java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 09:07:31,602 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 09:07:31,604 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 09:07:31,615 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 09:07:31,616 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 09:07:31,617 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 09:07:31,618 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 09:07:31,620 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 09:07:31,622 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 09:07:31,622 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 09:07:31,623 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 09:07:31,624 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 09:07:31,624 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 09:07:31,625 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 09:07:31,627 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 09:07:31,627 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 09:07:31,628 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 09:07:31,630 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 09:07:31,632 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 09:07:31,634 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 09:07:31,635 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 09:07:31,636 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 09:07:31,638 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-27 09:07:31,654 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-27 09:07:31,685 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 09:07:31,685 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 09:07:31,686 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 09:07:31,686 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 09:07:31,686 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 09:07:31,686 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 09:07:31,687 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-27 09:07:31,687 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 09:07:31,687 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 09:07:31,687 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 09:07:31,687 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 09:07:31,688 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 09:07:31,688 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 09:07:31,688 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-27 09:07:31,688 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 09:07:31,689 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 09:07:31,690 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 09:07:31,690 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 09:07:31,690 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 09:07:31,690 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 09:07:31,690 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 09:07:31,691 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 09:07:31,691 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 09:07:31,691 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 09:07:31,691 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 09:07:31,691 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 09:07:31,692 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 09:07:31,692 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 09:07:31,692 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 09:07:31,693 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 09:07:31,693 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 09:07:31,693 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 09:07:31,693 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 09:07:31,693 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 09:07:31,693 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 09:07:31,694 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 09:07:31,741 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 09:07:31,753 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 09:07:31,757 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 09:07:31,758 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 09:07:31,759 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 09:07:31,759 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call1.i [2018-10-27 09:07:31,821 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/3a09e8634/c2689d0cf3384fffb3de9c64bd03e7ed/FLAG7fa8a5a93 [2018-10-27 09:07:32,227 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 09:07:32,228 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call1.i [2018-10-27 09:07:32,233 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/3a09e8634/c2689d0cf3384fffb3de9c64bd03e7ed/FLAG7fa8a5a93 [2018-10-27 09:07:32,247 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/3a09e8634/c2689d0cf3384fffb3de9c64bd03e7ed [2018-10-27 09:07:32,259 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 09:07:32,260 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 09:07:32,261 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 09:07:32,261 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 09:07:32,265 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 09:07:32,266 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:07:32" (1/1) ... [2018-10-27 09:07:32,270 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1598a2f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:32, skipping insertion in model container [2018-10-27 09:07:32,270 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:07:32" (1/1) ... [2018-10-27 09:07:32,280 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 09:07:32,300 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 09:07:32,467 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:07:32,471 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 09:07:32,487 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:07:32,503 INFO L193 MainTranslator]: Completed translation [2018-10-27 09:07:32,503 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:32 WrapperNode [2018-10-27 09:07:32,503 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 09:07:32,504 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 09:07:32,504 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 09:07:32,504 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 09:07:32,513 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:32" (1/1) ... [2018-10-27 09:07:32,518 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:32" (1/1) ... [2018-10-27 09:07:32,523 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 09:07:32,523 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 09:07:32,523 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 09:07:32,524 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 09:07:32,531 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:32" (1/1) ... [2018-10-27 09:07:32,531 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:32" (1/1) ... [2018-10-27 09:07:32,532 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:32" (1/1) ... [2018-10-27 09:07:32,532 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:32" (1/1) ... [2018-10-27 09:07:32,535 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:32" (1/1) ... [2018-10-27 09:07:32,541 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:32" (1/1) ... [2018-10-27 09:07:32,542 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:32" (1/1) ... [2018-10-27 09:07:32,543 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 09:07:32,544 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 09:07:32,544 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 09:07:32,544 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 09:07:32,545 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:32" (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 [2018-10-27 09:07:32,603 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 09:07:32,603 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 09:07:32,603 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 09:07:32,603 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 09:07:32,604 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 09:07:32,604 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 09:07:32,604 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 09:07:32,604 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 09:07:32,892 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 09:07:32,893 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:07:32 BoogieIcfgContainer [2018-10-27 09:07:32,893 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 09:07:32,894 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 09:07:32,894 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 09:07:32,897 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 09:07:32,898 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 09:07:32" (1/3) ... [2018-10-27 09:07:32,898 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f8775fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:07:32, skipping insertion in model container [2018-10-27 09:07:32,899 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:32" (2/3) ... [2018-10-27 09:07:32,899 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f8775fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:07:32, skipping insertion in model container [2018-10-27 09:07:32,899 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:07:32" (3/3) ... [2018-10-27 09:07:32,901 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_false-unreach-call1.i [2018-10-27 09:07:32,910 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 09:07:32,918 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 09:07:32,934 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 09:07:32,965 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 09:07:32,965 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 09:07:32,965 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 09:07:32,965 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 09:07:32,965 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 09:07:32,966 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 09:07:32,966 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 09:07:32,966 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 09:07:32,984 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-10-27 09:07:32,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-27 09:07:32,990 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:32,991 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:32,995 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:33,000 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:33,001 INFO L82 PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times [2018-10-27 09:07:33,003 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:33,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:33,053 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:33,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:33,053 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:33,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:33,112 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:33,115 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:07:33,115 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 09:07:33,115 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:07:33,120 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 09:07:33,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 09:07:33,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 09:07:33,135 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-10-27 09:07:33,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:33,157 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-10-27 09:07:33,157 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 09:07:33,158 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-27 09:07:33,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:33,167 INFO L225 Difference]: With dead ends: 29 [2018-10-27 09:07:33,167 INFO L226 Difference]: Without dead ends: 12 [2018-10-27 09:07:33,171 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 [2018-10-27 09:07:33,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-27 09:07:33,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-27 09:07:33,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-27 09:07:33,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-27 09:07:33,206 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-10-27 09:07:33,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:33,206 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-27 09:07:33,207 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 09:07:33,207 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-27 09:07:33,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-27 09:07:33,207 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:33,208 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:33,208 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:33,208 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:33,209 INFO L82 PathProgramCache]: Analyzing trace with hash -571410792, now seen corresponding path program 1 times [2018-10-27 09:07:33,209 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:33,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:33,210 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:33,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:33,211 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:33,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:33,373 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:33,374 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:07:33,374 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 09:07:33,374 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:07:33,376 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 09:07:33,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 09:07:33,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 09:07:33,378 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2018-10-27 09:07:33,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:33,426 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-27 09:07:33,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 09:07:33,427 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-27 09:07:33,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:33,428 INFO L225 Difference]: With dead ends: 19 [2018-10-27 09:07:33,428 INFO L226 Difference]: Without dead ends: 14 [2018-10-27 09:07:33,429 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 09:07:33,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-27 09:07:33,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-27 09:07:33,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-27 09:07:33,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-27 09:07:33,434 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-27 09:07:33,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:33,434 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-27 09:07:33,434 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 09:07:33,434 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-27 09:07:33,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-27 09:07:33,435 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:33,435 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:33,436 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:33,436 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:33,436 INFO L82 PathProgramCache]: Analyzing trace with hash 1625028318, now seen corresponding path program 1 times [2018-10-27 09:07:33,436 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:33,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:33,438 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:33,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:33,438 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:33,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:33,592 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:33,592 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:33,592 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:33,593 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-10-27 09:07:33,595 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [20], [23], [25], [31], [32], [33], [35] [2018-10-27 09:07:33,626 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-27 09:07:33,626 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 09:07:33,797 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 09:07:33,801 INFO L272 AbstractInterpreter]: Visited 12 different actions 18 times. Merged at 2 different actions 4 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-10-27 09:07:33,855 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:33,856 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 09:07:33,857 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:33,857 INFO 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 [2018-10-27 09:07:33,874 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:33,875 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:07:33,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:33,920 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:34,027 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:34,027 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:34,155 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:34,183 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:34,183 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-27 09:07:34,183 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:34,184 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-27 09:07:34,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-27 09:07:34,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-27 09:07:34,185 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2018-10-27 09:07:34,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:34,216 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-27 09:07:34,218 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 09:07:34,218 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-10-27 09:07:34,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:34,219 INFO L225 Difference]: With dead ends: 21 [2018-10-27 09:07:34,219 INFO L226 Difference]: Without dead ends: 16 [2018-10-27 09:07:34,219 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-27 09:07:34,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-27 09:07:34,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-27 09:07:34,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-27 09:07:34,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-27 09:07:34,224 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-27 09:07:34,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:34,224 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-27 09:07:34,224 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-27 09:07:34,224 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-27 09:07:34,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-27 09:07:34,225 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:34,225 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:34,226 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:34,226 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:34,227 INFO L82 PathProgramCache]: Analyzing trace with hash -720896604, now seen corresponding path program 2 times [2018-10-27 09:07:34,227 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:34,228 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:34,228 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:34,228 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:34,228 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:34,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:34,396 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:34,396 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:34,396 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:34,397 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:34,397 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:34,397 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:34,397 INFO 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 [2018-10-27 09:07:34,415 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:07:34,415 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:07:34,473 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 09:07:34,473 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:34,475 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:34,508 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:34,509 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:34,764 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:34,784 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:34,785 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-27 09:07:34,785 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:34,785 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 09:07:34,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 09:07:34,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-27 09:07:34,788 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 5 states. [2018-10-27 09:07:34,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:34,824 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-27 09:07:34,825 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 09:07:34,825 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-10-27 09:07:34,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:34,827 INFO L225 Difference]: With dead ends: 23 [2018-10-27 09:07:34,827 INFO L226 Difference]: Without dead ends: 18 [2018-10-27 09:07:34,828 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-27 09:07:34,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-27 09:07:34,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-27 09:07:34,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-27 09:07:34,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-27 09:07:34,833 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-27 09:07:34,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:34,833 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-27 09:07:34,833 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 09:07:34,833 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-27 09:07:34,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-27 09:07:34,835 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:34,835 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:34,836 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:34,836 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:34,836 INFO L82 PathProgramCache]: Analyzing trace with hash -296916246, now seen corresponding path program 3 times [2018-10-27 09:07:34,836 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:34,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:34,837 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:34,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:34,838 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:34,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:34,977 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:34,977 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:34,978 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:34,978 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:34,978 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:34,978 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:34,978 INFO 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 [2018-10-27 09:07:34,986 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:07:34,986 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:07:34,997 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:07:34,998 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:35,000 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:35,029 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:35,030 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:35,270 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:35,290 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:35,290 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-27 09:07:35,291 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:35,291 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 09:07:35,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 09:07:35,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-27 09:07:35,292 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2018-10-27 09:07:35,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:35,349 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-27 09:07:35,349 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-27 09:07:35,349 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2018-10-27 09:07:35,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:35,351 INFO L225 Difference]: With dead ends: 25 [2018-10-27 09:07:35,351 INFO L226 Difference]: Without dead ends: 20 [2018-10-27 09:07:35,352 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-27 09:07:35,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-27 09:07:35,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-27 09:07:35,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-27 09:07:35,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-27 09:07:35,356 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-27 09:07:35,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:35,357 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-27 09:07:35,357 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 09:07:35,357 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-27 09:07:35,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-27 09:07:35,358 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:35,358 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:35,359 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:35,359 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:35,359 INFO L82 PathProgramCache]: Analyzing trace with hash -873685328, now seen corresponding path program 4 times [2018-10-27 09:07:35,359 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:35,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:35,360 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:35,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:35,361 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:35,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:35,514 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:35,515 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:35,515 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:35,515 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:35,515 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:35,515 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:35,516 INFO 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 [2018-10-27 09:07:35,525 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:35,526 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:07:35,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:35,539 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:35,555 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:35,555 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:36,034 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:36,054 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:36,054 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-27 09:07:36,054 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:36,055 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-27 09:07:36,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-27 09:07:36,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-27 09:07:36,056 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 7 states. [2018-10-27 09:07:36,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:36,102 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-27 09:07:36,104 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 09:07:36,104 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-10-27 09:07:36,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:36,105 INFO L225 Difference]: With dead ends: 27 [2018-10-27 09:07:36,106 INFO L226 Difference]: Without dead ends: 22 [2018-10-27 09:07:36,106 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-27 09:07:36,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-27 09:07:36,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-27 09:07:36,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-27 09:07:36,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-27 09:07:36,111 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-27 09:07:36,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:36,111 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-27 09:07:36,111 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-27 09:07:36,111 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-27 09:07:36,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-27 09:07:36,112 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:36,112 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:36,112 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:36,113 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:36,113 INFO L82 PathProgramCache]: Analyzing trace with hash -1097991946, now seen corresponding path program 5 times [2018-10-27 09:07:36,113 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:36,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:36,114 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:36,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:36,114 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:36,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:36,289 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:36,289 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:36,289 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:36,289 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:36,289 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:36,289 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:36,290 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 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 [2018-10-27 09:07:36,297 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:07:36,297 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:07:36,331 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 09:07:36,332 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:36,334 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:36,356 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:36,356 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:36,506 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:36,527 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:36,528 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-27 09:07:36,528 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:36,528 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 09:07:36,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 09:07:36,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-27 09:07:36,529 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 8 states. [2018-10-27 09:07:36,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:36,609 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-10-27 09:07:36,610 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 09:07:36,610 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-10-27 09:07:36,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:36,611 INFO L225 Difference]: With dead ends: 29 [2018-10-27 09:07:36,611 INFO L226 Difference]: Without dead ends: 24 [2018-10-27 09:07:36,612 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-27 09:07:36,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-27 09:07:36,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-27 09:07:36,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-27 09:07:36,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-27 09:07:36,618 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-27 09:07:36,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:36,619 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-27 09:07:36,619 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 09:07:36,619 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-27 09:07:36,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-27 09:07:36,620 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:36,620 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:36,620 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:36,621 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:36,621 INFO L82 PathProgramCache]: Analyzing trace with hash -1908287044, now seen corresponding path program 6 times [2018-10-27 09:07:36,621 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:36,622 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:36,622 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:36,622 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:36,622 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:36,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:36,867 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:36,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:36,868 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:36,868 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:36,868 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:36,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:36,868 INFO 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 [2018-10-27 09:07:36,876 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:07:36,876 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:07:36,888 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:07:36,889 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:36,892 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:36,919 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:36,920 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:37,224 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:37,244 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:37,245 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-27 09:07:37,245 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:37,245 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 09:07:37,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 09:07:37,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-27 09:07:37,246 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 9 states. [2018-10-27 09:07:37,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:37,302 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-10-27 09:07:37,304 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 09:07:37,304 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-10-27 09:07:37,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:37,305 INFO L225 Difference]: With dead ends: 31 [2018-10-27 09:07:37,305 INFO L226 Difference]: Without dead ends: 26 [2018-10-27 09:07:37,306 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-27 09:07:37,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-27 09:07:37,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-27 09:07:37,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-27 09:07:37,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-27 09:07:37,311 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-10-27 09:07:37,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:37,311 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-27 09:07:37,311 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 09:07:37,312 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-27 09:07:37,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-27 09:07:37,312 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:37,312 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:37,313 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:37,313 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:37,313 INFO L82 PathProgramCache]: Analyzing trace with hash 1082171650, now seen corresponding path program 7 times [2018-10-27 09:07:37,313 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:37,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:37,314 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:37,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:37,315 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:37,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:37,471 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:37,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:37,471 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:37,472 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:37,472 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:37,472 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:37,472 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 09:07:37,489 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:37,489 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:07:37,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:37,505 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:37,513 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:37,514 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:37,809 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:37,831 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:37,831 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-27 09:07:37,831 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:37,832 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 09:07:37,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 09:07:37,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-27 09:07:37,833 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 10 states. [2018-10-27 09:07:37,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:37,945 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-27 09:07:37,949 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 09:07:37,949 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2018-10-27 09:07:37,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:37,949 INFO L225 Difference]: With dead ends: 33 [2018-10-27 09:07:37,950 INFO L226 Difference]: Without dead ends: 28 [2018-10-27 09:07:37,950 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-27 09:07:37,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-27 09:07:37,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-27 09:07:37,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-27 09:07:37,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-27 09:07:37,955 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-10-27 09:07:37,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:37,955 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-27 09:07:37,955 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 09:07:37,955 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-27 09:07:37,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-27 09:07:37,956 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:37,956 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:37,956 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:37,957 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:37,957 INFO L82 PathProgramCache]: Analyzing trace with hash 1579855560, now seen corresponding path program 8 times [2018-10-27 09:07:37,957 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:37,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:37,958 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:37,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:37,958 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:37,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:38,167 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:38,167 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:38,167 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:38,168 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:38,168 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:38,168 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:38,168 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 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 [2018-10-27 09:07:38,178 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:07:38,178 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:07:38,911 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 09:07:38,912 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:38,926 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:38,937 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:38,937 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:39,230 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:39,251 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:39,252 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-27 09:07:39,252 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:39,252 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 09:07:39,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 09:07:39,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-27 09:07:39,253 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 11 states. [2018-10-27 09:07:39,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:39,339 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-10-27 09:07:39,339 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 09:07:39,339 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2018-10-27 09:07:39,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:39,340 INFO L225 Difference]: With dead ends: 35 [2018-10-27 09:07:39,341 INFO L226 Difference]: Without dead ends: 30 [2018-10-27 09:07:39,341 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-27 09:07:39,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-27 09:07:39,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-27 09:07:39,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-27 09:07:39,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-27 09:07:39,346 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-10-27 09:07:39,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:39,347 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-27 09:07:39,347 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 09:07:39,347 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-27 09:07:39,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-27 09:07:39,348 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:39,348 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:39,348 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:39,348 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:39,348 INFO L82 PathProgramCache]: Analyzing trace with hash -1182244082, now seen corresponding path program 9 times [2018-10-27 09:07:39,349 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:39,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:39,350 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:39,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:39,350 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:39,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:39,646 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:39,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:39,647 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:39,647 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:39,648 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:39,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:39,648 INFO 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 [2018-10-27 09:07:39,656 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:07:39,656 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:07:39,685 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:07:39,685 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:39,687 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:39,706 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:39,707 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:40,021 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:40,041 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:40,041 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-27 09:07:40,041 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:40,042 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 09:07:40,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 09:07:40,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-27 09:07:40,042 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 12 states. [2018-10-27 09:07:40,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:40,231 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-10-27 09:07:40,232 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-27 09:07:40,232 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2018-10-27 09:07:40,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:40,233 INFO L225 Difference]: With dead ends: 37 [2018-10-27 09:07:40,233 INFO L226 Difference]: Without dead ends: 32 [2018-10-27 09:07:40,233 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 48 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-27 09:07:40,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-27 09:07:40,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-27 09:07:40,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-27 09:07:40,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-27 09:07:40,238 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-10-27 09:07:40,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:40,239 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-27 09:07:40,239 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 09:07:40,239 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-27 09:07:40,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-27 09:07:40,240 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:40,240 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:40,240 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:40,241 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:40,241 INFO L82 PathProgramCache]: Analyzing trace with hash -1270211116, now seen corresponding path program 10 times [2018-10-27 09:07:40,241 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:40,242 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:40,242 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:40,242 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:40,242 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:40,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:40,564 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:40,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:40,565 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:40,565 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:40,565 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:40,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:40,565 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 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 [2018-10-27 09:07:40,573 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:40,573 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:07:40,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:40,600 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:40,629 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:40,629 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:41,103 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:41,122 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:41,123 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-27 09:07:41,123 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:41,127 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 09:07:41,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 09:07:41,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-27 09:07:41,128 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 13 states. [2018-10-27 09:07:41,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:41,239 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-27 09:07:41,240 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 09:07:41,240 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2018-10-27 09:07:41,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:41,241 INFO L225 Difference]: With dead ends: 39 [2018-10-27 09:07:41,241 INFO L226 Difference]: Without dead ends: 34 [2018-10-27 09:07:41,242 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-27 09:07:41,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-27 09:07:41,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-27 09:07:41,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-27 09:07:41,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-27 09:07:41,248 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-10-27 09:07:41,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:41,248 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-27 09:07:41,248 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 09:07:41,248 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-27 09:07:41,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-27 09:07:41,249 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:41,250 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:41,250 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:41,250 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:41,250 INFO L82 PathProgramCache]: Analyzing trace with hash 92815130, now seen corresponding path program 11 times [2018-10-27 09:07:41,250 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:41,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:41,251 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:41,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:41,252 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:41,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:41,487 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:41,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:41,487 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:41,488 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:41,488 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:41,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:41,488 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 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 [2018-10-27 09:07:41,496 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:07:41,496 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:08:08,536 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 09:08:08,537 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:08,566 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:08,650 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:08,650 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:09,211 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:09,232 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:09,233 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-27 09:08:09,233 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:09,233 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 09:08:09,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 09:08:09,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-27 09:08:09,234 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 14 states. [2018-10-27 09:08:09,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:09,411 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-10-27 09:08:09,415 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 09:08:09,415 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 33 [2018-10-27 09:08:09,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:09,416 INFO L225 Difference]: With dead ends: 41 [2018-10-27 09:08:09,416 INFO L226 Difference]: Without dead ends: 36 [2018-10-27 09:08:09,417 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-27 09:08:09,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-27 09:08:09,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-27 09:08:09,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-27 09:08:09,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-27 09:08:09,421 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-10-27 09:08:09,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:09,421 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-27 09:08:09,421 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 09:08:09,421 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-27 09:08:09,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-27 09:08:09,422 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:09,422 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:09,423 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:09,423 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:09,423 INFO L82 PathProgramCache]: Analyzing trace with hash -3987744, now seen corresponding path program 12 times [2018-10-27 09:08:09,423 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:09,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:09,424 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:09,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:09,424 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:09,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:09,799 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:09,799 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:09,800 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:09,800 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:09,800 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:09,800 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:09,800 INFO 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 [2018-10-27 09:08:09,807 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:08:09,808 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:08:09,822 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:08:09,822 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:09,824 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:09,855 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:09,855 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:10,416 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:10,439 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:10,439 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-27 09:08:10,439 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:10,440 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 09:08:10,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 09:08:10,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-27 09:08:10,441 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 15 states. [2018-10-27 09:08:10,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:10,618 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-10-27 09:08:10,619 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-27 09:08:10,619 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 35 [2018-10-27 09:08:10,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:10,620 INFO L225 Difference]: With dead ends: 43 [2018-10-27 09:08:10,620 INFO L226 Difference]: Without dead ends: 38 [2018-10-27 09:08:10,621 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-27 09:08:10,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-27 09:08:10,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-27 09:08:10,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-27 09:08:10,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-27 09:08:10,625 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-10-27 09:08:10,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:10,625 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-27 09:08:10,626 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 09:08:10,626 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-27 09:08:10,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-27 09:08:10,627 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:10,627 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:10,627 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:10,627 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:10,627 INFO L82 PathProgramCache]: Analyzing trace with hash 1457730854, now seen corresponding path program 13 times [2018-10-27 09:08:10,628 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:10,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:10,629 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:10,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:10,629 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:10,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:10,838 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:10,838 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:10,838 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:10,838 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:10,838 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:10,838 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:10,839 INFO 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 [2018-10-27 09:08:10,846 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:10,846 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:08:10,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:10,860 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:10,902 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:10,903 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:11,599 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:11,621 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:11,621 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-27 09:08:11,621 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:11,622 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-27 09:08:11,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-27 09:08:11,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-27 09:08:11,623 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 16 states. [2018-10-27 09:08:12,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:12,011 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-27 09:08:12,011 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 09:08:12,011 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 37 [2018-10-27 09:08:12,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:12,013 INFO L225 Difference]: With dead ends: 45 [2018-10-27 09:08:12,013 INFO L226 Difference]: Without dead ends: 40 [2018-10-27 09:08:12,014 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-27 09:08:12,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-27 09:08:12,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-10-27 09:08:12,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-27 09:08:12,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-10-27 09:08:12,019 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-10-27 09:08:12,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:12,020 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-10-27 09:08:12,020 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-27 09:08:12,020 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-10-27 09:08:12,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-27 09:08:12,021 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:12,021 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:12,021 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:12,021 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:12,022 INFO L82 PathProgramCache]: Analyzing trace with hash 1714997740, now seen corresponding path program 14 times [2018-10-27 09:08:12,022 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:12,022 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:12,022 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:12,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:12,023 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:12,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:12,904 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:12,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:12,904 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:12,905 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:12,905 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:12,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:12,905 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 09:08:12,919 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:08:12,919 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:08:39,546 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-27 09:08:39,546 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:39,559 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:39,590 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:39,591 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:40,450 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:40,472 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:40,472 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-27 09:08:40,472 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:40,473 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 09:08:40,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 09:08:40,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-27 09:08:40,474 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 17 states. [2018-10-27 09:08:40,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:40,653 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-10-27 09:08:40,653 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 09:08:40,654 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2018-10-27 09:08:40,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:40,655 INFO L225 Difference]: With dead ends: 47 [2018-10-27 09:08:40,655 INFO L226 Difference]: Without dead ends: 42 [2018-10-27 09:08:40,656 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-27 09:08:40,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-27 09:08:40,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-27 09:08:40,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-27 09:08:40,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-27 09:08:40,661 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-10-27 09:08:40,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:40,661 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-27 09:08:40,661 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 09:08:40,661 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-27 09:08:40,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-27 09:08:40,662 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:40,662 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:40,662 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:40,663 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:40,663 INFO L82 PathProgramCache]: Analyzing trace with hash -159627982, now seen corresponding path program 15 times [2018-10-27 09:08:40,663 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:40,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:40,664 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:40,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:40,664 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:40,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:41,070 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:41,070 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:41,071 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:41,071 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:41,071 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:41,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:41,071 INFO 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 [2018-10-27 09:08:41,078 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:08:41,078 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:08:41,090 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:08:41,090 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:41,092 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:41,112 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:41,112 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:42,049 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:42,070 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:42,070 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-27 09:08:42,070 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:42,070 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 09:08:42,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 09:08:42,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 09:08:42,072 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 18 states. [2018-10-27 09:08:42,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:42,306 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-10-27 09:08:42,306 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-27 09:08:42,307 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 41 [2018-10-27 09:08:42,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:42,307 INFO L225 Difference]: With dead ends: 49 [2018-10-27 09:08:42,308 INFO L226 Difference]: Without dead ends: 44 [2018-10-27 09:08:42,309 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 09:08:42,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-10-27 09:08:42,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-10-27 09:08:42,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-27 09:08:42,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-27 09:08:42,315 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-10-27 09:08:42,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:42,315 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-27 09:08:42,315 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 09:08:42,315 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-27 09:08:42,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-27 09:08:42,316 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:42,316 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:42,316 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:42,317 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:42,317 INFO L82 PathProgramCache]: Analyzing trace with hash -2083649800, now seen corresponding path program 16 times [2018-10-27 09:08:42,317 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:42,318 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:42,318 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:42,318 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:42,318 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:42,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:42,613 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:42,614 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:42,614 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:42,614 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:42,614 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:42,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:42,615 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 09:08:42,622 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:42,622 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:08:42,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:42,637 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:42,661 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:42,661 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:43,549 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:43,570 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:43,570 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-27 09:08:43,570 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:43,570 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 09:08:43,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 09:08:43,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 09:08:43,572 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 19 states. [2018-10-27 09:08:43,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:43,948 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-27 09:08:43,948 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 09:08:43,948 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 43 [2018-10-27 09:08:43,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:43,949 INFO L225 Difference]: With dead ends: 51 [2018-10-27 09:08:43,950 INFO L226 Difference]: Without dead ends: 46 [2018-10-27 09:08:43,951 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 09:08:43,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-27 09:08:43,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-10-27 09:08:43,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-27 09:08:43,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-10-27 09:08:43,957 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 43 [2018-10-27 09:08:43,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:43,957 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-10-27 09:08:43,958 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 09:08:43,958 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-10-27 09:08:43,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-27 09:08:43,958 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:43,959 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:43,959 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:43,959 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:43,959 INFO L82 PathProgramCache]: Analyzing trace with hash 62287678, now seen corresponding path program 17 times [2018-10-27 09:08:43,959 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:43,960 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:43,960 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:43,960 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:43,960 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:43,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:44,313 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:44,314 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:44,314 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:44,314 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:44,314 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:44,314 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:44,314 INFO 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 [2018-10-27 09:08:44,322 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:08:44,322 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:09:05,655 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-27 09:09:05,655 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:09:05,981 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:09:06,007 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:06,008 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:09:06,905 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:06,925 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:09:06,926 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-27 09:09:06,926 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:09:06,926 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 09:09:06,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 09:09:06,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 09:09:06,927 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 20 states. [2018-10-27 09:09:07,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:09:07,457 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-10-27 09:09:07,457 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 09:09:07,458 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 45 [2018-10-27 09:09:07,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:09:07,458 INFO L225 Difference]: With dead ends: 53 [2018-10-27 09:09:07,459 INFO L226 Difference]: Without dead ends: 48 [2018-10-27 09:09:07,460 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 09:09:07,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-27 09:09:07,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-27 09:09:07,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-27 09:09:07,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-27 09:09:07,464 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 45 [2018-10-27 09:09:07,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:09:07,464 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-27 09:09:07,464 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 09:09:07,465 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-27 09:09:07,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-27 09:09:07,465 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:09:07,465 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:09:07,466 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:09:07,466 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:09:07,466 INFO L82 PathProgramCache]: Analyzing trace with hash 723901956, now seen corresponding path program 18 times [2018-10-27 09:09:07,466 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:09:07,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:07,467 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:09:07,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:07,467 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:09:07,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:07,860 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:07,860 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:07,860 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:09:07,860 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:09:07,861 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:09:07,861 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:07,861 INFO 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 [2018-10-27 09:09:07,872 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:09:07,873 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:09:07,889 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:09:07,890 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:09:07,891 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:09:07,904 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:07,904 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:09:09,156 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:09,177 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:09:09,177 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-27 09:09:09,177 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:09:09,177 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 09:09:09,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 09:09:09,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 09:09:09,179 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 21 states. [2018-10-27 09:09:09,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:09:09,482 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-10-27 09:09:09,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-27 09:09:09,483 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 47 [2018-10-27 09:09:09,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:09:09,483 INFO L225 Difference]: With dead ends: 55 [2018-10-27 09:09:09,484 INFO L226 Difference]: Without dead ends: 50 [2018-10-27 09:09:09,484 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 09:09:09,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-10-27 09:09:09,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-10-27 09:09:09,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-27 09:09:09,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-27 09:09:09,489 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 47 [2018-10-27 09:09:09,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:09:09,490 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-27 09:09:09,490 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 09:09:09,490 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-27 09:09:09,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-27 09:09:09,491 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:09:09,491 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:09:09,491 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:09:09,491 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:09:09,492 INFO L82 PathProgramCache]: Analyzing trace with hash 880063306, now seen corresponding path program 19 times [2018-10-27 09:09:09,492 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:09:09,495 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:09,495 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:09:09,495 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:09,495 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:09:09,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:10,765 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:10,765 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:10,765 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:09:10,765 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:09:10,765 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:09:10,766 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:10,766 INFO 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 [2018-10-27 09:09:10,778 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:09:10,778 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:09:10,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:10,793 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:09:10,821 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:10,821 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:09:12,162 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:12,184 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:09:12,184 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-27 09:09:12,184 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:09:12,185 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 09:09:12,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 09:09:12,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-27 09:09:12,186 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 22 states. [2018-10-27 09:09:12,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:09:12,784 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-27 09:09:12,784 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 09:09:12,784 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 49 [2018-10-27 09:09:12,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:09:12,785 INFO L225 Difference]: With dead ends: 57 [2018-10-27 09:09:12,785 INFO L226 Difference]: Without dead ends: 52 [2018-10-27 09:09:12,786 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-27 09:09:12,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-27 09:09:12,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-10-27 09:09:12,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-27 09:09:12,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-10-27 09:09:12,791 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 49 [2018-10-27 09:09:12,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:09:12,791 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-10-27 09:09:12,792 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 09:09:12,792 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-10-27 09:09:12,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-27 09:09:12,792 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:09:12,792 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:09:12,793 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:09:12,793 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:09:12,793 INFO L82 PathProgramCache]: Analyzing trace with hash 627265296, now seen corresponding path program 20 times [2018-10-27 09:09:12,793 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:09:12,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:12,794 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:09:12,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:12,794 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:09:12,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:13,372 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:13,372 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:13,372 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:09:13,372 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:09:13,373 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:09:13,373 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:13,373 INFO 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 [2018-10-27 09:09:13,380 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:09:13,380 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:11:28,503 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-27 09:11:28,503 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:11:28,742 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:11:28,798 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:28,799 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:11:32,996 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:33,016 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:11:33,017 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-27 09:11:33,017 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:11:33,017 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 09:11:33,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 09:11:33,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1366, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 09:11:33,018 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 23 states. [2018-10-27 09:11:33,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:11:33,358 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-10-27 09:11:33,362 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 09:11:33,362 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 51 [2018-10-27 09:11:33,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:11:33,362 INFO L225 Difference]: With dead ends: 59 [2018-10-27 09:11:33,363 INFO L226 Difference]: Without dead ends: 54 [2018-10-27 09:11:33,363 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 80 SyntacticMatches, 3 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=526, Invalid=1366, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 09:11:33,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-27 09:11:33,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-10-27 09:11:33,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-27 09:11:33,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-27 09:11:33,368 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 51 [2018-10-27 09:11:33,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:11:33,368 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-27 09:11:33,368 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 09:11:33,369 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-27 09:11:33,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-27 09:11:33,369 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:11:33,369 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:11:33,370 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:11:33,370 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:11:33,370 INFO L82 PathProgramCache]: Analyzing trace with hash -1793453738, now seen corresponding path program 21 times [2018-10-27 09:11:33,370 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:11:33,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:11:33,371 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:11:33,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:11:33,371 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:11:33,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:11:33,755 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:33,756 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:11:33,756 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:11:33,756 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:11:33,756 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:11:33,756 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:11:33,756 INFO 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 [2018-10-27 09:11:33,763 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:11:33,763 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:11:33,780 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:11:33,780 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:11:33,782 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:11:33,792 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:33,792 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:11:35,112 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:35,132 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:11:35,132 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-10-27 09:11:35,132 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:11:35,132 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 09:11:35,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 09:11:35,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 09:11:35,134 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 24 states. [2018-10-27 09:11:35,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:11:35,476 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-10-27 09:11:35,476 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-27 09:11:35,477 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 53 [2018-10-27 09:11:35,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:11:35,478 INFO L225 Difference]: With dead ends: 61 [2018-10-27 09:11:35,478 INFO L226 Difference]: Without dead ends: 56 [2018-10-27 09:11:35,479 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 09:11:35,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-10-27 09:11:35,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2018-10-27 09:11:35,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-27 09:11:35,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-10-27 09:11:35,483 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 53 [2018-10-27 09:11:35,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:11:35,484 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-10-27 09:11:35,484 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 09:11:35,484 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-10-27 09:11:35,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-27 09:11:35,485 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:11:35,485 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:11:35,485 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:11:35,485 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:11:35,485 INFO L82 PathProgramCache]: Analyzing trace with hash -232170980, now seen corresponding path program 22 times [2018-10-27 09:11:35,486 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:11:35,488 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:11:35,488 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:11:35,488 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:11:35,488 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:11:35,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:11:36,592 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:36,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:11:36,593 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:11:36,593 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:11:36,593 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:11:36,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:11:36,593 INFO 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 [2018-10-27 09:11:36,601 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:11:36,601 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:11:36,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:11:36,619 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:11:36,641 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:36,641 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:11:38,048 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:38,068 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:11:38,068 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-10-27 09:11:38,069 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:11:38,069 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-27 09:11:38,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-27 09:11:38,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-10-27 09:11:38,070 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 25 states. [2018-10-27 09:11:38,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:11:38,449 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-27 09:11:38,449 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 09:11:38,449 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 55 [2018-10-27 09:11:38,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:11:38,450 INFO L225 Difference]: With dead ends: 63 [2018-10-27 09:11:38,450 INFO L226 Difference]: Without dead ends: 58 [2018-10-27 09:11:38,451 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 87 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-10-27 09:11:38,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-27 09:11:38,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-10-27 09:11:38,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-27 09:11:38,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2018-10-27 09:11:38,456 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 55 [2018-10-27 09:11:38,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:11:38,456 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2018-10-27 09:11:38,456 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-27 09:11:38,456 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2018-10-27 09:11:38,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-27 09:11:38,457 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:11:38,457 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:11:38,457 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:11:38,457 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:11:38,458 INFO L82 PathProgramCache]: Analyzing trace with hash 1216973154, now seen corresponding path program 23 times [2018-10-27 09:11:38,458 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:11:38,458 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:11:38,458 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:11:38,459 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:11:38,459 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:11:38,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:11:39,893 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:39,893 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:11:39,894 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:11:39,894 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:11:39,894 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:11:39,894 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:11:39,894 INFO 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 [2018-10-27 09:11:39,901 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:11:39,901 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown