java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/seq_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:16:12,804 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:16:12,808 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:16:12,825 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:16:12,825 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:16:12,826 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:16:12,828 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:16:12,830 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:16:12,833 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:16:12,834 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:16:12,842 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:16:12,843 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:16:12,844 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:16:12,846 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:16:12,847 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:16:12,849 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:16:12,850 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:16:12,855 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:16:12,858 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:16:12,859 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:16:12,861 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:16:12,862 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:16:12,865 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-24 12:16:12,874 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 [2018-10-24 12:16:12,894 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:16:12,895 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:16:12,896 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:16:12,896 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:16:12,896 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:16:12,896 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:16:12,896 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:16:12,897 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:16:12,897 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:16:12,897 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:16:12,897 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:16:12,897 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:16:12,898 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:16:12,898 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:16:12,898 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:16:12,899 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:16:12,899 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:16:12,899 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:16:12,899 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:16:12,899 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:16:12,900 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:16:12,900 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:16:12,900 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:16:12,900 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:16:12,900 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:16:12,901 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:16:12,901 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:16:12,901 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:16:12,901 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:16:12,901 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:16:12,901 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:16:12,902 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:16:12,902 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:16:12,902 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:16:12,948 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:16:12,964 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:16:12,967 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:16:12,968 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:16:12,968 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:16:12,969 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-invgen/seq_true-unreach-call_true-termination.i [2018-10-24 12:16:13,023 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/dcabd1aa5/a4b963fb2b6f4538bf0af96b63c01886/FLAGbf784712b [2018-10-24 12:16:13,445 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:16:13,446 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/seq_true-unreach-call_true-termination.i [2018-10-24 12:16:13,452 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/dcabd1aa5/a4b963fb2b6f4538bf0af96b63c01886/FLAGbf784712b [2018-10-24 12:16:13,465 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/dcabd1aa5/a4b963fb2b6f4538bf0af96b63c01886 [2018-10-24 12:16:13,478 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:16:13,479 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:16:13,480 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:16:13,480 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:16:13,484 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:16:13,485 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:16:13" (1/1) ... [2018-10-24 12:16:13,489 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22ec437b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:13, skipping insertion in model container [2018-10-24 12:16:13,489 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:16:13" (1/1) ... [2018-10-24 12:16:13,501 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:16:13,529 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:16:13,755 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:16:13,761 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:16:13,784 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:16:13,798 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:16:13,799 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:13 WrapperNode [2018-10-24 12:16:13,799 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:16:13,800 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:16:13,800 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:16:13,800 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:16:13,808 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:13" (1/1) ... [2018-10-24 12:16:13,813 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:13" (1/1) ... [2018-10-24 12:16:13,819 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:16:13,820 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:16:13,820 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:16:13,820 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:16:13,830 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:13" (1/1) ... [2018-10-24 12:16:13,830 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:13" (1/1) ... [2018-10-24 12:16:13,831 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:13" (1/1) ... [2018-10-24 12:16:13,831 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:13" (1/1) ... [2018-10-24 12:16:13,835 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:13" (1/1) ... [2018-10-24 12:16:13,841 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:13" (1/1) ... [2018-10-24 12:16:13,842 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:13" (1/1) ... [2018-10-24 12:16:13,844 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:16:13,844 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:16:13,844 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:16:13,845 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:16:13,845 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:13" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:16:13,971 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:16:13,972 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:16:13,972 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:16:13,972 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:16:13,972 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:16:13,972 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:16:13,972 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:16:13,973 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:16:14,354 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:16:14,354 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:16:14 BoogieIcfgContainer [2018-10-24 12:16:14,354 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:16:14,355 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:16:14,355 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:16:14,359 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:16:14,359 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:16:13" (1/3) ... [2018-10-24 12:16:14,360 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39bab8f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:16:14, skipping insertion in model container [2018-10-24 12:16:14,360 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:16:13" (2/3) ... [2018-10-24 12:16:14,361 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39bab8f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:16:14, skipping insertion in model container [2018-10-24 12:16:14,361 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:16:14" (3/3) ... [2018-10-24 12:16:14,362 INFO L112 eAbstractionObserver]: Analyzing ICFG seq_true-unreach-call_true-termination.i [2018-10-24 12:16:14,373 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:16:14,381 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:16:14,398 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:16:14,431 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:16:14,431 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:16:14,431 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:16:14,432 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:16:14,432 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:16:14,432 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:16:14,432 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:16:14,432 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:16:14,451 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2018-10-24 12:16:14,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 12:16:14,458 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:14,459 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:14,461 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:14,468 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:14,468 INFO L82 PathProgramCache]: Analyzing trace with hash 301890663, now seen corresponding path program 1 times [2018-10-24 12:16:14,471 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:14,521 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:14,521 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:14,521 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:14,521 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:14,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:14,591 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:14,593 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:16:14,594 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:16:14,594 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:16:14,598 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:16:14,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:16:14,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:16:14,615 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2018-10-24 12:16:14,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:14,638 INFO L93 Difference]: Finished difference Result 45 states and 58 transitions. [2018-10-24 12:16:14,638 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:16:14,640 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-10-24 12:16:14,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:14,651 INFO L225 Difference]: With dead ends: 45 [2018-10-24 12:16:14,652 INFO L226 Difference]: Without dead ends: 23 [2018-10-24 12:16:14,655 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:16:14,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-10-24 12:16:14,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-10-24 12:16:14,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-24 12:16:14,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2018-10-24 12:16:14,695 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 17 [2018-10-24 12:16:14,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:14,695 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2018-10-24 12:16:14,696 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:16:14,696 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2018-10-24 12:16:14,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-24 12:16:14,697 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:14,697 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:14,697 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:14,698 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:14,698 INFO L82 PathProgramCache]: Analyzing trace with hash 1130037681, now seen corresponding path program 1 times [2018-10-24 12:16:14,698 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:14,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:14,699 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:14,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:14,700 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:14,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:15,146 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:15,146 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:16:15,146 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2018-10-24 12:16:15,147 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:16:15,148 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:16:15,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:16:15,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:16:15,149 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 7 states. [2018-10-24 12:16:15,590 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2018-10-24 12:16:15,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:15,642 INFO L93 Difference]: Finished difference Result 48 states and 54 transitions. [2018-10-24 12:16:15,643 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:16:15,643 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-10-24 12:16:15,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:15,646 INFO L225 Difference]: With dead ends: 48 [2018-10-24 12:16:15,646 INFO L226 Difference]: Without dead ends: 35 [2018-10-24 12:16:15,648 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:16:15,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-10-24 12:16:15,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28. [2018-10-24 12:16:15,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-24 12:16:15,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2018-10-24 12:16:15,660 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 19 [2018-10-24 12:16:15,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:15,661 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2018-10-24 12:16:15,661 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:16:15,661 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2018-10-24 12:16:15,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-24 12:16:15,662 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:15,662 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:15,662 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:15,663 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:15,663 INFO L82 PathProgramCache]: Analyzing trace with hash -1499928661, now seen corresponding path program 1 times [2018-10-24 12:16:15,663 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:15,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:15,664 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:15,665 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:15,665 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:15,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:15,753 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:15,754 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:16:15,756 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-10-24 12:16:15,756 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:16:15,757 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:16:15,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:16:15,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:16:15,758 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 6 states. [2018-10-24 12:16:15,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:15,911 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2018-10-24 12:16:15,912 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:16:15,912 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2018-10-24 12:16:15,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:15,915 INFO L225 Difference]: With dead ends: 42 [2018-10-24 12:16:15,915 INFO L226 Difference]: Without dead ends: 40 [2018-10-24 12:16:15,916 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:16:15,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-24 12:16:15,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 35. [2018-10-24 12:16:15,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-24 12:16:15,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2018-10-24 12:16:15,924 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 21 [2018-10-24 12:16:15,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:15,925 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2018-10-24 12:16:15,925 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:16:15,925 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2018-10-24 12:16:15,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-24 12:16:15,926 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:15,926 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:15,927 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:15,927 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:15,927 INFO L82 PathProgramCache]: Analyzing trace with hash -1355895601, now seen corresponding path program 1 times [2018-10-24 12:16:15,927 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:15,928 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:15,928 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:15,929 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:15,929 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:15,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:16,196 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:16,196 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:16,197 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:16,198 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 30 with the following transitions: [2018-10-24 12:16:16,200 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [16], [20], [26], [30], [34], [36], [40], [44], [50], [52], [57], [60], [62], [65], [67], [68], [69], [70], [72], [73] [2018-10-24 12:16:16,247 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:16:16,247 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:16:16,886 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:16:16,887 INFO L272 AbstractInterpreter]: Visited 24 different actions 235 times. Merged at 8 different actions 93 times. Widened at 3 different actions 17 times. Found 7 fixpoints after 2 different actions. Largest state had 12 variables. [2018-10-24 12:16:16,933 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:16,935 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:16:16,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:16,935 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 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:16,947 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:16,947 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:16,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:16,983 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:17,392 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:17,393 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:17,656 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:17,678 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:17,679 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2018-10-24 12:16:17,679 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:17,679 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:16:17,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:16:17,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:16:17,681 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand 14 states. [2018-10-24 12:16:18,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:18,068 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2018-10-24 12:16:18,068 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:16:18,068 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 29 [2018-10-24 12:16:18,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:18,071 INFO L225 Difference]: With dead ends: 64 [2018-10-24 12:16:18,072 INFO L226 Difference]: Without dead ends: 47 [2018-10-24 12:16:18,072 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 48 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=275, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:16:18,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-10-24 12:16:18,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 37. [2018-10-24 12:16:18,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-24 12:16:18,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-10-24 12:16:18,081 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 29 [2018-10-24 12:16:18,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:18,081 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-10-24 12:16:18,082 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:16:18,082 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-10-24 12:16:18,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-24 12:16:18,083 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:18,083 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:18,084 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:18,084 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:18,084 INFO L82 PathProgramCache]: Analyzing trace with hash 95654235, now seen corresponding path program 1 times [2018-10-24 12:16:18,084 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:18,085 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:18,086 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:18,086 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:18,086 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:18,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:18,227 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:18,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:18,228 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:18,228 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 30 with the following transitions: [2018-10-24 12:16:18,229 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [16], [20], [22], [26], [30], [34], [40], [44], [50], [52], [57], [60], [62], [65], [67], [68], [69], [70], [72], [73] [2018-10-24 12:16:18,231 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:16:18,231 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:16:18,554 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:16:18,555 INFO L272 AbstractInterpreter]: Visited 24 different actions 253 times. Merged at 11 different actions 111 times. Widened at 4 different actions 19 times. Found 7 fixpoints after 2 different actions. Largest state had 12 variables. [2018-10-24 12:16:18,595 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:18,596 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:16:18,596 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:18,596 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:18,609 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:18,609 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:18,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:18,632 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:18,817 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:18,817 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:18,930 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:18,960 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:18,960 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 13 [2018-10-24 12:16:18,960 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:18,961 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:16:18,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:16:18,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:16:18,962 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 13 states. [2018-10-24 12:16:19,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:19,531 INFO L93 Difference]: Finished difference Result 79 states and 91 transitions. [2018-10-24 12:16:19,533 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:16:19,533 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 29 [2018-10-24 12:16:19,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:19,535 INFO L225 Difference]: With dead ends: 79 [2018-10-24 12:16:19,535 INFO L226 Difference]: Without dead ends: 62 [2018-10-24 12:16:19,536 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 49 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=105, Invalid=275, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:16:19,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-10-24 12:16:19,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 40. [2018-10-24 12:16:19,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-24 12:16:19,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2018-10-24 12:16:19,546 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 29 [2018-10-24 12:16:19,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:19,547 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2018-10-24 12:16:19,547 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:16:19,547 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2018-10-24 12:16:19,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-24 12:16:19,548 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:19,548 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:19,549 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:19,549 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:19,549 INFO L82 PathProgramCache]: Analyzing trace with hash -446111159, now seen corresponding path program 2 times [2018-10-24 12:16:19,549 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:19,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:19,550 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:19,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:19,551 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:19,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:19,666 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:19,667 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:19,667 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:19,667 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:19,667 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:19,667 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:19,667 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:19,675 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:19,675 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:19,697 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:16:19,697 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:19,699 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:19,751 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:19,752 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:19,797 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:16:19,818 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:19,819 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 10 [2018-10-24 12:16:19,819 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:19,819 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:16:19,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:16:19,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:16:19,820 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand 10 states. [2018-10-24 12:16:19,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:19,952 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2018-10-24 12:16:19,954 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:16:19,954 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2018-10-24 12:16:19,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:19,958 INFO L225 Difference]: With dead ends: 50 [2018-10-24 12:16:19,958 INFO L226 Difference]: Without dead ends: 48 [2018-10-24 12:16:19,959 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 59 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:16:19,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-24 12:16:19,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-24 12:16:19,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-24 12:16:19,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2018-10-24 12:16:19,966 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 31 [2018-10-24 12:16:19,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:19,966 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2018-10-24 12:16:19,967 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:16:19,967 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2018-10-24 12:16:19,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-24 12:16:19,969 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:19,970 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:19,970 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:19,970 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:19,970 INFO L82 PathProgramCache]: Analyzing trace with hash 94447981, now seen corresponding path program 3 times [2018-10-24 12:16:19,970 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:19,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:19,971 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:19,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:19,972 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:19,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:20,226 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:16:20,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:20,227 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:20,227 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:20,227 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:20,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:20,228 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:20,235 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:20,235 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:20,254 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:20,254 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:20,258 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:20,521 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:16:20,521 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:20,606 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:16:20,627 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:20,627 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 18 [2018-10-24 12:16:20,627 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:20,628 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:16:20,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:16:20,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=235, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:16:20,630 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 18 states. [2018-10-24 12:16:20,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:20,958 INFO L93 Difference]: Finished difference Result 87 states and 98 transitions. [2018-10-24 12:16:20,959 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:16:20,959 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 39 [2018-10-24 12:16:20,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:20,960 INFO L225 Difference]: With dead ends: 87 [2018-10-24 12:16:20,961 INFO L226 Difference]: Without dead ends: 66 [2018-10-24 12:16:20,962 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 64 SyntacticMatches, 8 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=163, Invalid=487, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:16:20,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-24 12:16:20,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 50. [2018-10-24 12:16:20,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-24 12:16:20,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2018-10-24 12:16:20,970 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 39 [2018-10-24 12:16:20,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:20,971 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2018-10-24 12:16:20,971 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:16:20,971 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2018-10-24 12:16:20,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-24 12:16:20,972 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:20,972 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:20,973 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:20,973 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:20,973 INFO L82 PathProgramCache]: Analyzing trace with hash 594202361, now seen corresponding path program 1 times [2018-10-24 12:16:20,973 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:20,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:20,974 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:20,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:20,975 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:20,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:21,117 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 14 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:16:21,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:21,117 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:21,118 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 40 with the following transitions: [2018-10-24 12:16:21,118 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [16], [20], [22], [26], [30], [34], [36], [40], [44], [50], [52], [57], [60], [62], [65], [67], [68], [69], [70], [72], [73] [2018-10-24 12:16:21,120 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:16:21,120 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:16:21,549 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:16:21,549 INFO L272 AbstractInterpreter]: Visited 25 different actions 368 times. Merged at 12 different actions 164 times. Widened at 5 different actions 32 times. Found 21 fixpoints after 4 different actions. Largest state had 14 variables. [2018-10-24 12:16:21,567 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:21,567 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:16:21,567 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:21,567 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:21,577 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:21,577 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:21,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:21,592 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:21,809 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 14 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:16:21,810 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:21,895 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 14 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:16:21,916 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:21,916 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2018-10-24 12:16:21,916 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:21,917 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:16:21,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:16:21,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:16:21,918 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 17 states. [2018-10-24 12:16:22,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:22,181 INFO L93 Difference]: Finished difference Result 103 states and 118 transitions. [2018-10-24 12:16:22,181 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:16:22,181 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2018-10-24 12:16:22,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:22,182 INFO L225 Difference]: With dead ends: 103 [2018-10-24 12:16:22,182 INFO L226 Difference]: Without dead ends: 82 [2018-10-24 12:16:22,183 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 65 SyntacticMatches, 8 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=171, Invalid=531, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:16:22,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-10-24 12:16:22,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 50. [2018-10-24 12:16:22,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-24 12:16:22,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2018-10-24 12:16:22,199 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 39 [2018-10-24 12:16:22,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:22,199 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2018-10-24 12:16:22,199 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:16:22,200 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2018-10-24 12:16:22,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-24 12:16:22,200 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:22,200 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:22,201 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:22,201 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:22,201 INFO L82 PathProgramCache]: Analyzing trace with hash -1103599739, now seen corresponding path program 2 times [2018-10-24 12:16:22,201 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:22,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:22,202 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:22,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:22,202 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:22,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:22,315 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:16:22,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:22,315 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:22,315 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:22,316 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:22,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:22,316 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:22,324 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:22,324 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:22,343 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:16:22,343 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:22,346 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:22,748 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:16:22,748 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:22,899 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:16:22,920 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:22,920 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 16 [2018-10-24 12:16:22,920 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:22,921 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:16:22,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:16:22,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:16:22,921 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 16 states. [2018-10-24 12:16:23,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:23,217 INFO L93 Difference]: Finished difference Result 122 states and 142 transitions. [2018-10-24 12:16:23,218 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:16:23,219 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2018-10-24 12:16:23,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:23,220 INFO L225 Difference]: With dead ends: 122 [2018-10-24 12:16:23,220 INFO L226 Difference]: Without dead ends: 101 [2018-10-24 12:16:23,221 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 66 SyntacticMatches, 8 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=163, Invalid=487, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:16:23,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2018-10-24 12:16:23,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 53. [2018-10-24 12:16:23,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-24 12:16:23,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 58 transitions. [2018-10-24 12:16:23,234 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 58 transitions. Word has length 39 [2018-10-24 12:16:23,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:23,234 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 58 transitions. [2018-10-24 12:16:23,235 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:16:23,235 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 58 transitions. [2018-10-24 12:16:23,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-24 12:16:23,235 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:23,236 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:23,236 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:23,236 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:23,236 INFO L82 PathProgramCache]: Analyzing trace with hash -1990570393, now seen corresponding path program 4 times [2018-10-24 12:16:23,236 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:23,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:23,237 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:23,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:23,238 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:23,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:23,351 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 15 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-24 12:16:23,351 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:23,351 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:23,351 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:23,352 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:23,352 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:23,352 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:23,360 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:23,361 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:23,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:23,377 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:23,410 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:16:23,410 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:23,485 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:16:23,507 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:23,507 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 11 [2018-10-24 12:16:23,507 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:23,508 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:16:23,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:16:23,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:16:23,509 INFO L87 Difference]: Start difference. First operand 53 states and 58 transitions. Second operand 11 states. [2018-10-24 12:16:23,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:23,919 INFO L93 Difference]: Finished difference Result 63 states and 68 transitions. [2018-10-24 12:16:23,920 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:16:23,920 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2018-10-24 12:16:23,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:23,921 INFO L225 Difference]: With dead ends: 63 [2018-10-24 12:16:23,922 INFO L226 Difference]: Without dead ends: 61 [2018-10-24 12:16:23,922 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 78 SyntacticMatches, 7 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:16:23,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-24 12:16:23,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-10-24 12:16:23,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-10-24 12:16:23,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 66 transitions. [2018-10-24 12:16:23,932 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 66 transitions. Word has length 41 [2018-10-24 12:16:23,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:23,932 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 66 transitions. [2018-10-24 12:16:23,932 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:16:23,932 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 66 transitions. [2018-10-24 12:16:23,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 12:16:23,933 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:23,933 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:23,934 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:23,934 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:23,934 INFO L82 PathProgramCache]: Analyzing trace with hash 1735104395, now seen corresponding path program 5 times [2018-10-24 12:16:23,934 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:23,935 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:23,935 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:23,935 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:23,936 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:23,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:24,179 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:16:24,179 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:24,179 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:24,180 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:24,180 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:24,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:24,180 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:24,193 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:24,193 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:24,214 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 12:16:24,214 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:24,216 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:24,483 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:16:24,483 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:24,733 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:16:24,754 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:24,754 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 22 [2018-10-24 12:16:24,754 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:24,755 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:16:24,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:16:24,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=359, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:16:24,756 INFO L87 Difference]: Start difference. First operand 61 states and 66 transitions. Second operand 22 states. [2018-10-24 12:16:25,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:25,211 INFO L93 Difference]: Finished difference Result 110 states and 124 transitions. [2018-10-24 12:16:25,212 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:16:25,212 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 49 [2018-10-24 12:16:25,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:25,213 INFO L225 Difference]: With dead ends: 110 [2018-10-24 12:16:25,213 INFO L226 Difference]: Without dead ends: 85 [2018-10-24 12:16:25,214 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 80 SyntacticMatches, 10 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 338 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=233, Invalid=759, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:16:25,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-24 12:16:25,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 63. [2018-10-24 12:16:25,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-24 12:16:25,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 68 transitions. [2018-10-24 12:16:25,226 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 68 transitions. Word has length 49 [2018-10-24 12:16:25,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:25,226 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 68 transitions. [2018-10-24 12:16:25,227 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:16:25,227 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 68 transitions. [2018-10-24 12:16:25,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 12:16:25,228 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:25,228 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:25,228 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:25,228 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:25,228 INFO L82 PathProgramCache]: Analyzing trace with hash 1916583447, now seen corresponding path program 2 times [2018-10-24 12:16:25,229 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:25,229 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:25,230 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:25,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:25,230 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:25,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:25,418 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:16:25,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:25,418 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:25,419 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:25,419 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:25,419 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:25,419 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:25,426 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:25,427 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:25,496 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 12:16:25,496 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:25,499 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:25,806 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:16:25,806 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:25,974 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:16:25,998 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:25,998 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 21 [2018-10-24 12:16:25,998 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:25,998 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:16:25,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:16:25,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=329, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:16:25,999 INFO L87 Difference]: Start difference. First operand 63 states and 68 transitions. Second operand 21 states. [2018-10-24 12:16:26,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:26,401 INFO L93 Difference]: Finished difference Result 132 states and 151 transitions. [2018-10-24 12:16:26,401 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:16:26,402 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2018-10-24 12:16:26,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:26,403 INFO L225 Difference]: With dead ends: 132 [2018-10-24 12:16:26,403 INFO L226 Difference]: Without dead ends: 107 [2018-10-24 12:16:26,404 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 81 SyntacticMatches, 10 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=253, Invalid=869, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:16:26,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2018-10-24 12:16:26,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 63. [2018-10-24 12:16:26,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-24 12:16:26,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 68 transitions. [2018-10-24 12:16:26,417 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 68 transitions. Word has length 49 [2018-10-24 12:16:26,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:26,417 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 68 transitions. [2018-10-24 12:16:26,417 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:16:26,417 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 68 transitions. [2018-10-24 12:16:26,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 12:16:26,418 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:26,418 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:26,419 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:26,419 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:26,419 INFO L82 PathProgramCache]: Analyzing trace with hash -402778205, now seen corresponding path program 3 times [2018-10-24 12:16:26,419 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:26,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:26,420 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:26,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:26,420 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:26,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:26,628 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:16:26,628 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:26,628 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:26,628 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:26,629 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:26,629 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:26,629 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:26,636 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:26,637 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:26,667 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:26,667 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:26,670 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:26,817 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:16:26,818 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:26,891 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:16:26,912 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:26,912 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2018-10-24 12:16:26,913 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:26,913 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:16:26,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:16:26,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:16:26,914 INFO L87 Difference]: Start difference. First operand 63 states and 68 transitions. Second operand 20 states. [2018-10-24 12:16:27,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:27,279 INFO L93 Difference]: Finished difference Result 152 states and 176 transitions. [2018-10-24 12:16:27,280 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:16:27,280 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 49 [2018-10-24 12:16:27,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:27,281 INFO L225 Difference]: With dead ends: 152 [2018-10-24 12:16:27,282 INFO L226 Difference]: Without dead ends: 127 [2018-10-24 12:16:27,283 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 82 SyntacticMatches, 10 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=253, Invalid=869, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:16:27,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-24 12:16:27,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 63. [2018-10-24 12:16:27,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-24 12:16:27,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 68 transitions. [2018-10-24 12:16:27,296 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 68 transitions. Word has length 49 [2018-10-24 12:16:27,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:27,297 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 68 transitions. [2018-10-24 12:16:27,297 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:16:27,297 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 68 transitions. [2018-10-24 12:16:27,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 12:16:27,298 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:27,298 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:27,298 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:27,298 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:27,299 INFO L82 PathProgramCache]: Analyzing trace with hash 488662063, now seen corresponding path program 3 times [2018-10-24 12:16:27,299 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:27,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:27,300 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:27,300 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:27,300 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:27,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:27,512 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:16:27,512 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:27,512 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:27,512 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:27,512 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:27,512 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:27,512 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:27,522 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:27,522 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:27,540 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:27,540 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:27,543 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:27,727 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:16:27,727 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:27,883 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:16:27,905 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:27,905 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 19 [2018-10-24 12:16:27,905 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:27,906 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:16:27,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:16:27,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=263, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:16:27,906 INFO L87 Difference]: Start difference. First operand 63 states and 68 transitions. Second operand 19 states. [2018-10-24 12:16:28,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:28,700 INFO L93 Difference]: Finished difference Result 175 states and 205 transitions. [2018-10-24 12:16:28,700 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:16:28,700 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 49 [2018-10-24 12:16:28,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:28,702 INFO L225 Difference]: With dead ends: 175 [2018-10-24 12:16:28,702 INFO L226 Difference]: Without dead ends: 150 [2018-10-24 12:16:28,703 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 83 SyntacticMatches, 10 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=233, Invalid=759, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:16:28,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-10-24 12:16:28,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 66. [2018-10-24 12:16:28,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-24 12:16:28,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 72 transitions. [2018-10-24 12:16:28,720 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 72 transitions. Word has length 49 [2018-10-24 12:16:28,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:28,720 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 72 transitions. [2018-10-24 12:16:28,720 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:16:28,721 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 72 transitions. [2018-10-24 12:16:28,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-24 12:16:28,721 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:28,722 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:28,722 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:28,722 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:28,722 INFO L82 PathProgramCache]: Analyzing trace with hash -396473339, now seen corresponding path program 6 times [2018-10-24 12:16:28,722 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:28,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:28,723 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:28,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:28,724 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:28,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:28,882 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 25 proven. 28 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-24 12:16:28,882 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:28,882 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:28,882 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:28,882 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:28,882 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:28,882 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:28,890 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:28,890 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:28,922 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:28,922 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:28,924 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:28,958 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:16:28,958 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:29,061 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:16:29,083 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:29,083 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 12 [2018-10-24 12:16:29,083 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:29,084 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:16:29,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:16:29,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:16:29,084 INFO L87 Difference]: Start difference. First operand 66 states and 72 transitions. Second operand 12 states. [2018-10-24 12:16:29,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:29,244 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2018-10-24 12:16:29,244 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:16:29,244 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 51 [2018-10-24 12:16:29,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:29,245 INFO L225 Difference]: With dead ends: 76 [2018-10-24 12:16:29,245 INFO L226 Difference]: Without dead ends: 74 [2018-10-24 12:16:29,246 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 97 SyntacticMatches, 9 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:16:29,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-24 12:16:29,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2018-10-24 12:16:29,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-24 12:16:29,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 80 transitions. [2018-10-24 12:16:29,259 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 80 transitions. Word has length 51 [2018-10-24 12:16:29,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:29,259 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 80 transitions. [2018-10-24 12:16:29,259 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:16:29,259 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 80 transitions. [2018-10-24 12:16:29,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:16:29,260 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:29,260 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:29,260 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:29,260 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:29,261 INFO L82 PathProgramCache]: Analyzing trace with hash 928978729, now seen corresponding path program 7 times [2018-10-24 12:16:29,261 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:29,261 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:29,261 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:29,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:29,262 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:29,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:29,582 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:29,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:29,583 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:29,583 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:29,583 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:29,583 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:29,583 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:29,590 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:29,590 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:29,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:29,622 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:29,794 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:29,795 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:29,873 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:29,894 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:29,894 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 26 [2018-10-24 12:16:29,894 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:29,895 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:16:29,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:16:29,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=509, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:16:29,896 INFO L87 Difference]: Start difference. First operand 74 states and 80 transitions. Second operand 26 states. [2018-10-24 12:16:30,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:30,173 INFO L93 Difference]: Finished difference Result 133 states and 150 transitions. [2018-10-24 12:16:30,173 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:16:30,173 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2018-10-24 12:16:30,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:30,174 INFO L225 Difference]: With dead ends: 133 [2018-10-24 12:16:30,174 INFO L226 Difference]: Without dead ends: 104 [2018-10-24 12:16:30,176 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 96 SyntacticMatches, 12 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=315, Invalid=1091, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:16:30,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2018-10-24 12:16:30,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 76. [2018-10-24 12:16:30,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-10-24 12:16:30,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2018-10-24 12:16:30,190 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 59 [2018-10-24 12:16:30,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:30,190 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2018-10-24 12:16:30,190 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:16:30,190 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2018-10-24 12:16:30,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:16:30,191 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:30,191 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:30,191 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:30,192 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:30,192 INFO L82 PathProgramCache]: Analyzing trace with hash 277511861, now seen corresponding path program 4 times [2018-10-24 12:16:30,192 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:30,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:30,192 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:30,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:30,193 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:30,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:30,360 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 44 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:30,360 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:30,360 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:30,361 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:30,361 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:30,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:30,361 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:30,368 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:30,368 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:30,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:30,388 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:30,590 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 44 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:30,591 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:30,669 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 44 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:30,689 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:30,689 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 25 [2018-10-24 12:16:30,689 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:30,690 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:16:30,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:16:30,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=474, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:16:30,691 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 25 states. [2018-10-24 12:16:31,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:31,455 INFO L93 Difference]: Finished difference Result 161 states and 184 transitions. [2018-10-24 12:16:31,455 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:16:31,456 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 59 [2018-10-24 12:16:31,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:31,457 INFO L225 Difference]: With dead ends: 161 [2018-10-24 12:16:31,457 INFO L226 Difference]: Without dead ends: 132 [2018-10-24 12:16:31,458 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 97 SyntacticMatches, 12 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 570 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=351, Invalid=1289, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:16:31,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-10-24 12:16:31,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 76. [2018-10-24 12:16:31,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-10-24 12:16:31,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2018-10-24 12:16:31,473 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 59 [2018-10-24 12:16:31,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:31,474 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2018-10-24 12:16:31,474 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:16:31,474 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2018-10-24 12:16:31,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:16:31,474 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:31,474 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:31,475 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:31,475 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:31,475 INFO L82 PathProgramCache]: Analyzing trace with hash -129869503, now seen corresponding path program 5 times [2018-10-24 12:16:31,475 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:31,476 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:31,476 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:31,476 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:31,476 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:31,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:31,654 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 44 proven. 12 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:31,655 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:31,655 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:31,655 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:31,655 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:31,655 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:31,655 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:31,663 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:31,663 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:31,683 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-24 12:16:31,683 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:31,686 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:31,852 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 44 proven. 12 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:31,853 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:31,927 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 44 proven. 12 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:31,948 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:31,948 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 24 [2018-10-24 12:16:31,948 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:31,948 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:16:31,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:16:31,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:16:31,949 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 24 states. [2018-10-24 12:16:32,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:32,407 INFO L93 Difference]: Finished difference Result 187 states and 216 transitions. [2018-10-24 12:16:32,407 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:16:32,407 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 59 [2018-10-24 12:16:32,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:32,408 INFO L225 Difference]: With dead ends: 187 [2018-10-24 12:16:32,409 INFO L226 Difference]: Without dead ends: 158 [2018-10-24 12:16:32,410 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 98 SyntacticMatches, 12 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 573 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=364, Invalid=1358, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:16:32,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2018-10-24 12:16:32,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 76. [2018-10-24 12:16:32,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-10-24 12:16:32,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2018-10-24 12:16:32,428 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 59 [2018-10-24 12:16:32,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:32,429 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2018-10-24 12:16:32,429 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:16:32,429 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2018-10-24 12:16:32,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:16:32,430 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:32,430 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:32,430 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:32,430 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:32,430 INFO L82 PathProgramCache]: Analyzing trace with hash -49846579, now seen corresponding path program 6 times [2018-10-24 12:16:32,430 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:32,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:32,431 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:32,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:32,431 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:32,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:33,185 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 44 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:33,185 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:33,186 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:33,186 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:33,186 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:33,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:33,186 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:33,194 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:33,195 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:33,231 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:33,232 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:33,234 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:33,383 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 44 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:33,384 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:33,470 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 44 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:33,492 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:33,492 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2018-10-24 12:16:33,492 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:33,492 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:16:33,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:16:33,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=398, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:16:33,493 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 23 states. [2018-10-24 12:16:33,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:33,971 INFO L93 Difference]: Finished difference Result 211 states and 246 transitions. [2018-10-24 12:16:33,971 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 12:16:33,971 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 59 [2018-10-24 12:16:33,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:33,972 INFO L225 Difference]: With dead ends: 211 [2018-10-24 12:16:33,972 INFO L226 Difference]: Without dead ends: 182 [2018-10-24 12:16:33,973 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 99 SyntacticMatches, 12 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=351, Invalid=1289, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:16:33,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-10-24 12:16:33,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 76. [2018-10-24 12:16:33,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-10-24 12:16:33,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2018-10-24 12:16:33,993 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 59 [2018-10-24 12:16:33,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:33,994 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2018-10-24 12:16:33,994 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:16:33,994 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2018-10-24 12:16:33,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:16:33,995 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:33,995 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:33,995 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:33,995 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:33,995 INFO L82 PathProgramCache]: Analyzing trace with hash 1451911001, now seen corresponding path program 4 times [2018-10-24 12:16:33,995 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:33,996 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:33,996 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:33,996 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:33,996 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:34,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:34,135 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:34,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:34,135 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:34,135 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:34,135 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:34,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:34,136 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:34,143 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:34,143 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:34,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:34,160 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:34,304 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:34,304 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:34,568 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:34,588 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:34,589 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 22 [2018-10-24 12:16:34,589 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:34,589 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:16:34,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:16:34,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:16:34,590 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 22 states. [2018-10-24 12:16:35,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:35,084 INFO L93 Difference]: Finished difference Result 238 states and 280 transitions. [2018-10-24 12:16:35,085 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:16:35,085 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 59 [2018-10-24 12:16:35,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:35,086 INFO L225 Difference]: With dead ends: 238 [2018-10-24 12:16:35,086 INFO L226 Difference]: Without dead ends: 209 [2018-10-24 12:16:35,087 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 100 SyntacticMatches, 12 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 426 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=315, Invalid=1091, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:16:35,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2018-10-24 12:16:35,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 79. [2018-10-24 12:16:35,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-24 12:16:35,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 86 transitions. [2018-10-24 12:16:35,115 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 86 transitions. Word has length 59 [2018-10-24 12:16:35,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:35,115 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 86 transitions. [2018-10-24 12:16:35,115 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:16:35,115 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 86 transitions. [2018-10-24 12:16:35,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-24 12:16:35,116 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:35,116 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:35,116 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:35,117 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:35,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1954413347, now seen corresponding path program 8 times [2018-10-24 12:16:35,117 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:35,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:35,118 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:35,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:35,118 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:35,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:35,282 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 37 proven. 46 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:16:35,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:35,282 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:35,283 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:35,283 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:35,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:35,283 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:35,291 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:35,291 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:35,313 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:16:35,313 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:35,315 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:35,357 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:35,357 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:35,421 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:16:35,442 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:35,442 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 13 [2018-10-24 12:16:35,442 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:35,442 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:16:35,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:16:35,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:16:35,443 INFO L87 Difference]: Start difference. First operand 79 states and 86 transitions. Second operand 13 states. [2018-10-24 12:16:35,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:35,571 INFO L93 Difference]: Finished difference Result 89 states and 96 transitions. [2018-10-24 12:16:35,572 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:16:35,572 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2018-10-24 12:16:35,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:35,573 INFO L225 Difference]: With dead ends: 89 [2018-10-24 12:16:35,573 INFO L226 Difference]: Without dead ends: 87 [2018-10-24 12:16:35,574 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 116 SyntacticMatches, 11 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:16:35,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-24 12:16:35,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-10-24 12:16:35,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-10-24 12:16:35,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 94 transitions. [2018-10-24 12:16:35,595 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 94 transitions. Word has length 61 [2018-10-24 12:16:35,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:35,596 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 94 transitions. [2018-10-24 12:16:35,596 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:16:35,596 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 94 transitions. [2018-10-24 12:16:35,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-24 12:16:35,597 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:35,597 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:35,597 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:35,597 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:35,597 INFO L82 PathProgramCache]: Analyzing trace with hash 1550108743, now seen corresponding path program 9 times [2018-10-24 12:16:35,597 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:35,598 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:35,598 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:35,598 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:35,598 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:35,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:35,778 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:35,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:35,778 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:35,778 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:35,778 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:35,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:35,778 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:35,787 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:35,787 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:35,808 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:35,809 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:35,810 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:36,217 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:36,217 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:36,319 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:36,340 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:36,340 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 30 [2018-10-24 12:16:36,340 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:36,341 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:16:36,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:16:36,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=685, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:16:36,342 INFO L87 Difference]: Start difference. First operand 87 states and 94 transitions. Second operand 30 states. [2018-10-24 12:16:36,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:36,773 INFO L93 Difference]: Finished difference Result 156 states and 176 transitions. [2018-10-24 12:16:36,776 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:16:36,776 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 69 [2018-10-24 12:16:36,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:36,777 INFO L225 Difference]: With dead ends: 156 [2018-10-24 12:16:36,777 INFO L226 Difference]: Without dead ends: 123 [2018-10-24 12:16:36,778 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 112 SyntacticMatches, 14 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 755 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=409, Invalid=1483, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:16:36,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-24 12:16:36,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 89. [2018-10-24 12:16:36,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-24 12:16:36,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2018-10-24 12:16:36,804 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 69 [2018-10-24 12:16:36,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:36,804 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2018-10-24 12:16:36,804 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:16:36,804 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2018-10-24 12:16:36,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-24 12:16:36,805 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:36,805 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:36,805 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:36,806 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:36,806 INFO L82 PathProgramCache]: Analyzing trace with hash 1825386707, now seen corresponding path program 7 times [2018-10-24 12:16:36,806 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:36,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:36,806 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:36,807 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:36,807 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:36,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:37,018 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:37,018 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:37,018 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:37,018 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:37,019 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:37,019 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:37,019 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:37,027 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:37,027 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:37,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:37,046 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:37,281 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:37,281 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:37,572 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:37,592 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:37,593 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 29 [2018-10-24 12:16:37,593 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:37,593 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:16:37,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:16:37,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:16:37,594 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 29 states. [2018-10-24 12:16:38,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:38,130 INFO L93 Difference]: Finished difference Result 190 states and 217 transitions. [2018-10-24 12:16:38,130 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:16:38,130 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 69 [2018-10-24 12:16:38,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:38,131 INFO L225 Difference]: With dead ends: 190 [2018-10-24 12:16:38,131 INFO L226 Difference]: Without dead ends: 157 [2018-10-24 12:16:38,132 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 113 SyntacticMatches, 14 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 837 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=465, Invalid=1791, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:16:38,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-24 12:16:38,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 89. [2018-10-24 12:16:38,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-24 12:16:38,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2018-10-24 12:16:38,162 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 69 [2018-10-24 12:16:38,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:38,162 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2018-10-24 12:16:38,162 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:16:38,162 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2018-10-24 12:16:38,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-24 12:16:38,163 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:38,163 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:38,163 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:38,163 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:38,164 INFO L82 PathProgramCache]: Analyzing trace with hash -1995551649, now seen corresponding path program 8 times [2018-10-24 12:16:38,164 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:38,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:38,164 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:38,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:38,165 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:38,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:38,335 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 65 proven. 18 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:38,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:38,335 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:38,335 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:38,335 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:38,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:38,335 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:38,342 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:38,342 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:38,366 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:16:38,367 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:38,369 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:38,623 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 65 proven. 18 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:38,623 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:38,738 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 65 proven. 18 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:38,759 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:38,759 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 28 [2018-10-24 12:16:38,759 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:38,759 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:16:38,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:16:38,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=603, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:16:38,760 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 28 states. [2018-10-24 12:16:39,105 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-24 12:16:39,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:39,710 INFO L93 Difference]: Finished difference Result 222 states and 256 transitions. [2018-10-24 12:16:39,710 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:16:39,710 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 69 [2018-10-24 12:16:39,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:39,711 INFO L225 Difference]: With dead ends: 222 [2018-10-24 12:16:39,711 INFO L226 Difference]: Without dead ends: 189 [2018-10-24 12:16:39,712 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 114 SyntacticMatches, 14 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 873 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=496, Invalid=1954, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:16:39,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2018-10-24 12:16:39,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 89. [2018-10-24 12:16:39,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-24 12:16:39,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2018-10-24 12:16:39,752 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 69 [2018-10-24 12:16:39,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:39,753 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2018-10-24 12:16:39,753 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:16:39,753 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2018-10-24 12:16:39,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-24 12:16:39,754 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:39,754 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:39,754 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:39,754 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:39,754 INFO L82 PathProgramCache]: Analyzing trace with hash 632871659, now seen corresponding path program 9 times [2018-10-24 12:16:39,754 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:39,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:39,755 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:39,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:39,755 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:39,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:39,929 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 65 proven. 18 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:39,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:39,929 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:39,929 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:39,929 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:39,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:39,929 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:39,938 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:39,938 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:39,958 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:39,958 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:39,960 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:40,169 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 65 proven. 18 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:40,169 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:40,269 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 65 proven. 18 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:40,291 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:40,291 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 27 [2018-10-24 12:16:40,291 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:40,291 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:16:40,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:16:40,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=559, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:16:40,292 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 27 states. [2018-10-24 12:16:41,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:41,281 INFO L93 Difference]: Finished difference Result 252 states and 293 transitions. [2018-10-24 12:16:41,282 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:16:41,282 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 69 [2018-10-24 12:16:41,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:41,283 INFO L225 Difference]: With dead ends: 252 [2018-10-24 12:16:41,284 INFO L226 Difference]: Without dead ends: 219 [2018-10-24 12:16:41,285 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 115 SyntacticMatches, 14 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 849 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=496, Invalid=1954, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:16:41,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-10-24 12:16:41,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 89. [2018-10-24 12:16:41,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-24 12:16:41,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2018-10-24 12:16:41,317 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 69 [2018-10-24 12:16:41,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:41,317 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2018-10-24 12:16:41,317 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:16:41,317 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2018-10-24 12:16:41,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-24 12:16:41,318 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:41,318 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:41,318 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:41,318 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:41,318 INFO L82 PathProgramCache]: Analyzing trace with hash 613260407, now seen corresponding path program 10 times [2018-10-24 12:16:41,319 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:41,319 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:41,319 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:41,319 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:41,320 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:41,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:42,173 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:42,173 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:42,173 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:42,173 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:42,173 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:42,173 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:42,173 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:42,182 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:42,182 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:42,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:42,205 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:42,364 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:42,364 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:42,535 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:42,556 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:42,556 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2018-10-24 12:16:42,556 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:42,556 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:16:42,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:16:42,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=513, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:16:42,557 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 26 states. [2018-10-24 12:16:43,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:43,115 INFO L93 Difference]: Finished difference Result 280 states and 328 transitions. [2018-10-24 12:16:43,116 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:16:43,116 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 69 [2018-10-24 12:16:43,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:43,117 INFO L225 Difference]: With dead ends: 280 [2018-10-24 12:16:43,117 INFO L226 Difference]: Without dead ends: 247 [2018-10-24 12:16:43,118 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 116 SyntacticMatches, 14 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 759 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=465, Invalid=1791, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:16:43,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-10-24 12:16:43,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 89. [2018-10-24 12:16:43,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-24 12:16:43,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2018-10-24 12:16:43,155 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 69 [2018-10-24 12:16:43,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:43,155 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2018-10-24 12:16:43,155 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:16:43,155 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2018-10-24 12:16:43,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-24 12:16:43,156 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:43,156 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:43,156 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:43,156 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:43,156 INFO L82 PathProgramCache]: Analyzing trace with hash 1618825475, now seen corresponding path program 5 times [2018-10-24 12:16:43,157 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:43,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:43,157 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:43,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:43,158 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:43,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:43,611 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:43,611 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:43,611 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:43,612 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:43,612 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:43,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:43,612 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:43,621 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:43,621 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:43,647 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:16:43,648 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:43,649 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:43,791 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:43,791 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:43,892 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:43,912 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:43,913 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 25 [2018-10-24 12:16:43,913 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:43,913 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:16:43,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:16:43,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=465, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:16:43,914 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 25 states. [2018-10-24 12:16:44,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:44,617 INFO L93 Difference]: Finished difference Result 311 states and 367 transitions. [2018-10-24 12:16:44,618 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:16:44,618 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 69 [2018-10-24 12:16:44,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:44,620 INFO L225 Difference]: With dead ends: 311 [2018-10-24 12:16:44,620 INFO L226 Difference]: Without dead ends: 278 [2018-10-24 12:16:44,621 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 117 SyntacticMatches, 14 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 605 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=409, Invalid=1483, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:16:44,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2018-10-24 12:16:44,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 92. [2018-10-24 12:16:44,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-10-24 12:16:44,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 100 transitions. [2018-10-24 12:16:44,671 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 100 transitions. Word has length 69 [2018-10-24 12:16:44,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:44,672 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 100 transitions. [2018-10-24 12:16:44,672 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:16:44,672 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 100 transitions. [2018-10-24 12:16:44,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-24 12:16:44,673 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:44,673 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:44,673 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:44,673 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:44,673 INFO L82 PathProgramCache]: Analyzing trace with hash 2111470529, now seen corresponding path program 10 times [2018-10-24 12:16:44,673 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:44,674 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:44,674 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:44,674 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:44,674 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:44,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:45,167 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 51 proven. 68 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-24 12:16:45,167 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:45,167 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:45,168 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:45,168 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:45,168 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:45,168 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:45,175 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:45,175 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:45,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:45,200 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:45,628 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:45,629 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:46,477 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:16:46,498 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:46,498 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 14 [2018-10-24 12:16:46,498 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:46,498 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:16:46,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:16:46,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:16:46,499 INFO L87 Difference]: Start difference. First operand 92 states and 100 transitions. Second operand 14 states. [2018-10-24 12:16:46,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:46,660 INFO L93 Difference]: Finished difference Result 102 states and 110 transitions. [2018-10-24 12:16:46,661 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:16:46,661 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 71 [2018-10-24 12:16:46,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:46,662 INFO L225 Difference]: With dead ends: 102 [2018-10-24 12:16:46,662 INFO L226 Difference]: Without dead ends: 100 [2018-10-24 12:16:46,663 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 135 SyntacticMatches, 13 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:16:46,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-24 12:16:46,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2018-10-24 12:16:46,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-10-24 12:16:46,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 108 transitions. [2018-10-24 12:16:46,692 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 108 transitions. Word has length 71 [2018-10-24 12:16:46,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:46,692 INFO L481 AbstractCegarLoop]: Abstraction has 100 states and 108 transitions. [2018-10-24 12:16:46,692 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:16:46,692 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 108 transitions. [2018-10-24 12:16:46,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-24 12:16:46,693 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:46,693 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:46,693 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:46,694 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:46,694 INFO L82 PathProgramCache]: Analyzing trace with hash 58575589, now seen corresponding path program 11 times [2018-10-24 12:16:46,694 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:46,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:46,695 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:46,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:46,695 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:46,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:46,879 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:46,880 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:46,880 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:46,880 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:46,880 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:46,880 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:46,880 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:46,887 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:46,887 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:46,917 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-24 12:16:46,917 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:46,919 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:47,232 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:47,232 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:47,352 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:47,373 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:47,373 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 34 [2018-10-24 12:16:47,373 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:47,374 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:16:47,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:16:47,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=887, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:16:47,375 INFO L87 Difference]: Start difference. First operand 100 states and 108 transitions. Second operand 34 states. [2018-10-24 12:16:48,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:48,141 INFO L93 Difference]: Finished difference Result 179 states and 202 transitions. [2018-10-24 12:16:48,142 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:16:48,142 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 79 [2018-10-24 12:16:48,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:48,143 INFO L225 Difference]: With dead ends: 179 [2018-10-24 12:16:48,143 INFO L226 Difference]: Without dead ends: 142 [2018-10-24 12:16:48,144 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 128 SyntacticMatches, 16 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1025 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=515, Invalid=1935, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:16:48,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-10-24 12:16:48,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 102. [2018-10-24 12:16:48,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-24 12:16:48,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 110 transitions. [2018-10-24 12:16:48,180 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 110 transitions. Word has length 79 [2018-10-24 12:16:48,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:48,181 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 110 transitions. [2018-10-24 12:16:48,181 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:16:48,181 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 110 transitions. [2018-10-24 12:16:48,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-24 12:16:48,181 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:48,181 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:48,182 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:48,182 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:48,182 INFO L82 PathProgramCache]: Analyzing trace with hash 127267953, now seen corresponding path program 11 times [2018-10-24 12:16:48,182 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:48,182 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:48,183 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:48,183 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:48,183 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:48,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:48,416 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 90 proven. 32 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:48,416 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:48,416 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:48,416 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:48,416 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:48,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:48,417 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:48,426 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:48,427 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:48,453 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-24 12:16:48,454 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:48,456 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:48,821 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 90 proven. 32 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:48,821 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:48,974 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 90 proven. 32 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:48,994 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:48,994 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 33 [2018-10-24 12:16:48,995 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:48,995 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:16:48,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:16:48,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=842, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:16:48,996 INFO L87 Difference]: Start difference. First operand 102 states and 110 transitions. Second operand 33 states. [2018-10-24 12:16:49,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:49,769 INFO L93 Difference]: Finished difference Result 219 states and 250 transitions. [2018-10-24 12:16:49,769 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:16:49,769 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 79 [2018-10-24 12:16:49,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:49,771 INFO L225 Difference]: With dead ends: 219 [2018-10-24 12:16:49,771 INFO L226 Difference]: Without dead ends: 182 [2018-10-24 12:16:49,772 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 129 SyntacticMatches, 16 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1155 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=595, Invalid=2375, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:16:49,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-10-24 12:16:49,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 102. [2018-10-24 12:16:49,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-24 12:16:49,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 110 transitions. [2018-10-24 12:16:49,815 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 110 transitions. Word has length 79 [2018-10-24 12:16:49,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:49,815 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 110 transitions. [2018-10-24 12:16:49,816 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:16:49,816 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 110 transitions. [2018-10-24 12:16:49,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-24 12:16:49,816 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:49,816 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:49,816 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:49,816 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:49,816 INFO L82 PathProgramCache]: Analyzing trace with hash 310579453, now seen corresponding path program 12 times [2018-10-24 12:16:49,817 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:49,817 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:49,817 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:49,817 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:49,817 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:49,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:50,107 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 90 proven. 26 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:50,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:50,108 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:50,108 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:50,108 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:50,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:50,108 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:50,116 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:50,116 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:50,138 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:50,138 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:50,140 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:50,434 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 90 proven. 26 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:50,434 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:50,596 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 90 proven. 26 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:50,616 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:50,617 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 32 [2018-10-24 12:16:50,617 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:50,617 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:16:50,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:16:50,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=795, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:16:50,618 INFO L87 Difference]: Start difference. First operand 102 states and 110 transitions. Second operand 32 states. [2018-10-24 12:16:51,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:51,876 INFO L93 Difference]: Finished difference Result 257 states and 296 transitions. [2018-10-24 12:16:51,876 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:16:51,877 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 79 [2018-10-24 12:16:51,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:51,879 INFO L225 Difference]: With dead ends: 257 [2018-10-24 12:16:51,880 INFO L226 Difference]: Without dead ends: 220 [2018-10-24 12:16:51,882 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 130 SyntacticMatches, 16 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1236 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=649, Invalid=2657, Unknown=0, NotChecked=0, Total=3306 [2018-10-24 12:16:51,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-10-24 12:16:51,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 102. [2018-10-24 12:16:51,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-24 12:16:51,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 110 transitions. [2018-10-24 12:16:51,949 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 110 transitions. Word has length 79 [2018-10-24 12:16:51,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:51,949 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 110 transitions. [2018-10-24 12:16:51,949 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:16:51,949 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 110 transitions. [2018-10-24 12:16:51,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-24 12:16:51,950 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:51,950 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:51,950 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:51,950 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:51,951 INFO L82 PathProgramCache]: Analyzing trace with hash -1427775351, now seen corresponding path program 13 times [2018-10-24 12:16:51,951 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:51,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:51,951 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:51,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:51,952 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:51,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:52,978 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 90 proven. 24 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:52,978 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:52,978 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:52,979 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:52,979 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:52,979 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:52,979 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:52,986 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:52,987 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:53,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:53,021 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:53,277 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 90 proven. 24 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:53,277 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:53,386 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 90 proven. 24 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:53,407 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:53,407 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 31 [2018-10-24 12:16:53,408 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:53,408 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:16:53,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:16:53,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=746, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:16:53,409 INFO L87 Difference]: Start difference. First operand 102 states and 110 transitions. Second operand 31 states. [2018-10-24 12:16:54,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:54,172 INFO L93 Difference]: Finished difference Result 293 states and 340 transitions. [2018-10-24 12:16:54,172 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:16:54,172 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 79 [2018-10-24 12:16:54,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:54,174 INFO L225 Difference]: With dead ends: 293 [2018-10-24 12:16:54,174 INFO L226 Difference]: Without dead ends: 256 [2018-10-24 12:16:54,175 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 131 SyntacticMatches, 16 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1248 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=668, Invalid=2754, Unknown=0, NotChecked=0, Total=3422 [2018-10-24 12:16:54,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2018-10-24 12:16:54,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 102. [2018-10-24 12:16:54,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-24 12:16:54,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 110 transitions. [2018-10-24 12:16:54,237 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 110 transitions. Word has length 79 [2018-10-24 12:16:54,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:54,238 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 110 transitions. [2018-10-24 12:16:54,238 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:16:54,238 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 110 transitions. [2018-10-24 12:16:54,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-24 12:16:54,238 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:54,239 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:54,239 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:54,239 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:54,239 INFO L82 PathProgramCache]: Analyzing trace with hash 143598357, now seen corresponding path program 14 times [2018-10-24 12:16:54,239 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:54,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:54,240 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:54,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:54,240 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:54,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:54,564 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 90 proven. 26 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:54,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:54,565 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:54,565 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:54,565 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:54,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:54,565 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:54,572 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:54,572 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:54,604 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-24 12:16:54,604 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:54,607 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:54,810 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 90 proven. 26 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:54,810 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:55,275 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 90 proven. 26 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:55,295 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:55,295 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 30 [2018-10-24 12:16:55,295 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:55,296 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:16:55,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:16:55,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=695, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:16:55,296 INFO L87 Difference]: Start difference. First operand 102 states and 110 transitions. Second operand 30 states. [2018-10-24 12:16:56,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:56,144 INFO L93 Difference]: Finished difference Result 327 states and 382 transitions. [2018-10-24 12:16:56,144 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:16:56,145 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 79 [2018-10-24 12:16:56,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:56,146 INFO L225 Difference]: With dead ends: 327 [2018-10-24 12:16:56,146 INFO L226 Difference]: Without dead ends: 290 [2018-10-24 12:16:56,147 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 132 SyntacticMatches, 16 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1182 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=649, Invalid=2657, Unknown=0, NotChecked=0, Total=3306 [2018-10-24 12:16:56,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2018-10-24 12:16:56,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 102. [2018-10-24 12:16:56,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-24 12:16:56,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 110 transitions. [2018-10-24 12:16:56,200 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 110 transitions. Word has length 79 [2018-10-24 12:16:56,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:56,200 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 110 transitions. [2018-10-24 12:16:56,200 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:16:56,200 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 110 transitions. [2018-10-24 12:16:56,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-24 12:16:56,201 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:56,201 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:56,201 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:56,201 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:56,201 INFO L82 PathProgramCache]: Analyzing trace with hash -1602250591, now seen corresponding path program 15 times [2018-10-24 12:16:56,201 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:56,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:56,202 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:56,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:56,202 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:56,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:56,418 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 90 proven. 32 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:56,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:56,418 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:56,418 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:56,418 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:56,419 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:56,419 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:56,425 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:56,426 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:56,450 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:56,450 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:56,452 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:56,647 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 90 proven. 32 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:56,647 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:56,770 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 90 proven. 32 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:56,790 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:56,790 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2018-10-24 12:16:56,790 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:56,791 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:16:56,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:16:56,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=642, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:16:56,792 INFO L87 Difference]: Start difference. First operand 102 states and 110 transitions. Second operand 29 states. [2018-10-24 12:16:57,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:57,598 INFO L93 Difference]: Finished difference Result 359 states and 422 transitions. [2018-10-24 12:16:57,600 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:16:57,600 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 79 [2018-10-24 12:16:57,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:57,602 INFO L225 Difference]: With dead ends: 359 [2018-10-24 12:16:57,602 INFO L226 Difference]: Without dead ends: 322 [2018-10-24 12:16:57,603 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 133 SyntacticMatches, 16 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1035 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=595, Invalid=2375, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:16:57,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2018-10-24 12:16:57,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 102. [2018-10-24 12:16:57,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-24 12:16:57,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 110 transitions. [2018-10-24 12:16:57,668 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 110 transitions. Word has length 79 [2018-10-24 12:16:57,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:57,668 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 110 transitions. [2018-10-24 12:16:57,669 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:16:57,669 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 110 transitions. [2018-10-24 12:16:57,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-24 12:16:57,669 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:57,669 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:57,670 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:57,670 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:57,670 INFO L82 PathProgramCache]: Analyzing trace with hash -1326972627, now seen corresponding path program 6 times [2018-10-24 12:16:57,670 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:57,671 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:57,671 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:57,671 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:57,671 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:57,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:58,666 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:58,666 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:58,666 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:58,666 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:58,666 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:58,666 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:58,667 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:58,673 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:58,674 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:58,697 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:58,698 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:58,699 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:58,883 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:58,883 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:58,989 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:16:59,008 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:59,009 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 28 [2018-10-24 12:16:59,009 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:59,009 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:16:59,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:16:59,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=587, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:16:59,010 INFO L87 Difference]: Start difference. First operand 102 states and 110 transitions. Second operand 28 states. [2018-10-24 12:16:59,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:59,801 INFO L93 Difference]: Finished difference Result 394 states and 466 transitions. [2018-10-24 12:16:59,801 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:16:59,802 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 79 [2018-10-24 12:16:59,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:59,803 INFO L225 Difference]: With dead ends: 394 [2018-10-24 12:16:59,804 INFO L226 Difference]: Without dead ends: 357 [2018-10-24 12:16:59,804 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 134 SyntacticMatches, 16 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 815 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=515, Invalid=1935, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:16:59,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2018-10-24 12:16:59,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 105. [2018-10-24 12:16:59,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-10-24 12:16:59,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 114 transitions. [2018-10-24 12:16:59,859 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 114 transitions. Word has length 79 [2018-10-24 12:16:59,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:59,859 INFO L481 AbstractCegarLoop]: Abstraction has 105 states and 114 transitions. [2018-10-24 12:16:59,859 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:16:59,860 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 114 transitions. [2018-10-24 12:16:59,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-10-24 12:16:59,860 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:59,860 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:59,860 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:59,860 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:59,861 INFO L82 PathProgramCache]: Analyzing trace with hash 1957490143, now seen corresponding path program 12 times [2018-10-24 12:16:59,861 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:59,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:59,861 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:59,862 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:59,862 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:59,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:00,178 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 67 proven. 94 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-24 12:17:00,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:00,178 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:00,179 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:00,179 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:00,179 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:00,179 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:00,186 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:17:00,186 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:17:00,209 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:17:00,209 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:00,211 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:00,267 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:17:00,268 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:00,384 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:17:00,404 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:00,404 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 15 [2018-10-24 12:17:00,404 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:00,404 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:17:00,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:17:00,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:17:00,405 INFO L87 Difference]: Start difference. First operand 105 states and 114 transitions. Second operand 15 states. [2018-10-24 12:17:00,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:00,726 INFO L93 Difference]: Finished difference Result 115 states and 124 transitions. [2018-10-24 12:17:00,726 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:17:00,726 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 81 [2018-10-24 12:17:00,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:00,728 INFO L225 Difference]: With dead ends: 115 [2018-10-24 12:17:00,728 INFO L226 Difference]: Without dead ends: 113 [2018-10-24 12:17:00,728 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 154 SyntacticMatches, 15 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:17:00,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2018-10-24 12:17:00,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2018-10-24 12:17:00,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2018-10-24 12:17:00,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 122 transitions. [2018-10-24 12:17:00,797 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 122 transitions. Word has length 81 [2018-10-24 12:17:00,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:00,798 INFO L481 AbstractCegarLoop]: Abstraction has 113 states and 122 transitions. [2018-10-24 12:17:00,798 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:17:00,798 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 122 transitions. [2018-10-24 12:17:00,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:17:00,799 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:00,799 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:00,799 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:00,800 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:00,800 INFO L82 PathProgramCache]: Analyzing trace with hash -507298045, now seen corresponding path program 13 times [2018-10-24 12:17:00,800 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:00,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:00,801 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:00,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:00,801 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:00,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:01,343 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:01,343 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:01,343 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:01,343 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:01,344 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:01,344 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:01,344 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:01,350 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:01,351 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:17:01,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:01,376 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:01,715 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:01,716 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:01,903 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:01,924 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:01,924 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 38 [2018-10-24 12:17:01,924 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:01,925 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:17:01,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:17:01,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=1115, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:17:01,925 INFO L87 Difference]: Start difference. First operand 113 states and 122 transitions. Second operand 38 states. [2018-10-24 12:17:02,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:02,625 INFO L93 Difference]: Finished difference Result 202 states and 228 transitions. [2018-10-24 12:17:02,625 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:17:02,625 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 89 [2018-10-24 12:17:02,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:02,626 INFO L225 Difference]: With dead ends: 202 [2018-10-24 12:17:02,626 INFO L226 Difference]: Without dead ends: 161 [2018-10-24 12:17:02,627 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 144 SyntacticMatches, 18 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1336 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=633, Invalid=2447, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:17:02,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2018-10-24 12:17:02,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 115. [2018-10-24 12:17:02,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-24 12:17:02,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-10-24 12:17:02,694 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-10-24 12:17:02,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:02,694 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-10-24 12:17:02,694 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:17:02,695 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-10-24 12:17:02,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:17:02,695 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:02,695 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:02,696 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:02,696 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:02,696 INFO L82 PathProgramCache]: Analyzing trace with hash -1248990833, now seen corresponding path program 16 times [2018-10-24 12:17:02,696 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:02,697 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:02,697 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:02,697 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:02,697 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:02,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:02,957 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 119 proven. 44 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:02,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:02,958 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:02,958 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:02,958 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:02,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:02,958 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:02,970 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:02,970 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:17:02,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:02,999 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:03,345 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 119 proven. 44 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:03,345 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:03,483 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 119 proven. 44 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:03,503 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:03,503 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 37 [2018-10-24 12:17:03,503 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:03,503 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-24 12:17:03,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-24 12:17:03,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=267, Invalid=1065, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:17:03,504 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 37 states. [2018-10-24 12:17:04,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:04,352 INFO L93 Difference]: Finished difference Result 248 states and 283 transitions. [2018-10-24 12:17:04,352 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:17:04,352 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 89 [2018-10-24 12:17:04,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:04,353 INFO L225 Difference]: With dead ends: 248 [2018-10-24 12:17:04,353 INFO L226 Difference]: Without dead ends: 207 [2018-10-24 12:17:04,354 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 145 SyntacticMatches, 18 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1524 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=741, Invalid=3041, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:17:04,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2018-10-24 12:17:04,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 115. [2018-10-24 12:17:04,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-24 12:17:04,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-10-24 12:17:04,421 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-10-24 12:17:04,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:04,421 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-10-24 12:17:04,422 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-24 12:17:04,422 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-10-24 12:17:04,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:17:04,422 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:04,422 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 6, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:04,423 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:04,423 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:04,423 INFO L82 PathProgramCache]: Analyzing trace with hash 752469787, now seen corresponding path program 17 times [2018-10-24 12:17:04,423 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:04,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:04,424 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:04,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:04,424 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:04,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:05,731 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 119 proven. 36 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:05,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:05,732 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:05,732 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:05,732 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:05,732 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:05,732 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:05,739 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:17:05,740 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:17:05,868 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-24 12:17:05,868 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:05,871 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:06,293 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 119 proven. 36 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:06,293 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:06,428 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 119 proven. 36 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:06,448 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:06,449 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 36 [2018-10-24 12:17:06,449 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:06,449 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:17:06,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:17:06,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=1013, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:17:06,450 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 36 states. [2018-10-24 12:17:07,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:07,534 INFO L93 Difference]: Finished difference Result 292 states and 336 transitions. [2018-10-24 12:17:07,534 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:17:07,534 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 89 [2018-10-24 12:17:07,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:07,536 INFO L225 Difference]: With dead ends: 292 [2018-10-24 12:17:07,536 INFO L226 Difference]: Without dead ends: 251 [2018-10-24 12:17:07,537 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 146 SyntacticMatches, 18 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1662 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=823, Invalid=3467, Unknown=0, NotChecked=0, Total=4290 [2018-10-24 12:17:07,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2018-10-24 12:17:07,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 115. [2018-10-24 12:17:07,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-24 12:17:07,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-10-24 12:17:07,606 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-10-24 12:17:07,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:07,606 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-10-24 12:17:07,606 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:17:07,606 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-10-24 12:17:07,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:17:07,607 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:07,607 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:07,607 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:07,607 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:07,607 INFO L82 PathProgramCache]: Analyzing trace with hash -1940416601, now seen corresponding path program 18 times [2018-10-24 12:17:07,608 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:07,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:07,608 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:07,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:07,609 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:07,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:07,861 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 119 proven. 32 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:07,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:07,862 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:07,862 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:07,862 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:07,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:07,862 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:07,869 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:17:07,870 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:17:07,896 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:17:07,896 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:07,901 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:08,239 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 119 proven. 32 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:08,239 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:08,376 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 119 proven. 32 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:08,397 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:08,397 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 35 [2018-10-24 12:17:08,397 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:08,398 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 12:17:08,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 12:17:08,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=959, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:17:08,399 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 35 states. [2018-10-24 12:17:09,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:09,561 INFO L93 Difference]: Finished difference Result 334 states and 387 transitions. [2018-10-24 12:17:09,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:17:09,562 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 89 [2018-10-24 12:17:09,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:09,563 INFO L225 Difference]: With dead ends: 334 [2018-10-24 12:17:09,563 INFO L226 Difference]: Without dead ends: 293 [2018-10-24 12:17:09,564 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 147 SyntacticMatches, 18 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1724 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=867, Invalid=3689, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:17:09,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2018-10-24 12:17:09,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 115. [2018-10-24 12:17:09,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-24 12:17:09,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-10-24 12:17:09,637 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-10-24 12:17:09,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:09,637 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-10-24 12:17:09,637 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 12:17:09,637 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-10-24 12:17:09,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:17:09,638 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:09,638 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:09,639 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:09,639 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:09,639 INFO L82 PathProgramCache]: Analyzing trace with hash 233315123, now seen corresponding path program 19 times [2018-10-24 12:17:09,639 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:09,639 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:09,640 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:09,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:09,640 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:09,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:09,845 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 119 proven. 32 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:09,845 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:09,845 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:09,845 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:09,845 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:09,845 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:09,846 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:09,854 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:09,854 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:17:09,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:09,883 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:10,151 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 119 proven. 32 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:10,152 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:10,608 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 119 proven. 32 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:10,628 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:10,628 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 34 [2018-10-24 12:17:10,629 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:10,629 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:17:10,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:17:10,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=903, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:17:10,629 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 34 states. [2018-10-24 12:17:11,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:11,765 INFO L93 Difference]: Finished difference Result 374 states and 436 transitions. [2018-10-24 12:17:11,765 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:17:11,765 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 89 [2018-10-24 12:17:11,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:11,767 INFO L225 Difference]: With dead ends: 374 [2018-10-24 12:17:11,767 INFO L226 Difference]: Without dead ends: 333 [2018-10-24 12:17:11,768 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 148 SyntacticMatches, 18 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1696 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=867, Invalid=3689, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:17:11,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2018-10-24 12:17:11,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 115. [2018-10-24 12:17:11,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-24 12:17:11,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-10-24 12:17:11,868 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-10-24 12:17:11,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:11,868 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-10-24 12:17:11,869 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:17:11,869 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-10-24 12:17:11,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:17:11,869 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:11,869 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 6, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:11,870 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:11,870 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:11,870 INFO L82 PathProgramCache]: Analyzing trace with hash 1822167487, now seen corresponding path program 20 times [2018-10-24 12:17:11,870 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:11,871 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:11,871 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:11,871 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:11,871 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:11,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:12,110 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 119 proven. 36 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:12,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:12,111 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:12,111 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:12,111 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:12,111 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:12,111 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:12,118 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:17:12,119 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:17:12,160 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-24 12:17:12,160 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:12,162 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:12,514 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 119 proven. 36 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:12,515 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:12,683 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 119 proven. 36 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:12,703 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:12,703 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 33 [2018-10-24 12:17:12,703 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:12,704 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:17:12,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:17:12,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=845, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:17:12,704 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 33 states. [2018-10-24 12:17:13,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:13,840 INFO L93 Difference]: Finished difference Result 412 states and 483 transitions. [2018-10-24 12:17:13,840 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:17:13,840 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 89 [2018-10-24 12:17:13,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:13,842 INFO L225 Difference]: With dead ends: 412 [2018-10-24 12:17:13,842 INFO L226 Difference]: Without dead ends: 371 [2018-10-24 12:17:13,843 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 149 SyntacticMatches, 18 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1572 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=823, Invalid=3467, Unknown=0, NotChecked=0, Total=4290 [2018-10-24 12:17:13,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2018-10-24 12:17:13,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 115. [2018-10-24 12:17:13,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-24 12:17:13,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-10-24 12:17:13,917 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-10-24 12:17:13,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:13,917 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-10-24 12:17:13,917 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:17:13,917 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-10-24 12:17:13,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:17:13,918 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:13,918 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:13,918 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:13,918 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:13,918 INFO L82 PathProgramCache]: Analyzing trace with hash 1890859851, now seen corresponding path program 21 times [2018-10-24 12:17:13,919 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:13,919 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:13,919 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:13,919 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:13,919 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:13,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:14,226 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 119 proven. 44 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:14,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:14,227 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:14,227 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:14,227 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:14,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:14,227 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:14,234 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:17:14,234 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:17:14,262 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:17:14,262 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:14,264 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:14,508 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 119 proven. 44 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:14,508 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:14,755 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 119 proven. 44 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:14,775 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:14,775 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2018-10-24 12:17:14,775 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:14,776 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:17:14,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:17:14,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=785, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:17:14,776 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 32 states. [2018-10-24 12:17:16,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:16,272 INFO L93 Difference]: Finished difference Result 448 states and 528 transitions. [2018-10-24 12:17:16,272 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:17:16,272 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 89 [2018-10-24 12:17:16,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:16,274 INFO L225 Difference]: With dead ends: 448 [2018-10-24 12:17:16,274 INFO L226 Difference]: Without dead ends: 407 [2018-10-24 12:17:16,275 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 150 SyntacticMatches, 18 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1354 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=741, Invalid=3041, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:17:16,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 407 states. [2018-10-24 12:17:16,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 407 to 115. [2018-10-24 12:17:16,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-24 12:17:16,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-10-24 12:17:16,359 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-10-24 12:17:16,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:16,359 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-10-24 12:17:16,359 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:17:16,359 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-10-24 12:17:16,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:17:16,360 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:16,360 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:16,360 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:16,360 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:16,360 INFO L82 PathProgramCache]: Analyzing trace with hash 2074171351, now seen corresponding path program 7 times [2018-10-24 12:17:16,361 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:16,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:16,361 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:16,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:16,361 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:16,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:17,259 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:17,259 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:17,259 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:17,259 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:17,259 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:17,259 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:17,260 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:17,267 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:17,267 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:17:17,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:17,295 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:17,498 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:17,498 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:17,638 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:17,658 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:17,658 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 31 [2018-10-24 12:17:17,658 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:17,659 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:17:17,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:17:17,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=723, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:17:17,659 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 31 states. [2018-10-24 12:17:18,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:18,889 INFO L93 Difference]: Finished difference Result 487 states and 577 transitions. [2018-10-24 12:17:18,889 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:17:18,889 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 89 [2018-10-24 12:17:18,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:18,891 INFO L225 Difference]: With dead ends: 487 [2018-10-24 12:17:18,891 INFO L226 Difference]: Without dead ends: 446 [2018-10-24 12:17:18,891 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 151 SyntacticMatches, 18 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1056 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=633, Invalid=2447, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:17:18,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2018-10-24 12:17:18,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 118. [2018-10-24 12:17:18,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-10-24 12:17:18,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 128 transitions. [2018-10-24 12:17:18,980 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 128 transitions. Word has length 89 [2018-10-24 12:17:18,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:18,980 INFO L481 AbstractCegarLoop]: Abstraction has 118 states and 128 transitions. [2018-10-24 12:17:18,980 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:17:18,980 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 128 transitions. [2018-10-24 12:17:18,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-10-24 12:17:18,981 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:18,981 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:18,982 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:18,982 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:18,982 INFO L82 PathProgramCache]: Analyzing trace with hash -1421446787, now seen corresponding path program 14 times [2018-10-24 12:17:18,982 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:18,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:18,983 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:18,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:18,983 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:18,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:19,115 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 85 proven. 124 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-24 12:17:19,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:19,116 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:19,116 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:19,116 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:19,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:19,116 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:19,124 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:17:19,125 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:17:19,157 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:17:19,157 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:19,159 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:19,199 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:19,199 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:19,287 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:17:19,308 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:19,308 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 16 [2018-10-24 12:17:19,308 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:19,309 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:17:19,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:17:19,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:17:19,309 INFO L87 Difference]: Start difference. First operand 118 states and 128 transitions. Second operand 16 states. [2018-10-24 12:17:19,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:19,591 INFO L93 Difference]: Finished difference Result 128 states and 138 transitions. [2018-10-24 12:17:19,592 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:17:19,592 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 91 [2018-10-24 12:17:19,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:19,593 INFO L225 Difference]: With dead ends: 128 [2018-10-24 12:17:19,593 INFO L226 Difference]: Without dead ends: 126 [2018-10-24 12:17:19,594 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 173 SyntacticMatches, 17 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:17:19,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-10-24 12:17:19,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2018-10-24 12:17:19,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-10-24 12:17:19,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 136 transitions. [2018-10-24 12:17:19,673 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 136 transitions. Word has length 91 [2018-10-24 12:17:19,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:19,673 INFO L481 AbstractCegarLoop]: Abstraction has 126 states and 136 transitions. [2018-10-24 12:17:19,674 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:17:19,674 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 136 transitions. [2018-10-24 12:17:19,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:17:19,674 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:19,674 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:19,674 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:19,675 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:19,675 INFO L82 PathProgramCache]: Analyzing trace with hash -161069919, now seen corresponding path program 15 times [2018-10-24 12:17:19,675 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:19,675 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:19,675 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:19,675 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:19,675 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:19,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:20,009 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:20,009 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:20,009 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:20,009 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:20,009 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:20,009 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:20,009 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:20,018 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:17:20,018 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:17:20,048 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:17:20,048 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:20,050 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:21,568 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:21,569 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:21,744 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:21,764 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:21,764 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 42 [2018-10-24 12:17:21,764 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:21,765 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:17:21,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:17:21,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=1369, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:17:21,765 INFO L87 Difference]: Start difference. First operand 126 states and 136 transitions. Second operand 42 states. [2018-10-24 12:17:22,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:22,525 INFO L93 Difference]: Finished difference Result 225 states and 254 transitions. [2018-10-24 12:17:22,525 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:17:22,525 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 99 [2018-10-24 12:17:22,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:22,527 INFO L225 Difference]: With dead ends: 225 [2018-10-24 12:17:22,527 INFO L226 Difference]: Without dead ends: 180 [2018-10-24 12:17:22,528 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 160 SyntacticMatches, 20 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1688 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=763, Invalid=3019, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:17:22,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-10-24 12:17:22,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 128. [2018-10-24 12:17:22,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:17:22,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-10-24 12:17:22,656 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-10-24 12:17:22,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:22,656 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-10-24 12:17:22,656 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:17:22,657 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-10-24 12:17:22,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:17:22,657 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:22,657 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:22,658 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:22,658 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:22,658 INFO L82 PathProgramCache]: Analyzing trace with hash 1635135533, now seen corresponding path program 22 times [2018-10-24 12:17:22,658 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:22,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:22,659 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:22,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:22,659 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:22,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:23,223 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 152 proven. 58 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:23,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:23,223 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:23,223 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:23,224 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:23,224 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:23,224 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:23,232 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:23,232 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:17:23,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:23,262 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:23,623 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 152 proven. 58 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:23,623 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:23,802 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 152 proven. 58 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:23,822 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:23,822 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 41 [2018-10-24 12:17:23,822 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:23,823 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-24 12:17:23,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-24 12:17:23,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=1314, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:17:23,823 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 41 states. [2018-10-24 12:17:24,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:24,895 INFO L93 Difference]: Finished difference Result 277 states and 316 transitions. [2018-10-24 12:17:24,895 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:17:24,895 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 99 [2018-10-24 12:17:24,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:24,896 INFO L225 Difference]: With dead ends: 277 [2018-10-24 12:17:24,896 INFO L226 Difference]: Without dead ends: 232 [2018-10-24 12:17:24,897 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 161 SyntacticMatches, 20 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1944 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=903, Invalid=3789, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:17:24,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2018-10-24 12:17:25,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 128. [2018-10-24 12:17:25,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:17:25,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-10-24 12:17:25,048 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-10-24 12:17:25,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:25,048 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-10-24 12:17:25,048 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-24 12:17:25,048 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-10-24 12:17:25,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:17:25,049 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:25,049 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 7, 6, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:25,049 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:25,050 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:25,050 INFO L82 PathProgramCache]: Analyzing trace with hash 1382256313, now seen corresponding path program 23 times [2018-10-24 12:17:25,050 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:25,050 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:25,050 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:25,051 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:25,051 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:25,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:25,458 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 152 proven. 48 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:25,458 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:25,459 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:25,459 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:25,459 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:25,459 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:25,459 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:25,466 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:17:25,467 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:17:25,500 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:17:25,500 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:25,503 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:27,467 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 152 proven. 48 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:27,467 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:27,711 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 152 proven. 48 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:27,733 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:27,733 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 40 [2018-10-24 12:17:27,733 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:27,733 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-24 12:17:27,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-24 12:17:27,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=1257, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:17:27,734 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 40 states. [2018-10-24 12:17:29,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:29,010 INFO L93 Difference]: Finished difference Result 327 states and 376 transitions. [2018-10-24 12:17:29,011 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:17:29,011 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 99 [2018-10-24 12:17:29,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:29,012 INFO L225 Difference]: With dead ends: 327 [2018-10-24 12:17:29,012 INFO L226 Difference]: Without dead ends: 282 [2018-10-24 12:17:29,013 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 162 SyntacticMatches, 20 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2151 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1018, Invalid=4384, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:17:29,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2018-10-24 12:17:29,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 128. [2018-10-24 12:17:29,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:17:29,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-10-24 12:17:29,113 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-10-24 12:17:29,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:29,113 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-10-24 12:17:29,113 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-24 12:17:29,113 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-10-24 12:17:29,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:17:29,114 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:29,114 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 6, 5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:29,114 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:29,114 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:29,114 INFO L82 PathProgramCache]: Analyzing trace with hash 2012160069, now seen corresponding path program 24 times [2018-10-24 12:17:29,114 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:29,115 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:29,115 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:29,115 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:29,115 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:29,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:29,429 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 152 proven. 42 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:29,430 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:29,430 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:29,430 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:29,430 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:29,430 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:29,430 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:29,438 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:17:29,439 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:17:29,467 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:17:29,467 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:29,469 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:29,855 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 152 proven. 42 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:29,855 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:30,025 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 152 proven. 42 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:30,045 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:30,046 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 39 [2018-10-24 12:17:30,046 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:30,046 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:17:30,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:17:30,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=1198, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:17:30,047 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 39 states. [2018-10-24 12:17:31,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:31,713 INFO L93 Difference]: Finished difference Result 375 states and 434 transitions. [2018-10-24 12:17:31,713 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-24 12:17:31,713 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 99 [2018-10-24 12:17:31,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:31,714 INFO L225 Difference]: With dead ends: 375 [2018-10-24 12:17:31,715 INFO L226 Difference]: Without dead ends: 330 [2018-10-24 12:17:31,716 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 163 SyntacticMatches, 20 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2277 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1093, Invalid=4759, Unknown=0, NotChecked=0, Total=5852 [2018-10-24 12:17:31,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2018-10-24 12:17:31,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 128. [2018-10-24 12:17:31,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:17:31,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-10-24 12:17:31,839 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-10-24 12:17:31,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:31,839 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-10-24 12:17:31,840 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:17:31,840 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-10-24 12:17:31,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:17:31,840 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:31,840 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:31,840 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:31,840 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:31,841 INFO L82 PathProgramCache]: Analyzing trace with hash -1173773103, now seen corresponding path program 25 times [2018-10-24 12:17:31,841 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:31,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:31,841 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:31,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:31,842 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:31,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:32,258 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 152 proven. 40 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:32,258 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:32,258 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:32,259 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:32,259 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:32,259 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:32,259 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:32,267 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:32,267 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:17:32,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:32,296 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:32,812 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 152 proven. 40 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:32,812 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:32,970 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 152 proven. 40 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:32,990 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:32,991 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 38 [2018-10-24 12:17:32,991 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:32,991 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:17:32,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:17:32,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=1137, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:17:32,992 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 38 states. [2018-10-24 12:17:34,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:34,557 INFO L93 Difference]: Finished difference Result 421 states and 490 transitions. [2018-10-24 12:17:34,557 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:17:34,557 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 99 [2018-10-24 12:17:34,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:34,559 INFO L225 Difference]: With dead ends: 421 [2018-10-24 12:17:34,559 INFO L226 Difference]: Without dead ends: 376 [2018-10-24 12:17:34,560 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 164 SyntacticMatches, 20 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2302 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1119, Invalid=4887, Unknown=0, NotChecked=0, Total=6006 [2018-10-24 12:17:34,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2018-10-24 12:17:34,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 128. [2018-10-24 12:17:34,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:17:34,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-10-24 12:17:34,681 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-10-24 12:17:34,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:34,681 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-10-24 12:17:34,681 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:17:34,682 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-10-24 12:17:34,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:17:34,682 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:34,682 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 6, 5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:34,683 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:34,683 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:34,683 INFO L82 PathProgramCache]: Analyzing trace with hash -975971235, now seen corresponding path program 26 times [2018-10-24 12:17:34,683 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:34,683 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:34,683 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:34,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:34,684 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:34,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:35,115 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 152 proven. 42 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:35,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:35,115 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:35,115 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:35,115 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:35,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:35,116 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:35,127 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:17:35,127 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:17:35,161 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:17:35,161 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:35,163 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:35,485 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 152 proven. 42 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:35,486 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:35,651 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 152 proven. 42 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:35,671 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:35,671 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 37 [2018-10-24 12:17:35,671 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:35,671 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-24 12:17:35,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-24 12:17:35,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=1074, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:17:35,672 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 37 states. [2018-10-24 12:17:37,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:37,403 INFO L93 Difference]: Finished difference Result 465 states and 544 transitions. [2018-10-24 12:17:37,405 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-24 12:17:37,405 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 99 [2018-10-24 12:17:37,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:37,407 INFO L225 Difference]: With dead ends: 465 [2018-10-24 12:17:37,407 INFO L226 Difference]: Without dead ends: 420 [2018-10-24 12:17:37,408 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 165 SyntacticMatches, 20 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2217 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1093, Invalid=4759, Unknown=0, NotChecked=0, Total=5852 [2018-10-24 12:17:37,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 420 states. [2018-10-24 12:17:37,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 420 to 128. [2018-10-24 12:17:37,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:17:37,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-10-24 12:17:37,531 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-10-24 12:17:37,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:37,531 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-10-24 12:17:37,531 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-24 12:17:37,531 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-10-24 12:17:37,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:17:37,532 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:37,532 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 7, 6, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:37,532 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:37,532 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:37,532 INFO L82 PathProgramCache]: Analyzing trace with hash -1717664023, now seen corresponding path program 27 times [2018-10-24 12:17:37,533 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:37,533 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:37,533 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:37,533 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:37,533 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:37,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:37,807 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 152 proven. 48 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:37,808 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:37,808 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:37,808 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:37,808 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:37,808 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:37,808 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:37,817 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:17:37,817 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:17:37,846 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:17:37,846 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:37,850 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:38,139 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 152 proven. 48 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:38,140 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:38,300 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 152 proven. 48 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:38,322 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:38,323 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 36 [2018-10-24 12:17:38,323 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:38,323 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:17:38,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:17:38,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=1009, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:17:38,324 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 36 states. [2018-10-24 12:17:40,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:40,035 INFO L93 Difference]: Finished difference Result 507 states and 596 transitions. [2018-10-24 12:17:40,035 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:17:40,035 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 99 [2018-10-24 12:17:40,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:40,037 INFO L225 Difference]: With dead ends: 507 [2018-10-24 12:17:40,037 INFO L226 Difference]: Without dead ends: 462 [2018-10-24 12:17:40,038 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 166 SyntacticMatches, 20 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2019 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1018, Invalid=4384, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:17:40,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 462 states. [2018-10-24 12:17:40,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 462 to 128. [2018-10-24 12:17:40,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:17:40,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-10-24 12:17:40,168 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-10-24 12:17:40,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:40,168 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-10-24 12:17:40,168 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:17:40,168 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-10-24 12:17:40,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:17:40,169 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:40,169 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:40,169 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:40,169 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:40,169 INFO L82 PathProgramCache]: Analyzing trace with hash 283796597, now seen corresponding path program 28 times [2018-10-24 12:17:40,169 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:40,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:40,170 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:40,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:40,170 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:40,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:40,488 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 152 proven. 58 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:40,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:40,488 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:40,488 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:40,488 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:40,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:40,488 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:40,499 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:40,499 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:17:40,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:40,528 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:40,798 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 152 proven. 58 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:40,799 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:41,159 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 152 proven. 58 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:41,180 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:41,180 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2018-10-24 12:17:41,180 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:41,181 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 12:17:41,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 12:17:41,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=942, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:17:41,181 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 35 states. [2018-10-24 12:17:42,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:42,968 INFO L93 Difference]: Finished difference Result 547 states and 646 transitions. [2018-10-24 12:17:42,968 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-24 12:17:42,968 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 99 [2018-10-24 12:17:42,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:42,971 INFO L225 Difference]: With dead ends: 547 [2018-10-24 12:17:42,971 INFO L226 Difference]: Without dead ends: 502 [2018-10-24 12:17:42,972 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 167 SyntacticMatches, 20 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1716 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=903, Invalid=3789, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:17:42,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2018-10-24 12:17:43,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 128. [2018-10-24 12:17:43,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:17:43,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-10-24 12:17:43,096 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-10-24 12:17:43,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:43,096 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-10-24 12:17:43,096 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 12:17:43,096 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-10-24 12:17:43,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:17:43,097 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:43,097 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:43,097 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:43,097 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:43,097 INFO L82 PathProgramCache]: Analyzing trace with hash 1885877505, now seen corresponding path program 8 times [2018-10-24 12:17:43,097 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:43,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:43,098 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:43,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:43,098 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:43,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:43,361 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:43,362 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:43,362 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:43,362 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:43,362 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:43,362 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:43,362 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:43,369 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:17:43,369 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:17:43,403 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:17:43,403 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:43,406 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:43,675 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:43,676 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:43,871 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:43,891 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:43,892 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 34 [2018-10-24 12:17:43,892 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:43,892 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:17:43,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:17:43,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=873, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:17:43,893 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 34 states. [2018-10-24 12:17:45,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:45,665 INFO L93 Difference]: Finished difference Result 590 states and 700 transitions. [2018-10-24 12:17:45,666 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:17:45,666 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 99 [2018-10-24 12:17:45,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:45,668 INFO L225 Difference]: With dead ends: 590 [2018-10-24 12:17:45,668 INFO L226 Difference]: Without dead ends: 545 [2018-10-24 12:17:45,669 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 168 SyntacticMatches, 20 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1328 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=763, Invalid=3019, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:17:45,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 545 states. [2018-10-24 12:17:45,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 545 to 131. [2018-10-24 12:17:45,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-10-24 12:17:45,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 142 transitions. [2018-10-24 12:17:45,795 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 142 transitions. Word has length 99 [2018-10-24 12:17:45,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:45,795 INFO L481 AbstractCegarLoop]: Abstraction has 131 states and 142 transitions. [2018-10-24 12:17:45,795 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:17:45,795 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 142 transitions. [2018-10-24 12:17:45,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-24 12:17:45,796 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:45,796 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:45,796 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:45,797 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:45,797 INFO L82 PathProgramCache]: Analyzing trace with hash -1743772005, now seen corresponding path program 16 times [2018-10-24 12:17:45,797 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:45,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:45,798 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:45,798 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:45,798 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:45,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:46,005 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 105 proven. 158 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-24 12:17:46,005 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:46,005 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:46,005 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:46,005 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:46,005 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:46,005 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 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:46,012 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:46,013 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:17:46,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:46,046 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:46,109 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:46,109 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:46,407 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:17:46,428 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:46,428 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 17 [2018-10-24 12:17:46,428 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:46,428 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:17:46,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:17:46,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=194, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:17:46,429 INFO L87 Difference]: Start difference. First operand 131 states and 142 transitions. Second operand 17 states. [2018-10-24 12:17:46,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:46,748 INFO L93 Difference]: Finished difference Result 141 states and 152 transitions. [2018-10-24 12:17:46,748 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:17:46,748 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 101 [2018-10-24 12:17:46,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:46,749 INFO L225 Difference]: With dead ends: 141 [2018-10-24 12:17:46,749 INFO L226 Difference]: Without dead ends: 139 [2018-10-24 12:17:46,750 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 192 SyntacticMatches, 19 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:17:46,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-24 12:17:46,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2018-10-24 12:17:46,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-10-24 12:17:46,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 150 transitions. [2018-10-24 12:17:46,869 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 150 transitions. Word has length 101 [2018-10-24 12:17:46,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:46,870 INFO L481 AbstractCegarLoop]: Abstraction has 139 states and 150 transitions. [2018-10-24 12:17:46,870 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:17:46,870 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 150 transitions. [2018-10-24 12:17:46,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:17:46,870 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:46,870 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:46,870 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:46,871 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:46,871 INFO L82 PathProgramCache]: Analyzing trace with hash -860881985, now seen corresponding path program 17 times [2018-10-24 12:17:46,871 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:46,871 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:46,871 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:46,871 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:46,872 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:46,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:48,487 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:17:48,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:48,488 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:48,488 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:48,488 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:48,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:48,488 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:48,495 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:17:48,495 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:17:48,534 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 12:17:48,534 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:48,536 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:48,990 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:17:48,990 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:49,198 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:17:49,219 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:49,219 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 46 [2018-10-24 12:17:49,219 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:49,219 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-24 12:17:49,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-24 12:17:49,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=421, Invalid=1649, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:17:49,220 INFO L87 Difference]: Start difference. First operand 139 states and 150 transitions. Second operand 46 states. [2018-10-24 12:17:50,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:50,101 INFO L93 Difference]: Finished difference Result 248 states and 280 transitions. [2018-10-24 12:17:50,101 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:17:50,101 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 109 [2018-10-24 12:17:50,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:50,102 INFO L225 Difference]: With dead ends: 248 [2018-10-24 12:17:50,102 INFO L226 Difference]: Without dead ends: 199 [2018-10-24 12:17:50,103 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 176 SyntacticMatches, 22 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2081 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=905, Invalid=3651, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:17:50,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-10-24 12:17:50,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 141. [2018-10-24 12:17:50,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:17:50,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-10-24 12:17:50,246 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-10-24 12:17:50,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:50,247 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-10-24 12:17:50,247 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-24 12:17:50,247 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-10-24 12:17:50,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:17:50,247 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:50,247 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 9, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:50,247 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:50,248 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:50,248 INFO L82 PathProgramCache]: Analyzing trace with hash 1311238219, now seen corresponding path program 29 times [2018-10-24 12:17:50,248 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:50,248 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:50,248 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:50,248 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:50,248 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:50,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:51,045 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 189 proven. 74 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:17:51,045 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:51,045 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:51,045 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:51,045 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:51,046 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:51,046 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:51,056 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:17:51,056 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:17:51,096 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 12:17:51,097 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:51,100 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:51,798 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 189 proven. 74 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:17:51,799 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:52,003 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 189 proven. 74 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:17:52,024 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:52,024 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 45 [2018-10-24 12:17:52,024 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:52,024 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:17:52,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:17:52,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=391, Invalid=1589, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:17:52,025 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 45 states. [2018-10-24 12:17:53,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:53,439 INFO L93 Difference]: Finished difference Result 306 states and 349 transitions. [2018-10-24 12:17:53,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:17:53,439 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 109 [2018-10-24 12:17:53,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:53,441 INFO L225 Difference]: With dead ends: 306 [2018-10-24 12:17:53,441 INFO L226 Difference]: Without dead ends: 257 [2018-10-24 12:17:53,441 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 177 SyntacticMatches, 22 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2415 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1081, Invalid=4619, Unknown=0, NotChecked=0, Total=5700 [2018-10-24 12:17:53,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2018-10-24 12:17:53,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 141. [2018-10-24 12:17:53,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:17:53,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-10-24 12:17:53,595 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-10-24 12:17:53,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:53,595 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-10-24 12:17:53,595 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:17:53,596 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-10-24 12:17:53,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:17:53,596 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:53,596 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 8, 7, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:53,596 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:53,596 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:53,597 INFO L82 PathProgramCache]: Analyzing trace with hash 562661335, now seen corresponding path program 30 times [2018-10-24 12:17:53,597 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:53,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:53,597 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:53,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:53,597 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:53,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:54,957 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 189 proven. 62 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:17:54,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:54,958 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:54,958 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:54,958 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:54,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:54,958 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:54,966 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:17:54,967 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:17:54,999 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:17:54,999 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:55,002 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:55,398 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 189 proven. 62 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:17:55,398 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:55,596 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 189 proven. 62 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:17:55,617 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:55,617 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 44 [2018-10-24 12:17:55,617 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:55,617 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-24 12:17:55,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-24 12:17:55,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=365, Invalid=1527, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:17:55,618 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 44 states. [2018-10-24 12:17:57,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:57,420 INFO L93 Difference]: Finished difference Result 362 states and 416 transitions. [2018-10-24 12:17:57,420 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:17:57,421 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 109 [2018-10-24 12:17:57,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:57,422 INFO L225 Difference]: With dead ends: 362 [2018-10-24 12:17:57,422 INFO L226 Difference]: Without dead ends: 313 [2018-10-24 12:17:57,423 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 178 SyntacticMatches, 22 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2703 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1234, Invalid=5408, Unknown=0, NotChecked=0, Total=6642 [2018-10-24 12:17:57,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 313 states. [2018-10-24 12:17:57,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 313 to 141. [2018-10-24 12:17:57,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:17:57,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-10-24 12:17:57,612 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-10-24 12:17:57,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:57,612 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-10-24 12:17:57,612 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-24 12:17:57,613 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-10-24 12:17:57,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:17:57,613 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:57,613 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 7, 6, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:57,614 INFO L424 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:57,614 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:57,614 INFO L82 PathProgramCache]: Analyzing trace with hash 195402339, now seen corresponding path program 31 times [2018-10-24 12:17:57,614 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:57,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:57,615 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:57,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:57,615 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:57,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:58,124 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 189 proven. 54 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:17:58,124 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:58,124 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:58,124 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:58,124 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:58,125 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:58,125 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:58,132 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:58,132 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:17:58,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:58,165 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:58,585 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 189 proven. 54 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:17:58,586 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:58,783 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 189 proven. 54 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:17:58,805 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:58,805 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 43 [2018-10-24 12:17:58,805 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:58,805 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-24 12:17:58,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-24 12:17:58,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=343, Invalid=1463, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:17:58,806 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 43 states. [2018-10-24 12:18:00,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:00,753 INFO L93 Difference]: Finished difference Result 416 states and 481 transitions. [2018-10-24 12:18:00,754 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-24 12:18:00,754 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 109 [2018-10-24 12:18:00,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:00,755 INFO L225 Difference]: With dead ends: 416 [2018-10-24 12:18:00,755 INFO L226 Difference]: Without dead ends: 367 [2018-10-24 12:18:00,756 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 179 SyntacticMatches, 22 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2907 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1346, Invalid=5964, Unknown=0, NotChecked=0, Total=7310 [2018-10-24 12:18:00,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2018-10-24 12:18:00,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 141. [2018-10-24 12:18:00,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:18:00,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-10-24 12:18:00,947 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-10-24 12:18:00,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:00,947 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-10-24 12:18:00,948 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-24 12:18:00,948 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-10-24 12:18:00,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:18:00,948 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:00,949 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 6, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:00,949 INFO L424 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:00,949 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:00,949 INFO L82 PathProgramCache]: Analyzing trace with hash 1316806639, now seen corresponding path program 32 times [2018-10-24 12:18:00,949 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:00,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:00,951 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:00,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:00,951 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:00,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:02,251 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 189 proven. 50 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:18:02,252 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:02,252 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:02,252 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:02,252 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:02,252 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:02,252 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:02,260 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:02,260 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:02,299 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 12:18:02,299 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:02,302 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:02,751 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 189 proven. 50 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:18:02,751 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:02,942 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 189 proven. 50 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:18:02,963 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:02,963 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 42 [2018-10-24 12:18:02,963 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:02,963 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:18:02,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:18:02,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=1397, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:18:02,964 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 42 states. [2018-10-24 12:18:04,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:04,954 INFO L93 Difference]: Finished difference Result 468 states and 544 transitions. [2018-10-24 12:18:04,954 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-24 12:18:04,954 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 109 [2018-10-24 12:18:04,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:04,956 INFO L225 Difference]: With dead ends: 468 [2018-10-24 12:18:04,956 INFO L226 Difference]: Without dead ends: 419 [2018-10-24 12:18:04,957 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 180 SyntacticMatches, 22 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3001 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1405, Invalid=6251, Unknown=0, NotChecked=0, Total=7656 [2018-10-24 12:18:04,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2018-10-24 12:18:05,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 141. [2018-10-24 12:18:05,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:18:05,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-10-24 12:18:05,109 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-10-24 12:18:05,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:05,109 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-10-24 12:18:05,109 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:18:05,109 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-10-24 12:18:05,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:18:05,110 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:05,110 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 6, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:05,110 INFO L424 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:05,110 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:05,111 INFO L82 PathProgramCache]: Analyzing trace with hash 893393019, now seen corresponding path program 33 times [2018-10-24 12:18:05,111 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:05,111 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:05,111 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:05,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:05,112 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:05,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:07,278 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 189 proven. 50 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:18:07,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:07,279 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:07,279 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:07,279 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:07,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:07,279 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 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:07,289 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:07,289 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:07,341 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:07,341 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:07,344 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:07,990 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 189 proven. 50 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:18:07,990 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:08,187 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 189 proven. 50 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:18:08,207 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:08,207 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 41 [2018-10-24 12:18:08,207 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:08,207 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-24 12:18:08,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-24 12:18:08,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=1329, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:18:08,208 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 41 states. [2018-10-24 12:18:10,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:10,824 INFO L93 Difference]: Finished difference Result 518 states and 605 transitions. [2018-10-24 12:18:10,824 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-24 12:18:10,824 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 109 [2018-10-24 12:18:10,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:10,826 INFO L225 Difference]: With dead ends: 518 [2018-10-24 12:18:10,826 INFO L226 Difference]: Without dead ends: 469 [2018-10-24 12:18:10,827 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 181 SyntacticMatches, 22 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2971 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=1405, Invalid=6251, Unknown=0, NotChecked=0, Total=7656 [2018-10-24 12:18:10,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2018-10-24 12:18:10,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 141. [2018-10-24 12:18:10,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:18:10,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-10-24 12:18:10,986 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-10-24 12:18:10,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:10,987 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-10-24 12:18:10,987 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-24 12:18:10,987 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-10-24 12:18:10,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:18:10,988 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:10,988 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 7, 6, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:10,988 INFO L424 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:10,988 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:10,988 INFO L82 PathProgramCache]: Analyzing trace with hash -1605368825, now seen corresponding path program 34 times [2018-10-24 12:18:10,988 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:10,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:10,989 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:10,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:10,989 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:10,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:11,289 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 189 proven. 54 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:18:11,289 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:11,289 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:11,289 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:11,290 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:11,290 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:11,290 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:11,297 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:11,298 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:11,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:11,332 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:12,071 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 189 proven. 54 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:18:12,071 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:12,273 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 189 proven. 54 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:18:12,293 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:12,293 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 40 [2018-10-24 12:18:12,293 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:12,294 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-24 12:18:12,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-24 12:18:12,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=1259, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:18:12,294 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 40 states. [2018-10-24 12:18:14,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:14,643 INFO L93 Difference]: Finished difference Result 566 states and 664 transitions. [2018-10-24 12:18:14,644 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-24 12:18:14,644 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 109 [2018-10-24 12:18:14,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:14,646 INFO L225 Difference]: With dead ends: 566 [2018-10-24 12:18:14,646 INFO L226 Difference]: Without dead ends: 517 [2018-10-24 12:18:14,647 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 182 SyntacticMatches, 22 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2811 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1346, Invalid=5964, Unknown=0, NotChecked=0, Total=7310 [2018-10-24 12:18:14,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 517 states. [2018-10-24 12:18:14,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 517 to 141. [2018-10-24 12:18:14,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:18:14,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-10-24 12:18:14,821 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-10-24 12:18:14,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:14,821 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-10-24 12:18:14,822 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-24 12:18:14,822 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-10-24 12:18:14,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:18:14,822 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:14,822 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 8, 7, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:14,823 INFO L424 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:14,823 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:14,823 INFO L82 PathProgramCache]: Analyzing trace with hash -1858248045, now seen corresponding path program 35 times [2018-10-24 12:18:14,823 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:14,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:14,823 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:14,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:14,824 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:14,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:15,957 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 189 proven. 62 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:18:15,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:15,957 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:15,957 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:15,957 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:15,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:15,957 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:15,967 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:15,967 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:16,005 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 12:18:16,005 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:16,008 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:16,354 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 189 proven. 62 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:18:16,354 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:16,547 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 189 proven. 62 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:18:16,568 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:16,568 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 39 [2018-10-24 12:18:16,568 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:16,569 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:18:16,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:18:16,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=295, Invalid=1187, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:18:16,569 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 39 states. [2018-10-24 12:18:19,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:19,000 INFO L93 Difference]: Finished difference Result 612 states and 721 transitions. [2018-10-24 12:18:19,001 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-24 12:18:19,001 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 109 [2018-10-24 12:18:19,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:19,003 INFO L225 Difference]: With dead ends: 612 [2018-10-24 12:18:19,004 INFO L226 Difference]: Without dead ends: 563 [2018-10-24 12:18:19,004 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 183 SyntacticMatches, 22 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2523 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1234, Invalid=5408, Unknown=0, NotChecked=0, Total=6642 [2018-10-24 12:18:19,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 563 states. [2018-10-24 12:18:19,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 563 to 141. [2018-10-24 12:18:19,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:18:19,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-10-24 12:18:19,177 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-10-24 12:18:19,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:19,177 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-10-24 12:18:19,177 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:18:19,177 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-10-24 12:18:19,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:18:19,178 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:19,178 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 9, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:19,178 INFO L424 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:19,178 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:19,179 INFO L82 PathProgramCache]: Analyzing trace with hash -1228344289, now seen corresponding path program 36 times [2018-10-24 12:18:19,179 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:19,179 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:19,179 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:19,179 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:19,180 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:19,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:19,429 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 189 proven. 74 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:18:19,429 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:19,429 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:19,430 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:19,430 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:19,430 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:19,430 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:19,442 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:19,442 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:19,495 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:19,495 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:19,498 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:19,832 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 189 proven. 74 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:18:19,832 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:20,018 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 189 proven. 74 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:18:20,038 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:20,039 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2018-10-24 12:18:20,039 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:20,039 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:18:20,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:18:20,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=1113, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:18:20,040 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 38 states. [2018-10-24 12:18:22,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:22,531 INFO L93 Difference]: Finished difference Result 656 states and 776 transitions. [2018-10-24 12:18:22,531 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-24 12:18:22,531 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 109 [2018-10-24 12:18:22,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:22,534 INFO L225 Difference]: With dead ends: 656 [2018-10-24 12:18:22,534 INFO L226 Difference]: Without dead ends: 607 [2018-10-24 12:18:22,535 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 184 SyntacticMatches, 22 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2121 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1081, Invalid=4619, Unknown=0, NotChecked=0, Total=5700 [2018-10-24 12:18:22,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2018-10-24 12:18:22,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 141. [2018-10-24 12:18:22,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:18:22,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-10-24 12:18:22,700 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-10-24 12:18:22,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:22,700 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-10-24 12:18:22,700 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:18:22,700 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-10-24 12:18:22,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:18:22,701 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:22,701 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:22,701 INFO L424 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:22,702 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:22,702 INFO L82 PathProgramCache]: Analyzing trace with hash -119310165, now seen corresponding path program 9 times [2018-10-24 12:18:22,702 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:22,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:22,703 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:22,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:22,703 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:22,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:22,950 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:18:22,950 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:22,950 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:22,950 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:22,950 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:22,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:22,951 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:22,960 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:22,960 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:22,987 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:22,988 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:22,989 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:23,328 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:18:23,328 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:23,532 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:18:23,552 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:23,552 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 37 [2018-10-24 12:18:23,552 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:23,552 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-24 12:18:23,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-24 12:18:23,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=295, Invalid=1037, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:18:23,553 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 37 states. [2018-10-24 12:18:25,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:25,837 INFO L93 Difference]: Finished difference Result 703 states and 835 transitions. [2018-10-24 12:18:25,837 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:18:25,837 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 109 [2018-10-24 12:18:25,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:25,840 INFO L225 Difference]: With dead ends: 703 [2018-10-24 12:18:25,841 INFO L226 Difference]: Without dead ends: 654 [2018-10-24 12:18:25,842 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 185 SyntacticMatches, 22 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1631 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=905, Invalid=3651, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:18:25,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 654 states. [2018-10-24 12:18:26,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 654 to 144. [2018-10-24 12:18:26,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-10-24 12:18:26,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 156 transitions. [2018-10-24 12:18:26,038 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 156 transitions. Word has length 109 [2018-10-24 12:18:26,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:26,038 INFO L481 AbstractCegarLoop]: Abstraction has 144 states and 156 transitions. [2018-10-24 12:18:26,038 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-24 12:18:26,038 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 156 transitions. [2018-10-24 12:18:26,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-10-24 12:18:26,039 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:26,039 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:26,039 INFO L424 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:26,039 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:26,039 INFO L82 PathProgramCache]: Analyzing trace with hash -1752486599, now seen corresponding path program 18 times [2018-10-24 12:18:26,039 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:26,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:26,040 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:26,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:26,040 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:26,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:26,201 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 127 proven. 196 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-24 12:18:26,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:26,201 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:26,201 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:26,201 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:26,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:26,201 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:26,211 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:26,211 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:26,244 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:26,244 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:26,246 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:26,293 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:18:26,293 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:26,416 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:18:26,436 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:26,436 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 18 [2018-10-24 12:18:26,436 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:26,436 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:18:26,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:18:26,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:18:26,437 INFO L87 Difference]: Start difference. First operand 144 states and 156 transitions. Second operand 18 states. [2018-10-24 12:18:26,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:26,906 INFO L93 Difference]: Finished difference Result 154 states and 166 transitions. [2018-10-24 12:18:26,907 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:18:26,907 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 111 [2018-10-24 12:18:26,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:26,908 INFO L225 Difference]: With dead ends: 154 [2018-10-24 12:18:26,908 INFO L226 Difference]: Without dead ends: 152 [2018-10-24 12:18:26,908 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 211 SyntacticMatches, 21 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:18:26,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2018-10-24 12:18:27,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 152. [2018-10-24 12:18:27,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2018-10-24 12:18:27,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 164 transitions. [2018-10-24 12:18:27,095 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 164 transitions. Word has length 111 [2018-10-24 12:18:27,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:27,095 INFO L481 AbstractCegarLoop]: Abstraction has 152 states and 164 transitions. [2018-10-24 12:18:27,095 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:18:27,095 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 164 transitions. [2018-10-24 12:18:27,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:18:27,096 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:27,096 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:27,096 INFO L424 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:27,096 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:27,096 INFO L82 PathProgramCache]: Analyzing trace with hash 1040286813, now seen corresponding path program 19 times [2018-10-24 12:18:27,096 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:27,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:27,097 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:27,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:27,097 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:27,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:27,578 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:27,579 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:27,579 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:27,579 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:27,579 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:27,579 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:27,579 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:27,586 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:27,587 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:27,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:27,623 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:28,107 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:28,107 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:28,388 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:28,408 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:28,408 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 50 [2018-10-24 12:18:28,408 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:28,408 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-24 12:18:28,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-24 12:18:28,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=495, Invalid=1955, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:18:28,409 INFO L87 Difference]: Start difference. First operand 152 states and 164 transitions. Second operand 50 states. [2018-10-24 12:18:29,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:29,654 INFO L93 Difference]: Finished difference Result 271 states and 306 transitions. [2018-10-24 12:18:29,654 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:18:29,654 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 119 [2018-10-24 12:18:29,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:29,655 INFO L225 Difference]: With dead ends: 271 [2018-10-24 12:18:29,655 INFO L226 Difference]: Without dead ends: 218 [2018-10-24 12:18:29,656 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 192 SyntacticMatches, 24 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2515 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1059, Invalid=4343, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:18:29,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2018-10-24 12:18:29,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 154. [2018-10-24 12:18:29,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:18:29,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-10-24 12:18:29,852 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-10-24 12:18:29,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:29,853 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-10-24 12:18:29,853 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-24 12:18:29,853 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-10-24 12:18:29,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:18:29,854 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:29,854 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 10, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:29,854 INFO L424 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:29,854 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:29,854 INFO L82 PathProgramCache]: Analyzing trace with hash -661376535, now seen corresponding path program 37 times [2018-10-24 12:18:29,854 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:29,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:29,855 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:29,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:29,855 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:29,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:30,161 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 230 proven. 92 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:30,161 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:30,161 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:30,161 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:30,161 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:30,162 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:30,162 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:30,171 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:30,171 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:30,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:30,207 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:30,702 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 230 proven. 92 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:30,702 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:31,030 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 230 proven. 92 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:31,050 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:31,051 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 49 [2018-10-24 12:18:31,051 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:31,051 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-24 12:18:31,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-24 12:18:31,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=462, Invalid=1890, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:18:31,052 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 49 states. [2018-10-24 12:18:32,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:32,950 INFO L93 Difference]: Finished difference Result 335 states and 382 transitions. [2018-10-24 12:18:32,950 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-24 12:18:32,951 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 119 [2018-10-24 12:18:32,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:32,952 INFO L225 Difference]: With dead ends: 335 [2018-10-24 12:18:32,952 INFO L226 Difference]: Without dead ends: 282 [2018-10-24 12:18:32,953 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 193 SyntacticMatches, 24 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2937 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1275, Invalid=5531, Unknown=0, NotChecked=0, Total=6806 [2018-10-24 12:18:32,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2018-10-24 12:18:33,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 154. [2018-10-24 12:18:33,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:18:33,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-10-24 12:18:33,214 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-10-24 12:18:33,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:33,215 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-10-24 12:18:33,215 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-24 12:18:33,215 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-10-24 12:18:33,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:18:33,215 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:33,215 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 9, 8, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:33,215 INFO L424 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:33,216 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:33,216 INFO L82 PathProgramCache]: Analyzing trace with hash 516739701, now seen corresponding path program 38 times [2018-10-24 12:18:33,216 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:33,216 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:33,216 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:33,216 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:33,216 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:33,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:33,504 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 230 proven. 78 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:33,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:33,504 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:33,504 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:33,504 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:33,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:33,505 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:33,512 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:33,512 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:33,549 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-24 12:18:33,549 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:33,552 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:34,210 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 230 proven. 78 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:34,210 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:34,454 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 230 proven. 78 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:34,474 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:34,475 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 48 [2018-10-24 12:18:34,475 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:34,475 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-24 12:18:34,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-24 12:18:34,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=433, Invalid=1823, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:18:34,476 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 48 states. [2018-10-24 12:18:36,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:36,585 INFO L93 Difference]: Finished difference Result 397 states and 456 transitions. [2018-10-24 12:18:36,585 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:18:36,585 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 119 [2018-10-24 12:18:36,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:36,586 INFO L225 Difference]: With dead ends: 397 [2018-10-24 12:18:36,587 INFO L226 Difference]: Without dead ends: 344 [2018-10-24 12:18:36,588 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 194 SyntacticMatches, 24 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3318 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1471, Invalid=6539, Unknown=0, NotChecked=0, Total=8010 [2018-10-24 12:18:36,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2018-10-24 12:18:36,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 154. [2018-10-24 12:18:36,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:18:36,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-10-24 12:18:36,814 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-10-24 12:18:36,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:36,814 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-10-24 12:18:36,814 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-24 12:18:36,814 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-10-24 12:18:36,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:18:36,815 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:36,815 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 8, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:36,815 INFO L424 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:36,815 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:36,815 INFO L82 PathProgramCache]: Analyzing trace with hash -1752422911, now seen corresponding path program 39 times [2018-10-24 12:18:36,815 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:36,816 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:36,816 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:36,816 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:36,816 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:36,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:37,104 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 230 proven. 68 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:37,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:37,104 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:37,104 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:37,104 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:37,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:37,104 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:37,112 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:37,113 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:37,147 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:37,147 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:37,150 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:37,965 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 230 proven. 68 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:37,965 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:38,214 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 230 proven. 68 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:38,234 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:38,234 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 47 [2018-10-24 12:18:38,235 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:38,235 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-24 12:18:38,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-24 12:18:38,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=1754, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:18:38,236 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 47 states. [2018-10-24 12:18:40,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:40,728 INFO L93 Difference]: Finished difference Result 457 states and 528 transitions. [2018-10-24 12:18:40,729 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-10-24 12:18:40,729 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 119 [2018-10-24 12:18:40,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:40,730 INFO L225 Difference]: With dead ends: 457 [2018-10-24 12:18:40,730 INFO L226 Difference]: Without dead ends: 404 [2018-10-24 12:18:40,731 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 195 SyntacticMatches, 24 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3614 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1626, Invalid=7304, Unknown=0, NotChecked=0, Total=8930 [2018-10-24 12:18:40,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2018-10-24 12:18:40,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 154. [2018-10-24 12:18:40,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:18:40,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-10-24 12:18:40,960 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-10-24 12:18:40,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:40,960 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-10-24 12:18:40,960 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-24 12:18:40,960 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-10-24 12:18:40,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:18:40,961 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:40,961 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 7, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:40,961 INFO L424 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:40,961 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:40,961 INFO L82 PathProgramCache]: Analyzing trace with hash -1964839795, now seen corresponding path program 40 times [2018-10-24 12:18:40,961 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:40,962 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:40,962 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:40,962 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:40,962 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:40,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:41,278 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 230 proven. 62 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:41,278 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:41,278 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:41,279 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:41,279 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:41,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:41,279 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 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:41,286 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:41,286 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:41,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:41,321 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:42,483 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 230 proven. 62 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:42,483 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:42,898 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 230 proven. 62 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:42,919 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:42,920 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 46 [2018-10-24 12:18:42,920 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:42,920 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-24 12:18:42,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-24 12:18:42,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=387, Invalid=1683, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:18:42,921 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 46 states. [2018-10-24 12:18:45,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:45,750 INFO L93 Difference]: Finished difference Result 515 states and 598 transitions. [2018-10-24 12:18:45,750 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-24 12:18:45,750 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 119 [2018-10-24 12:18:45,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:45,753 INFO L225 Difference]: With dead ends: 515 [2018-10-24 12:18:45,753 INFO L226 Difference]: Without dead ends: 462 [2018-10-24 12:18:45,754 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 196 SyntacticMatches, 24 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3793 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1725, Invalid=7781, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:18:45,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 462 states. [2018-10-24 12:18:45,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 462 to 154. [2018-10-24 12:18:45,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:18:45,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-10-24 12:18:45,972 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-10-24 12:18:45,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:45,973 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-10-24 12:18:45,973 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-24 12:18:45,973 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-10-24 12:18:45,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:18:45,973 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:45,974 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:45,974 INFO L424 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:45,974 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:45,974 INFO L82 PathProgramCache]: Analyzing trace with hash -1911429607, now seen corresponding path program 41 times [2018-10-24 12:18:45,974 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:45,975 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:45,975 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:45,975 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:45,975 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:45,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:46,271 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 230 proven. 60 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:46,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:46,271 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:46,271 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:46,271 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:46,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:46,272 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:46,279 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:46,280 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:46,320 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-24 12:18:46,320 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:46,324 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:47,002 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 230 proven. 60 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:47,003 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:47,218 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 230 proven. 60 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:47,238 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:47,239 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 45 [2018-10-24 12:18:47,239 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:47,239 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:18:47,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:18:47,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=1610, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:18:47,240 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 45 states. [2018-10-24 12:18:50,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:50,250 INFO L93 Difference]: Finished difference Result 571 states and 666 transitions. [2018-10-24 12:18:50,250 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-10-24 12:18:50,250 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 119 [2018-10-24 12:18:50,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:50,253 INFO L225 Difference]: With dead ends: 571 [2018-10-24 12:18:50,253 INFO L226 Difference]: Without dead ends: 518 [2018-10-24 12:18:50,254 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 197 SyntacticMatches, 24 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3835 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1759, Invalid=7943, Unknown=0, NotChecked=0, Total=9702 [2018-10-24 12:18:50,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2018-10-24 12:18:50,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 154. [2018-10-24 12:18:50,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:18:50,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-10-24 12:18:50,485 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-10-24 12:18:50,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:50,485 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-10-24 12:18:50,485 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:18:50,485 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-10-24 12:18:50,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:18:50,485 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:50,486 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 7, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:50,486 INFO L424 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:50,486 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:50,486 INFO L82 PathProgramCache]: Analyzing trace with hash 260690597, now seen corresponding path program 42 times [2018-10-24 12:18:50,486 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:50,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:50,487 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:50,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:50,487 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:50,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:50,892 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 230 proven. 62 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:50,892 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:50,892 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:50,892 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:50,893 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:50,893 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:50,893 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 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:50,901 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:50,901 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:50,935 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:50,935 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:50,937 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:51,366 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 230 proven. 62 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:51,366 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:51,593 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 230 proven. 62 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:51,613 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:51,613 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 44 [2018-10-24 12:18:51,614 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:51,614 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-24 12:18:51,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-24 12:18:51,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=1535, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:18:51,614 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 44 states. [2018-10-24 12:18:54,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:54,769 INFO L93 Difference]: Finished difference Result 625 states and 732 transitions. [2018-10-24 12:18:54,770 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-24 12:18:54,770 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 119 [2018-10-24 12:18:54,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:54,772 INFO L225 Difference]: With dead ends: 625 [2018-10-24 12:18:54,772 INFO L226 Difference]: Without dead ends: 572 [2018-10-24 12:18:54,773 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 198 SyntacticMatches, 24 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3731 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1725, Invalid=7781, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:18:54,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2018-10-24 12:18:55,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 154. [2018-10-24 12:18:55,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:18:55,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-10-24 12:18:55,027 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-10-24 12:18:55,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:55,027 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-10-24 12:18:55,028 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-24 12:18:55,028 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-10-24 12:18:55,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:18:55,028 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:55,028 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 8, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:55,029 INFO L424 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:55,029 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:55,029 INFO L82 PathProgramCache]: Analyzing trace with hash -487886287, now seen corresponding path program 43 times [2018-10-24 12:18:55,029 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:55,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:55,030 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:55,030 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:55,030 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:55,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:55,297 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 230 proven. 68 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:55,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:55,298 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:55,298 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:55,298 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:55,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:55,298 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:55,307 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:55,307 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:55,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:55,340 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:55,730 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 230 proven. 68 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:55,730 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:55,950 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 230 proven. 68 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:55,971 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:55,972 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 43 [2018-10-24 12:18:55,972 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:55,972 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-24 12:18:55,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-24 12:18:55,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=348, Invalid=1458, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:18:55,973 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 43 states. [2018-10-24 12:18:59,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:59,243 INFO L93 Difference]: Finished difference Result 677 states and 796 transitions. [2018-10-24 12:18:59,244 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-10-24 12:18:59,244 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 119 [2018-10-24 12:18:59,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:59,246 INFO L225 Difference]: With dead ends: 677 [2018-10-24 12:18:59,246 INFO L226 Difference]: Without dead ends: 624 [2018-10-24 12:18:59,247 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 199 SyntacticMatches, 24 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3478 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1626, Invalid=7304, Unknown=0, NotChecked=0, Total=8930 [2018-10-24 12:18:59,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2018-10-24 12:18:59,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 154. [2018-10-24 12:18:59,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:18:59,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-10-24 12:18:59,480 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-10-24 12:18:59,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:59,480 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-10-24 12:18:59,481 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-24 12:18:59,481 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-10-24 12:18:59,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:18:59,481 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:59,482 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 9, 8, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:59,482 INFO L424 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:59,482 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:59,482 INFO L82 PathProgramCache]: Analyzing trace with hash -855145283, now seen corresponding path program 44 times [2018-10-24 12:18:59,482 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:59,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:59,483 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:59,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:59,483 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:59,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:59,820 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 230 proven. 78 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:18:59,820 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:59,820 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:59,820 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:59,820 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:59,820 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:59,820 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:59,830 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:59,830 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:59,865 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-24 12:18:59,866 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:59,869 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:00,238 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 230 proven. 78 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:19:00,238 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:00,453 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 230 proven. 78 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:19:00,473 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:00,473 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 42 [2018-10-24 12:19:00,473 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:00,473 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:19:00,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:19:00,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=343, Invalid=1379, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:19:00,474 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 42 states. [2018-10-24 12:19:03,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:03,974 INFO L93 Difference]: Finished difference Result 727 states and 858 transitions. [2018-10-24 12:19:03,974 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-24 12:19:03,974 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 119 [2018-10-24 12:19:03,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:03,977 INFO L225 Difference]: With dead ends: 727 [2018-10-24 12:19:03,977 INFO L226 Difference]: Without dead ends: 674 [2018-10-24 12:19:03,978 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 200 SyntacticMatches, 24 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3084 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1471, Invalid=6539, Unknown=0, NotChecked=0, Total=8010 [2018-10-24 12:19:03,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 674 states. [2018-10-24 12:19:04,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 674 to 154. [2018-10-24 12:19:04,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:19:04,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-10-24 12:19:04,223 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-10-24 12:19:04,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:04,223 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-10-24 12:19:04,223 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:19:04,223 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-10-24 12:19:04,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:19:04,224 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:04,224 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 10, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:04,224 INFO L424 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:04,224 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:04,225 INFO L82 PathProgramCache]: Analyzing trace with hash 266259017, now seen corresponding path program 45 times [2018-10-24 12:19:04,225 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:04,225 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:04,225 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:04,225 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:04,225 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:04,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:04,663 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 230 proven. 92 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:19:04,663 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:04,663 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:04,664 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:04,664 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:04,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:04,664 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:04,671 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:19:04,672 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:19:04,700 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:19:04,700 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:04,702 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:05,065 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 230 proven. 92 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:19:05,065 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:05,846 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 230 proven. 92 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:19:05,866 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:05,866 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2018-10-24 12:19:05,866 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:05,866 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-24 12:19:05,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-24 12:19:05,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=342, Invalid=1298, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:19:05,867 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 41 states. [2018-10-24 12:19:09,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:09,258 INFO L93 Difference]: Finished difference Result 775 states and 918 transitions. [2018-10-24 12:19:09,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-10-24 12:19:09,259 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 119 [2018-10-24 12:19:09,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:09,261 INFO L225 Difference]: With dead ends: 775 [2018-10-24 12:19:09,261 INFO L226 Difference]: Without dead ends: 722 [2018-10-24 12:19:09,262 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 201 SyntacticMatches, 24 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2569 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1275, Invalid=5531, Unknown=0, NotChecked=0, Total=6806 [2018-10-24 12:19:09,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 722 states. [2018-10-24 12:19:09,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 722 to 154. [2018-10-24 12:19:09,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:19:09,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-10-24 12:19:09,505 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-10-24 12:19:09,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:09,505 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-10-24 12:19:09,505 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-24 12:19:09,505 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-10-24 12:19:09,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:19:09,505 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:09,505 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:09,506 INFO L424 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:09,506 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:09,506 INFO L82 PathProgramCache]: Analyzing trace with hash -157154603, now seen corresponding path program 10 times [2018-10-24 12:19:09,506 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:09,506 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:09,506 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:09,506 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:09,507 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:09,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:09,800 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:19:09,801 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:09,801 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:09,801 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:09,801 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:09,801 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:09,801 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:09,808 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:09,808 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:19:09,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:09,843 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:10,175 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:19:10,176 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:10,399 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:19:10,418 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:10,419 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 40 [2018-10-24 12:19:10,419 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:10,419 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-24 12:19:10,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-24 12:19:10,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=345, Invalid=1215, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:19:10,420 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 40 states. [2018-10-24 12:19:13,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:13,579 INFO L93 Difference]: Finished difference Result 826 states and 982 transitions. [2018-10-24 12:19:13,580 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:19:13,580 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 119 [2018-10-24 12:19:13,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:13,583 INFO L225 Difference]: With dead ends: 826 [2018-10-24 12:19:13,583 INFO L226 Difference]: Without dead ends: 773 [2018-10-24 12:19:13,583 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 202 SyntacticMatches, 24 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1965 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1059, Invalid=4343, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:19:13,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 773 states. [2018-10-24 12:19:13,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 773 to 157. [2018-10-24 12:19:13,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-10-24 12:19:13,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 170 transitions. [2018-10-24 12:19:13,833 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 170 transitions. Word has length 119 [2018-10-24 12:19:13,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:13,833 INFO L481 AbstractCegarLoop]: Abstraction has 157 states and 170 transitions. [2018-10-24 12:19:13,833 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-24 12:19:13,833 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 170 transitions. [2018-10-24 12:19:13,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-10-24 12:19:13,834 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:13,834 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:13,834 INFO L424 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:13,834 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:13,834 INFO L82 PathProgramCache]: Analyzing trace with hash 777037143, now seen corresponding path program 20 times [2018-10-24 12:19:13,834 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:13,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:13,835 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:13,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:13,835 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:13,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:14,062 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 151 proven. 238 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-24 12:19:14,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:14,063 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:14,063 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:14,063 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:14,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:14,063 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:14,070 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:19:14,070 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:19:14,106 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:19:14,106 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:14,108 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:14,163 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:19:14,163 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:14,297 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:19:14,317 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:14,318 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 19 [2018-10-24 12:19:14,318 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:14,318 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:19:14,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:19:14,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=239, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:19:14,319 INFO L87 Difference]: Start difference. First operand 157 states and 170 transitions. Second operand 19 states. [2018-10-24 12:19:14,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:14,922 INFO L93 Difference]: Finished difference Result 167 states and 180 transitions. [2018-10-24 12:19:14,922 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:19:14,922 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 121 [2018-10-24 12:19:14,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:14,924 INFO L225 Difference]: With dead ends: 167 [2018-10-24 12:19:14,924 INFO L226 Difference]: Without dead ends: 165 [2018-10-24 12:19:14,924 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 230 SyntacticMatches, 23 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=116, Invalid=304, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:19:14,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2018-10-24 12:19:15,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 165. [2018-10-24 12:19:15,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-10-24 12:19:15,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 178 transitions. [2018-10-24 12:19:15,191 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 178 transitions. Word has length 121 [2018-10-24 12:19:15,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:15,191 INFO L481 AbstractCegarLoop]: Abstraction has 165 states and 178 transitions. [2018-10-24 12:19:15,191 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:19:15,191 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 178 transitions. [2018-10-24 12:19:15,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:19:15,192 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:15,192 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:15,192 INFO L424 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:15,192 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:15,192 INFO L82 PathProgramCache]: Analyzing trace with hash -1277952389, now seen corresponding path program 21 times [2018-10-24 12:19:15,192 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:15,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:15,193 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:15,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:15,193 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:15,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:15,531 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:15,531 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:15,532 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:15,532 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:15,532 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:15,532 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:15,532 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 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:15,539 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:19:15,539 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:19:15,577 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:19:15,578 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:15,580 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:16,215 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:16,215 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:16,504 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:16,524 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:16,525 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 54 [2018-10-24 12:19:16,525 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:16,525 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-24 12:19:16,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-24 12:19:16,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=575, Invalid=2287, Unknown=0, NotChecked=0, Total=2862 [2018-10-24 12:19:16,526 INFO L87 Difference]: Start difference. First operand 165 states and 178 transitions. Second operand 54 states. [2018-10-24 12:19:18,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:18,405 INFO L93 Difference]: Finished difference Result 294 states and 332 transitions. [2018-10-24 12:19:18,405 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:19:18,405 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 129 [2018-10-24 12:19:18,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:18,406 INFO L225 Difference]: With dead ends: 294 [2018-10-24 12:19:18,406 INFO L226 Difference]: Without dead ends: 237 [2018-10-24 12:19:18,407 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 208 SyntacticMatches, 26 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2990 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1225, Invalid=5095, Unknown=0, NotChecked=0, Total=6320 [2018-10-24 12:19:18,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2018-10-24 12:19:18,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 167. [2018-10-24 12:19:18,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:19:18,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-10-24 12:19:18,683 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-10-24 12:19:18,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:18,683 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-10-24 12:19:18,683 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-24 12:19:18,684 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-10-24 12:19:18,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:19:18,684 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:18,684 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 11, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:18,685 INFO L424 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:18,685 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:18,685 INFO L82 PathProgramCache]: Analyzing trace with hash -1178325753, now seen corresponding path program 46 times [2018-10-24 12:19:18,685 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:18,685 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:18,686 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:18,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:18,686 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:18,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:19,036 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 275 proven. 112 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:19,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:19,037 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:19,037 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:19,037 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:19,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:19,037 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 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:19,045 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:19,045 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:19:19,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:19,085 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:19,685 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 275 proven. 112 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:19,685 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:19,946 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 275 proven. 112 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:19,966 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:19,966 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 53 [2018-10-24 12:19:19,966 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:19,967 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-24 12:19:19,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-24 12:19:19,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=539, Invalid=2217, Unknown=0, NotChecked=0, Total=2756 [2018-10-24 12:19:19,967 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 53 states. [2018-10-24 12:19:22,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:22,354 INFO L93 Difference]: Finished difference Result 364 states and 415 transitions. [2018-10-24 12:19:22,354 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:19:22,355 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 129 [2018-10-24 12:19:22,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:22,356 INFO L225 Difference]: With dead ends: 364 [2018-10-24 12:19:22,356 INFO L226 Difference]: Without dead ends: 307 [2018-10-24 12:19:22,357 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 209 SyntacticMatches, 26 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3510 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1485, Invalid=6525, Unknown=0, NotChecked=0, Total=8010 [2018-10-24 12:19:22,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2018-10-24 12:19:22,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 167. [2018-10-24 12:19:22,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:19:22,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-10-24 12:19:22,652 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-10-24 12:19:22,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:22,652 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-10-24 12:19:22,652 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-24 12:19:22,653 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-10-24 12:19:22,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:19:22,653 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:22,653 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 10, 9, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:22,653 INFO L424 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:22,653 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:22,654 INFO L82 PathProgramCache]: Analyzing trace with hash -154759533, now seen corresponding path program 47 times [2018-10-24 12:19:22,654 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:22,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:22,654 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:22,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:22,654 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:22,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:23,008 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 275 proven. 96 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:23,008 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:23,008 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:23,008 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:23,008 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:23,008 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:23,008 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 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:23,015 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:19:23,015 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:19:23,061 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:19:23,061 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:23,063 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:23,917 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 275 proven. 96 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:23,917 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:24,185 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 275 proven. 96 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:24,205 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:24,205 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 52 [2018-10-24 12:19:24,205 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:24,205 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-24 12:19:24,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-24 12:19:24,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=507, Invalid=2145, Unknown=0, NotChecked=0, Total=2652 [2018-10-24 12:19:24,206 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 52 states. [2018-10-24 12:19:27,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:27,144 INFO L93 Difference]: Finished difference Result 432 states and 496 transitions. [2018-10-24 12:19:27,144 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-24 12:19:27,145 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 129 [2018-10-24 12:19:27,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:27,146 INFO L225 Difference]: With dead ends: 432 [2018-10-24 12:19:27,146 INFO L226 Difference]: Without dead ends: 375 [2018-10-24 12:19:27,147 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 210 SyntacticMatches, 26 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3996 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1729, Invalid=7777, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:19:27,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 375 states. [2018-10-24 12:19:27,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 375 to 167. [2018-10-24 12:19:27,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:19:27,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-10-24 12:19:27,457 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-10-24 12:19:27,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:27,457 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-10-24 12:19:27,457 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-24 12:19:27,457 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-10-24 12:19:27,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:19:27,458 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:27,458 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 9, 8, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:27,458 INFO L424 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:27,458 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:27,458 INFO L82 PathProgramCache]: Analyzing trace with hash 1607197471, now seen corresponding path program 48 times [2018-10-24 12:19:27,458 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:27,459 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:27,459 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:27,459 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:27,459 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:27,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:27,775 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 275 proven. 84 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:27,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:27,775 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:27,775 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:27,776 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:27,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:27,776 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 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:27,782 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:19:27,783 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:19:27,819 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:19:27,819 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:27,821 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:28,344 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 275 proven. 84 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:28,344 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:28,841 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 275 proven. 84 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:28,861 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:28,861 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 51 [2018-10-24 12:19:28,861 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:28,862 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-24 12:19:28,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-24 12:19:28,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=479, Invalid=2071, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:19:28,862 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 51 states. [2018-10-24 12:19:32,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:32,195 INFO L93 Difference]: Finished difference Result 498 states and 575 transitions. [2018-10-24 12:19:32,195 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-24 12:19:32,195 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 129 [2018-10-24 12:19:32,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:32,197 INFO L225 Difference]: With dead ends: 498 [2018-10-24 12:19:32,197 INFO L226 Difference]: Without dead ends: 441 [2018-10-24 12:19:32,198 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 211 SyntacticMatches, 26 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4398 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1933, Invalid=8779, Unknown=0, NotChecked=0, Total=10712 [2018-10-24 12:19:32,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2018-10-24 12:19:32,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 167. [2018-10-24 12:19:32,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:19:32,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-10-24 12:19:32,511 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-10-24 12:19:32,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:32,511 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-10-24 12:19:32,511 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-24 12:19:32,511 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-10-24 12:19:32,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:19:32,512 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:32,512 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 8, 7, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:32,512 INFO L424 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:32,512 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:32,513 INFO L82 PathProgramCache]: Analyzing trace with hash -285939029, now seen corresponding path program 49 times [2018-10-24 12:19:32,513 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:32,513 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:32,513 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:32,513 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:32,513 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:32,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:33,086 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 275 proven. 76 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:33,086 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:33,086 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:33,086 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:33,086 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:33,086 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:33,086 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:33,094 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:33,094 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:19:33,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:33,131 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:33,841 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 275 proven. 76 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:33,841 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:34,226 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 275 proven. 76 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:34,247 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:34,247 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 50 [2018-10-24 12:19:34,247 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:34,247 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-24 12:19:34,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-24 12:19:34,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=455, Invalid=1995, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:19:34,248 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 50 states. [2018-10-24 12:19:37,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:37,831 INFO L93 Difference]: Finished difference Result 562 states and 652 transitions. [2018-10-24 12:19:37,832 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-24 12:19:37,832 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 129 [2018-10-24 12:19:37,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:37,834 INFO L225 Difference]: With dead ends: 562 [2018-10-24 12:19:37,834 INFO L226 Difference]: Without dead ends: 505 [2018-10-24 12:19:37,835 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 212 SyntacticMatches, 26 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4678 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2079, Invalid=9477, Unknown=0, NotChecked=0, Total=11556 [2018-10-24 12:19:37,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2018-10-24 12:19:38,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 167. [2018-10-24 12:19:38,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:19:38,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-10-24 12:19:38,179 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-10-24 12:19:38,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:38,179 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-10-24 12:19:38,180 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-24 12:19:38,180 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-10-24 12:19:38,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:19:38,180 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:38,180 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 7, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:38,180 INFO L424 AbstractCegarLoop]: === Iteration 84 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:38,180 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:38,181 INFO L82 PathProgramCache]: Analyzing trace with hash 798123319, now seen corresponding path program 50 times [2018-10-24 12:19:38,181 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:38,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:38,181 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:38,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:38,181 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:38,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:38,522 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 275 proven. 72 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:38,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:38,522 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:38,522 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:38,522 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:38,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:38,522 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:38,531 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:19:38,531 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:19:38,576 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:19:38,576 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:38,579 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:39,382 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 275 proven. 72 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:39,383 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:39,663 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 275 proven. 72 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:39,683 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:39,683 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 49 [2018-10-24 12:19:39,683 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:39,684 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-24 12:19:39,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-24 12:19:39,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=1917, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:19:39,684 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 49 states. [2018-10-24 12:19:43,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:43,615 INFO L93 Difference]: Finished difference Result 624 states and 727 transitions. [2018-10-24 12:19:43,616 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-24 12:19:43,616 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 129 [2018-10-24 12:19:43,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:43,618 INFO L225 Difference]: With dead ends: 624 [2018-10-24 12:19:43,618 INFO L226 Difference]: Without dead ends: 567 [2018-10-24 12:19:43,619 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 213 SyntacticMatches, 26 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4810 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2155, Invalid=9835, Unknown=0, NotChecked=0, Total=11990 [2018-10-24 12:19:43,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 567 states. [2018-10-24 12:19:43,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 567 to 167. [2018-10-24 12:19:43,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:19:43,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-10-24 12:19:43,946 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-10-24 12:19:43,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:43,946 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-10-24 12:19:43,946 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-24 12:19:43,946 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-10-24 12:19:43,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:19:43,947 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:43,947 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 7, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:43,947 INFO L424 AbstractCegarLoop]: === Iteration 85 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:43,947 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:43,947 INFO L82 PathProgramCache]: Analyzing trace with hash -903540029, now seen corresponding path program 51 times [2018-10-24 12:19:43,947 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:43,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:43,948 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:43,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:43,948 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:43,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:44,366 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 275 proven. 72 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:44,366 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:44,366 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:44,366 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:44,366 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:44,366 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:44,367 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 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:44,375 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:19:44,375 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:19:44,410 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:19:44,410 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:44,413 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:44,999 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 275 proven. 72 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:44,999 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:45,254 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 275 proven. 72 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:45,285 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:45,285 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 48 [2018-10-24 12:19:45,285 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:45,285 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-24 12:19:45,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-24 12:19:45,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=1837, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:19:45,286 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 48 states. [2018-10-24 12:19:49,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:49,409 INFO L93 Difference]: Finished difference Result 684 states and 800 transitions. [2018-10-24 12:19:49,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-10-24 12:19:49,409 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 129 [2018-10-24 12:19:49,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:49,411 INFO L225 Difference]: With dead ends: 684 [2018-10-24 12:19:49,411 INFO L226 Difference]: Without dead ends: 627 [2018-10-24 12:19:49,412 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 214 SyntacticMatches, 26 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4780 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2155, Invalid=9835, Unknown=0, NotChecked=0, Total=11990 [2018-10-24 12:19:49,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 627 states. [2018-10-24 12:19:49,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 627 to 167. [2018-10-24 12:19:49,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:19:49,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-10-24 12:19:49,742 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-10-24 12:19:49,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:49,742 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-10-24 12:19:49,742 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-24 12:19:49,742 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-10-24 12:19:49,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:19:49,743 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:49,743 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 8, 7, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:49,744 INFO L424 AbstractCegarLoop]: === Iteration 86 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:49,744 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:49,744 INFO L82 PathProgramCache]: Analyzing trace with hash 274576207, now seen corresponding path program 52 times [2018-10-24 12:19:49,744 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:49,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:49,745 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:49,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:49,745 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:49,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:50,057 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 275 proven. 76 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:50,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:50,058 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:50,058 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:50,058 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:50,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:50,058 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 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:50,065 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:50,065 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:19:50,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:50,104 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:50,568 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 275 proven. 76 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:50,569 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:50,834 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 275 proven. 76 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:50,855 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:50,855 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 47 [2018-10-24 12:19:50,855 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:50,856 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-24 12:19:50,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-24 12:19:50,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=407, Invalid=1755, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:19:50,856 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 47 states. [2018-10-24 12:19:55,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:55,313 INFO L93 Difference]: Finished difference Result 742 states and 871 transitions. [2018-10-24 12:19:55,313 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-10-24 12:19:55,313 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 129 [2018-10-24 12:19:55,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:55,316 INFO L225 Difference]: With dead ends: 742 [2018-10-24 12:19:55,316 INFO L226 Difference]: Without dead ends: 685 [2018-10-24 12:19:55,317 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 215 SyntacticMatches, 26 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4582 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2079, Invalid=9477, Unknown=0, NotChecked=0, Total=11556 [2018-10-24 12:19:55,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 685 states. [2018-10-24 12:19:55,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 685 to 167. [2018-10-24 12:19:55,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:19:55,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-10-24 12:19:55,676 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-10-24 12:19:55,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:55,676 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-10-24 12:19:55,676 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-24 12:19:55,676 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-10-24 12:19:55,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:19:55,677 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:55,677 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 9, 8, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:55,677 INFO L424 AbstractCegarLoop]: === Iteration 87 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:55,677 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:55,677 INFO L82 PathProgramCache]: Analyzing trace with hash -1994586405, now seen corresponding path program 53 times [2018-10-24 12:19:55,677 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:55,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:55,678 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:55,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:55,678 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:55,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:56,224 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 275 proven. 84 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:56,224 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:56,224 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:56,224 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:56,224 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:56,225 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:56,225 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 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:56,231 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:19:56,232 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:19:56,275 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:19:56,276 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:56,279 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:56,715 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 275 proven. 84 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:56,715 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:56,971 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 275 proven. 84 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:19:56,991 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:56,992 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 46 [2018-10-24 12:19:56,992 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:56,992 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-24 12:19:56,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-24 12:19:56,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=399, Invalid=1671, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:19:56,993 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 46 states. [2018-10-24 12:20:01,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:20:01,608 INFO L93 Difference]: Finished difference Result 798 states and 940 transitions. [2018-10-24 12:20:01,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-24 12:20:01,608 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 129 [2018-10-24 12:20:01,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:20:01,611 INFO L225 Difference]: With dead ends: 798 [2018-10-24 12:20:01,611 INFO L226 Difference]: Without dead ends: 741 [2018-10-24 12:20:01,612 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 216 SyntacticMatches, 26 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4218 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1933, Invalid=8779, Unknown=0, NotChecked=0, Total=10712 [2018-10-24 12:20:01,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 741 states. [2018-10-24 12:20:01,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 741 to 167. [2018-10-24 12:20:01,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:20:01,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-10-24 12:20:01,949 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-10-24 12:20:01,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:20:01,949 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-10-24 12:20:01,949 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-24 12:20:01,949 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-10-24 12:20:01,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:20:01,950 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:20:01,950 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 10, 9, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:20:01,950 INFO L424 AbstractCegarLoop]: === Iteration 88 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:20:01,950 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:20:01,950 INFO L82 PathProgramCache]: Analyzing trace with hash 2087964007, now seen corresponding path program 54 times [2018-10-24 12:20:01,950 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:20:01,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:01,951 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:20:01,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:01,951 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:20:01,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:02,259 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 275 proven. 96 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:20:02,259 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:02,259 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:20:02,259 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:20:02,260 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:20:02,260 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:02,260 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 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:20:02,268 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:20:02,268 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:20:02,305 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:20:02,305 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:20:02,308 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:20:02,757 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 275 proven. 96 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:20:02,757 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:20:03,006 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 275 proven. 96 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:20:03,028 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:20:03,029 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 45 [2018-10-24 12:20:03,029 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:20:03,029 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:20:03,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:20:03,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=1585, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:20:03,030 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 45 states. [2018-10-24 12:20:07,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:20:07,519 INFO L93 Difference]: Finished difference Result 852 states and 1007 transitions. [2018-10-24 12:20:07,527 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-24 12:20:07,527 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 129 [2018-10-24 12:20:07,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:20:07,531 INFO L225 Difference]: With dead ends: 852 [2018-10-24 12:20:07,531 INFO L226 Difference]: Without dead ends: 795 [2018-10-24 12:20:07,532 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 217 SyntacticMatches, 26 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3702 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1729, Invalid=7777, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:20:07,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 795 states. [2018-10-24 12:20:07,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 795 to 167. [2018-10-24 12:20:07,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:20:07,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-10-24 12:20:07,971 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-10-24 12:20:07,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:20:07,971 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-10-24 12:20:07,971 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:20:07,972 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-10-24 12:20:07,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:20:07,972 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:20:07,972 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 11, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:20:07,972 INFO L424 AbstractCegarLoop]: === Iteration 89 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:20:07,972 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:20:07,973 INFO L82 PathProgramCache]: Analyzing trace with hash 2141374195, now seen corresponding path program 55 times [2018-10-24 12:20:07,973 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:20:07,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:07,973 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:20:07,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:07,973 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:20:07,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:08,521 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 275 proven. 112 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:20:08,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:08,521 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:20:08,521 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:20:08,521 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:20:08,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:08,522 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:20:08,531 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:20:08,531 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:20:08,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:08,568 INFO L273 TraceCheckSpWp]: Computing forward predicates... Received shutdown request... [2018-10-24 12:20:08,786 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-24 12:20:08,987 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:20:08,987 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-24 12:20:08,992 WARN L205 ceAbstractionStarter]: Timeout [2018-10-24 12:20:08,993 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:20:08 BoogieIcfgContainer [2018-10-24 12:20:08,993 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:20:08,994 INFO L168 Benchmark]: Toolchain (without parser) took 235515.29 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 654.3 MB). Free memory was 1.4 GB in the beginning and 1.7 GB in the end (delta: -234.4 MB). Peak memory consumption was 419.9 MB. Max. memory is 7.1 GB. [2018-10-24 12:20:08,994 INFO L168 Benchmark]: CDTParser took 0.16 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. [2018-10-24 12:20:08,995 INFO L168 Benchmark]: CACSL2BoogieTranslator took 319.29 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:20:08,995 INFO L168 Benchmark]: Boogie Procedure Inliner took 19.72 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:20:08,995 INFO L168 Benchmark]: Boogie Preprocessor took 24.11 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:20:08,996 INFO L168 Benchmark]: RCFGBuilder took 510.41 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 734.0 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -773.4 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:20:08,996 INFO L168 Benchmark]: TraceAbstraction took 234637.41 ms. Allocated memory was 2.3 GB in the beginning and 2.2 GB in the end (delta: -79.7 MB). Free memory was 2.2 GB in the beginning and 1.7 GB in the end (delta: 528.4 MB). Peak memory consumption was 448.7 MB. Max. memory is 7.1 GB. [2018-10-24 12:20:08,999 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 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 319.29 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 19.72 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 24.11 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 510.41 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 734.0 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -773.4 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 234637.41 ms. Allocated memory was 2.3 GB in the beginning and 2.2 GB in the end (delta: -79.7 MB). Free memory was 2.2 GB in the beginning and 1.7 GB in the end (delta: 528.4 MB). Peak memory consumption was 448.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 130 with TraceHistMax 12,while TraceCheckSpWp was constructing forward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 38 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. TIMEOUT Result, 234.5s OverallTime, 89 OverallIterations, 12 TraceHistogramMax, 128.6s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 4216 SDtfs, 11312 SDslu, 35247 SDs, 0 SdLazy, 32155 SolverSat, 7532 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 31.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 19520 GetRequests, 12916 SyntacticMatches, 1540 SemanticMatches, 5064 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149303 ImplicationChecksByTransitivity, 119.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=167occurred in iteration=79, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 1.5s AbstIntTime, 3 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 10.9s AutomataMinimizationTime, 88 MinimizatonAttempts, 16662 StatesRemovedByMinimization, 77 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.4s SsaConstructionTime, 2.8s SatisfiabilityAnalysisTime, 85.3s InterpolantComputationTime, 15427 NumberOfCodeBlocks, 15427 NumberOfCodeBlocksAsserted, 404 NumberOfCheckSat, 22854 ConstructedInterpolants, 0 QuantifiedInterpolants, 9084200 SizeOfPredicates, 545 NumberOfNonLiveVariables, 16590 ConjunctsInSsa, 1740 ConjunctsInUnsatCore, 258 InterpolantComputations, 3 PerfectInterpolantSequences, 60967/74867 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown