,783 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-23 10:06:36,783 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 170 transitions. [2018-10-23 10:06:36,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-10-23 10:06:36,783 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:36,784 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 46, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:36,784 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:36,784 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:36,784 INFO L82 PathProgramCache]: Analyzing trace with hash -932574436, now seen corresponding path program 46 times [2018-10-23 10:06:36,784 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:36,784 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:36,785 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:06:36,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:36,785 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:36,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:37,935 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 658 proven. 3243 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:37,936 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:37,936 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:37,936 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:37,936 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:37,936 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:37,936 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 [2018-10-23 10:06:37,944 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:06:37,944 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:06:37,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:37,984 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:38,017 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 658 proven. 3243 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:38,017 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:39,063 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 658 proven. 3243 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:39,083 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:39,084 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 52 [2018-10-23 10:06:39,084 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:39,084 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-23 10:06:39,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-23 10:06:39,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:39,085 INFO L87 Difference]: Start difference. First operand 165 states and 170 transitions. Second operand 49 states. [2018-10-23 10:06:39,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:39,291 INFO L93 Difference]: Finished difference Result 190 states and 201 transitions. [2018-10-23 10:06:39,291 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-23 10:06:39,291 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 164 [2018-10-23 10:06:39,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:39,292 INFO L225 Difference]: With dead ends: 190 [2018-10-23 10:06:39,292 INFO L226 Difference]: Without dead ends: 168 [2018-10-23 10:06:39,293 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 282 SyntacticMatches, 44 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1078 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:39,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2018-10-23 10:06:39,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2018-10-23 10:06:39,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-10-23 10:06:39,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 173 transitions. [2018-10-23 10:06:39,302 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 173 transitions. Word has length 164 [2018-10-23 10:06:39,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:39,302 INFO L481 AbstractCegarLoop]: Abstraction has 168 states and 173 transitions. [2018-10-23 10:06:39,302 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-23 10:06:39,302 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 173 transitions. [2018-10-23 10:06:39,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-10-23 10:06:39,303 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:39,303 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 47, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:39,303 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:39,303 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:39,303 INFO L82 PathProgramCache]: Analyzing trace with hash 1292212993, now seen corresponding path program 47 times [2018-10-23 10:06:39,303 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:39,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:39,304 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:06:39,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:39,304 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:39,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:41,053 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 672 proven. 3384 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:41,053 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:41,054 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:41,054 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:41,054 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:41,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:41,054 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 10:06:41,061 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:06:41,061 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:06:41,097 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:06:41,097 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:06:41,100 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:41,133 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 672 proven. 3384 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:41,134 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:42,125 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 672 proven. 3384 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:42,158 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:42,159 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 52 [2018-10-23 10:06:42,159 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:42,159 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-23 10:06:42,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-23 10:06:42,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:42,160 INFO L87 Difference]: Start difference. First operand 168 states and 173 transitions. Second operand 50 states. [2018-10-23 10:06:42,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:42,431 INFO L93 Difference]: Finished difference Result 193 states and 204 transitions. [2018-10-23 10:06:42,431 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-23 10:06:42,432 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 167 [2018-10-23 10:06:42,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:42,433 INFO L225 Difference]: With dead ends: 193 [2018-10-23 10:06:42,433 INFO L226 Difference]: Without dead ends: 171 [2018-10-23 10:06:42,433 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 287 SyntacticMatches, 46 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1127 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:42,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2018-10-23 10:06:42,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 171. [2018-10-23 10:06:42,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-10-23 10:06:42,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 176 transitions. [2018-10-23 10:06:42,440 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 176 transitions. Word has length 167 [2018-10-23 10:06:42,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:42,440 INFO L481 AbstractCegarLoop]: Abstraction has 171 states and 176 transitions. [2018-10-23 10:06:42,441 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-23 10:06:42,441 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 176 transitions. [2018-10-23 10:06:42,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-10-23 10:06:42,441 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:42,441 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 48, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:42,442 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:42,442 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:42,442 INFO L82 PathProgramCache]: Analyzing trace with hash -801540, now seen corresponding path program 48 times [2018-10-23 10:06:42,442 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:42,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:42,442 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:06:42,443 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:42,443 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:42,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:44,245 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 686 proven. 3528 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:44,245 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:44,245 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:44,245 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:44,245 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:44,246 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:44,246 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 [2018-10-23 10:06:44,253 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:06:44,253 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:06:44,290 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:06:44,291 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:06:44,293 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:44,329 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 686 proven. 3528 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:44,329 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:45,979 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 686 proven. 3528 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:45,999 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:45,999 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 52 [2018-10-23 10:06:45,999 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:45,999 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-23 10:06:46,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-23 10:06:46,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:46,000 INFO L87 Difference]: Start difference. First operand 171 states and 176 transitions. Second operand 51 states. [2018-10-23 10:06:46,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:46,210 INFO L93 Difference]: Finished difference Result 196 states and 207 transitions. [2018-10-23 10:06:46,210 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-23 10:06:46,210 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 170 [2018-10-23 10:06:46,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:46,212 INFO L225 Difference]: With dead ends: 196 [2018-10-23 10:06:46,212 INFO L226 Difference]: Without dead ends: 174 [2018-10-23 10:06:46,213 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 292 SyntacticMatches, 48 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1176 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:46,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2018-10-23 10:06:46,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 174. [2018-10-23 10:06:46,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-10-23 10:06:46,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 179 transitions. [2018-10-23 10:06:46,221 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 179 transitions. Word has length 170 [2018-10-23 10:06:46,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:46,221 INFO L481 AbstractCegarLoop]: Abstraction has 174 states and 179 transitions. [2018-10-23 10:06:46,221 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-23 10:06:46,222 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 179 transitions. [2018-10-23 10:06:46,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-10-23 10:06:46,222 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:46,223 INFO L375 BasicCegarLoop]: trace histogram [55, 54, 49, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:46,223 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:46,223 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:46,223 INFO L82 PathProgramCache]: Analyzing trace with hash 1364923681, now seen corresponding path program 49 times [2018-10-23 10:06:46,223 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:46,224 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:46,224 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:06:46,224 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:46,224 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:46,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:47,493 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 700 proven. 3675 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:47,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:47,493 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:47,493 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:47,493 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:47,494 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:47,494 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 [2018-10-23 10:06:47,501 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:06:47,501 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:06:47,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:47,539 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:47,565 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 700 proven. 3675 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:47,566 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:48,960 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 700 proven. 3675 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-23 10:06:48,979 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:48,980 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 52 [2018-10-23 10:06:48,980 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:48,980 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-23 10:06:48,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-23 10:06:48,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:48,981 INFO L87 Difference]: Start difference. First operand 174 states and 179 transitions. Second operand 52 states. [2018-10-23 10:06:49,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:49,193 INFO L93 Difference]: Finished difference Result 199 states and 210 transitions. [2018-10-23 10:06:49,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-23 10:06:49,193 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 173 [2018-10-23 10:06:49,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:49,194 INFO L225 Difference]: With dead ends: 199 [2018-10-23 10:06:49,194 INFO L226 Difference]: Without dead ends: 177 [2018-10-23 10:06:49,195 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 297 SyntacticMatches, 50 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1225 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:06:49,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-10-23 10:06:49,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 177. [2018-10-23 10:06:49,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-10-23 10:06:49,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 182 transitions. [2018-10-23 10:06:49,217 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 182 transitions. Word has length 173 [2018-10-23 10:06:49,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:49,218 INFO L481 AbstractCegarLoop]: Abstraction has 177 states and 182 transitions. [2018-10-23 10:06:49,218 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-23 10:06:49,218 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 182 transitions. [2018-10-23 10:06:49,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-10-23 10:06:49,219 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:49,219 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 50, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:49,219 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:49,219 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:49,219 INFO L82 PathProgramCache]: Analyzing trace with hash 1459787484, now seen corresponding path program 50 times [2018-10-23 10:06:49,219 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:49,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:49,220 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:06:49,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:49,220 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:49,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:50,273 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 1104 proven. 77 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-23 10:06:50,274 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:50,274 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:50,274 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:50,274 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:50,274 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:50,274 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 [2018-10-23 10:06:50,292 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:06:50,292 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:06:50,346 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:06:50,346 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:06:50,350 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:06:54,561 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:06:54,561 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:06:56,399 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:06:56,419 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:06:56,420 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 58, 58] total 102 [2018-10-23 10:06:56,420 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:06:56,420 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-23 10:06:56,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-23 10:06:56,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:06:56,422 INFO L87 Difference]: Start difference. First operand 177 states and 182 transitions. Second operand 60 states. [2018-10-23 10:06:56,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:06:56,669 INFO L93 Difference]: Finished difference Result 192 states and 203 transitions. [2018-10-23 10:06:56,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-10-23 10:06:56,669 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 176 [2018-10-23 10:06:56,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:06:56,671 INFO L225 Difference]: With dead ends: 192 [2018-10-23 10:06:56,671 INFO L226 Difference]: Without dead ends: 187 [2018-10-23 10:06:56,672 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 247 SyntacticMatches, 14 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6617 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:06:56,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-23 10:06:56,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 186. [2018-10-23 10:06:56,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-10-23 10:06:56,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 194 transitions. [2018-10-23 10:06:56,680 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 194 transitions. Word has length 176 [2018-10-23 10:06:56,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:06:56,680 INFO L481 AbstractCegarLoop]: Abstraction has 186 states and 194 transitions. [2018-10-23 10:06:56,680 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-23 10:06:56,680 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 194 transitions. [2018-10-23 10:06:56,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-10-23 10:06:56,681 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:06:56,682 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 50, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:06:56,682 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:06:56,682 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:06:56,682 INFO L82 PathProgramCache]: Analyzing trace with hash -1135485089, now seen corresponding path program 51 times [2018-10-23 10:06:56,682 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:06:56,683 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:56,683 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:06:56,683 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:06:56,683 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:06:56,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:06:58,412 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 1536 proven. 155 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-23 10:06:58,412 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:58,412 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:06:58,413 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:06:58,413 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:06:58,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:06:58,413 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 [2018-10-23 10:06:58,429 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:06:58,429 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:06:58,485 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:06:58,485 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:06:58,489 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:07:01,476 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:01,477 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:07:02,731 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:02,751 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:07:02,752 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 61, 61] total 102 [2018-10-23 10:07:02,752 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:07:02,752 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-10-23 10:07:02,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-10-23 10:07:02,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:02,753 INFO L87 Difference]: Start difference. First operand 186 states and 194 transitions. Second operand 63 states. [2018-10-23 10:07:03,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:07:03,092 INFO L93 Difference]: Finished difference Result 201 states and 215 transitions. [2018-10-23 10:07:03,094 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-23 10:07:03,094 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 185 [2018-10-23 10:07:03,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:07:03,096 INFO L225 Difference]: With dead ends: 201 [2018-10-23 10:07:03,096 INFO L226 Difference]: Without dead ends: 196 [2018-10-23 10:07:03,099 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 262 SyntacticMatches, 20 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7352 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:03,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-10-23 10:07:03,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 195. [2018-10-23 10:07:03,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2018-10-23 10:07:03,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 206 transitions. [2018-10-23 10:07:03,109 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 206 transitions. Word has length 185 [2018-10-23 10:07:03,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:07:03,109 INFO L481 AbstractCegarLoop]: Abstraction has 195 states and 206 transitions. [2018-10-23 10:07:03,109 INFO L482 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-10-23 10:07:03,109 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 206 transitions. [2018-10-23 10:07:03,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-10-23 10:07:03,110 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:07:03,111 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 50, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:07:03,111 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:07:03,111 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:07:03,111 INFO L82 PathProgramCache]: Analyzing trace with hash -1991738820, now seen corresponding path program 52 times [2018-10-23 10:07:03,111 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:07:03,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:03,112 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:07:03,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:03,112 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:07:03,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:07:03,343 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 1968 proven. 260 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-23 10:07:03,343 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:03,343 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:07:03,343 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:07:03,343 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:07:03,343 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:03,343 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 [2018-10-23 10:07:03,352 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:07:03,352 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:07:03,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:07:03,399 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:07:04,394 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:04,394 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:07:06,046 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:06,066 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:07:06,066 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 64, 64] total 102 [2018-10-23 10:07:06,066 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:07:06,067 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-10-23 10:07:06,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-10-23 10:07:06,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:06,068 INFO L87 Difference]: Start difference. First operand 195 states and 206 transitions. Second operand 66 states. [2018-10-23 10:07:06,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:07:06,572 INFO L93 Difference]: Finished difference Result 210 states and 227 transitions. [2018-10-23 10:07:06,573 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-10-23 10:07:06,573 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 194 [2018-10-23 10:07:06,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:07:06,574 INFO L225 Difference]: With dead ends: 210 [2018-10-23 10:07:06,574 INFO L226 Difference]: Without dead ends: 205 [2018-10-23 10:07:06,575 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 277 SyntacticMatches, 26 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8087 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:06,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-10-23 10:07:06,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 204. [2018-10-23 10:07:06,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2018-10-23 10:07:06,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 218 transitions. [2018-10-23 10:07:06,586 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 218 transitions. Word has length 194 [2018-10-23 10:07:06,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:07:06,586 INFO L481 AbstractCegarLoop]: Abstraction has 204 states and 218 transitions. [2018-10-23 10:07:06,586 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-10-23 10:07:06,586 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 218 transitions. [2018-10-23 10:07:06,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2018-10-23 10:07:06,588 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:07:06,588 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 50, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:07:06,588 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:07:06,588 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:07:06,588 INFO L82 PathProgramCache]: Analyzing trace with hash 42321919, now seen corresponding path program 53 times [2018-10-23 10:07:06,588 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:07:06,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:06,589 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:07:06,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:06,590 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:07:06,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:07:10,317 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 2400 proven. 392 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-23 10:07:10,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:10,318 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:07:10,318 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:07:10,318 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:07:10,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:10,318 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) [2018-10-23 10:07:10,334 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:07:10,334 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:07:10,395 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:07:10,395 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:07:10,399 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:07:11,500 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:11,501 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:07:12,954 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:12,974 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:07:12,974 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 67, 67] total 102 [2018-10-23 10:07:12,974 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:07:12,975 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-10-23 10:07:12,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-10-23 10:07:12,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:12,977 INFO L87 Difference]: Start difference. First operand 204 states and 218 transitions. Second operand 69 states. [2018-10-23 10:07:13,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:07:13,538 INFO L93 Difference]: Finished difference Result 219 states and 239 transitions. [2018-10-23 10:07:13,539 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-23 10:07:13,539 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 203 [2018-10-23 10:07:13,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:07:13,540 INFO L225 Difference]: With dead ends: 219 [2018-10-23 10:07:13,540 INFO L226 Difference]: Without dead ends: 214 [2018-10-23 10:07:13,541 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 424 GetRequests, 292 SyntacticMatches, 32 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8822 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:13,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-10-23 10:07:13,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 213. [2018-10-23 10:07:13,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2018-10-23 10:07:13,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 230 transitions. [2018-10-23 10:07:13,549 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 230 transitions. Word has length 203 [2018-10-23 10:07:13,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:07:13,549 INFO L481 AbstractCegarLoop]: Abstraction has 213 states and 230 transitions. [2018-10-23 10:07:13,549 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-10-23 10:07:13,549 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 230 transitions. [2018-10-23 10:07:13,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2018-10-23 10:07:13,550 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:07:13,551 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 50, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:07:13,551 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:07:13,551 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:07:13,551 INFO L82 PathProgramCache]: Analyzing trace with hash -924826212, now seen corresponding path program 54 times [2018-10-23 10:07:13,551 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:07:13,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:13,552 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:07:13,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:13,552 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:07:13,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:07:14,298 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 2832 proven. 551 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-23 10:07:14,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:14,298 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:07:14,298 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:07:14,298 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:07:14,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:14,299 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 [2018-10-23 10:07:14,306 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:07:14,306 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:07:14,353 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:07:14,354 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:07:14,357 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:07:15,400 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:15,400 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:07:17,193 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:17,214 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:07:17,214 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 70, 70] total 102 [2018-10-23 10:07:17,214 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:07:17,214 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-10-23 10:07:17,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-10-23 10:07:17,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:17,216 INFO L87 Difference]: Start difference. First operand 213 states and 230 transitions. Second operand 72 states. [2018-10-23 10:07:17,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:07:17,737 INFO L93 Difference]: Finished difference Result 228 states and 251 transitions. [2018-10-23 10:07:17,738 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-10-23 10:07:17,738 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 212 [2018-10-23 10:07:17,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:07:17,739 INFO L225 Difference]: With dead ends: 228 [2018-10-23 10:07:17,740 INFO L226 Difference]: Without dead ends: 223 [2018-10-23 10:07:17,741 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 307 SyntacticMatches, 38 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9557 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:17,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-10-23 10:07:17,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 222. [2018-10-23 10:07:17,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2018-10-23 10:07:17,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 242 transitions. [2018-10-23 10:07:17,750 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 242 transitions. Word has length 212 [2018-10-23 10:07:17,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:07:17,751 INFO L481 AbstractCegarLoop]: Abstraction has 222 states and 242 transitions. [2018-10-23 10:07:17,751 INFO L482 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-10-23 10:07:17,751 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 242 transitions. [2018-10-23 10:07:17,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2018-10-23 10:07:17,752 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:07:17,752 INFO L375 BasicCegarLoop]: trace histogram [71, 70, 50, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:07:17,752 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:07:17,753 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:07:17,753 INFO L82 PathProgramCache]: Analyzing trace with hash 890030239, now seen corresponding path program 55 times [2018-10-23 10:07:17,753 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:07:17,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:17,753 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:07:17,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:17,754 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:07:17,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:07:18,685 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 3264 proven. 737 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-23 10:07:18,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:18,685 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:07:18,685 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:07:18,685 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:07:18,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:18,685 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 [2018-10-23 10:07:18,693 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:07:18,693 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:07:18,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:07:18,747 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:07:20,312 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:20,312 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:07:22,173 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:22,193 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:07:22,193 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 73, 73] total 102 [2018-10-23 10:07:22,193 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:07:22,194 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-10-23 10:07:22,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-10-23 10:07:22,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:22,195 INFO L87 Difference]: Start difference. First operand 222 states and 242 transitions. Second operand 75 states. [2018-10-23 10:07:22,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:07:22,895 INFO L93 Difference]: Finished difference Result 237 states and 263 transitions. [2018-10-23 10:07:22,895 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-10-23 10:07:22,895 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 221 [2018-10-23 10:07:22,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:07:22,897 INFO L225 Difference]: With dead ends: 237 [2018-10-23 10:07:22,897 INFO L226 Difference]: Without dead ends: 232 [2018-10-23 10:07:22,897 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 322 SyntacticMatches, 44 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10292 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:22,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2018-10-23 10:07:22,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 231. [2018-10-23 10:07:22,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 231 states. [2018-10-23 10:07:22,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 254 transitions. [2018-10-23 10:07:22,908 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 254 transitions. Word has length 221 [2018-10-23 10:07:22,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:07:22,908 INFO L481 AbstractCegarLoop]: Abstraction has 231 states and 254 transitions. [2018-10-23 10:07:22,908 INFO L482 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-10-23 10:07:22,908 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 254 transitions. [2018-10-23 10:07:22,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2018-10-23 10:07:22,909 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:07:22,910 INFO L375 BasicCegarLoop]: trace histogram [74, 73, 50, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:07:22,910 INFO L424 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:07:22,910 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:07:22,910 INFO L82 PathProgramCache]: Analyzing trace with hash 740292860, now seen corresponding path program 56 times [2018-10-23 10:07:22,910 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:07:22,911 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:22,911 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:07:22,911 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:22,911 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:07:22,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:07:23,471 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 3696 proven. 950 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-23 10:07:23,472 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:23,472 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:07:23,472 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:07:23,472 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:07:23,472 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:23,472 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:07:23,479 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:07:23,479 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:07:23,538 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:07:23,538 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:07:23,543 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:07:24,886 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:24,887 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:07:26,726 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:26,747 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:07:26,747 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 76, 76] total 102 [2018-10-23 10:07:26,747 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:07:26,747 INFO L460 AbstractCegarLoop]: Interpolant automaton has 78 states [2018-10-23 10:07:26,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2018-10-23 10:07:26,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:26,749 INFO L87 Difference]: Start difference. First operand 231 states and 254 transitions. Second operand 78 states. [2018-10-23 10:07:27,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:07:27,463 INFO L93 Difference]: Finished difference Result 246 states and 275 transitions. [2018-10-23 10:07:27,463 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2018-10-23 10:07:27,463 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 230 [2018-10-23 10:07:27,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:07:27,465 INFO L225 Difference]: With dead ends: 246 [2018-10-23 10:07:27,465 INFO L226 Difference]: Without dead ends: 241 [2018-10-23 10:07:27,465 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 337 SyntacticMatches, 50 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11027 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:27,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2018-10-23 10:07:27,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 240. [2018-10-23 10:07:27,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2018-10-23 10:07:27,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 266 transitions. [2018-10-23 10:07:27,475 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 266 transitions. Word has length 230 [2018-10-23 10:07:27,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:07:27,476 INFO L481 AbstractCegarLoop]: Abstraction has 240 states and 266 transitions. [2018-10-23 10:07:27,476 INFO L482 AbstractCegarLoop]: Interpolant automaton has 78 states. [2018-10-23 10:07:27,476 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 266 transitions. [2018-10-23 10:07:27,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 240 [2018-10-23 10:07:27,477 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:07:27,477 INFO L375 BasicCegarLoop]: trace histogram [77, 76, 50, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:07:27,477 INFO L424 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:07:27,478 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:07:27,478 INFO L82 PathProgramCache]: Analyzing trace with hash -28253889, now seen corresponding path program 57 times [2018-10-23 10:07:27,478 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:07:27,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:27,479 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:07:27,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:27,479 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:07:27,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:07:27,935 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 4128 proven. 1190 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-23 10:07:27,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:27,935 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:07:27,935 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:07:27,935 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:07:27,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:27,935 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:07:27,945 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:07:27,945 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:07:28,011 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:07:28,011 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:07:28,015 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:07:29,027 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 0 proven. 8702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:29,028 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:07:30,664 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 0 proven. 8702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:30,685 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:07:30,686 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 79, 79] total 102 [2018-10-23 10:07:30,686 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:07:30,686 INFO L460 AbstractCegarLoop]: Interpolant automaton has 81 states [2018-10-23 10:07:30,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2018-10-23 10:07:30,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:30,688 INFO L87 Difference]: Start difference. First operand 240 states and 266 transitions. Second operand 81 states. [2018-10-23 10:07:31,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:07:31,324 INFO L93 Difference]: Finished difference Result 255 states and 287 transitions. [2018-10-23 10:07:31,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-10-23 10:07:31,325 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 239 [2018-10-23 10:07:31,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:07:31,326 INFO L225 Difference]: With dead ends: 255 [2018-10-23 10:07:31,326 INFO L226 Difference]: Without dead ends: 250 [2018-10-23 10:07:31,327 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 508 GetRequests, 352 SyntacticMatches, 56 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11762 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:31,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2018-10-23 10:07:31,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 249. [2018-10-23 10:07:31,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 249 states. [2018-10-23 10:07:31,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 278 transitions. [2018-10-23 10:07:31,337 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 278 transitions. Word has length 239 [2018-10-23 10:07:31,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:07:31,337 INFO L481 AbstractCegarLoop]: Abstraction has 249 states and 278 transitions. [2018-10-23 10:07:31,337 INFO L482 AbstractCegarLoop]: Interpolant automaton has 81 states. [2018-10-23 10:07:31,337 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 278 transitions. [2018-10-23 10:07:31,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2018-10-23 10:07:31,339 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:07:31,339 INFO L375 BasicCegarLoop]: trace histogram [80, 79, 50, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:07:31,339 INFO L424 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:07:31,339 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:07:31,339 INFO L82 PathProgramCache]: Analyzing trace with hash 534615132, now seen corresponding path program 58 times [2018-10-23 10:07:31,339 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:07:31,340 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:31,340 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:07:31,340 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:31,340 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:07:31,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:07:31,892 INFO L134 CoverageAnalysis]: Checked inductivity of 9401 backedges. 4560 proven. 1457 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-23 10:07:31,893 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:31,893 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:07:31,893 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:07:31,893 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:07:31,893 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:31,893 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:07:31,900 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:07:31,900 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:07:31,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:07:31,960 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:07:34,164 INFO L134 CoverageAnalysis]: Checked inductivity of 9401 backedges. 0 proven. 9401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:34,164 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:07:35,826 INFO L134 CoverageAnalysis]: Checked inductivity of 9401 backedges. 0 proven. 9401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:35,847 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:07:35,847 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 82, 82] total 102 [2018-10-23 10:07:35,848 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:07:35,848 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2018-10-23 10:07:35,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2018-10-23 10:07:35,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:35,849 INFO L87 Difference]: Start difference. First operand 249 states and 278 transitions. Second operand 84 states. [2018-10-23 10:07:36,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:07:36,617 INFO L93 Difference]: Finished difference Result 264 states and 299 transitions. [2018-10-23 10:07:36,617 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2018-10-23 10:07:36,617 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 248 [2018-10-23 10:07:36,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:07:36,619 INFO L225 Difference]: With dead ends: 264 [2018-10-23 10:07:36,619 INFO L226 Difference]: Without dead ends: 259 [2018-10-23 10:07:36,620 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 529 GetRequests, 367 SyntacticMatches, 62 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12497 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:36,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2018-10-23 10:07:36,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 258. [2018-10-23 10:07:36,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 258 states. [2018-10-23 10:07:36,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 290 transitions. [2018-10-23 10:07:36,626 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 290 transitions. Word has length 248 [2018-10-23 10:07:36,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:07:36,626 INFO L481 AbstractCegarLoop]: Abstraction has 258 states and 290 transitions. [2018-10-23 10:07:36,627 INFO L482 AbstractCegarLoop]: Interpolant automaton has 84 states. [2018-10-23 10:07:36,627 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 290 transitions. [2018-10-23 10:07:36,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2018-10-23 10:07:36,628 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:07:36,628 INFO L375 BasicCegarLoop]: trace histogram [83, 82, 50, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:07:36,628 INFO L424 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:07:36,628 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:07:36,629 INFO L82 PathProgramCache]: Analyzing trace with hash 37491167, now seen corresponding path program 59 times [2018-10-23 10:07:36,629 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:07:36,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:36,629 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:07:36,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:36,630 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:07:36,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:07:37,278 INFO L134 CoverageAnalysis]: Checked inductivity of 10127 backedges. 4992 proven. 1751 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-23 10:07:37,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:37,279 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:07:37,279 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:07:37,279 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:07:37,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:37,279 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:07:37,288 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:07:37,288 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:07:37,347 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:07:37,348 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:07:37,351 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:07:38,377 INFO L134 CoverageAnalysis]: Checked inductivity of 10127 backedges. 0 proven. 10127 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:38,377 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:07:40,105 INFO L134 CoverageAnalysis]: Checked inductivity of 10127 backedges. 0 proven. 10127 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:40,126 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:07:40,126 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 85, 85] total 102 [2018-10-23 10:07:40,126 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:07:40,127 INFO L460 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-10-23 10:07:40,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-10-23 10:07:40,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:40,128 INFO L87 Difference]: Start difference. First operand 258 states and 290 transitions. Second operand 87 states. [2018-10-23 10:07:40,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:07:40,920 INFO L93 Difference]: Finished difference Result 273 states and 311 transitions. [2018-10-23 10:07:40,920 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2018-10-23 10:07:40,921 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 257 [2018-10-23 10:07:40,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:07:40,922 INFO L225 Difference]: With dead ends: 273 [2018-10-23 10:07:40,922 INFO L226 Difference]: Without dead ends: 268 [2018-10-23 10:07:40,923 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 550 GetRequests, 382 SyntacticMatches, 68 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13232 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:40,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2018-10-23 10:07:40,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 267. [2018-10-23 10:07:40,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 267 states. [2018-10-23 10:07:40,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 302 transitions. [2018-10-23 10:07:40,930 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 302 transitions. Word has length 257 [2018-10-23 10:07:40,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:07:40,931 INFO L481 AbstractCegarLoop]: Abstraction has 267 states and 302 transitions. [2018-10-23 10:07:40,931 INFO L482 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-10-23 10:07:40,931 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 302 transitions. [2018-10-23 10:07:40,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2018-10-23 10:07:40,932 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:07:40,932 INFO L375 BasicCegarLoop]: trace histogram [86, 85, 50, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:07:40,933 INFO L424 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:07:40,933 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:07:40,933 INFO L82 PathProgramCache]: Analyzing trace with hash -949020740, now seen corresponding path program 60 times [2018-10-23 10:07:40,933 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:07:40,933 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:40,934 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:07:40,934 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:40,934 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:07:40,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:07:41,989 INFO L134 CoverageAnalysis]: Checked inductivity of 10880 backedges. 5424 proven. 2072 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-23 10:07:41,989 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:41,989 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:07:41,989 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:07:41,990 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:07:41,990 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:41,990 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:07:41,998 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:07:41,998 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:07:42,061 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:07:42,061 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:07:42,065 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:07:43,084 INFO L134 CoverageAnalysis]: Checked inductivity of 10880 backedges. 0 proven. 10880 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:43,084 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:07:44,908 INFO L134 CoverageAnalysis]: Checked inductivity of 10880 backedges. 0 proven. 10880 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:44,928 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:07:44,928 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 88, 88] total 102 [2018-10-23 10:07:44,928 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:07:44,929 INFO L460 AbstractCegarLoop]: Interpolant automaton has 90 states [2018-10-23 10:07:44,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2018-10-23 10:07:44,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:44,930 INFO L87 Difference]: Start difference. First operand 267 states and 302 transitions. Second operand 90 states. [2018-10-23 10:07:45,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:07:45,701 INFO L93 Difference]: Finished difference Result 282 states and 323 transitions. [2018-10-23 10:07:45,701 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2018-10-23 10:07:45,701 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 266 [2018-10-23 10:07:45,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:07:45,703 INFO L225 Difference]: With dead ends: 282 [2018-10-23 10:07:45,703 INFO L226 Difference]: Without dead ends: 277 [2018-10-23 10:07:45,704 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 397 SyntacticMatches, 74 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13967 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:45,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2018-10-23 10:07:45,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 276. [2018-10-23 10:07:45,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 276 states. [2018-10-23 10:07:45,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 314 transitions. [2018-10-23 10:07:45,714 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 314 transitions. Word has length 266 [2018-10-23 10:07:45,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:07:45,714 INFO L481 AbstractCegarLoop]: Abstraction has 276 states and 314 transitions. [2018-10-23 10:07:45,714 INFO L482 AbstractCegarLoop]: Interpolant automaton has 90 states. [2018-10-23 10:07:45,714 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 314 transitions. [2018-10-23 10:07:45,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-10-23 10:07:45,716 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:07:45,716 INFO L375 BasicCegarLoop]: trace histogram [89, 88, 50, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:07:45,716 INFO L424 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:07:45,716 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:07:45,716 INFO L82 PathProgramCache]: Analyzing trace with hash 2117622399, now seen corresponding path program 61 times [2018-10-23 10:07:45,717 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:07:45,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:45,717 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:07:45,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:45,717 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:07:45,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:07:46,794 INFO L134 CoverageAnalysis]: Checked inductivity of 11660 backedges. 5856 proven. 2420 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-23 10:07:46,795 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:46,795 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:07:46,795 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:07:46,795 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:07:46,795 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:46,795 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:07:46,803 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:07:46,803 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:07:46,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:07:46,872 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:07:47,855 INFO L134 CoverageAnalysis]: Checked inductivity of 11660 backedges. 0 proven. 11660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:47,855 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:07:49,661 INFO L134 CoverageAnalysis]: Checked inductivity of 11660 backedges. 0 proven. 11660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:49,682 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:07:49,682 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 91, 91] total 102 [2018-10-23 10:07:49,682 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:07:49,683 INFO L460 AbstractCegarLoop]: Interpolant automaton has 93 states [2018-10-23 10:07:49,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2018-10-23 10:07:49,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:49,684 INFO L87 Difference]: Start difference. First operand 276 states and 314 transitions. Second operand 93 states. [2018-10-23 10:07:50,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:07:50,586 INFO L93 Difference]: Finished difference Result 291 states and 335 transitions. [2018-10-23 10:07:50,587 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2018-10-23 10:07:50,587 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 275 [2018-10-23 10:07:50,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:07:50,588 INFO L225 Difference]: With dead ends: 291 [2018-10-23 10:07:50,589 INFO L226 Difference]: Without dead ends: 286 [2018-10-23 10:07:50,589 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 412 SyntacticMatches, 80 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14702 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:50,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2018-10-23 10:07:50,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 285. [2018-10-23 10:07:50,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 285 states. [2018-10-23 10:07:50,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 285 states to 285 states and 326 transitions. [2018-10-23 10:07:50,600 INFO L78 Accepts]: Start accepts. Automaton has 285 states and 326 transitions. Word has length 275 [2018-10-23 10:07:50,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:07:50,600 INFO L481 AbstractCegarLoop]: Abstraction has 285 states and 326 transitions. [2018-10-23 10:07:50,600 INFO L482 AbstractCegarLoop]: Interpolant automaton has 93 states. [2018-10-23 10:07:50,601 INFO L276 IsEmpty]: Start isEmpty. Operand 285 states and 326 transitions. [2018-10-23 10:07:50,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2018-10-23 10:07:50,602 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:07:50,602 INFO L375 BasicCegarLoop]: trace histogram [92, 91, 50, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:07:50,602 INFO L424 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:07:50,603 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:07:50,603 INFO L82 PathProgramCache]: Analyzing trace with hash 1554678556, now seen corresponding path program 62 times [2018-10-23 10:07:50,603 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:07:50,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:50,604 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:07:50,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:50,604 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:07:50,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:07:51,842 INFO L134 CoverageAnalysis]: Checked inductivity of 12467 backedges. 6288 proven. 2795 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-23 10:07:51,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:51,842 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:07:51,842 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:07:51,843 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:07:51,843 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:51,843 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:07:51,851 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:07:51,851 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:07:51,919 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:07:51,920 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:07:51,923 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:07:52,923 INFO L134 CoverageAnalysis]: Checked inductivity of 12467 backedges. 0 proven. 12467 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:52,923 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:07:54,796 INFO L134 CoverageAnalysis]: Checked inductivity of 12467 backedges. 0 proven. 12467 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:54,816 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:07:54,817 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 94, 94] total 102 [2018-10-23 10:07:54,817 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:07:54,817 INFO L460 AbstractCegarLoop]: Interpolant automaton has 96 states [2018-10-23 10:07:54,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2018-10-23 10:07:54,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:54,819 INFO L87 Difference]: Start difference. First operand 285 states and 326 transitions. Second operand 96 states. [2018-10-23 10:07:55,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:07:55,704 INFO L93 Difference]: Finished difference Result 300 states and 347 transitions. [2018-10-23 10:07:55,704 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2018-10-23 10:07:55,705 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 284 [2018-10-23 10:07:55,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:07:55,706 INFO L225 Difference]: With dead ends: 300 [2018-10-23 10:07:55,706 INFO L226 Difference]: Without dead ends: 295 [2018-10-23 10:07:55,707 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 613 GetRequests, 427 SyntacticMatches, 86 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15437 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:55,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2018-10-23 10:07:55,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 294. [2018-10-23 10:07:55,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 294 states. [2018-10-23 10:07:55,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 338 transitions. [2018-10-23 10:07:55,718 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 338 transitions. Word has length 284 [2018-10-23 10:07:55,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:07:55,718 INFO L481 AbstractCegarLoop]: Abstraction has 294 states and 338 transitions. [2018-10-23 10:07:55,718 INFO L482 AbstractCegarLoop]: Interpolant automaton has 96 states. [2018-10-23 10:07:55,718 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 338 transitions. [2018-10-23 10:07:55,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 294 [2018-10-23 10:07:55,720 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:07:55,720 INFO L375 BasicCegarLoop]: trace histogram [95, 94, 50, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:07:55,720 INFO L424 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:07:55,720 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:07:55,721 INFO L82 PathProgramCache]: Analyzing trace with hash -382747873, now seen corresponding path program 63 times [2018-10-23 10:07:55,721 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:07:55,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:55,721 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:07:55,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:07:55,722 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:07:55,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:07:56,887 INFO L134 CoverageAnalysis]: Checked inductivity of 13301 backedges. 6720 proven. 3197 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-23 10:07:56,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:56,887 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:07:56,887 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:07:56,887 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:07:56,888 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:07:56,888 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:07:56,901 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:07:56,901 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:07:56,978 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:07:56,979 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:07:56,982 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:07:57,983 INFO L134 CoverageAnalysis]: Checked inductivity of 13301 backedges. 0 proven. 13301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:57,983 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:07:59,854 INFO L134 CoverageAnalysis]: Checked inductivity of 13301 backedges. 0 proven. 13301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:07:59,874 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:07:59,874 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 97, 97] total 102 [2018-10-23 10:07:59,875 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:07:59,875 INFO L460 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-10-23 10:07:59,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-10-23 10:07:59,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:07:59,877 INFO L87 Difference]: Start difference. First operand 294 states and 338 transitions. Second operand 99 states. [2018-10-23 10:08:00,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:08:00,968 INFO L93 Difference]: Finished difference Result 309 states and 359 transitions. [2018-10-23 10:08:00,969 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-10-23 10:08:00,969 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 293 [2018-10-23 10:08:00,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:08:00,970 INFO L225 Difference]: With dead ends: 309 [2018-10-23 10:08:00,970 INFO L226 Difference]: Without dead ends: 304 [2018-10-23 10:08:00,971 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 634 GetRequests, 442 SyntacticMatches, 92 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16172 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:08:00,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2018-10-23 10:08:00,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 303. [2018-10-23 10:08:00,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 303 states. [2018-10-23 10:08:00,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 350 transitions. [2018-10-23 10:08:00,981 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 350 transitions. Word has length 293 [2018-10-23 10:08:00,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:08:00,982 INFO L481 AbstractCegarLoop]: Abstraction has 303 states and 350 transitions. [2018-10-23 10:08:00,982 INFO L482 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-10-23 10:08:00,982 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 350 transitions. [2018-10-23 10:08:00,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 303 [2018-10-23 10:08:00,983 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:08:00,983 INFO L375 BasicCegarLoop]: trace histogram [98, 97, 50, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:08:00,984 INFO L424 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:08:00,984 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:08:00,984 INFO L82 PathProgramCache]: Analyzing trace with hash -1880762756, now seen corresponding path program 64 times [2018-10-23 10:08:00,984 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:08:00,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:08:00,985 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:08:00,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:08:00,985 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:08:01,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:08:02,402 INFO L134 CoverageAnalysis]: Checked inductivity of 14162 backedges. 7152 proven. 3626 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-23 10:08:02,402 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:08:02,402 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:08:02,402 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:08:02,402 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:08:02,402 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:08:02,403 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:08:02,410 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:08:02,410 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:08:02,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:08:02,488 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:08:03,494 INFO L134 CoverageAnalysis]: Checked inductivity of 14162 backedges. 0 proven. 14162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:08:03,494 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:08:05,426 INFO L134 CoverageAnalysis]: Checked inductivity of 14162 backedges. 0 proven. 14162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:08:05,447 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:08:05,447 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 100, 100] total 102 [2018-10-23 10:08:05,447 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:08:05,447 INFO L460 AbstractCegarLoop]: Interpolant automaton has 102 states [2018-10-23 10:08:05,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2018-10-23 10:08:05,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:08:05,448 INFO L87 Difference]: Start difference. First operand 303 states and 350 transitions. Second operand 102 states. [2018-10-23 10:08:06,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:08:06,548 INFO L93 Difference]: Finished difference Result 317 states and 369 transitions. [2018-10-23 10:08:06,549 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2018-10-23 10:08:06,549 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 302 [2018-10-23 10:08:06,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:08:06,551 INFO L225 Difference]: With dead ends: 317 [2018-10-23 10:08:06,551 INFO L226 Difference]: Without dead ends: 312 [2018-10-23 10:08:06,552 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 655 GetRequests, 457 SyntacticMatches, 98 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16907 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-23 10:08:06,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2018-10-23 10:08:06,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 312. [2018-10-23 10:08:06,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 312 states. [2018-10-23 10:08:06,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 362 transitions. [2018-10-23 10:08:06,564 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 362 transitions. Word has length 302 [2018-10-23 10:08:06,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:08:06,564 INFO L481 AbstractCegarLoop]: Abstraction has 312 states and 362 transitions. [2018-10-23 10:08:06,564 INFO L482 AbstractCegarLoop]: Interpolant automaton has 102 states. [2018-10-23 10:08:06,564 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 362 transitions. [2018-10-23 10:08:06,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 312 [2018-10-23 10:08:06,566 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:08:06,566 INFO L375 BasicCegarLoop]: trace histogram [101, 100, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:08:06,566 INFO L424 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:08:06,567 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:08:06,567 INFO L82 PathProgramCache]: Analyzing trace with hash -1819528257, now seen corresponding path program 65 times [2018-10-23 10:08:06,567 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:08:06,567 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:08:06,567 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:08:06,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:08:06,568 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:08:06,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:08:08,625 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 0 proven. 11225 refuted. 0 times theorem prover too weak. 3825 trivial. 0 not checked. [2018-10-23 10:08:08,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:08:08,626 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:08:08,626 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:08:08,626 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:08:08,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:08:08,626 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:08:08,634 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:08:08,634 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:08:08,713 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:08:08,713 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:08:08,718 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:08:09,038 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 0 proven. 11225 refuted. 0 times theorem prover too weak. 3825 trivial. 0 not checked. [2018-10-23 10:08:09,038 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:08:09,508 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 0 proven. 11225 refuted. 0 times theorem prover too weak. 3825 trivial. 0 not checked. [2018-10-23 10:08:09,528 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:08:09,528 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 57 [2018-10-23 10:08:09,528 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:08:09,529 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-23 10:08:09,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-23 10:08:09,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=3079, Unknown=0, NotChecked=0, Total=3192 [2018-10-23 10:08:09,529 INFO L87 Difference]: Start difference. First operand 312 states and 362 transitions. Second operand 55 states. [2018-10-23 10:08:11,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:08:11,730 INFO L93 Difference]: Finished difference Result 4294 states and 5669 transitions. [2018-10-23 10:08:11,730 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-23 10:08:11,730 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 311 [2018-10-23 10:08:11,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:08:11,744 INFO L225 Difference]: With dead ends: 4294 [2018-10-23 10:08:11,745 INFO L226 Difference]: Without dead ends: 4289 [2018-10-23 10:08:11,746 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 677 GetRequests, 616 SyntacticMatches, 5 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=119, Invalid=3187, Unknown=0, NotChecked=0, Total=3306 [2018-10-23 10:08:11,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4289 states. [2018-10-23 10:08:11,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4289 to 315. [2018-10-23 10:08:11,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 315 states. [2018-10-23 10:08:11,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 366 transitions. [2018-10-23 10:08:11,827 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 366 transitions. Word has length 311 [2018-10-23 10:08:11,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:08:11,827 INFO L481 AbstractCegarLoop]: Abstraction has 315 states and 366 transitions. [2018-10-23 10:08:11,827 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-23 10:08:11,827 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 366 transitions. [2018-10-23 10:08:11,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2018-10-23 10:08:11,829 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:08:11,829 INFO L375 BasicCegarLoop]: trace histogram [102, 101, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:08:11,830 INFO L424 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:08:11,830 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:08:11,830 INFO L82 PathProgramCache]: Analyzing trace with hash 908591292, now seen corresponding path program 66 times [2018-10-23 10:08:11,830 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:08:11,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:08:11,831 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:08:11,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:08:11,831 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:08:11,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:08:13,302 INFO L134 CoverageAnalysis]: Checked inductivity of 15352 backedges. 11527 proven. 0 refuted. 0 times theorem prover too weak. 3825 trivial. 0 not checked. [2018-10-23 10:08:13,302 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 10:08:13,302 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2018-10-23 10:08:13,302 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-23 10:08:13,303 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-23 10:08:13,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-23 10:08:13,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:08:13,303 INFO L87 Difference]: Start difference. First operand 315 states and 366 transitions. Second operand 52 states. [2018-10-23 10:08:13,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:08:13,744 INFO L93 Difference]: Finished difference Result 464 states and 564 transitions. [2018-10-23 10:08:13,747 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-23 10:08:13,747 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 314 [2018-10-23 10:08:13,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:08:13,748 INFO L225 Difference]: With dead ends: 464 [2018-10-23 10:08:13,748 INFO L226 Difference]: Without dead ends: 0 [2018-10-23 10:08:13,749 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-23 10:08:13,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-10-23 10:08:13,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-10-23 10:08:13,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-10-23 10:08:13,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-10-23 10:08:13,750 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 314 [2018-10-23 10:08:13,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:08:13,750 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-10-23 10:08:13,750 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-23 10:08:13,750 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-10-23 10:08:13,750 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-10-23 10:08:13,755 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-10-23 10:08:14,644 WARN L179 SmtUtils]: Spent 872.00 ms on a formula simplification. DAG size of input: 1848 DAG size of output: 432 [2018-10-23 10:08:17,689 WARN L179 SmtUtils]: Spent 2.98 s on a formula simplification. DAG size of input: 432 DAG size of output: 357 [2018-10-23 10:08:17,702 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-10-23 10:08:17,702 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-10-23 10:08:17,702 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-10-23 10:08:17,702 INFO L428 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-10-23 10:08:17,702 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-10-23 10:08:17,702 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-10-23 10:08:17,702 INFO L428 ceAbstractionStarter]: At program point mainENTRY(lines 10 23) the Hoare annotation is: true [2018-10-23 10:08:17,702 INFO L425 ceAbstractionStarter]: For program point mainEXIT(lines 10 23) no Hoare annotation was computed. [2018-10-23 10:08:17,702 INFO L425 ceAbstractionStarter]: For program point L21(line 21) no Hoare annotation was computed. [2018-10-23 10:08:17,702 INFO L425 ceAbstractionStarter]: For program point L14(lines 14 19) no Hoare annotation was computed. [2018-10-23 10:08:17,702 INFO L425 ceAbstractionStarter]: For program point mainFINAL(lines 10 23) no Hoare annotation was computed. [2018-10-23 10:08:17,702 INFO L425 ceAbstractionStarter]: For program point L13-1(lines 13 20) no Hoare annotation was computed. [2018-10-23 10:08:17,705 INFO L421 ceAbstractionStarter]: At program point L14-2(lines 13 20) the Hoare annotation is: (or (and (and (<= main_~x~0 99) (<= 99 main_~y~0) (<= main_~y~0 99)) (<= 99 main_~x~0)) (and (and (<= main_~y~0 92) (<= 92 main_~y~0) (<= main_~x~0 92)) (<= 92 main_~x~0)) (and (<= 65 main_~x~0) (and (<= main_~y~0 65) (<= 65 main_~y~0) (<= main_~x~0 65))) (and (and (<= main_~y~0 100) (< 99 main_~y~0)) (<= 100 main_~x~0)) (and (<= 64 main_~x~0) (and (<= main_~x~0 64) (<= 64 main_~y~0) (<= main_~y~0 64))) (and (<= 76 main_~x~0) (and (<= main_~y~0 76) (<= main_~x~0 76) (<= 76 main_~y~0))) (and (<= 87 main_~x~0) (and (<= main_~x~0 87) (<= main_~y~0 87) (<= 87 main_~y~0))) (and (and (<= main_~y~0 78) (<= 78 main_~y~0) (<= main_~x~0 78)) (<= 78 main_~x~0)) (and (<= 72 main_~x~0) (and (<= main_~y~0 72) (<= main_~x~0 72) (<= 72 main_~y~0))) (and (and (<= main_~y~0 69) (<= 69 main_~y~0) (<= main_~x~0 69)) (<= 69 main_~x~0)) (and (<= 60 main_~x~0) (and (<= main_~x~0 60) (<= main_~y~0 60) (<= 60 main_~y~0))) (and (<= 67 main_~x~0) (and (<= main_~y~0 67) (<= main_~x~0 67) (<= 67 main_~y~0))) (and (and (<= main_~y~0 55) (<= 55 main_~y~0) (<= main_~x~0 55)) (<= 55 main_~x~0)) (and (and (<= 73 main_~y~0) (<= main_~x~0 73) (<= main_~y~0 73)) (<= 73 main_~x~0)) (and (<= 66 main_~x~0) (and (<= main_~y~0 66) (<= 66 main_~y~0) (<= main_~x~0 66))) (and (and (<= main_~x~0 70) (<= main_~y~0 70) (<= 70 main_~y~0)) (<= 70 main_~x~0)) (and (and (<= main_~x~0 95) (<= main_~y~0 95) (<= 95 main_~y~0)) (<= 95 main_~x~0)) (and (and (<= 90 main_~y~0) (<= main_~y~0 90) (<= main_~x~0 90)) (<= 90 main_~x~0)) (and (and (<= main_~y~0 59) (<= main_~x~0 59) (<= 59 main_~y~0)) (<= 59 main_~x~0)) (and (<= 85 main_~x~0) (and (<= 85 main_~y~0) (<= main_~x~0 85) (<= main_~y~0 85))) (and (<= 63 main_~x~0) (and (<= main_~y~0 63) (<= main_~x~0 63) (<= 63 main_~y~0))) (and (and (<= main_~y~0 77) (<= main_~x~0 77) (<= 77 main_~y~0)) (<= 77 main_~x~0)) (and (<= 53 main_~x~0) (and (<= main_~y~0 53) (<= main_~x~0 53) (<= 53 main_~y~0))) (and (and (<= main_~x~0 79) (<= main_~y~0 79) (<= 79 main_~y~0)) (<= 79 main_~x~0)) (and (<= 68 main_~x~0) (and (<= 68 main_~y~0) (<= main_~y~0 68) (<= main_~x~0 68))) (and (<= 54 main_~x~0) (and (<= main_~x~0 54) (<= 54 main_~y~0) (<= main_~y~0 54))) (and (<= 51 main_~x~0) (and (<= 51 main_~y~0) (<= main_~x~0 51) (<= main_~y~0 51))) (and (and (<= 56 main_~y~0) (<= main_~x~0 56) (<= main_~y~0 56)) (<= 56 main_~x~0)) (and (<= 61 main_~x~0) (and (<= main_~y~0 61) (<= 61 main_~y~0) (<= main_~x~0 61))) (and (<= 88 main_~x~0) (and (<= main_~x~0 88) (<= main_~y~0 88) (<= 88 main_~y~0))) (and (<= main_~y~0 50) (<= main_~x~0 50) (<= 50 main_~y~0)) (and (<= 80 main_~x~0) (and (<= main_~x~0 80) (<= 80 main_~y~0) (<= main_~y~0 80))) (and (<= 94 main_~x~0) (and (<= main_~x~0 94) (<= main_~y~0 94) (<= 94 main_~y~0))) (and (<= 89 main_~x~0) (and (<= 89 main_~y~0) (<= main_~y~0 89) (<= main_~x~0 89))) (and (and (<= 86 main_~y~0) (<= main_~x~0 86) (<= main_~y~0 86)) (<= 86 main_~x~0)) (and (<= 58 main_~x~0) (and (<= main_~x~0 58) (<= main_~y~0 58) (<= 58 main_~y~0))) (and (and (<= main_~x~0 91) (<= 91 main_~y~0) (<= main_~y~0 91)) (<= 91 main_~x~0)) (and (and (<= 52 main_~y~0) (<= main_~y~0 52) (<= main_~x~0 52)) (<= 52 main_~x~0)) (and (<= 93 main_~x~0) (and (<= main_~x~0 93) (<= 93 main_~y~0) (<= main_~y~0 93))) (and (<= 74 main_~x~0) (and (<= 74 main_~y~0) (<= main_~y~0 74) (<= main_~x~0 74))) (and (and (<= main_~y~0 71) (<= main_~x~0 71) (<= 71 main_~y~0)) (<= 71 main_~x~0)) (and (<= 57 main_~x~0) (and (<= 57 main_~y~0) (<= main_~x~0 57) (<= main_~y~0 57))) (and (<= 97 main_~x~0) (and (<= 97 main_~y~0) (<= main_~x~0 97) (<= main_~y~0 97))) (and (and (<= main_~x~0 81) (<= 81 main_~y~0) (<= main_~y~0 81)) (<= 81 main_~x~0)) (and (<= 84 main_~x~0) (and (<= main_~y~0 84) (<= 84 main_~y~0) (<= main_~x~0 84))) (and (and (<= 96 main_~y~0) (<= main_~x~0 96) (<= main_~y~0 96)) (<= 96 main_~x~0)) (and (<= 83 main_~x~0) (and (<= main_~y~0 83) (<= 83 main_~y~0) (<= main_~x~0 83))) (and (<= 62 main_~x~0) (and (<= main_~y~0 62) (<= main_~x~0 62) (<= 62 main_~y~0))) (and (and (<= main_~x~0 98) (<= main_~y~0 98) (<= 98 main_~y~0)) (<= 98 main_~x~0)) (and (and (<= 75 main_~y~0) (<= main_~x~0 75) (<= main_~y~0 75)) (<= 75 main_~x~0)) (and (and (<= 82 main_~y~0) (<= main_~y~0 82) (<= main_~x~0 82)) (<= 82 main_~x~0))) [2018-10-23 10:08:17,705 INFO L421 ceAbstractionStarter]: At program point L13-3(lines 13 20) the Hoare annotation is: (and (<= main_~y~0 100) (< 99 main_~y~0)) [2018-10-23 10:08:17,705 INFO L428 ceAbstractionStarter]: At program point __VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2018-10-23 10:08:17,705 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 5) no Hoare annotation was computed. [2018-10-23 10:08:17,705 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertEXIT(lines 3 8) no Hoare annotation was computed. [2018-10-23 10:08:17,705 INFO L425 ceAbstractionStarter]: For program point L5(line 5) no Hoare annotation was computed. [2018-10-23 10:08:17,706 INFO L425 ceAbstractionStarter]: For program point L4(lines 4 6) no Hoare annotation was computed. [2018-10-23 10:08:17,706 INFO L425 ceAbstractionStarter]: For program point L4-2(lines 3 8) no Hoare annotation was computed. [2018-10-23 10:08:17,730 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 10:08:17 BoogieIcfgContainer [2018-10-23 10:08:17,730 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-23 10:08:17,731 INFO L168 Benchmark]: Toolchain (without parser) took 170760.36 ms. Allocated memory was 1.5 GB in the beginning and 2.5 GB in the end (delta: 926.9 MB). Free memory was 1.4 GB in the beginning and 1.6 GB in the end (delta: -208.9 MB). Peak memory consumption was 718.0 MB. Max. memory is 7.1 GB. [2018-10-23 10:08:17,732 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-23 10:08:17,732 INFO L168 Benchmark]: CACSL2BoogieTranslator took 257.82 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-23 10:08:17,733 INFO L168 Benchmark]: Boogie Procedure Inliner took 22.25 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-23 10:08:17,733 INFO L168 Benchmark]: Boogie Preprocessor took 28.37 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-23 10:08:17,733 INFO L168 Benchmark]: RCFGBuilder took 325.54 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 754.5 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -804.9 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. [2018-10-23 10:08:17,734 INFO L168 Benchmark]: TraceAbstraction took 170122.05 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 172.5 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 585.5 MB). Peak memory consumption was 758.0 MB. Max. memory is 7.1 GB. [2018-10-23 10:08:17,736 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 257.82 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 22.25 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 28.37 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 325.54 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 754.5 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -804.9 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 170122.05 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 172.5 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 585.5 MB). Peak memory consumption was 758.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 13]: Loop Invariant Derived loop invariant: ((((((((((((((((((((((((((((((((((((((((((((((((((((x <= 99 && 99 <= y) && y <= 99) && 99 <= x) || (((y <= 92 && 92 <= y) && x <= 92) && 92 <= x)) || (65 <= x && (y <= 65 && 65 <= y) && x <= 65)) || ((y <= 100 && 99 < y) && 100 <= x)) || (64 <= x && (x <= 64 && 64 <= y) && y <= 64)) || (76 <= x && (y <= 76 && x <= 76) && 76 <= y)) || (87 <= x && (x <= 87 && y <= 87) && 87 <= y)) || (((y <= 78 && 78 <= y) && x <= 78) && 78 <= x)) || (72 <= x && (y <= 72 && x <= 72) && 72 <= y)) || (((y <= 69 && 69 <= y) && x <= 69) && 69 <= x)) || (60 <= x && (x <= 60 && y <= 60) && 60 <= y)) || (67 <= x && (y <= 67 && x <= 67) && 67 <= y)) || (((y <= 55 && 55 <= y) && x <= 55) && 55 <= x)) || (((73 <= y && x <= 73) && y <= 73) && 73 <= x)) || (66 <= x && (y <= 66 && 66 <= y) && x <= 66)) || (((x <= 70 && y <= 70) && 70 <= y) && 70 <= x)) || (((x <= 95 && y <= 95) && 95 <= y) && 95 <= x)) || (((90 <= y && y <= 90) && x <= 90) && 90 <= x)) || (((y <= 59 && x <= 59) && 59 <= y) && 59 <= x)) || (85 <= x && (85 <= y && x <= 85) && y <= 85)) || (63 <= x && (y <= 63 && x <= 63) && 63 <= y)) || (((y <= 77 && x <= 77) && 77 <= y) && 77 <= x)) || (53 <= x && (y <= 53 && x <= 53) && 53 <= y)) || (((x <= 79 && y <= 79) && 79 <= y) && 79 <= x)) || (68 <= x && (68 <= y && y <= 68) && x <= 68)) || (54 <= x && (x <= 54 && 54 <= y) && y <= 54)) || (51 <= x && (51 <= y && x <= 51) && y <= 51)) || (((56 <= y && x <= 56) && y <= 56) && 56 <= x)) || (61 <= x && (y <= 61 && 61 <= y) && x <= 61)) || (88 <= x && (x <= 88 && y <= 88) && 88 <= y)) || ((y <= 50 && x <= 50) && 50 <= y)) || (80 <= x && (x <= 80 && 80 <= y) && y <= 80)) || (94 <= x && (x <= 94 && y <= 94) && 94 <= y)) || (89 <= x && (89 <= y && y <= 89) && x <= 89)) || (((86 <= y && x <= 86) && y <= 86) && 86 <= x)) || (58 <= x && (x <= 58 && y <= 58) && 58 <= y)) || (((x <= 91 && 91 <= y) && y <= 91) && 91 <= x)) || (((52 <= y && y <= 52) && x <= 52) && 52 <= x)) || (93 <= x && (x <= 93 && 93 <= y) && y <= 93)) || (74 <= x && (74 <= y && y <= 74) && x <= 74)) || (((y <= 71 && x <= 71) && 71 <= y) && 71 <= x)) || (57 <= x && (57 <= y && x <= 57) && y <= 57)) || (97 <= x && (97 <= y && x <= 97) && y <= 97)) || (((x <= 81 && 81 <= y) && y <= 81) && 81 <= x)) || (84 <= x && (y <= 84 && 84 <= y) && x <= 84)) || (((96 <= y && x <= 96) && y <= 96) && 96 <= x)) || (83 <= x && (y <= 83 && 83 <= y) && x <= 83)) || (62 <= x && (y <= 62 && x <= 62) && 62 <= y)) || (((x <= 98 && y <= 98) && 98 <= y) && 98 <= x)) || (((75 <= y && x <= 75) && y <= 75) && 75 <= x)) || (((82 <= y && y <= 82) && x <= 82) && 82 <= x) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. SAFE Result, 170.0s OverallTime, 69 OverallIterations, 102 TraceHistogramMax, 20.8s AutomataDifference, 0.0s DeadEndRemovalTime, 3.9s HoareAnnotationTime, HoareTripleCheckerStatistics: 1016 SDtfs, 1294 SDslu, 21053 SDs, 0 SdLazy, 10524 SolverSat, 1938 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 12.7s Time, PredicateUnifierStatistics: 2 DeclaredPredicates, 19282 GetRequests, 14310 SyntacticMatches, 1459 SemanticMatches, 3513 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191474 ImplicationChecksByTransitivity, 131.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=315occurred in iteration=68, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 2 AbstIntIterations, 1 AbstIntStrong, 1.0 AbsIntWeakeningRatio, 0.3076923076923077 AbsIntAvgWeakeningVarsNumRemoved, 0.0 AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.6s AutomataMinimizationTime, 69 MinimizatonAttempts, 3993 StatesRemovedByMinimization, 17 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 75 PreInvPairs, 177 NumberOfFragments, 720 HoareAnnotationTreeSize, 75 FomulaSimplifications, 18034 FormulaSimplificationTreeSizeReduction, 0.9s HoareSimplificationTime, 7 FomulaSimplificationsInter, 404 FormulaSimplificationTreeSizeReductionInter, 3.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 2.7s SatisfiabilityAnalysisTime, 137.5s InterpolantComputationTime, 17733 NumberOfCodeBlocks, 17733 NumberOfCodeBlocksAsserted, 177 NumberOfCheckSat, 26226 ConstructedInterpolants, 0 QuantifiedInterpolants, 13192692 SizeOfPredicates, 21 NumberOfNonLiveVariables, 16188 ConjunctsInSsa, 2565 ConjunctsInUnsatCore, 199 InterpolantComputations, 3 PerfectInterpolantSequences, 191940/697920 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...