java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loops/insertion_sort_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 15:56:04,675 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 15:56:04,679 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 15:56:04,698 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 15:56:04,698 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 15:56:04,699 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 15:56:04,701 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 15:56:04,703 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 15:56:04,706 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 15:56:04,707 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 15:56:04,709 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 15:56:04,709 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 15:56:04,710 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 15:56:04,712 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 15:56:04,713 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 15:56:04,714 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 15:56:04,715 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 15:56:04,724 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 15:56:04,726 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 15:56:04,731 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 15:56:04,734 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 15:56:04,735 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 15:56:04,739 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-22 15:56:04,753 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-22 15:56:04,789 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 15:56:04,790 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 15:56:04,791 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 15:56:04,791 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 15:56:04,795 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 15:56:04,795 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 15:56:04,795 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 15:56:04,796 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 15:56:04,796 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 15:56:04,796 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 15:56:04,796 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 15:56:04,796 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 15:56:04,797 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 15:56:04,798 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 15:56:04,799 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 15:56:04,799 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 15:56:04,799 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 15:56:04,800 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 15:56:04,800 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 15:56:04,800 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 15:56:04,800 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 15:56:04,800 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 15:56:04,802 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 15:56:04,802 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 15:56:04,802 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 15:56:04,803 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 15:56:04,803 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 15:56:04,803 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 15:56:04,803 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 15:56:04,803 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 15:56:04,804 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 15:56:04,804 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 15:56:04,804 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 15:56:04,804 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 15:56:04,875 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 15:56:04,892 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 15:56:04,896 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 15:56:04,898 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 15:56:04,898 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 15:56:04,899 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops/insertion_sort_true-unreach-call_true-termination.i [2018-10-22 15:56:04,962 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/c17cb5fb8/1eebbd2b95e6475290b9b146c7b81480/FLAG38533fc63 [2018-10-22 15:56:05,482 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 15:56:05,482 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/insertion_sort_true-unreach-call_true-termination.i [2018-10-22 15:56:05,489 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/c17cb5fb8/1eebbd2b95e6475290b9b146c7b81480/FLAG38533fc63 [2018-10-22 15:56:05,511 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/c17cb5fb8/1eebbd2b95e6475290b9b146c7b81480 [2018-10-22 15:56:05,523 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 15:56:05,524 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 15:56:05,525 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 15:56:05,525 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 15:56:05,529 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 15:56:05,529 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 03:56:05" (1/1) ... [2018-10-22 15:56:05,532 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6a459524 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:05, skipping insertion in model container [2018-10-22 15:56:05,532 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 03:56:05" (1/1) ... [2018-10-22 15:56:05,541 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 15:56:05,562 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 15:56:05,805 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 15:56:05,810 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 15:56:05,844 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 15:56:05,871 INFO L193 MainTranslator]: Completed translation [2018-10-22 15:56:05,872 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:05 WrapperNode [2018-10-22 15:56:05,872 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 15:56:05,873 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 15:56:05,873 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 15:56:05,873 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 15:56:05,885 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:05" (1/1) ... [2018-10-22 15:56:05,898 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:05" (1/1) ... [2018-10-22 15:56:05,936 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 15:56:05,936 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 15:56:05,936 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 15:56:05,937 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 15:56:05,949 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:05" (1/1) ... [2018-10-22 15:56:05,949 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:05" (1/1) ... [2018-10-22 15:56:05,952 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:05" (1/1) ... [2018-10-22 15:56:05,953 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:05" (1/1) ... [2018-10-22 15:56:05,968 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:05" (1/1) ... [2018-10-22 15:56:05,977 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:05" (1/1) ... [2018-10-22 15:56:05,980 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:05" (1/1) ... [2018-10-22 15:56:05,992 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 15:56:05,993 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 15:56:05,993 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 15:56:05,993 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 15:56:05,994 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:05" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 15:56:06,137 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 15:56:06,137 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 15:56:06,137 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 15:56:06,137 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 15:56:06,137 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 15:56:06,137 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 15:56:06,138 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 15:56:06,138 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 15:56:06,602 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 15:56:06,603 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 03:56:06 BoogieIcfgContainer [2018-10-22 15:56:06,603 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 15:56:06,604 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 15:56:06,604 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 15:56:06,608 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 15:56:06,608 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 03:56:05" (1/3) ... [2018-10-22 15:56:06,609 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65314c3a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 03:56:06, skipping insertion in model container [2018-10-22 15:56:06,609 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:56:05" (2/3) ... [2018-10-22 15:56:06,609 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65314c3a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 03:56:06, skipping insertion in model container [2018-10-22 15:56:06,609 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 03:56:06" (3/3) ... [2018-10-22 15:56:06,611 INFO L112 eAbstractionObserver]: Analyzing ICFG insertion_sort_true-unreach-call_true-termination.i [2018-10-22 15:56:06,622 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 15:56:06,631 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 15:56:06,648 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 15:56:06,685 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 15:56:06,686 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 15:56:06,687 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 15:56:06,687 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 15:56:06,687 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 15:56:06,687 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 15:56:06,687 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 15:56:06,687 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 15:56:06,688 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 15:56:06,708 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states. [2018-10-22 15:56:06,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-22 15:56:06,715 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:06,716 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:06,718 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:06,725 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:06,725 INFO L82 PathProgramCache]: Analyzing trace with hash 277130583, now seen corresponding path program 1 times [2018-10-22 15:56:06,727 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:06,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:06,779 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:06,779 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:06,780 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:06,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:06,880 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:06,882 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 15:56:06,883 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 15:56:06,883 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 15:56:06,889 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 15:56:06,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 15:56:06,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 15:56:06,909 INFO L87 Difference]: Start difference. First operand 31 states. Second operand 2 states. [2018-10-22 15:56:06,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:06,935 INFO L93 Difference]: Finished difference Result 56 states and 71 transitions. [2018-10-22 15:56:06,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 15:56:06,936 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 14 [2018-10-22 15:56:06,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:06,946 INFO L225 Difference]: With dead ends: 56 [2018-10-22 15:56:06,946 INFO L226 Difference]: Without dead ends: 26 [2018-10-22 15:56:06,950 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 15:56:06,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-22 15:56:06,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-22 15:56:06,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-22 15:56:06,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2018-10-22 15:56:06,993 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 14 [2018-10-22 15:56:06,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:06,994 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2018-10-22 15:56:06,994 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 15:56:06,994 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2018-10-22 15:56:06,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-22 15:56:06,995 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:06,995 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:06,996 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:06,996 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:06,997 INFO L82 PathProgramCache]: Analyzing trace with hash -32556863, now seen corresponding path program 1 times [2018-10-22 15:56:06,997 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:06,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:06,998 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:06,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:06,999 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:07,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:07,273 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:07,273 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 15:56:07,274 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-22 15:56:07,274 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 15:56:07,275 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 15:56:07,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 15:56:07,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-10-22 15:56:07,276 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 5 states. [2018-10-22 15:56:07,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:07,423 INFO L93 Difference]: Finished difference Result 48 states and 54 transitions. [2018-10-22 15:56:07,423 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 15:56:07,424 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-10-22 15:56:07,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:07,425 INFO L225 Difference]: With dead ends: 48 [2018-10-22 15:56:07,425 INFO L226 Difference]: Without dead ends: 34 [2018-10-22 15:56:07,426 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2018-10-22 15:56:07,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-22 15:56:07,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 28. [2018-10-22 15:56:07,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-22 15:56:07,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2018-10-22 15:56:07,433 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 15 [2018-10-22 15:56:07,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:07,433 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2018-10-22 15:56:07,433 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 15:56:07,433 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2018-10-22 15:56:07,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-22 15:56:07,434 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:07,434 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:07,435 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:07,435 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:07,435 INFO L82 PathProgramCache]: Analyzing trace with hash 894306866, now seen corresponding path program 1 times [2018-10-22 15:56:07,435 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:07,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:07,436 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:07,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:07,437 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:07,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:07,987 WARN L179 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 13 [2018-10-22 15:56:08,193 WARN L179 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 19 [2018-10-22 15:56:08,500 WARN L179 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 17 [2018-10-22 15:56:08,829 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:08,829 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:08,830 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:56:08,832 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 24 with the following transitions: [2018-10-22 15:56:08,836 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [18], [20], [23], [29], [35], [37], [41], [45], [50], [60], [63], [65], [71], [72], [73], [75] [2018-10-22 15:56:08,915 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 15:56:08,915 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 15:56:09,117 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 15:56:10,935 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 15:56:10,937 INFO L272 AbstractInterpreter]: Visited 22 different actions 166 times. Merged at 12 different actions 108 times. Widened at 3 different actions 15 times. Found 1 fixpoints after 1 different actions. Largest state had 38 variables. [2018-10-22 15:56:10,992 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:10,994 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 15:56:10,994 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:10,994 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:56:11,012 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:11,012 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:56:11,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:11,078 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:11,498 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 23 [2018-10-22 15:56:11,519 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:11,522 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 37 [2018-10-22 15:56:11,523 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:11,533 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:11,544 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 15:56:11,545 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:34, output treesize:27 [2018-10-22 15:56:11,795 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 29 [2018-10-22 15:56:11,803 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:11,804 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:11,805 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:11,806 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:11,813 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 43 [2018-10-22 15:56:11,815 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:11,829 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:11,839 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:11,839 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:3 [2018-10-22 15:56:11,926 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:11,927 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:14,345 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 37 [2018-10-22 15:56:14,466 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2018-10-22 15:56:14,469 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:14,471 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:14,472 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:14,487 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 48 [2018-10-22 15:56:14,489 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2018-10-22 15:56:14,491 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:14,492 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:14,494 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:14,504 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 50 [2018-10-22 15:56:14,507 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 2 xjuncts. [2018-10-22 15:56:14,509 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:14,511 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 26 [2018-10-22 15:56:14,513 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:14,534 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:14,538 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:14,539 INFO L202 ElimStorePlain]: Needed 5 recursive calls to eliminate 4 variables, input treesize:45, output treesize:8 [2018-10-22 15:56:14,634 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:14,656 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:14,656 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:56:14,673 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:14,674 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:56:14,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:14,742 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:15,173 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 23 [2018-10-22 15:56:15,198 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:15,200 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 37 [2018-10-22 15:56:15,201 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:15,209 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:15,232 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 15:56:15,232 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:37, output treesize:30 [2018-10-22 15:56:15,259 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 18 [2018-10-22 15:56:15,262 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 7 [2018-10-22 15:56:15,263 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:15,264 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:15,265 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:15,266 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:26, output treesize:3 [2018-10-22 15:56:15,294 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:15,295 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:15,385 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 37 [2018-10-22 15:56:15,496 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:15,510 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 26 [2018-10-22 15:56:15,511 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:15,516 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:15,517 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:15,519 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:15,528 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 43 [2018-10-22 15:56:15,530 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 2 xjuncts. [2018-10-22 15:56:15,536 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:15,537 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:15,537 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:15,563 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 45 [2018-10-22 15:56:15,565 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 2 xjuncts. [2018-10-22 15:56:15,598 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2018-10-22 15:56:15,605 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:15,605 INFO L202 ElimStorePlain]: Needed 5 recursive calls to eliminate 1 variables, input treesize:45, output treesize:10 [2018-10-22 15:56:15,631 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:15,633 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:56:15,633 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12, 12, 12] total 33 [2018-10-22 15:56:15,633 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:56:15,634 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-22 15:56:15,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-22 15:56:15,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=903, Unknown=1, NotChecked=0, Total=1056 [2018-10-22 15:56:15,638 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 20 states. [2018-10-22 15:56:16,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:16,726 INFO L93 Difference]: Finished difference Result 76 states and 91 transitions. [2018-10-22 15:56:16,726 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 15:56:16,726 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 23 [2018-10-22 15:56:16,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:16,730 INFO L225 Difference]: With dead ends: 76 [2018-10-22 15:56:16,731 INFO L226 Difference]: Without dead ends: 74 [2018-10-22 15:56:16,732 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 64 SyntacticMatches, 8 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 616 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=310, Invalid=1495, Unknown=1, NotChecked=0, Total=1806 [2018-10-22 15:56:16,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-22 15:56:16,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 45. [2018-10-22 15:56:16,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-22 15:56:16,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 52 transitions. [2018-10-22 15:56:16,747 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 52 transitions. Word has length 23 [2018-10-22 15:56:16,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:16,748 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 52 transitions. [2018-10-22 15:56:16,748 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-22 15:56:16,748 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 52 transitions. [2018-10-22 15:56:16,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-22 15:56:16,749 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:16,749 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:16,749 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:16,749 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:16,750 INFO L82 PathProgramCache]: Analyzing trace with hash 307500852, now seen corresponding path program 1 times [2018-10-22 15:56:16,750 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:16,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:16,751 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:16,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:16,751 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:16,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:16,920 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:16,921 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 15:56:16,921 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-22 15:56:16,921 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 15:56:16,922 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 15:56:16,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 15:56:16,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-10-22 15:56:16,923 INFO L87 Difference]: Start difference. First operand 45 states and 52 transitions. Second operand 5 states. [2018-10-22 15:56:17,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:17,023 INFO L93 Difference]: Finished difference Result 90 states and 106 transitions. [2018-10-22 15:56:17,023 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 15:56:17,023 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 23 [2018-10-22 15:56:17,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:17,028 INFO L225 Difference]: With dead ends: 90 [2018-10-22 15:56:17,028 INFO L226 Difference]: Without dead ends: 53 [2018-10-22 15:56:17,029 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2018-10-22 15:56:17,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-10-22 15:56:17,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 48. [2018-10-22 15:56:17,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-22 15:56:17,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 55 transitions. [2018-10-22 15:56:17,041 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 55 transitions. Word has length 23 [2018-10-22 15:56:17,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:17,042 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 55 transitions. [2018-10-22 15:56:17,042 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 15:56:17,042 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 55 transitions. [2018-10-22 15:56:17,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-22 15:56:17,043 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:17,043 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:17,044 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:17,044 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:17,044 INFO L82 PathProgramCache]: Analyzing trace with hash 692568650, now seen corresponding path program 1 times [2018-10-22 15:56:17,044 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:17,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:17,045 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:17,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:17,046 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:17,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:17,777 WARN L179 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 31 [2018-10-22 15:56:18,020 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:18,020 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:18,020 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:56:18,021 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 28 with the following transitions: [2018-10-22 15:56:18,021 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [18], [20], [23], [25], [29], [31], [35], [37], [41], [45], [50], [60], [63], [65], [71], [72], [73], [75] [2018-10-22 15:56:18,023 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 15:56:18,023 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 15:56:18,035 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 15:56:22,173 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 15:56:22,174 INFO L272 AbstractInterpreter]: Visited 24 different actions 392 times. Merged at 14 different actions 261 times. Widened at 4 different actions 34 times. Found 69 fixpoints after 5 different actions. Largest state had 39 variables. [2018-10-22 15:56:22,206 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:22,206 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 15:56:22,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:22,206 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:56:22,214 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:22,214 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:56:22,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:22,243 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:22,353 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 36 [2018-10-22 15:56:22,360 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:22,362 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 53 [2018-10-22 15:56:22,363 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:22,371 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:22,384 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:22,385 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:54, output treesize:47 [2018-10-22 15:56:22,468 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:22,469 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 54 [2018-10-22 15:56:22,508 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:22,545 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:22,546 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 61 [2018-10-22 15:56:22,548 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:22,558 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:22,567 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 15:56:22,568 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:63, output treesize:35 [2018-10-22 15:56:22,708 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 20 [2018-10-22 15:56:22,710 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:22,711 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2018-10-22 15:56:22,712 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:22,714 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:22,716 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:22,716 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:28, output treesize:5 [2018-10-22 15:56:22,749 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:22,749 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:24,967 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 62 [2018-10-22 15:56:24,969 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:24,974 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 69 [2018-10-22 15:56:25,081 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 28 [2018-10-22 15:56:25,096 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:25,098 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:25,099 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:25,102 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:25,103 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:25,134 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 50 treesize of output 83 [2018-10-22 15:56:25,137 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 4 xjuncts. [2018-10-22 15:56:25,143 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:25,147 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:25,147 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:25,154 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 47 [2018-10-22 15:56:25,155 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:25,166 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:25,166 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:25,168 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:25,169 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:25,172 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:25,173 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:25,191 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 48 treesize of output 78 [2018-10-22 15:56:25,192 INFO L267 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 2 xjuncts. [2018-10-22 15:56:25,245 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2018-10-22 15:56:25,262 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:25,270 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:25,271 INFO L202 ElimStorePlain]: Needed 6 recursive calls to eliminate 4 variables, input treesize:72, output treesize:13 [2018-10-22 15:56:25,449 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:25,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:25,471 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:56:25,489 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:25,489 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:56:25,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:25,572 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:25,753 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 18 [2018-10-22 15:56:25,757 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:25,758 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 27 [2018-10-22 15:56:25,759 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:25,765 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:25,774 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:25,774 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:33, output treesize:29 [2018-10-22 15:56:25,914 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:25,915 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 39 [2018-10-22 15:56:25,957 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:25,958 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:25,959 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:25,960 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 54 [2018-10-22 15:56:25,961 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:25,970 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:25,984 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 15:56:25,984 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:48, output treesize:30 [2018-10-22 15:56:26,019 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 20 [2018-10-22 15:56:26,022 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:26,023 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 13 [2018-10-22 15:56:26,024 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:26,025 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:26,026 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:26,027 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:28, output treesize:5 [2018-10-22 15:56:26,042 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:26,042 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:26,319 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 76 treesize of output 66 [2018-10-22 15:56:26,346 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,347 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 66 treesize of output 67 [2018-10-22 15:56:26,518 WARN L179 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 36 [2018-10-22 15:56:26,522 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,522 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,523 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,523 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,525 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,525 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,542 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 52 treesize of output 84 [2018-10-22 15:56:26,543 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 2 xjuncts. [2018-10-22 15:56:26,546 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,546 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,547 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,547 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,549 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,550 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,551 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,561 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 51 treesize of output 88 [2018-10-22 15:56:26,564 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 2 xjuncts. [2018-10-22 15:56:26,568 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,569 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,570 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,570 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,571 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,572 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,584 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 84 [2018-10-22 15:56:26,586 INFO L267 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 2 xjuncts. [2018-10-22 15:56:26,588 WARN L307 Elim1Store]: Array PQE input equivalent to true [2018-10-22 15:56:26,588 INFO L267 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:26,594 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,595 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,595 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,595 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,596 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 60 [2018-10-22 15:56:26,597 INFO L267 ElimStorePlain]: Start of recursive call 8: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:26,601 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,605 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,605 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,606 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,607 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,607 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,608 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,617 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 54 treesize of output 85 [2018-10-22 15:56:26,619 INFO L267 ElimStorePlain]: Start of recursive call 9: End of recursive call: and 2 xjuncts. [2018-10-22 15:56:26,622 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,622 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,624 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,624 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,626 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,626 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,627 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:26,636 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 52 treesize of output 85 [2018-10-22 15:56:26,638 INFO L267 ElimStorePlain]: Start of recursive call 10: End of recursive call: and 2 xjuncts. [2018-10-22 15:56:26,669 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:26,672 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:26,679 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:26,679 INFO L202 ElimStorePlain]: Needed 10 recursive calls to eliminate 2 variables, input treesize:84, output treesize:14 [2018-10-22 15:56:26,785 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:26,788 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:56:26,788 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 12, 13, 13] total 39 [2018-10-22 15:56:26,788 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:56:26,789 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-22 15:56:26,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-22 15:56:26,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1299, Unknown=1, NotChecked=0, Total=1482 [2018-10-22 15:56:26,790 INFO L87 Difference]: Start difference. First operand 48 states and 55 transitions. Second operand 20 states. [2018-10-22 15:56:27,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:27,902 INFO L93 Difference]: Finished difference Result 121 states and 145 transitions. [2018-10-22 15:56:27,903 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 15:56:27,903 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2018-10-22 15:56:27,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:27,905 INFO L225 Difference]: With dead ends: 121 [2018-10-22 15:56:27,905 INFO L226 Difference]: Without dead ends: 84 [2018-10-22 15:56:27,907 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 79 SyntacticMatches, 5 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 702 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=357, Invalid=2192, Unknown=1, NotChecked=0, Total=2550 [2018-10-22 15:56:27,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-22 15:56:27,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 48. [2018-10-22 15:56:27,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-22 15:56:27,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2018-10-22 15:56:27,917 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 27 [2018-10-22 15:56:27,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:27,917 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2018-10-22 15:56:27,917 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-22 15:56:27,917 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2018-10-22 15:56:27,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-22 15:56:27,918 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:27,918 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:27,919 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:27,919 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:27,919 INFO L82 PathProgramCache]: Analyzing trace with hash -1150796076, now seen corresponding path program 1 times [2018-10-22 15:56:27,919 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:27,920 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:27,920 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:27,920 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:27,921 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:27,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:28,335 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 11 [2018-10-22 15:56:28,467 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:28,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:28,467 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:56:28,468 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 33 with the following transitions: [2018-10-22 15:56:28,468 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [18], [20], [23], [29], [35], [37], [41], [45], [50], [52], [54], [60], [63], [65], [68], [70], [71], [72], [73], [75], [76] [2018-10-22 15:56:28,470 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 15:56:28,471 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 15:56:28,476 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 15:56:29,751 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 15:56:29,751 INFO L272 AbstractInterpreter]: Visited 27 different actions 370 times. Merged at 15 different actions 196 times. Widened at 4 different actions 28 times. Found 11 fixpoints after 2 different actions. Largest state had 39 variables. [2018-10-22 15:56:29,788 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:29,788 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 15:56:29,788 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:29,789 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-10-22 15:56:29,803 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:29,803 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:56:29,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:29,841 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:30,292 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:30,292 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:33,251 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:33,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:33,280 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:56:33,307 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:33,307 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:56:33,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:33,384 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:33,589 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:33,589 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:33,954 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:33,958 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:56:33,959 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7, 7, 7] total 12 [2018-10-22 15:56:33,959 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:56:33,959 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 15:56:33,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 15:56:33,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=99, Unknown=1, NotChecked=0, Total=132 [2018-10-22 15:56:33,960 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 9 states. [2018-10-22 15:56:34,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:34,523 INFO L93 Difference]: Finished difference Result 69 states and 76 transitions. [2018-10-22 15:56:34,523 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 15:56:34,523 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 32 [2018-10-22 15:56:34,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:34,524 INFO L225 Difference]: With dead ends: 69 [2018-10-22 15:56:34,524 INFO L226 Difference]: Without dead ends: 46 [2018-10-22 15:56:34,525 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 116 SyntacticMatches, 10 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=54, Invalid=155, Unknown=1, NotChecked=0, Total=210 [2018-10-22 15:56:34,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-22 15:56:34,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 40. [2018-10-22 15:56:34,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-22 15:56:34,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2018-10-22 15:56:34,532 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 32 [2018-10-22 15:56:34,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:34,532 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2018-10-22 15:56:34,532 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 15:56:34,532 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2018-10-22 15:56:34,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-22 15:56:34,533 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:34,533 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:34,534 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:34,534 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:34,534 INFO L82 PathProgramCache]: Analyzing trace with hash -1621042525, now seen corresponding path program 2 times [2018-10-22 15:56:34,534 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:34,535 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:34,535 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:34,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:34,536 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:34,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:35,128 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:35,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:35,129 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:56:35,129 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:56:35,129 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:56:35,130 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:35,130 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:56:35,146 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:56:35,146 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:56:35,202 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:56:35,202 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:35,206 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:35,488 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 18 [2018-10-22 15:56:35,527 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:35,553 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 27 [2018-10-22 15:56:35,554 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:35,598 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:35,609 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:35,610 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:26 [2018-10-22 15:56:35,688 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 21 [2018-10-22 15:56:35,691 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:35,692 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:35,694 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:35,699 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 46 [2018-10-22 15:56:35,701 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:35,710 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:35,720 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:35,720 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:36, output treesize:20 [2018-10-22 15:56:35,747 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 18 [2018-10-22 15:56:35,750 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 10 [2018-10-22 15:56:35,750 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:35,752 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:35,754 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:35,754 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:26, output treesize:3 [2018-10-22 15:56:35,774 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:35,774 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:45,830 WARN L179 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 20 [2018-10-22 15:56:50,408 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 43 [2018-10-22 15:56:50,435 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:50,459 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 50 [2018-10-22 15:56:50,756 WARN L179 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 34 [2018-10-22 15:56:50,762 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:50,762 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:50,768 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:50,769 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:50,770 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:50,802 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 46 treesize of output 83 [2018-10-22 15:56:50,806 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 4 xjuncts. [2018-10-22 15:56:50,809 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:50,811 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:50,815 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:50,818 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:50,818 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:50,852 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 42 treesize of output 81 [2018-10-22 15:56:50,855 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 4 xjuncts. [2018-10-22 15:56:50,942 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:50,960 INFO L303 Elim1Store]: Index analysis took 104 ms [2018-10-22 15:56:50,973 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 39 treesize of output 59 [2018-10-22 15:56:50,975 INFO L267 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 4 xjuncts. [2018-10-22 15:56:50,978 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:50,978 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:50,982 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:50,982 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:50,983 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:51,007 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 48 treesize of output 83 [2018-10-22 15:56:51,011 INFO L267 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 4 xjuncts. [2018-10-22 15:56:51,082 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:51,152 INFO L303 Elim1Store]: Index analysis took 140 ms [2018-10-22 15:56:51,308 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 34 treesize of output 52 [2018-10-22 15:56:51,310 INFO L267 ElimStorePlain]: Start of recursive call 8: End of recursive call: and 4 xjuncts. [2018-10-22 15:56:51,363 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:51,378 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:51,431 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:51,445 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:51,459 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:51,543 INFO L303 Elim1Store]: Index analysis took 205 ms [2018-10-22 15:56:51,561 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 41 treesize of output 82 [2018-10-22 15:56:51,565 INFO L267 ElimStorePlain]: Start of recursive call 9: End of recursive call: and 4 xjuncts. [2018-10-22 15:56:51,570 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:51,570 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:51,574 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:51,574 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:51,575 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:56:51,598 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 40 treesize of output 81 [2018-10-22 15:56:51,600 INFO L267 ElimStorePlain]: Start of recursive call 10: End of recursive call: and 4 xjuncts. [2018-10-22 15:56:51,703 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 4 xjuncts. [2018-10-22 15:56:51,726 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 4 xjuncts. [2018-10-22 15:56:51,758 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 4 xjuncts. [2018-10-22 15:56:51,759 INFO L202 ElimStorePlain]: Needed 10 recursive calls to eliminate 4 variables, input treesize:59, output treesize:53 [2018-10-22 15:56:51,915 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:51,938 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:51,938 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:56:51,954 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:56:51,955 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:56:52,069 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:56:52,069 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:52,077 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:52,225 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 35 [2018-10-22 15:56:52,263 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:52,273 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 37 [2018-10-22 15:56:52,274 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:52,279 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:52,286 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:52,286 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:50, output treesize:27 [2018-10-22 15:56:52,340 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 32 [2018-10-22 15:56:52,350 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:52,351 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:52,352 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:56:52,359 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 58 [2018-10-22 15:56:52,360 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:52,367 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:52,375 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:52,375 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:49, output treesize:19 [2018-10-22 15:56:52,388 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 18 [2018-10-22 15:56:52,391 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 7 [2018-10-22 15:56:52,391 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:56:52,393 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:52,394 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:56:52,395 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:26, output treesize:3 [2018-10-22 15:56:52,442 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:56:52,443 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:57:10,762 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 15:57:10,764 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 4 imperfect interpolant sequences. [2018-10-22 15:57:10,764 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [11] imperfect sequences [15, 15, 15, 14] total 39 [2018-10-22 15:57:10,764 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 15:57:10,764 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 15:57:10,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 15:57:10,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=1246, Unknown=15, NotChecked=0, Total=1482 [2018-10-22 15:57:10,766 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand 11 states. [2018-10-22 15:57:11,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:57:11,281 INFO L93 Difference]: Finished difference Result 69 states and 77 transitions. [2018-10-22 15:57:11,282 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 15:57:11,282 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 31 [2018-10-22 15:57:11,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:57:11,283 INFO L225 Difference]: With dead ends: 69 [2018-10-22 15:57:11,283 INFO L226 Difference]: Without dead ends: 67 [2018-10-22 15:57:11,284 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 88 SyntacticMatches, 12 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 846 ImplicationChecksByTransitivity, 34.3s TimeCoverageRelationStatistics Valid=304, Invalid=1751, Unknown=15, NotChecked=0, Total=2070 [2018-10-22 15:57:11,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-22 15:57:11,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 60. [2018-10-22 15:57:11,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-22 15:57:11,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 67 transitions. [2018-10-22 15:57:11,292 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 67 transitions. Word has length 31 [2018-10-22 15:57:11,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:57:11,293 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 67 transitions. [2018-10-22 15:57:11,293 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 15:57:11,293 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 67 transitions. [2018-10-22 15:57:11,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-22 15:57:11,294 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:57:11,294 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:57:11,294 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:57:11,295 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:57:11,295 INFO L82 PathProgramCache]: Analyzing trace with hash -693836487, now seen corresponding path program 1 times [2018-10-22 15:57:11,295 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:57:11,296 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:57:11,296 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:57:11,296 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:57:11,296 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:57:11,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:57:11,805 WARN L179 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 11 DAG size of output: 9 [2018-10-22 15:57:12,319 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:57:12,320 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:57:12,320 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:57:12,320 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 36 with the following transitions: [2018-10-22 15:57:12,320 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [18], [20], [23], [29], [31], [35], [37], [41], [45], [50], [60], [63], [65], [71], [72], [73], [75] [2018-10-22 15:57:12,322 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 15:57:12,323 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 15:57:12,328 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 15:57:14,380 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 15:57:14,381 INFO L272 AbstractInterpreter]: Visited 23 different actions 255 times. Merged at 13 different actions 177 times. Widened at 4 different actions 31 times. Found 17 fixpoints after 4 different actions. Largest state had 39 variables. [2018-10-22 15:57:14,418 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:57:14,418 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 15:57:14,419 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:57:14,419 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-10-22 15:57:14,433 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:57:14,434 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:57:14,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:57:14,466 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:57:14,962 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 23 [2018-10-22 15:57:14,965 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:14,967 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 37 [2018-10-22 15:57:14,967 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:14,973 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:14,982 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 15:57:14,983 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:34, output treesize:27 [2018-10-22 15:57:15,050 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 29 [2018-10-22 15:57:15,056 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:15,057 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:15,058 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:15,058 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:15,064 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 43 [2018-10-22 15:57:15,065 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:15,078 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:15,084 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:15,085 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:3 [2018-10-22 15:57:15,100 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:57:15,100 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:57:17,389 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 37 [2018-10-22 15:57:17,444 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:17,446 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:17,446 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:17,454 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 48 [2018-10-22 15:57:17,455 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2018-10-22 15:57:17,457 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:17,458 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 26 [2018-10-22 15:57:17,459 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:17,460 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:17,461 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:17,462 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:17,471 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 50 [2018-10-22 15:57:17,472 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 2 xjuncts. [2018-10-22 15:57:17,487 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:17,492 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:17,492 INFO L202 ElimStorePlain]: Needed 5 recursive calls to eliminate 4 variables, input treesize:45, output treesize:8 [2018-10-22 15:57:17,572 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:57:17,595 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:57:17,595 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:57:17,618 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:57:17,618 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:57:17,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:57:17,733 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:57:17,767 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 8 [2018-10-22 15:57:17,770 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2018-10-22 15:57:17,771 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:17,780 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:17,788 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:17,788 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:18, output treesize:7 [2018-10-22 15:57:17,807 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 8 [2018-10-22 15:57:17,815 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2018-10-22 15:57:17,816 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:17,818 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:17,824 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:17,825 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:28, output treesize:9 [2018-10-22 15:57:18,002 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 19 [2018-10-22 15:57:18,006 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:18,007 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 29 [2018-10-22 15:57:18,008 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:18,013 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:18,023 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 15:57:18,023 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:34, output treesize:27 [2018-10-22 15:57:18,081 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 18 [2018-10-22 15:57:18,107 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 7 [2018-10-22 15:57:18,108 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:18,109 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:18,110 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:18,110 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:26, output treesize:3 [2018-10-22 15:57:18,125 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:57:18,125 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:57:20,731 WARN L179 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 27 [2018-10-22 15:57:20,737 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 60 treesize of output 54 [2018-10-22 15:57:20,739 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 51 [2018-10-22 15:57:20,768 WARN L307 Elim1Store]: Array PQE input equivalent to true [2018-10-22 15:57:20,769 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:20,774 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:20,792 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 61 [2018-10-22 15:57:20,933 WARN L179 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 56 [2018-10-22 15:57:20,937 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:20,948 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 61 [2018-10-22 15:57:20,949 INFO L267 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 2 xjuncts. [2018-10-22 15:57:20,952 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:20,954 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:20,956 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:20,981 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 55 treesize of output 89 [2018-10-22 15:57:20,985 INFO L267 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 6 xjuncts. [2018-10-22 15:57:20,987 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:20,989 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:20,992 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:21,016 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 51 treesize of output 89 [2018-10-22 15:57:21,020 INFO L267 ElimStorePlain]: Start of recursive call 8: End of recursive call: and 6 xjuncts. [2018-10-22 15:57:21,182 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:21,186 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:21,188 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:21,194 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:21,246 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 44 treesize of output 115 [2018-10-22 15:57:21,246 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 7 [2018-10-22 15:57:21,278 INFO L267 ElimStorePlain]: Start of recursive call 9: End of recursive call: and 58 xjuncts. [2018-10-22 15:57:21,287 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:21,291 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:21,338 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 38 treesize of output 74 [2018-10-22 15:57:21,342 INFO L267 ElimStorePlain]: Start of recursive call 10: End of recursive call: and 16 xjuncts. [2018-10-22 15:57:21,978 INFO L267 ElimStorePlain]: Start of recursive call 5: 2 dim-1 vars, End of recursive call: and 14 xjuncts. [2018-10-22 15:57:22,190 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 13 xjuncts. [2018-10-22 15:57:22,358 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 13 xjuncts. [2018-10-22 15:57:22,540 INFO L267 ElimStorePlain]: Start of recursive call 1: 5 dim-0 vars, 1 dim-2 vars, End of recursive call: and 2 xjuncts. [2018-10-22 15:57:22,540 INFO L202 ElimStorePlain]: Needed 10 recursive calls to eliminate 6 variables, input treesize:68, output treesize:18 [2018-10-22 15:57:22,603 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:57:22,605 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:57:22,605 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14, 14, 14] total 41 [2018-10-22 15:57:22,605 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:57:22,606 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-22 15:57:22,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-22 15:57:22,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=1446, Unknown=0, NotChecked=0, Total=1640 [2018-10-22 15:57:22,608 INFO L87 Difference]: Start difference. First operand 60 states and 67 transitions. Second operand 24 states. [2018-10-22 15:57:23,044 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 28 [2018-10-22 15:57:24,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:57:24,703 INFO L93 Difference]: Finished difference Result 182 states and 222 transitions. [2018-10-22 15:57:24,704 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-22 15:57:24,704 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 35 [2018-10-22 15:57:24,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:57:24,705 INFO L225 Difference]: With dead ends: 182 [2018-10-22 15:57:24,706 INFO L226 Difference]: Without dead ends: 162 [2018-10-22 15:57:24,707 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 103 SyntacticMatches, 15 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1456 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=840, Invalid=4562, Unknown=0, NotChecked=0, Total=5402 [2018-10-22 15:57:24,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2018-10-22 15:57:24,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 93. [2018-10-22 15:57:24,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-10-22 15:57:24,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 112 transitions. [2018-10-22 15:57:24,724 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 112 transitions. Word has length 35 [2018-10-22 15:57:24,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:57:24,724 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 112 transitions. [2018-10-22 15:57:24,724 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-22 15:57:24,724 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 112 transitions. [2018-10-22 15:57:24,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-22 15:57:24,726 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:57:24,726 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:57:24,726 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:57:24,726 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:57:24,726 INFO L82 PathProgramCache]: Analyzing trace with hash -1601373509, now seen corresponding path program 2 times [2018-10-22 15:57:24,726 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:57:24,727 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:57:24,727 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:57:24,727 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:57:24,727 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:57:24,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:57:24,950 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-22 15:57:25,426 WARN L179 SmtUtils]: Spent 444.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2018-10-22 15:57:25,625 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2018-10-22 15:57:25,905 WARN L179 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 27 [2018-10-22 15:57:26,258 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:57:26,259 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:57:26,259 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:57:26,259 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:57:26,259 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:57:26,259 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:57:26,259 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:57:26,267 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:57:26,267 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:57:26,297 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:57:26,297 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:57:26,305 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:57:26,470 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 34 [2018-10-22 15:57:26,474 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:26,476 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 50 [2018-10-22 15:57:26,477 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:26,496 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:26,518 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 15:57:26,519 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:55, output treesize:48 [2018-10-22 15:57:26,967 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 36 [2018-10-22 15:57:26,970 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:26,972 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:26,974 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:26,976 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:26,986 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 83 [2018-10-22 15:57:26,988 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2018-10-22 15:57:27,023 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2018-10-22 15:57:27,060 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: 4 dim-0 vars, and 2 xjuncts. [2018-10-22 15:57:27,061 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 5 variables, input treesize:70, output treesize:104 [2018-10-22 15:57:27,328 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 74 treesize of output 63 [2018-10-22 15:57:27,332 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:27,334 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:27,335 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:27,336 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:27,338 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:27,339 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:27,341 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:27,343 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:27,351 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 129 [2018-10-22 15:57:27,352 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:27,392 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:27,666 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 41 [2018-10-22 15:57:27,669 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:27,671 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:27,672 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:27,674 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:27,678 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 81 [2018-10-22 15:57:27,679 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:27,698 INFO L267 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:27,738 INFO L267 ElimStorePlain]: Start of recursive call 1: 8 dim-0 vars, 2 dim-2 vars, End of recursive call: 4 dim-0 vars, and 2 xjuncts. [2018-10-22 15:57:27,738 INFO L202 ElimStorePlain]: Needed 5 recursive calls to eliminate 10 variables, input treesize:123, output treesize:91 [2018-10-22 15:57:27,896 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 32 [2018-10-22 15:57:27,900 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:27,901 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:27,902 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:27,903 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:27,904 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 38 [2018-10-22 15:57:27,905 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:27,912 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:27,940 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 63 treesize of output 51 [2018-10-22 15:57:27,985 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:27,996 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:27,997 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:27,998 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:27,999 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:28,000 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:28,000 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:28,025 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:28,028 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:28,034 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 67 [2018-10-22 15:57:28,036 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:28,053 INFO L267 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:28,071 INFO L267 ElimStorePlain]: Start of recursive call 1: 6 dim-0 vars, 2 dim-2 vars, End of recursive call: and 2 xjuncts. [2018-10-22 15:57:28,073 INFO L202 ElimStorePlain]: Needed 5 recursive calls to eliminate 8 variables, input treesize:104, output treesize:9 [2018-10-22 15:57:28,125 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:57:28,125 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:57:49,578 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 68 treesize of output 60 [2018-10-22 15:57:49,580 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:49,582 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 60 treesize of output 67 [2018-10-22 15:57:49,585 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:49,590 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:49,591 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:49,616 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 55 treesize of output 90 [2018-10-22 15:57:49,937 WARN L179 SmtUtils]: Spent 315.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 85 [2018-10-22 15:57:49,942 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:49,943 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:49,946 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:49,953 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 49 treesize of output 59 [2018-10-22 15:57:49,954 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 2 xjuncts. [2018-10-22 15:57:49,957 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:49,958 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:49,958 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:49,959 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:49,960 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:49,961 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:49,967 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:49,975 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 9 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 81 [2018-10-22 15:57:49,976 INFO L267 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 2 xjuncts. [2018-10-22 15:57:50,006 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,020 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,033 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 44 treesize of output 69 [2018-10-22 15:57:50,034 INFO L267 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 3 xjuncts. [2018-10-22 15:57:50,041 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,041 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,042 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,043 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,045 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,046 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,052 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,060 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 51 treesize of output 82 [2018-10-22 15:57:50,061 INFO L267 ElimStorePlain]: Start of recursive call 8: End of recursive call: and 2 xjuncts. [2018-10-22 15:57:50,065 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,065 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,083 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,084 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,086 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,086 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,091 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,099 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 58 treesize of output 83 [2018-10-22 15:57:50,100 INFO L267 ElimStorePlain]: Start of recursive call 9: End of recursive call: and 2 xjuncts. [2018-10-22 15:57:50,118 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,119 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,120 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,121 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,123 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,124 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,130 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,138 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 52 treesize of output 81 [2018-10-22 15:57:50,140 INFO L267 ElimStorePlain]: Start of recursive call 10: End of recursive call: and 2 xjuncts. [2018-10-22 15:57:50,170 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,184 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,193 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,208 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,222 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,224 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,229 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,236 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 56 treesize of output 83 [2018-10-22 15:57:50,237 INFO L267 ElimStorePlain]: Start of recursive call 11: End of recursive call: and 2 xjuncts. [2018-10-22 15:57:50,604 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,605 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,605 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,610 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,611 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,633 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 51 treesize of output 92 [2018-10-22 15:57:50,637 INFO L267 ElimStorePlain]: Start of recursive call 12: End of recursive call: and 5 xjuncts. [2018-10-22 15:57:50,662 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,676 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,709 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,747 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,778 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,791 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,804 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,818 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,965 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,974 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:50,991 INFO L303 Elim1Store]: Index analysis took 352 ms [2018-10-22 15:57:51,021 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 57 treesize of output 120 [2018-10-22 15:57:51,026 INFO L267 ElimStorePlain]: Start of recursive call 13: End of recursive call: and 5 xjuncts. [2018-10-22 15:57:51,028 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:51,031 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:51,032 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:51,033 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:51,038 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:51,038 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:51,054 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 51 treesize of output 85 [2018-10-22 15:57:51,057 INFO L267 ElimStorePlain]: Start of recursive call 14: End of recursive call: and 4 xjuncts. [2018-10-22 15:57:51,405 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:51,406 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:51,407 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:51,409 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:51,410 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:51,410 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:51,417 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:51,426 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 9 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 88 [2018-10-22 15:57:51,428 INFO L267 ElimStorePlain]: Start of recursive call 15: End of recursive call: and 2 xjuncts. [2018-10-22 15:57:51,432 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:51,432 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:51,436 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:51,443 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 49 treesize of output 64 [2018-10-22 15:57:51,444 INFO L267 ElimStorePlain]: Start of recursive call 16: End of recursive call: and 2 xjuncts. [2018-10-22 15:57:51,447 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:51,447 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:51,448 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:51,451 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:51,452 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 51 [2018-10-22 15:57:51,453 INFO L267 ElimStorePlain]: Start of recursive call 17: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:51,598 INFO L267 ElimStorePlain]: Start of recursive call 4: 3 dim-1 vars, End of recursive call: and 7 xjuncts. [2018-10-22 15:57:51,671 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 6 xjuncts. [2018-10-22 15:57:51,733 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 6 xjuncts. [2018-10-22 15:57:51,815 INFO L267 ElimStorePlain]: Start of recursive call 1: 6 dim-0 vars, 1 dim-2 vars, End of recursive call: and 5 xjuncts. [2018-10-22 15:57:51,816 INFO L202 ElimStorePlain]: Needed 17 recursive calls to eliminate 7 variables, input treesize:89, output treesize:82 [2018-10-22 15:57:53,983 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:57:54,003 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:57:54,003 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:57:54,019 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:57:54,019 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:57:54,142 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:57:54,143 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:57:54,149 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:57:54,384 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 30 [2018-10-22 15:57:54,418 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:54,419 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 46 [2018-10-22 15:57:54,419 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:54,512 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:54,535 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:54,535 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:48, output treesize:44 [2018-10-22 15:57:54,749 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:54,750 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 51 [2018-10-22 15:57:54,753 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:54,754 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:54,754 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:57:54,755 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 70 [2018-10-22 15:57:54,756 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:54,765 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:54,779 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:54,779 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:63, output treesize:30 [2018-10-22 15:57:54,870 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 22 [2018-10-22 15:57:54,875 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:54,877 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:54,878 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:54,880 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:54,883 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 61 [2018-10-22 15:57:54,884 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:54,896 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:54,909 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 15:57:54,909 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:47, output treesize:28 [2018-10-22 15:57:54,943 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 20 [2018-10-22 15:57:54,945 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:57:54,945 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 13 [2018-10-22 15:57:54,946 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:57:54,947 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:54,949 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:57:54,949 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:28, output treesize:5 [2018-10-22 15:57:54,970 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:57:54,971 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:58:50,394 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 72 [2018-10-22 15:58:50,419 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,420 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 72 treesize of output 73 [2018-10-22 15:58:50,445 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,452 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,477 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 61 treesize of output 102 [2018-10-22 15:58:50,731 WARN L179 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 109 DAG size of output: 82 [2018-10-22 15:58:50,736 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,737 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,737 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,738 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,739 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,739 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,742 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,743 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,744 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,744 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,756 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,777 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 63 treesize of output 128 [2018-10-22 15:58:50,778 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 2 xjuncts. [2018-10-22 15:58:50,781 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,781 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,782 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,782 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,783 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,783 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,791 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,792 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 91 [2018-10-22 15:58:50,793 INFO L267 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2018-10-22 15:58:50,797 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,798 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,799 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,799 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,801 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,801 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,804 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,805 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,806 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,807 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,820 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,827 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 126 [2018-10-22 15:58:50,829 INFO L267 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 2 xjuncts. [2018-10-22 15:58:50,855 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,869 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,871 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,871 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,872 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,873 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,874 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,875 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,876 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,877 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,889 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,897 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 126 [2018-10-22 15:58:50,899 INFO L267 ElimStorePlain]: Start of recursive call 8: End of recursive call: and 2 xjuncts. [2018-10-22 15:58:50,903 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,904 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,904 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,905 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,905 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,906 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,909 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,910 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,910 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,911 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,921 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,929 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 11 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 128 [2018-10-22 15:58:50,931 INFO L267 ElimStorePlain]: Start of recursive call 9: End of recursive call: and 2 xjuncts. [2018-10-22 15:58:50,934 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,935 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,935 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,936 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,936 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,937 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,940 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,941 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,941 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,942 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,953 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,960 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 11 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 58 treesize of output 127 [2018-10-22 15:58:50,962 INFO L267 ElimStorePlain]: Start of recursive call 10: End of recursive call: and 2 xjuncts. [2018-10-22 15:58:50,965 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,966 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,968 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,969 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,969 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,976 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:50,982 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 51 treesize of output 89 [2018-10-22 15:58:50,983 INFO L267 ElimStorePlain]: Start of recursive call 11: End of recursive call: and 2 xjuncts. [2018-10-22 15:58:51,276 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,277 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,277 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,278 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,280 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,281 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,288 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,295 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 79 [2018-10-22 15:58:51,296 INFO L267 ElimStorePlain]: Start of recursive call 12: End of recursive call: and 2 xjuncts. [2018-10-22 15:58:51,300 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,302 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,306 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,313 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 52 [2018-10-22 15:58:51,314 INFO L267 ElimStorePlain]: Start of recursive call 13: End of recursive call: and 2 xjuncts. [2018-10-22 15:58:51,317 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,317 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,317 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,321 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,322 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 47 [2018-10-22 15:58:51,323 INFO L267 ElimStorePlain]: Start of recursive call 14: End of recursive call: and 1 xjuncts. [2018-10-22 15:58:51,326 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,327 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,327 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,328 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,329 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,330 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,337 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,345 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 81 [2018-10-22 15:58:51,346 INFO L267 ElimStorePlain]: Start of recursive call 15: End of recursive call: and 2 xjuncts. [2018-10-22 15:58:51,461 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,466 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,480 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 35 treesize of output 61 [2018-10-22 15:58:51,482 INFO L267 ElimStorePlain]: Start of recursive call 16: End of recursive call: and 3 xjuncts. [2018-10-22 15:58:51,503 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,504 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,505 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,510 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,510 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,519 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,533 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 41 treesize of output 87 [2018-10-22 15:58:51,535 INFO L267 ElimStorePlain]: Start of recursive call 17: End of recursive call: and 3 xjuncts. [2018-10-22 15:58:51,539 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,540 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,544 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:58:51,551 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 54 [2018-10-22 15:58:51,552 INFO L267 ElimStorePlain]: Start of recursive call 18: End of recursive call: and 2 xjuncts. [2018-10-22 15:58:51,641 INFO L267 ElimStorePlain]: Start of recursive call 4: 3 dim-1 vars, End of recursive call: and 5 xjuncts. [2018-10-22 15:58:51,674 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 4 xjuncts. [2018-10-22 15:58:51,699 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 4 xjuncts. [2018-10-22 15:58:51,735 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 4 xjuncts. [2018-10-22 15:58:51,736 INFO L202 ElimStorePlain]: Needed 18 recursive calls to eliminate 5 variables, input treesize:101, output treesize:43 [2018-10-22 15:59:05,842 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 12 refuted. 6 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:59:05,844 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:59:05,844 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17, 16, 16] total 59 [2018-10-22 15:59:05,844 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:59:05,845 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-22 15:59:05,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-22 15:59:05,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=2997, Unknown=43, NotChecked=0, Total=3422 [2018-10-22 15:59:05,847 INFO L87 Difference]: Start difference. First operand 93 states and 112 transitions. Second operand 31 states. [2018-10-22 15:59:09,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:59:09,264 INFO L93 Difference]: Finished difference Result 142 states and 170 transitions. [2018-10-22 15:59:09,265 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 15:59:09,265 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 35 [2018-10-22 15:59:09,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:59:09,267 INFO L225 Difference]: With dead ends: 142 [2018-10-22 15:59:09,267 INFO L226 Difference]: Without dead ends: 121 [2018-10-22 15:59:09,270 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 92 SyntacticMatches, 8 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1692 ImplicationChecksByTransitivity, 96.7s TimeCoverageRelationStatistics Valid=561, Invalid=3952, Unknown=43, NotChecked=0, Total=4556 [2018-10-22 15:59:09,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-10-22 15:59:09,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 96. [2018-10-22 15:59:09,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-10-22 15:59:09,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 115 transitions. [2018-10-22 15:59:09,280 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 115 transitions. Word has length 35 [2018-10-22 15:59:09,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:59:09,281 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 115 transitions. [2018-10-22 15:59:09,281 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-22 15:59:09,281 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 115 transitions. [2018-10-22 15:59:09,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-22 15:59:09,282 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:59:09,283 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:59:09,283 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:59:09,283 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:59:09,283 INFO L82 PathProgramCache]: Analyzing trace with hash 99245443, now seen corresponding path program 2 times [2018-10-22 15:59:09,283 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:59:09,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:59:09,284 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:59:09,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:59:09,284 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:59:09,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:59:09,820 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:59:09,820 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:59:09,820 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:59:09,821 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:59:09,821 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:59:09,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:59:09,821 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:59:09,828 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:59:09,828 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:59:09,861 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:59:09,861 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:59:09,864 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:59:10,132 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 18 [2018-10-22 15:59:10,134 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:10,136 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 27 [2018-10-22 15:59:10,136 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:10,142 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:10,149 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:10,149 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:26, output treesize:19 [2018-10-22 15:59:10,355 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 18 [2018-10-22 15:59:10,364 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 10 [2018-10-22 15:59:10,364 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:10,365 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:10,366 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:10,367 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:26, output treesize:3 [2018-10-22 15:59:10,415 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:59:10,415 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:59:10,591 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 41 [2018-10-22 15:59:10,642 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:10,642 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:10,646 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:10,654 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 53 [2018-10-22 15:59:10,655 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2018-10-22 15:59:10,657 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:10,659 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2018-10-22 15:59:10,659 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:10,682 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:10,682 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:10,685 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:10,691 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 51 [2018-10-22 15:59:10,692 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 2 xjuncts. [2018-10-22 15:59:10,708 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:10,710 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:10,711 INFO L202 ElimStorePlain]: Needed 5 recursive calls to eliminate 2 variables, input treesize:47, output treesize:11 [2018-10-22 15:59:10,726 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:59:10,747 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:59:10,747 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:59:10,764 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:59:10,764 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:59:10,882 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:59:10,882 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:59:10,889 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:59:10,948 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 18 [2018-10-22 15:59:10,950 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 11 [2018-10-22 15:59:10,950 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:10,951 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:10,954 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:10,955 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:30, output treesize:7 [2018-10-22 15:59:11,294 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 26 [2018-10-22 15:59:11,296 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:11,298 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 27 [2018-10-22 15:59:11,298 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:11,302 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:11,306 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:11,307 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:38, output treesize:19 [2018-10-22 15:59:11,368 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 18 [2018-10-22 15:59:11,370 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 7 [2018-10-22 15:59:11,370 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:11,371 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:11,373 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:11,373 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:26, output treesize:3 [2018-10-22 15:59:11,380 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:59:11,380 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:59:11,688 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 149 treesize of output 127 [2018-10-22 15:59:11,696 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:11,697 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:11,698 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:11,700 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 102 [2018-10-22 15:59:11,750 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:11,752 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:11,753 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:11,756 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:11,762 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:11,779 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 32 treesize of output 89 [2018-10-22 15:59:11,781 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 4 xjuncts. [2018-10-22 15:59:11,799 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:11,801 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:11,803 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:11,803 INFO L202 ElimStorePlain]: Needed 4 recursive calls to eliminate 2 variables, input treesize:149, output treesize:11 [2018-10-22 15:59:11,816 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:59:11,818 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:59:11,818 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16, 13, 15, 15] total 45 [2018-10-22 15:59:11,818 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:59:11,818 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-22 15:59:11,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-22 15:59:11,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=1765, Unknown=0, NotChecked=0, Total=1980 [2018-10-22 15:59:11,820 INFO L87 Difference]: Start difference. First operand 96 states and 115 transitions. Second operand 32 states. [2018-10-22 15:59:27,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:59:27,364 INFO L93 Difference]: Finished difference Result 146 states and 172 transitions. [2018-10-22 15:59:27,364 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-22 15:59:27,364 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 40 [2018-10-22 15:59:27,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:59:27,366 INFO L225 Difference]: With dead ends: 146 [2018-10-22 15:59:27,366 INFO L226 Difference]: Without dead ends: 144 [2018-10-22 15:59:27,368 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 123 SyntacticMatches, 13 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1247 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=498, Invalid=3284, Unknown=0, NotChecked=0, Total=3782 [2018-10-22 15:59:27,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2018-10-22 15:59:27,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 106. [2018-10-22 15:59:27,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-10-22 15:59:27,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 125 transitions. [2018-10-22 15:59:27,379 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 125 transitions. Word has length 40 [2018-10-22 15:59:27,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:59:27,379 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 125 transitions. [2018-10-22 15:59:27,379 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-22 15:59:27,379 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 125 transitions. [2018-10-22 15:59:27,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-22 15:59:27,381 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:59:27,381 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:59:27,382 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:59:27,382 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:59:27,382 INFO L82 PathProgramCache]: Analyzing trace with hash 1042006481, now seen corresponding path program 3 times [2018-10-22 15:59:27,382 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:59:27,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:59:27,383 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:59:27,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:59:27,383 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:59:27,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:59:27,608 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-22 15:59:27,935 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:59:27,936 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:59:27,936 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:59:27,936 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:59:27,936 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:59:27,936 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:59:27,936 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:59:27,945 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:59:27,945 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 15:59:27,979 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-22 15:59:27,980 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:59:27,982 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:59:28,090 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 36 [2018-10-22 15:59:28,092 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:28,093 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 53 [2018-10-22 15:59:28,094 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:28,103 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:28,115 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:28,115 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:51, output treesize:44 [2018-10-22 15:59:28,235 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:28,236 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 54 [2018-10-22 15:59:28,241 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:28,244 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:28,245 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 61 [2018-10-22 15:59:28,246 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:28,255 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:28,267 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 15:59:28,268 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:63, output treesize:35 [2018-10-22 15:59:28,422 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 20 [2018-10-22 15:59:28,454 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:28,455 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2018-10-22 15:59:28,456 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:28,481 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:28,506 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:28,506 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:28, output treesize:5 [2018-10-22 15:59:28,602 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 21 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-10-22 15:59:28,602 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:59:30,747 WARN L179 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 20 [2018-10-22 15:59:30,891 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 62 [2018-10-22 15:59:30,894 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:30,896 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 69 [2018-10-22 15:59:30,952 WARN L307 Elim1Store]: Array PQE input equivalent to true [2018-10-22 15:59:30,953 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:30,955 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:30,955 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:30,955 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:30,956 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:30,958 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:30,958 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:30,972 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 48 treesize of output 78 [2018-10-22 15:59:30,973 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 2 xjuncts. [2018-10-22 15:59:30,976 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:30,976 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:30,977 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:30,977 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:30,979 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:30,980 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:30,993 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 78 [2018-10-22 15:59:30,995 INFO L267 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 2 xjuncts. [2018-10-22 15:59:31,021 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:31,026 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:31,034 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:31,035 INFO L202 ElimStorePlain]: Needed 6 recursive calls to eliminate 3 variables, input treesize:75, output treesize:16 [2018-10-22 15:59:33,076 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-10-22 15:59:33,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:59:33,097 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:59:33,112 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:59:33,112 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 15:59:33,284 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-22 15:59:33,285 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:59:33,290 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:59:33,360 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 31 [2018-10-22 15:59:33,363 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:33,364 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 48 [2018-10-22 15:59:33,364 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:33,370 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:33,380 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:33,380 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:46, output treesize:42 [2018-10-22 15:59:33,562 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:33,563 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 50 treesize of output 52 [2018-10-22 15:59:33,585 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:33,586 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 46 [2018-10-22 15:59:33,586 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:33,594 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:33,606 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 15:59:33,606 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:61, output treesize:33 [2018-10-22 15:59:33,642 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 20 [2018-10-22 15:59:33,644 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:33,645 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 13 [2018-10-22 15:59:33,645 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:33,647 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:33,649 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:33,649 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:28, output treesize:5 [2018-10-22 15:59:33,666 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 15 proven. 14 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-22 15:59:33,667 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:59:33,859 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 74 treesize of output 64 [2018-10-22 15:59:33,882 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:33,883 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 64 treesize of output 65 [2018-10-22 15:59:33,985 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:33,986 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:33,987 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:33,988 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:33,990 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:33,990 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:34,002 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 77 [2018-10-22 15:59:34,004 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 2 xjuncts. [2018-10-22 15:59:34,005 WARN L307 Elim1Store]: Array PQE input equivalent to true [2018-10-22 15:59:34,006 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:34,007 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:34,008 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:34,008 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:34,009 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:34,010 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:34,011 INFO L682 Elim1Store]: detected equality via solver [2018-10-22 15:59:34,022 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 77 [2018-10-22 15:59:34,023 INFO L267 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 2 xjuncts. [2018-10-22 15:59:34,043 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:34,045 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:34,051 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:34,051 INFO L202 ElimStorePlain]: Needed 6 recursive calls to eliminate 2 variables, input treesize:79, output treesize:16 [2018-10-22 15:59:34,059 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-10-22 15:59:34,060 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:59:34,061 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 13, 12, 15, 12] total 42 [2018-10-22 15:59:34,061 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:59:34,061 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-22 15:59:34,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-22 15:59:34,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1513, Unknown=1, NotChecked=0, Total=1722 [2018-10-22 15:59:34,062 INFO L87 Difference]: Start difference. First operand 106 states and 125 transitions. Second operand 25 states. [2018-10-22 15:59:35,361 WARN L179 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2018-10-22 15:59:36,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:59:36,980 INFO L93 Difference]: Finished difference Result 262 states and 320 transitions. [2018-10-22 15:59:36,980 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-22 15:59:36,981 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 39 [2018-10-22 15:59:36,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:59:36,984 INFO L225 Difference]: With dead ends: 262 [2018-10-22 15:59:36,984 INFO L226 Difference]: Without dead ends: 195 [2018-10-22 15:59:36,986 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 125 SyntacticMatches, 7 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1398 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=740, Invalid=4809, Unknown=1, NotChecked=0, Total=5550 [2018-10-22 15:59:36,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2018-10-22 15:59:36,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 122. [2018-10-22 15:59:36,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-10-22 15:59:37,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 146 transitions. [2018-10-22 15:59:37,000 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 146 transitions. Word has length 39 [2018-10-22 15:59:37,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:59:37,001 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 146 transitions. [2018-10-22 15:59:37,001 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-22 15:59:37,001 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 146 transitions. [2018-10-22 15:59:37,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-22 15:59:37,003 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:59:37,003 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:59:37,003 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:59:37,003 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:59:37,003 INFO L82 PathProgramCache]: Analyzing trace with hash 1926599722, now seen corresponding path program 2 times [2018-10-22 15:59:37,004 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:59:37,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:59:37,004 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:59:37,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:59:37,005 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:59:37,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:59:37,582 WARN L179 SmtUtils]: Spent 319.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 13 [2018-10-22 15:59:38,261 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:59:38,261 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:59:38,261 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:59:38,261 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:59:38,261 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:59:38,261 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:59:38,262 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:59:38,270 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:59:38,271 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:59:38,311 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:59:38,311 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:59:38,315 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:59:38,415 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 19 [2018-10-22 15:59:38,418 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:38,419 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 29 [2018-10-22 15:59:38,420 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:38,427 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:38,438 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-22 15:59:38,438 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:37, output treesize:30 [2018-10-22 15:59:38,464 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 24 [2018-10-22 15:59:38,468 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:38,469 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:38,470 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:38,475 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 55 [2018-10-22 15:59:38,475 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:38,483 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:38,493 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:38,493 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:24 [2018-10-22 15:59:38,515 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 20 [2018-10-22 15:59:38,517 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:38,519 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:38,520 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:38,525 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 43 [2018-10-22 15:59:38,525 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:38,533 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:38,545 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:38,546 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:43, output treesize:24 [2018-10-22 15:59:38,560 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 22 [2018-10-22 15:59:38,562 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:38,563 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:38,564 INFO L700 Elim1Store]: detected not equals via solver [2018-10-22 15:59:38,569 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 49 [2018-10-22 15:59:38,569 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:38,579 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:38,586 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:38,587 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:32, output treesize:19 [2018-10-22 15:59:38,635 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 18 [2018-10-22 15:59:38,643 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 10 [2018-10-22 15:59:38,643 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-22 15:59:38,645 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:38,647 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-22 15:59:38,647 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:26, output treesize:3 [2018-10-22 15:59:38,667 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:59:38,667 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:59:40,830 WARN L179 SmtUtils]: Spent 2.03 s on a formula simplification that was a NOOP. DAG size: 17 [2018-10-22 16:00:02,146 WARN L179 SmtUtils]: Spent 598.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2018-10-22 16:00:16,539 WARN L179 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 28 Received shutdown request... [2018-10-22 16:00:27,702 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-22 16:00:27,903 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:27,903 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-22 16:00:27,909 WARN L205 ceAbstractionStarter]: Timeout [2018-10-22 16:00:27,910 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 04:00:27 BoogieIcfgContainer [2018-10-22 16:00:27,910 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-22 16:00:27,910 INFO L168 Benchmark]: Toolchain (without parser) took 262387.14 ms. Allocated memory was 1.5 GB in the beginning and 3.2 GB in the end (delta: 1.7 GB). Free memory was 1.4 GB in the beginning and 1.9 GB in the end (delta: -516.0 MB). Peak memory consumption was 1.2 GB. Max. memory is 7.1 GB. [2018-10-22 16:00:27,911 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:00:27,911 INFO L168 Benchmark]: CACSL2BoogieTranslator took 347.37 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-22 16:00:27,911 INFO L168 Benchmark]: Boogie Procedure Inliner took 62.95 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:00:27,912 INFO L168 Benchmark]: Boogie Preprocessor took 55.86 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:00:27,912 INFO L168 Benchmark]: RCFGBuilder took 610.96 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 721.9 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -771.7 MB). Peak memory consumption was 18.0 MB. Max. memory is 7.1 GB. [2018-10-22 16:00:27,912 INFO L168 Benchmark]: TraceAbstraction took 261305.42 ms. Allocated memory was 2.3 GB in the beginning and 3.2 GB in the end (delta: 950.5 MB). Free memory was 2.2 GB in the beginning and 1.9 GB in the end (delta: 245.1 MB). Peak memory consumption was 1.2 GB. Max. memory is 7.1 GB. [2018-10-22 16:00:27,914 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 347.37 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 62.95 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 55.86 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 610.96 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 721.9 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -771.7 MB). Peak memory consumption was 18.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 261305.42 ms. Allocated memory was 2.3 GB in the beginning and 3.2 GB in the end (delta: 950.5 MB). Free memory was 2.2 GB in the beginning and 1.9 GB in the end (delta: 245.1 MB). Peak memory consumption was 1.2 GB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 44 with TraceHistMax 4,while TraceCheckSpWp was constructing backward predicates,while PredicateComparison was comparing new predicate (quantified with 0quantifier alternations) to 30 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 31 locations, 1 error locations. TIMEOUT Result, 261.2s OverallTime, 12 OverallIterations, 4 TraceHistogramMax, 27.6s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 342 SDtfs, 905 SDslu, 2659 SDs, 0 SdLazy, 3168 SolverSat, 549 SolverUnsat, 8 SolverUnknown, 0 SolverNotchecked, 20.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1302 GetRequests, 796 SyntacticMatches, 79 SemanticMatches, 427 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 8016 ImplicationChecksByTransitivity, 163.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=122occurred in iteration=11, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 9.7s AbstIntTime, 4 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 11 MinimizatonAttempts, 294 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 1.3s SatisfiabilityAnalysisTime, 170.6s InterpolantComputationTime, 838 NumberOfCodeBlocks, 830 NumberOfCodeBlocksAsserted, 37 NumberOfCheckSat, 1319 ConstructedInterpolants, 135 QuantifiedInterpolants, 646041 SizeOfPredicates, 460 NumberOfNonLiveVariables, 2552 ConjunctsInSsa, 847 ConjunctsInUnsatCore, 43 InterpolantComputations, 4 PerfectInterpolantSequences, 156/582 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown