java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/functions_true-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:04:40,818 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:04:40,820 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:04:40,831 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:04:40,832 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:04:40,833 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:04:40,834 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:04:40,836 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:04:40,837 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:04:40,838 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:04:40,839 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:04:40,839 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:04:40,840 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:04:40,841 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:04:40,842 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:04:40,843 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:04:40,844 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:04:40,846 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:04:40,847 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:04:40,849 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:04:40,850 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:04:40,851 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:04:40,853 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-22 16:04:40,861 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 16:04:40,885 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:04:40,886 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:04:40,887 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:04:40,889 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:04:40,890 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:04:40,890 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:04:40,890 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:04:40,890 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:04:40,890 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:04:40,891 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:04:40,891 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:04:40,891 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:04:40,892 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:04:40,892 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:04:40,892 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:04:40,892 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:04:40,892 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:04:40,893 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:04:40,893 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:04:40,893 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:04:40,894 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:04:40,894 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:04:40,894 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:04:40,894 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:04:40,894 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:04:40,895 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:04:40,895 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:04:40,895 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:04:40,895 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:04:40,896 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:04:40,896 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:04:40,896 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:04:40,896 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:04:40,896 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:04:40,951 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:04:40,963 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:04:40,967 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:04:40,968 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:04:40,968 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:04:40,969 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/functions_true-unreach-call1_true-termination.i [2018-10-22 16:04:41,024 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2c0824793/146cc10a4b364dbc894d01dcde49100a/FLAGb40d92b9c [2018-10-22 16:04:41,503 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:04:41,504 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/functions_true-unreach-call1_true-termination.i [2018-10-22 16:04:41,511 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2c0824793/146cc10a4b364dbc894d01dcde49100a/FLAGb40d92b9c [2018-10-22 16:04:41,526 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2c0824793/146cc10a4b364dbc894d01dcde49100a [2018-10-22 16:04:41,536 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:04:41,538 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:04:41,539 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:04:41,539 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:04:41,543 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:04:41,544 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:04:41" (1/1) ... [2018-10-22 16:04:41,547 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3502ec3b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:41, skipping insertion in model container [2018-10-22 16:04:41,547 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:04:41" (1/1) ... [2018-10-22 16:04:41,557 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:04:41,577 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:04:41,747 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:04:41,750 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:04:41,769 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:04:41,786 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:04:41,786 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:41 WrapperNode [2018-10-22 16:04:41,786 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:04:41,787 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:04:41,788 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:04:41,788 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:04:41,798 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:41" (1/1) ... [2018-10-22 16:04:41,803 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:41" (1/1) ... [2018-10-22 16:04:41,811 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:04:41,811 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:04:41,811 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:04:41,812 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:04:41,822 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:41" (1/1) ... [2018-10-22 16:04:41,822 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:41" (1/1) ... [2018-10-22 16:04:41,823 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:41" (1/1) ... [2018-10-22 16:04:41,823 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:41" (1/1) ... [2018-10-22 16:04:41,827 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:41" (1/1) ... [2018-10-22 16:04:41,832 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:41" (1/1) ... [2018-10-22 16:04:41,833 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:41" (1/1) ... [2018-10-22 16:04:41,834 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:04:41,835 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:04:41,835 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:04:41,835 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:04:41,836 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:41" (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 16:04:41,901 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:04:41,901 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:04:41,901 INFO L130 BoogieDeclarations]: Found specification of procedure f [2018-10-22 16:04:41,902 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2018-10-22 16:04:41,902 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:04:41,902 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:04:41,902 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:04:41,902 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:04:41,903 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:04:41,903 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:04:42,168 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:04:42,169 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:04:42 BoogieIcfgContainer [2018-10-22 16:04:42,169 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:04:42,170 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:04:42,170 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:04:42,173 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:04:42,174 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:04:41" (1/3) ... [2018-10-22 16:04:42,174 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b4e9bcd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:04:42, skipping insertion in model container [2018-10-22 16:04:42,175 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:04:41" (2/3) ... [2018-10-22 16:04:42,175 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b4e9bcd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:04:42, skipping insertion in model container [2018-10-22 16:04:42,175 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:04:42" (3/3) ... [2018-10-22 16:04:42,177 INFO L112 eAbstractionObserver]: Analyzing ICFG functions_true-unreach-call1_true-termination.i [2018-10-22 16:04:42,186 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:04:42,194 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:04:42,210 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:04:42,242 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:04:42,243 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:04:42,243 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:04:42,243 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:04:42,244 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:04:42,244 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:04:42,244 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:04:42,244 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:04:42,244 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:04:42,262 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2018-10-22 16:04:42,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-22 16:04:42,268 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:42,269 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:42,271 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:42,277 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:42,277 INFO L82 PathProgramCache]: Analyzing trace with hash 1196028990, now seen corresponding path program 1 times [2018-10-22 16:04:42,279 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:42,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:42,325 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:42,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:42,326 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:42,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:42,377 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 16:04:42,379 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:04:42,379 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:04:42,379 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:04:42,383 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:04:42,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:04:42,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:04:42,398 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 2 states. [2018-10-22 16:04:42,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:42,420 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-22 16:04:42,421 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:04:42,422 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-22 16:04:42,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:42,431 INFO L225 Difference]: With dead ends: 34 [2018-10-22 16:04:42,431 INFO L226 Difference]: Without dead ends: 17 [2018-10-22 16:04:42,435 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 16:04:42,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-10-22 16:04:42,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-10-22 16:04:42,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-22 16:04:42,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-22 16:04:42,473 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 10 [2018-10-22 16:04:42,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:42,474 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-22 16:04:42,474 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:04:42,474 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-22 16:04:42,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-22 16:04:42,475 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:42,475 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:42,475 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:42,475 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:42,476 INFO L82 PathProgramCache]: Analyzing trace with hash -1888530020, now seen corresponding path program 1 times [2018-10-22 16:04:42,476 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:42,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:42,477 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:42,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:42,477 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:42,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:42,580 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 16:04:42,581 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:04:42,581 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 16:04:42,581 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:04:42,582 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:04:42,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:04:42,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:04:42,584 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 3 states. [2018-10-22 16:04:42,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:42,648 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2018-10-22 16:04:42,648 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:04:42,649 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-22 16:04:42,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:42,651 INFO L225 Difference]: With dead ends: 26 [2018-10-22 16:04:42,651 INFO L226 Difference]: Without dead ends: 21 [2018-10-22 16:04:42,652 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:04:42,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-22 16:04:42,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2018-10-22 16:04:42,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-22 16:04:42,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-10-22 16:04:42,665 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 11 [2018-10-22 16:04:42,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:42,665 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-10-22 16:04:42,665 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:04:42,666 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-10-22 16:04:42,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-22 16:04:42,667 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:42,667 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:42,667 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:42,668 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:42,668 INFO L82 PathProgramCache]: Analyzing trace with hash 1261609818, now seen corresponding path program 1 times [2018-10-22 16:04:42,668 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:42,669 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:42,669 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:42,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:42,670 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:42,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:42,889 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 16:04:42,889 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:42,890 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:42,891 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-10-22 16:04:42,897 INFO L202 CegarAbsIntRunner]: [0], [1], [2], [6], [10], [14], [16], [18], [24], [27], [29], [35], [36], [37], [39], [40], [41] [2018-10-22 16:04:42,948 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:04:42,949 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:04:43,050 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:04:43,438 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:04:43,439 INFO L272 AbstractInterpreter]: Visited 17 different actions 121 times. Merged at 5 different actions 44 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-22 16:04:43,457 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:43,458 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:04:43,458 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:43,459 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 16:04:43,470 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:43,470 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:04:43,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:43,496 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:43,554 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 16:04:43,555 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:43,877 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-22 16:04:44,105 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 16:04:44,126 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:44,127 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 16:04:44,152 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:44,152 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:04:44,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:44,172 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:44,215 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 16:04:44,216 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:44,318 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 16:04:44,321 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:04:44,321 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-10-22 16:04:44,322 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:04:44,322 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 16:04:44,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 16:04:44,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:04:44,323 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 6 states. [2018-10-22 16:04:44,462 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-22 16:04:44,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:44,505 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-10-22 16:04:44,507 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 16:04:44,507 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2018-10-22 16:04:44,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:44,509 INFO L225 Difference]: With dead ends: 30 [2018-10-22 16:04:44,510 INFO L226 Difference]: Without dead ends: 25 [2018-10-22 16:04:44,511 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 62 SyntacticMatches, 7 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2018-10-22 16:04:44,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-22 16:04:44,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2018-10-22 16:04:44,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-22 16:04:44,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-10-22 16:04:44,518 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2018-10-22 16:04:44,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:44,519 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-10-22 16:04:44,519 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 16:04:44,519 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-10-22 16:04:44,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-22 16:04:44,521 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:44,521 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:44,521 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:44,522 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:44,522 INFO L82 PathProgramCache]: Analyzing trace with hash -1235124260, now seen corresponding path program 2 times [2018-10-22 16:04:44,522 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:44,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:44,523 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:44,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:44,524 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:44,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:44,797 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-22 16:04:44,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:44,798 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:44,798 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:04:44,798 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:04:44,799 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:44,799 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 16:04:44,818 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:04:44,818 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:04:44,837 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:04:44,837 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:44,840 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:44,942 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-22 16:04:44,943 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:45,586 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:04:45,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:45,607 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 16:04:45,623 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:04:45,623 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:04:45,651 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:04:45,652 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:45,656 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:45,705 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-22 16:04:45,705 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:45,816 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:04:45,817 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:04:45,818 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9, 8, 9] total 15 [2018-10-22 16:04:45,818 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:04:45,818 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 16:04:45,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 16:04:45,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2018-10-22 16:04:45,819 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 8 states. [2018-10-22 16:04:45,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:45,980 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-22 16:04:45,981 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 16:04:45,981 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2018-10-22 16:04:45,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:45,983 INFO L225 Difference]: With dead ends: 34 [2018-10-22 16:04:45,983 INFO L226 Difference]: Without dead ends: 29 [2018-10-22 16:04:45,984 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 84 SyntacticMatches, 11 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2018-10-22 16:04:45,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-22 16:04:45,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2018-10-22 16:04:45,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-22 16:04:45,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2018-10-22 16:04:45,991 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 25 [2018-10-22 16:04:45,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:45,991 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2018-10-22 16:04:45,992 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 16:04:45,992 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2018-10-22 16:04:45,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-22 16:04:45,993 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:45,993 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:45,993 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:45,993 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:45,994 INFO L82 PathProgramCache]: Analyzing trace with hash 1046211866, now seen corresponding path program 3 times [2018-10-22 16:04:45,994 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:45,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:45,995 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:04:45,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:45,995 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:46,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:46,243 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-22 16:04:46,243 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:46,243 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:46,243 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:04:46,244 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:04:46,244 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:46,244 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) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:04:46,252 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:04:46,252 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:04:46,300 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:04:46,300 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:46,304 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:46,365 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-22 16:04:46,365 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:46,884 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-22 16:04:46,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:46,905 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 16:04:46,925 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:04:46,925 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:04:46,977 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:04:46,978 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:46,982 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:47,028 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-22 16:04:47,028 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:47,258 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-22 16:04:47,259 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:04:47,259 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 12, 10, 12] total 20 [2018-10-22 16:04:47,259 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:04:47,260 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:04:47,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:04:47,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:04:47,261 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 10 states. [2018-10-22 16:04:47,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:47,461 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2018-10-22 16:04:47,463 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:04:47,463 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-22 16:04:47,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:47,465 INFO L225 Difference]: With dead ends: 38 [2018-10-22 16:04:47,465 INFO L226 Difference]: Without dead ends: 33 [2018-10-22 16:04:47,466 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 106 SyntacticMatches, 15 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=98, Invalid=408, Unknown=0, NotChecked=0, Total=506 [2018-10-22 16:04:47,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-22 16:04:47,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2018-10-22 16:04:47,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-22 16:04:47,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2018-10-22 16:04:47,475 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 32 [2018-10-22 16:04:47,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:47,475 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2018-10-22 16:04:47,475 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:04:47,475 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2018-10-22 16:04:47,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-22 16:04:47,477 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:47,477 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:47,477 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:47,478 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:47,478 INFO L82 PathProgramCache]: Analyzing trace with hash -1312440804, now seen corresponding path program 4 times [2018-10-22 16:04:47,478 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:47,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:47,479 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:04:47,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:47,479 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:47,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:47,745 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-10-22 16:04:47,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:47,745 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:47,746 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:04:47,746 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:04:47,746 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:47,746 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 16:04:47,761 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:04:47,761 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:04:47,798 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:04:47,799 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:47,802 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:47,877 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-10-22 16:04:47,878 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:48,302 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-22 16:04:48,405 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-22 16:04:48,743 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-22 16:04:48,764 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:48,764 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 16:04:48,779 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:04:48,780 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:04:48,813 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:04:48,814 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:48,818 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:48,956 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-10-22 16:04:48,956 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:49,286 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-22 16:04:49,288 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:04:49,288 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 15, 12, 15] total 25 [2018-10-22 16:04:49,288 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:04:49,289 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 16:04:49,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 16:04:49,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=508, Unknown=0, NotChecked=0, Total=600 [2018-10-22 16:04:49,290 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand 12 states. [2018-10-22 16:04:49,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:49,529 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2018-10-22 16:04:49,530 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 16:04:49,530 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2018-10-22 16:04:49,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:49,532 INFO L225 Difference]: With dead ends: 42 [2018-10-22 16:04:49,532 INFO L226 Difference]: Without dead ends: 37 [2018-10-22 16:04:49,533 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 128 SyntacticMatches, 19 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=144, Invalid=668, Unknown=0, NotChecked=0, Total=812 [2018-10-22 16:04:49,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-22 16:04:49,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2018-10-22 16:04:49,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-22 16:04:49,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2018-10-22 16:04:49,540 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 39 [2018-10-22 16:04:49,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:49,541 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2018-10-22 16:04:49,541 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 16:04:49,541 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2018-10-22 16:04:49,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-22 16:04:49,542 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:49,542 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:49,543 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:49,543 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:49,543 INFO L82 PathProgramCache]: Analyzing trace with hash -341760294, now seen corresponding path program 5 times [2018-10-22 16:04:49,543 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:49,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:49,544 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:04:49,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:49,545 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:49,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:50,022 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-22 16:04:50,022 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:50,022 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:50,022 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:04:50,022 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:04:50,023 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:50,023 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) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:04:50,030 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:04:50,030 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:04:50,084 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:04:50,084 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:50,089 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:50,158 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-22 16:04:50,158 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:51,083 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-10-22 16:04:51,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:51,108 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 16:04:51,124 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:04:51,125 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:04:51,199 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:04:51,200 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:51,205 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:51,267 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-22 16:04:51,268 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:51,433 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-10-22 16:04:51,440 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:04:51,441 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 18, 14, 18] total 30 [2018-10-22 16:04:51,441 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:04:51,441 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-22 16:04:51,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-22 16:04:51,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=747, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:04:51,442 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 14 states. [2018-10-22 16:04:52,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:52,289 INFO L93 Difference]: Finished difference Result 46 states and 52 transitions. [2018-10-22 16:04:52,290 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 16:04:52,290 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 46 [2018-10-22 16:04:52,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:52,291 INFO L225 Difference]: With dead ends: 46 [2018-10-22 16:04:52,291 INFO L226 Difference]: Without dead ends: 41 [2018-10-22 16:04:52,293 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 150 SyntacticMatches, 23 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=198, Invalid=992, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 16:04:52,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-10-22 16:04:52,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2018-10-22 16:04:52,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-22 16:04:52,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2018-10-22 16:04:52,299 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 46 [2018-10-22 16:04:52,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:52,299 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2018-10-22 16:04:52,299 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-22 16:04:52,299 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2018-10-22 16:04:52,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-22 16:04:52,300 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:52,300 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:52,300 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:52,301 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:52,301 INFO L82 PathProgramCache]: Analyzing trace with hash -2000679844, now seen corresponding path program 6 times [2018-10-22 16:04:52,301 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:52,302 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:52,302 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:04:52,302 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:52,302 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:52,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:52,603 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-22 16:04:52,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:52,604 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:52,604 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:04:52,604 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:04:52,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:52,605 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 16:04:52,615 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:04:52,615 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:04:52,697 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 16:04:52,697 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:52,700 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:52,786 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-22 16:04:52,786 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:54,407 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:04:54,427 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:54,427 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 16:04:54,442 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:04:54,442 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:04:54,536 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 16:04:54,537 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:54,542 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:54,600 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-22 16:04:54,600 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:54,787 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:04:54,788 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:04:54,788 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 21, 16, 21] total 35 [2018-10-22 16:04:54,789 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:04:54,789 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:04:54,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:04:54,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1032, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 16:04:54,790 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand 16 states. [2018-10-22 16:04:55,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:55,260 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2018-10-22 16:04:55,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 16:04:55,261 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 53 [2018-10-22 16:04:55,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:55,263 INFO L225 Difference]: With dead ends: 50 [2018-10-22 16:04:55,263 INFO L226 Difference]: Without dead ends: 45 [2018-10-22 16:04:55,264 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 172 SyntacticMatches, 27 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=260, Invalid=1380, Unknown=0, NotChecked=0, Total=1640 [2018-10-22 16:04:55,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-22 16:04:55,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2018-10-22 16:04:55,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-22 16:04:55,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2018-10-22 16:04:55,271 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 53 [2018-10-22 16:04:55,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:55,272 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2018-10-22 16:04:55,272 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:04:55,272 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2018-10-22 16:04:55,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-10-22 16:04:55,273 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:55,273 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:55,273 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:55,274 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:55,274 INFO L82 PathProgramCache]: Analyzing trace with hash -1151446886, now seen corresponding path program 7 times [2018-10-22 16:04:55,274 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:55,275 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:55,275 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:04:55,275 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:55,275 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:55,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:55,763 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-10-22 16:04:55,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:55,763 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:55,763 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:04:55,764 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:04:55,764 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:55,764 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 16:04:55,773 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:04:55,774 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:04:55,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:55,806 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:56,067 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-10-22 16:04:56,067 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:56,234 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-22 16:05:00,011 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 140 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-10-22 16:05:00,032 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:00,032 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 16:05:00,047 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:00,048 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:05:00,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:00,091 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:00,162 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-10-22 16:05:00,162 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:00,518 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 140 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-10-22 16:05:00,520 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:00,520 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 24, 18, 24] total 40 [2018-10-22 16:05:00,520 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:00,521 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 16:05:00,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 16:05:00,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=1363, Unknown=1, NotChecked=0, Total=1560 [2018-10-22 16:05:00,523 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand 18 states. [2018-10-22 16:05:01,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:01,103 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2018-10-22 16:05:01,103 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 16:05:01,104 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 60 [2018-10-22 16:05:01,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:01,106 INFO L225 Difference]: With dead ends: 54 [2018-10-22 16:05:01,106 INFO L226 Difference]: Without dead ends: 49 [2018-10-22 16:05:01,107 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 194 SyntacticMatches, 31 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=329, Invalid=1832, Unknown=1, NotChecked=0, Total=2162 [2018-10-22 16:05:01,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-22 16:05:01,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2018-10-22 16:05:01,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-22 16:05:01,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 54 transitions. [2018-10-22 16:05:01,114 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 54 transitions. Word has length 60 [2018-10-22 16:05:01,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:01,115 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 54 transitions. [2018-10-22 16:05:01,115 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 16:05:01,115 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 54 transitions. [2018-10-22 16:05:01,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-22 16:05:01,116 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:01,116 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:01,117 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:01,117 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:01,117 INFO L82 PathProgramCache]: Analyzing trace with hash -210474340, now seen corresponding path program 8 times [2018-10-22 16:05:01,117 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:01,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:01,118 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:01,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:01,118 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:01,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:01,729 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:05:01,730 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:01,730 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:01,730 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:01,730 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:01,730 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:01,730 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 16:05:01,738 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:05:01,738 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:01,758 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:05:01,758 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:01,760 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:01,960 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:05:01,960 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:06,048 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 184 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-22 16:05:06,070 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:06,070 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 16:05:06,087 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:05:06,087 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:06,141 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:05:06,141 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:06,146 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:06,207 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:05:06,207 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:06,503 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 184 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-22 16:05:06,504 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:06,504 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 27, 20, 27] total 45 [2018-10-22 16:05:06,505 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:06,505 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-22 16:05:06,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-22 16:05:06,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=1740, Unknown=1, NotChecked=0, Total=1980 [2018-10-22 16:05:06,506 INFO L87 Difference]: Start difference. First operand 47 states and 54 transitions. Second operand 20 states. [2018-10-22 16:05:07,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:07,121 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2018-10-22 16:05:07,121 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-22 16:05:07,122 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2018-10-22 16:05:07,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:07,123 INFO L225 Difference]: With dead ends: 58 [2018-10-22 16:05:07,123 INFO L226 Difference]: Without dead ends: 53 [2018-10-22 16:05:07,125 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 216 SyntacticMatches, 35 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 361 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=407, Invalid=2348, Unknown=1, NotChecked=0, Total=2756 [2018-10-22 16:05:07,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-10-22 16:05:07,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2018-10-22 16:05:07,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-22 16:05:07,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 59 transitions. [2018-10-22 16:05:07,131 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 59 transitions. Word has length 67 [2018-10-22 16:05:07,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:07,132 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 59 transitions. [2018-10-22 16:05:07,132 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-22 16:05:07,132 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 59 transitions. [2018-10-22 16:05:07,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-22 16:05:07,133 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:07,134 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:07,134 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:07,134 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:07,134 INFO L82 PathProgramCache]: Analyzing trace with hash 1156541018, now seen corresponding path program 9 times [2018-10-22 16:05:07,134 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:07,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:07,135 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:07,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:07,135 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:07,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:07,713 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-22 16:05:07,713 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:07,713 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:07,713 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:07,713 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:07,713 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:07,714 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 16:05:07,722 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:05:07,722 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:05:20,516 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:05:20,516 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:20,519 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:20,570 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-22 16:05:20,570 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:23,022 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-10-22 16:05:23,044 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:23,044 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 19 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 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:23,062 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:05:23,062 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:05:23,295 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:05:23,295 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:23,300 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:23,581 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-22 16:05:23,581 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:23,960 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-10-22 16:05:23,961 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:23,961 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 30, 22, 30] total 50 [2018-10-22 16:05:23,962 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:23,962 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 16:05:23,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 16:05:23,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=2163, Unknown=0, NotChecked=0, Total=2450 [2018-10-22 16:05:23,963 INFO L87 Difference]: Start difference. First operand 51 states and 59 transitions. Second operand 22 states. [2018-10-22 16:05:24,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:24,863 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2018-10-22 16:05:24,864 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 16:05:24,864 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 74 [2018-10-22 16:05:24,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:24,866 INFO L225 Difference]: With dead ends: 62 [2018-10-22 16:05:24,866 INFO L226 Difference]: Without dead ends: 57 [2018-10-22 16:05:24,868 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 238 SyntacticMatches, 39 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 478 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=494, Invalid=2928, Unknown=0, NotChecked=0, Total=3422 [2018-10-22 16:05:24,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-22 16:05:24,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2018-10-22 16:05:24,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-10-22 16:05:24,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2018-10-22 16:05:24,876 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 74 [2018-10-22 16:05:24,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:24,877 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2018-10-22 16:05:24,877 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 16:05:24,877 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2018-10-22 16:05:24,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-10-22 16:05:24,879 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:24,879 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:24,880 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:24,880 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:24,880 INFO L82 PathProgramCache]: Analyzing trace with hash -1694050084, now seen corresponding path program 10 times [2018-10-22 16:05:24,880 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:24,881 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:24,881 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:24,881 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:24,881 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:24,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:25,546 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-10-22 16:05:25,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:25,546 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:25,546 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:25,546 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:25,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:25,547 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:25,554 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:05:25,554 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:05:25,578 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:05:25,578 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:25,581 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:25,662 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-10-22 16:05:25,662 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:28,871 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 290 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-22 16:05:28,891 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:28,892 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 21 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 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:28,909 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:05:28,909 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:05:28,974 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:05:28,974 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:28,979 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:29,038 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-10-22 16:05:29,039 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:29,423 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 290 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-22 16:05:29,424 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:29,425 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 33, 24, 33] total 55 [2018-10-22 16:05:29,425 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:29,425 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-22 16:05:29,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-22 16:05:29,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=338, Invalid=2632, Unknown=0, NotChecked=0, Total=2970 [2018-10-22 16:05:29,427 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand 24 states. [2018-10-22 16:05:30,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:30,224 INFO L93 Difference]: Finished difference Result 66 states and 77 transitions. [2018-10-22 16:05:30,224 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-22 16:05:30,224 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 81 [2018-10-22 16:05:30,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:30,226 INFO L225 Difference]: With dead ends: 66 [2018-10-22 16:05:30,226 INFO L226 Difference]: Without dead ends: 61 [2018-10-22 16:05:30,228 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 366 GetRequests, 260 SyntacticMatches, 43 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 586 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=588, Invalid=3572, Unknown=0, NotChecked=0, Total=4160 [2018-10-22 16:05:30,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-22 16:05:30,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2018-10-22 16:05:30,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-22 16:05:30,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 69 transitions. [2018-10-22 16:05:30,234 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 69 transitions. Word has length 81 [2018-10-22 16:05:30,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:30,235 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 69 transitions. [2018-10-22 16:05:30,235 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-22 16:05:30,235 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 69 transitions. [2018-10-22 16:05:30,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-10-22 16:05:30,236 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:30,236 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:30,236 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:30,237 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:30,237 INFO L82 PathProgramCache]: Analyzing trace with hash 246445082, now seen corresponding path program 11 times [2018-10-22 16:05:30,237 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:30,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:30,238 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:30,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:30,238 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:30,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:30,949 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-22 16:05:30,949 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:30,949 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:30,949 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:30,950 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:30,950 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:30,950 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:30,957 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:05:30,957 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:35,874 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 16:05:35,874 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:35,878 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:35,945 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-22 16:05:35,945 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:39,638 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 352 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-10-22 16:05:39,659 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:39,659 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 23 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 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:05:39,675 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:05:39,675 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:40,019 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 16:05:40,019 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:40,028 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:40,106 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-22 16:05:40,106 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:40,429 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 352 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-10-22 16:05:40,431 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:40,431 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 36, 26, 36] total 60 [2018-10-22 16:05:40,431 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:40,432 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-22 16:05:40,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-22 16:05:40,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=393, Invalid=3147, Unknown=0, NotChecked=0, Total=3540 [2018-10-22 16:05:40,434 INFO L87 Difference]: Start difference. First operand 59 states and 69 transitions. Second operand 26 states. [2018-10-22 16:05:41,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:41,765 INFO L93 Difference]: Finished difference Result 70 states and 82 transitions. [2018-10-22 16:05:41,766 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-22 16:05:41,766 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 88 [2018-10-22 16:05:41,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:41,768 INFO L225 Difference]: With dead ends: 70 [2018-10-22 16:05:41,768 INFO L226 Difference]: Without dead ends: 65 [2018-10-22 16:05:41,770 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 282 SyntacticMatches, 47 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 705 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=690, Invalid=4280, Unknown=0, NotChecked=0, Total=4970 [2018-10-22 16:05:41,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-10-22 16:05:41,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2018-10-22 16:05:41,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-22 16:05:41,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 74 transitions. [2018-10-22 16:05:41,775 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 74 transitions. Word has length 88 [2018-10-22 16:05:41,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:41,776 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 74 transitions. [2018-10-22 16:05:41,776 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-22 16:05:41,776 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 74 transitions. [2018-10-22 16:05:41,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-22 16:05:41,778 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:41,778 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:41,778 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:41,778 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:41,778 INFO L82 PathProgramCache]: Analyzing trace with hash 1503352604, now seen corresponding path program 12 times [2018-10-22 16:05:41,779 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:41,779 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:41,779 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:41,779 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:41,780 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:41,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:42,309 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-22 16:05:42,309 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:42,309 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:42,310 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:42,310 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:42,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:42,310 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:05:42,318 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:05:42,318 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:06:08,465 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 16:06:08,465 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:08,534 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:08,789 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-22 16:06:08,790 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:11,844 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:06:11,870 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:11,870 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 25 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 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:06:11,885 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:06:11,885 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:06:12,217 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 16:06:12,218 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:12,225 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:12,298 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-22 16:06:12,298 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:12,727 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:06:12,729 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:06:12,729 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 39, 28, 39] total 65 [2018-10-22 16:06:12,729 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:06:12,729 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-22 16:06:12,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-22 16:06:12,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=452, Invalid=3708, Unknown=0, NotChecked=0, Total=4160 [2018-10-22 16:06:12,731 INFO L87 Difference]: Start difference. First operand 63 states and 74 transitions. Second operand 28 states. [2018-10-22 16:06:13,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:06:13,960 INFO L93 Difference]: Finished difference Result 74 states and 87 transitions. [2018-10-22 16:06:13,960 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-22 16:06:13,961 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 95 [2018-10-22 16:06:13,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:06:13,963 INFO L225 Difference]: With dead ends: 74 [2018-10-22 16:06:13,963 INFO L226 Difference]: Without dead ends: 69 [2018-10-22 16:06:13,965 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 304 SyntacticMatches, 51 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 835 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=800, Invalid=5052, Unknown=0, NotChecked=0, Total=5852 [2018-10-22 16:06:13,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-22 16:06:13,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2018-10-22 16:06:13,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-10-22 16:06:13,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 79 transitions. [2018-10-22 16:06:13,971 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 79 transitions. Word has length 95 [2018-10-22 16:06:13,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:06:13,971 INFO L481 AbstractCegarLoop]: Abstraction has 67 states and 79 transitions. [2018-10-22 16:06:13,972 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-22 16:06:13,972 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 79 transitions. [2018-10-22 16:06:13,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-10-22 16:06:13,973 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:06:13,973 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:06:13,973 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:06:13,974 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:13,974 INFO L82 PathProgramCache]: Analyzing trace with hash 1308454362, now seen corresponding path program 13 times [2018-10-22 16:06:13,974 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:06:13,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:13,975 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:06:13,975 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:13,975 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:06:13,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:14,930 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-10-22 16:06:14,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:14,930 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:06:14,930 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:06:14,930 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:06:14,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:14,931 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:06:14,938 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:06:14,939 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:06:14,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:14,974 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:15,045 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-10-22 16:06:15,045 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:19,146 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 494 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-10-22 16:06:19,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:19,166 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 27 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 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:06:19,181 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:06:19,181 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:06:19,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:19,255 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:19,365 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-10-22 16:06:19,365 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:19,692 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 494 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-10-22 16:06:19,694 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:06:19,694 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 42, 30, 42] total 70 [2018-10-22 16:06:19,695 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:06:19,695 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-22 16:06:19,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-22 16:06:19,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=515, Invalid=4315, Unknown=0, NotChecked=0, Total=4830 [2018-10-22 16:06:19,697 INFO L87 Difference]: Start difference. First operand 67 states and 79 transitions. Second operand 30 states. [2018-10-22 16:06:20,539 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-22 16:06:21,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:06:21,244 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-10-22 16:06:21,244 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-22 16:06:21,245 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 102 [2018-10-22 16:06:21,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:06:21,246 INFO L225 Difference]: With dead ends: 78 [2018-10-22 16:06:21,246 INFO L226 Difference]: Without dead ends: 73 [2018-10-22 16:06:21,249 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 326 SyntacticMatches, 55 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 976 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=918, Invalid=5888, Unknown=0, NotChecked=0, Total=6806 [2018-10-22 16:06:21,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-10-22 16:06:21,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2018-10-22 16:06:21,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-10-22 16:06:21,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 84 transitions. [2018-10-22 16:06:21,255 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 84 transitions. Word has length 102 [2018-10-22 16:06:21,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:06:21,256 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 84 transitions. [2018-10-22 16:06:21,256 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-22 16:06:21,256 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 84 transitions. [2018-10-22 16:06:21,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-22 16:06:21,257 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:06:21,257 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:06:21,257 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:06:21,257 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:21,258 INFO L82 PathProgramCache]: Analyzing trace with hash 2052449628, now seen corresponding path program 14 times [2018-10-22 16:06:21,258 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:06:21,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:21,258 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:06:21,259 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:21,259 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:06:21,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:22,754 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-22 16:06:22,755 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:22,755 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:06:22,755 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:06:22,755 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:06:22,755 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:22,755 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:06:22,767 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:06:22,768 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:06:22,803 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:06:22,804 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:22,808 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:22,885 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-22 16:06:22,885 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:28,243 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 574 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-22 16:06:28,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:28,264 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 29 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 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:06:28,278 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:06:28,278 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:06:28,361 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:06:28,361 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:28,367 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:28,457 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-22 16:06:28,457 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:28,811 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 574 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-22 16:06:28,813 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:06:28,813 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 45, 32, 45] total 75 [2018-10-22 16:06:28,813 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:06:28,813 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-22 16:06:28,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-22 16:06:28,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=582, Invalid=4968, Unknown=0, NotChecked=0, Total=5550 [2018-10-22 16:06:28,816 INFO L87 Difference]: Start difference. First operand 71 states and 84 transitions. Second operand 32 states. [2018-10-22 16:06:30,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:06:30,414 INFO L93 Difference]: Finished difference Result 82 states and 97 transitions. [2018-10-22 16:06:30,414 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-22 16:06:30,414 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 109 [2018-10-22 16:06:30,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:06:30,416 INFO L225 Difference]: With dead ends: 82 [2018-10-22 16:06:30,416 INFO L226 Difference]: Without dead ends: 77 [2018-10-22 16:06:30,417 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 348 SyntacticMatches, 59 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1128 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=1044, Invalid=6788, Unknown=0, NotChecked=0, Total=7832 [2018-10-22 16:06:30,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-10-22 16:06:30,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2018-10-22 16:06:30,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-22 16:06:30,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 89 transitions. [2018-10-22 16:06:30,423 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 89 transitions. Word has length 109 [2018-10-22 16:06:30,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:06:30,424 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 89 transitions. [2018-10-22 16:06:30,424 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-22 16:06:30,424 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 89 transitions. [2018-10-22 16:06:30,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-22 16:06:30,425 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:06:30,425 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:06:30,426 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:06:30,426 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:30,426 INFO L82 PathProgramCache]: Analyzing trace with hash -1489872998, now seen corresponding path program 15 times [2018-10-22 16:06:30,426 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:06:30,427 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:30,427 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:06:30,427 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:30,427 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:06:30,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:31,445 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-22 16:06:31,446 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:31,446 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:06:31,446 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:06:31,446 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:06:31,446 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:31,446 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:06:31,454 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:06:31,454 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:03,547 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:08:03,547 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:05,669 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:05,753 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-22 16:08:05,754 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:11,402 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 660 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-10-22 16:08:11,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:11,423 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 31 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 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:11,439 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:11,440 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:12,029 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:08:12,029 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:12,036 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:12,170 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-22 16:08:12,170 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:12,910 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 660 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-10-22 16:08:12,912 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:12,912 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 48, 34, 48] total 80 [2018-10-22 16:08:12,912 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:12,912 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-22 16:08:12,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-22 16:08:12,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=653, Invalid=5667, Unknown=0, NotChecked=0, Total=6320 [2018-10-22 16:08:12,914 INFO L87 Difference]: Start difference. First operand 75 states and 89 transitions. Second operand 34 states. [2018-10-22 16:08:13,669 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-22 16:08:15,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:15,289 INFO L93 Difference]: Finished difference Result 86 states and 102 transitions. [2018-10-22 16:08:15,289 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-22 16:08:15,289 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 116 [2018-10-22 16:08:15,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:15,291 INFO L225 Difference]: With dead ends: 86 [2018-10-22 16:08:15,291 INFO L226 Difference]: Without dead ends: 81 [2018-10-22 16:08:15,293 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 370 SyntacticMatches, 63 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1291 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=1178, Invalid=7752, Unknown=0, NotChecked=0, Total=8930 [2018-10-22 16:08:15,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-10-22 16:08:15,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2018-10-22 16:08:15,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-22 16:08:15,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 94 transitions. [2018-10-22 16:08:15,298 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 94 transitions. Word has length 116 [2018-10-22 16:08:15,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:15,299 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 94 transitions. [2018-10-22 16:08:15,299 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-22 16:08:15,299 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 94 transitions. [2018-10-22 16:08:15,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-10-22 16:08:15,300 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:15,300 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:15,300 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:15,301 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:15,301 INFO L82 PathProgramCache]: Analyzing trace with hash -111508580, now seen corresponding path program 16 times [2018-10-22 16:08:15,301 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:15,302 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:15,302 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:15,302 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:15,302 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:15,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:17,061 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-10-22 16:08:17,062 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:17,062 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:17,062 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:17,062 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:17,062 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:17,062 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:17,070 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:17,071 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:17,110 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:17,111 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:17,116 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:17,203 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-10-22 16:08:17,203 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:25,217 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 752 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-22 16:08:25,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:25,238 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 33 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 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:25,255 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:25,256 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:25,357 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:25,357 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:25,364 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:25,471 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-10-22 16:08:25,471 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:25,923 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 752 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-22 16:08:25,924 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:25,924 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 51, 36, 51] total 85 [2018-10-22 16:08:25,924 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:25,926 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-22 16:08:25,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-22 16:08:25,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=727, Invalid=6412, Unknown=1, NotChecked=0, Total=7140 [2018-10-22 16:08:25,927 INFO L87 Difference]: Start difference. First operand 79 states and 94 transitions. Second operand 36 states. [2018-10-22 16:08:27,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:27,891 INFO L93 Difference]: Finished difference Result 90 states and 107 transitions. [2018-10-22 16:08:27,892 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-22 16:08:27,892 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 123 [2018-10-22 16:08:27,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:27,893 INFO L225 Difference]: With dead ends: 90 [2018-10-22 16:08:27,893 INFO L226 Difference]: Without dead ends: 85 [2018-10-22 16:08:27,895 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 558 GetRequests, 392 SyntacticMatches, 67 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1447 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=1319, Invalid=8780, Unknown=1, NotChecked=0, Total=10100 [2018-10-22 16:08:27,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-22 16:08:27,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2018-10-22 16:08:27,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-10-22 16:08:27,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 99 transitions. [2018-10-22 16:08:27,900 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 99 transitions. Word has length 123 [2018-10-22 16:08:27,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:27,900 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 99 transitions. [2018-10-22 16:08:27,900 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-22 16:08:27,901 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 99 transitions. [2018-10-22 16:08:27,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2018-10-22 16:08:27,901 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:27,902 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:27,902 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:27,902 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:27,902 INFO L82 PathProgramCache]: Analyzing trace with hash -307547814, now seen corresponding path program 17 times [2018-10-22 16:08:27,902 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:27,903 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:27,903 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:27,903 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:27,903 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:27,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:28,946 INFO L134 CoverageAnalysis]: Checked inductivity of 986 backedges. 0 proven. 578 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2018-10-22 16:08:28,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:28,946 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:28,946 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:28,946 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:28,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:28,946 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:28,953 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:28,953 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown