java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/half_2_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:15:13,594 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:15:13,596 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:15:13,607 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:15:13,608 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:15:13,609 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:15:13,610 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:15:13,614 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:15:13,617 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:15:13,620 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:15:13,622 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:15:13,623 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:15:13,624 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:15:13,625 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:15:13,628 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:15:13,629 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:15:13,630 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:15:13,638 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:15:13,643 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:15:13,645 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:15:13,646 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:15:13,647 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:15:13,652 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:15:13,654 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:15:13,654 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:15:13,655 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:15:13,657 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:15:13,657 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:15:13,660 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:15:13,661 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:15:13,663 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:15:13,664 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-24 12:15:13,668 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-24 12:15:13,697 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:15:13,699 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:15:13,700 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:15:13,700 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:15:13,700 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:15:13,700 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:15:13,701 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:15:13,701 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:15:13,701 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:15:13,701 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:15:13,701 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:15:13,701 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:15:13,702 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:15:13,702 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:15:13,703 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:15:13,703 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:15:13,703 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:15:13,703 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:15:13,703 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:15:13,704 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:15:13,704 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:15:13,704 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:15:13,704 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:15:13,704 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:15:13,705 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:15:13,708 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:15:13,708 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:15:13,708 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:15:13,709 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:15:13,709 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:15:13,709 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:15:13,709 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:15:13,709 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:15:13,710 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:15:13,759 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:15:13,772 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:15:13,776 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:15:13,778 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:15:13,778 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:15:13,779 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-invgen/half_2_true-unreach-call_true-termination.i [2018-10-24 12:15:13,851 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2fbb6bdab/48ca0c3f836d4bd387c99452f3a4b97d/FLAG4c5dc6ee7 [2018-10-24 12:15:14,326 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:15:14,326 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/half_2_true-unreach-call_true-termination.i [2018-10-24 12:15:14,332 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2fbb6bdab/48ca0c3f836d4bd387c99452f3a4b97d/FLAG4c5dc6ee7 [2018-10-24 12:15:14,347 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2fbb6bdab/48ca0c3f836d4bd387c99452f3a4b97d [2018-10-24 12:15:14,361 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:15:14,362 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:15:14,363 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:15:14,363 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:15:14,367 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:15:14,368 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:15:14" (1/1) ... [2018-10-24 12:15:14,371 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ed858fb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:15:14, skipping insertion in model container [2018-10-24 12:15:14,371 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:15:14" (1/1) ... [2018-10-24 12:15:14,382 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:15:14,401 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:15:14,578 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:15:14,582 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:15:14,604 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:15:14,623 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:15:14,624 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:15:14 WrapperNode [2018-10-24 12:15:14,624 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:15:14,625 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:15:14,625 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:15:14,625 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:15:14,635 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:15:14" (1/1) ... [2018-10-24 12:15:14,640 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:15:14" (1/1) ... [2018-10-24 12:15:14,646 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:15:14,646 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:15:14,647 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:15:14,647 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:15:14,655 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:15:14" (1/1) ... [2018-10-24 12:15:14,655 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:15:14" (1/1) ... [2018-10-24 12:15:14,656 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:15:14" (1/1) ... [2018-10-24 12:15:14,656 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:15:14" (1/1) ... [2018-10-24 12:15:14,659 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:15:14" (1/1) ... [2018-10-24 12:15:14,666 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:15:14" (1/1) ... [2018-10-24 12:15:14,668 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:15:14" (1/1) ... [2018-10-24 12:15:14,669 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:15:14,670 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:15:14,670 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:15:14,670 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:15:14,671 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:15:14" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:15:14,733 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:15:14,733 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:15:14,733 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:15:14,733 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:15:14,733 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:15:14,733 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:15:14,734 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:15:14,734 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:15:15,049 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:15:15,050 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:15:15 BoogieIcfgContainer [2018-10-24 12:15:15,050 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:15:15,051 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:15:15,051 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:15:15,054 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:15:15,054 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:15:14" (1/3) ... [2018-10-24 12:15:15,055 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b145cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:15:15, skipping insertion in model container [2018-10-24 12:15:15,055 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:15:14" (2/3) ... [2018-10-24 12:15:15,056 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b145cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:15:15, skipping insertion in model container [2018-10-24 12:15:15,056 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:15:15" (3/3) ... [2018-10-24 12:15:15,057 INFO L112 eAbstractionObserver]: Analyzing ICFG half_2_true-unreach-call_true-termination.i [2018-10-24 12:15:15,067 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:15:15,075 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:15:15,089 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:15:15,120 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:15:15,120 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:15:15,120 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:15:15,121 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:15:15,121 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:15:15,121 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:15:15,121 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:15:15,121 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:15:15,137 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2018-10-24 12:15:15,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-24 12:15:15,143 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:15,144 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:15,147 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:15,152 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:15,152 INFO L82 PathProgramCache]: Analyzing trace with hash 123572206, now seen corresponding path program 1 times [2018-10-24 12:15:15,154 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:15,201 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:15,201 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:15,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:15,202 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:15,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:15,262 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:15,264 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:15:15,264 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:15:15,265 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:15:15,269 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:15:15,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:15:15,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:15:15,287 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 2 states. [2018-10-24 12:15:15,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:15,311 INFO L93 Difference]: Finished difference Result 40 states and 48 transitions. [2018-10-24 12:15:15,311 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:15:15,312 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 14 [2018-10-24 12:15:15,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:15,321 INFO L225 Difference]: With dead ends: 40 [2018-10-24 12:15:15,322 INFO L226 Difference]: Without dead ends: 19 [2018-10-24 12:15:15,325 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:15:15,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-24 12:15:15,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-24 12:15:15,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-24 12:15:15,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-10-24 12:15:15,362 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2018-10-24 12:15:15,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:15,363 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-10-24 12:15:15,363 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:15:15,363 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-10-24 12:15:15,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-24 12:15:15,364 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:15,364 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:15,365 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:15,365 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:15,365 INFO L82 PathProgramCache]: Analyzing trace with hash -204041864, now seen corresponding path program 1 times [2018-10-24 12:15:15,366 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:15,367 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:15,367 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:15,367 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:15,367 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:15,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:15,589 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:15,589 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:15:15,589 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-24 12:15:15,589 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:15:15,591 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:15:15,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:15:15,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 12:15:15,592 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 5 states. [2018-10-24 12:15:15,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:15,795 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2018-10-24 12:15:15,796 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:15:15,796 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-10-24 12:15:15,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:15,797 INFO L225 Difference]: With dead ends: 34 [2018-10-24 12:15:15,797 INFO L226 Difference]: Without dead ends: 21 [2018-10-24 12:15:15,799 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:15:15,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-24 12:15:15,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-10-24 12:15:15,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-24 12:15:15,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-10-24 12:15:15,804 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 15 [2018-10-24 12:15:15,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:15,805 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-10-24 12:15:15,805 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:15:15,805 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-10-24 12:15:15,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 12:15:15,806 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:15,806 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:15,807 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:15,807 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:15,808 INFO L82 PathProgramCache]: Analyzing trace with hash 615296882, now seen corresponding path program 1 times [2018-10-24 12:15:15,808 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:15,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:15,809 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:15,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:15,810 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:15,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:16,211 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:16,212 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:16,212 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:16,213 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 18 with the following transitions: [2018-10-24 12:15:16,217 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [16], [18], [22], [26], [32], [40], [43], [45], [51], [52], [53], [55] [2018-10-24 12:15:16,269 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:15:16,269 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:15:16,442 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:15:16,746 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:15:16,748 INFO L272 AbstractInterpreter]: Visited 16 different actions 116 times. Merged at 6 different actions 60 times. Widened at 2 different actions 12 times. Found 1 fixpoints after 1 different actions. Largest state had 6 variables. [2018-10-24 12:15:16,792 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:16,794 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:15:16,794 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:16,794 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:16,813 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:16,813 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:15:16,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:16,852 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:17,034 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:17,035 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:17,386 WARN L179 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2018-10-24 12:15:17,500 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:17,523 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:17,523 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-24 12:15:17,524 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:17,524 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:15:17,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:15:17,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:15:17,525 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 9 states. [2018-10-24 12:15:18,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:18,088 INFO L93 Difference]: Finished difference Result 38 states and 41 transitions. [2018-10-24 12:15:18,088 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:15:18,089 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 17 [2018-10-24 12:15:18,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:18,089 INFO L225 Difference]: With dead ends: 38 [2018-10-24 12:15:18,090 INFO L226 Difference]: Without dead ends: 23 [2018-10-24 12:15:18,091 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 26 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:15:18,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-10-24 12:15:18,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-10-24 12:15:18,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-24 12:15:18,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-10-24 12:15:18,097 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 17 [2018-10-24 12:15:18,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:18,097 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-10-24 12:15:18,097 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:15:18,097 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-10-24 12:15:18,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-24 12:15:18,098 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:18,098 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:18,099 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:18,099 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:18,099 INFO L82 PathProgramCache]: Analyzing trace with hash 2020816620, now seen corresponding path program 2 times [2018-10-24 12:15:18,099 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:18,100 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:18,100 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:18,101 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:18,101 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:18,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:18,229 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:18,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:18,230 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:18,230 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:18,230 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:18,231 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:18,231 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:18,247 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:15:18,247 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:15:18,299 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:15:18,299 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:15:18,302 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:18,374 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:18,375 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:18,460 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:18,480 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:18,480 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-10-24 12:15:18,480 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:18,481 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:15:18,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:15:18,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:15:18,482 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 9 states. [2018-10-24 12:15:18,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:18,599 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2018-10-24 12:15:18,600 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:15:18,600 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2018-10-24 12:15:18,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:18,602 INFO L225 Difference]: With dead ends: 37 [2018-10-24 12:15:18,603 INFO L226 Difference]: Without dead ends: 35 [2018-10-24 12:15:18,603 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:15:18,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-10-24 12:15:18,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2018-10-24 12:15:18,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-24 12:15:18,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-10-24 12:15:18,614 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 19 [2018-10-24 12:15:18,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:18,614 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-10-24 12:15:18,615 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:15:18,615 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-10-24 12:15:18,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-24 12:15:18,616 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:18,616 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:18,616 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:18,616 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:18,617 INFO L82 PathProgramCache]: Analyzing trace with hash 214509359, now seen corresponding path program 1 times [2018-10-24 12:15:18,617 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:18,618 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:18,618 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:15:18,618 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:18,618 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:18,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:19,049 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:19,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:19,050 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:19,050 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 28 with the following transitions: [2018-10-24 12:15:19,050 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [16], [18], [22], [26], [32], [34], [40], [43], [45], [48], [50], [51], [52], [53], [55], [56] [2018-10-24 12:15:19,052 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:15:19,052 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:15:19,072 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:15:19,556 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:15:19,557 INFO L272 AbstractInterpreter]: Visited 20 different actions 237 times. Merged at 8 different actions 101 times. Widened at 3 different actions 20 times. Found 11 fixpoints after 2 different actions. Largest state had 8 variables. [2018-10-24 12:15:19,593 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:19,593 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:15:19,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:19,594 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:19,607 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:19,608 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:15:19,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:19,628 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:19,974 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:19,975 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:20,473 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:20,494 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:20,495 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 25 [2018-10-24 12:15:20,495 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:20,495 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:15:20,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:15:20,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=508, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:15:20,496 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 18 states. [2018-10-24 12:15:20,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:20,886 INFO L93 Difference]: Finished difference Result 55 states and 58 transitions. [2018-10-24 12:15:20,892 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:15:20,892 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 27 [2018-10-24 12:15:20,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:20,895 INFO L225 Difference]: With dead ends: 55 [2018-10-24 12:15:20,895 INFO L226 Difference]: Without dead ends: 32 [2018-10-24 12:15:20,896 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 38 SyntacticMatches, 6 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=146, Invalid=784, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:15:20,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-24 12:15:20,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-24 12:15:20,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-24 12:15:20,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2018-10-24 12:15:20,902 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 27 [2018-10-24 12:15:20,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:20,903 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2018-10-24 12:15:20,903 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:15:20,903 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2018-10-24 12:15:20,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-24 12:15:20,904 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:20,904 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:20,905 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:20,905 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:20,905 INFO L82 PathProgramCache]: Analyzing trace with hash 1884298793, now seen corresponding path program 2 times [2018-10-24 12:15:20,905 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:20,906 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:20,906 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:20,906 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:20,907 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:20,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:21,110 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:21,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:21,110 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:21,111 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:21,111 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:21,111 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:21,111 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:21,119 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:15:21,119 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:15:21,137 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 12:15:21,137 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:15:21,141 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:21,260 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:21,261 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:21,439 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:15:21,459 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:21,459 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 20 [2018-10-24 12:15:21,459 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:21,460 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:15:21,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:15:21,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:15:21,461 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand 15 states. [2018-10-24 12:15:21,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:21,727 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2018-10-24 12:15:21,727 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:15:21,728 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 29 [2018-10-24 12:15:21,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:21,729 INFO L225 Difference]: With dead ends: 47 [2018-10-24 12:15:21,729 INFO L226 Difference]: Without dead ends: 45 [2018-10-24 12:15:21,729 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 46 SyntacticMatches, 5 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=532, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:15:21,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-24 12:15:21,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 40. [2018-10-24 12:15:21,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-24 12:15:21,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2018-10-24 12:15:21,736 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 29 [2018-10-24 12:15:21,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:21,737 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2018-10-24 12:15:21,737 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:15:21,737 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2018-10-24 12:15:21,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-24 12:15:21,738 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:21,738 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:21,738 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:21,738 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:21,739 INFO L82 PathProgramCache]: Analyzing trace with hash 2099085676, now seen corresponding path program 3 times [2018-10-24 12:15:21,739 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:21,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:21,739 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:15:21,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:21,740 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:21,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:22,072 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 7 proven. 22 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-24 12:15:22,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:22,073 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:22,073 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:22,073 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:22,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:22,073 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:22,081 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:15:22,081 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:15:22,096 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:15:22,096 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:15:22,100 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:22,484 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-24 12:15:22,485 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:23,335 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-24 12:15:23,356 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:23,356 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 31 [2018-10-24 12:15:23,357 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:23,358 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:15:23,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:15:23,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:15:23,359 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 22 states. [2018-10-24 12:15:23,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:23,946 INFO L93 Difference]: Finished difference Result 79 states and 84 transitions. [2018-10-24 12:15:23,946 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:15:23,947 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 37 [2018-10-24 12:15:23,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:23,948 INFO L225 Difference]: With dead ends: 79 [2018-10-24 12:15:23,948 INFO L226 Difference]: Without dead ends: 52 [2018-10-24 12:15:23,952 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 54 SyntacticMatches, 6 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=205, Invalid=1201, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:15:23,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-24 12:15:23,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 42. [2018-10-24 12:15:23,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-24 12:15:23,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-10-24 12:15:23,959 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 37 [2018-10-24 12:15:23,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:23,959 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-10-24 12:15:23,959 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:15:23,959 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-10-24 12:15:23,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-24 12:15:23,960 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:23,960 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:23,960 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:23,961 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:23,961 INFO L82 PathProgramCache]: Analyzing trace with hash -599816218, now seen corresponding path program 4 times [2018-10-24 12:15:23,961 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:23,962 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:23,962 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:15:23,962 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:23,962 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:23,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:24,104 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 15 proven. 22 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-24 12:15:24,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:24,105 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:24,105 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:24,105 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:24,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:24,105 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:24,113 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:24,114 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:15:24,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:24,144 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:24,287 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:15:24,287 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:24,398 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:15:24,418 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:24,418 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 22 [2018-10-24 12:15:24,418 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:24,419 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:15:24,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:15:24,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:15:24,419 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 18 states. [2018-10-24 12:15:24,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:24,735 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2018-10-24 12:15:24,735 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:15:24,735 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 39 [2018-10-24 12:15:24,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:24,737 INFO L225 Difference]: With dead ends: 57 [2018-10-24 12:15:24,737 INFO L226 Difference]: Without dead ends: 55 [2018-10-24 12:15:24,738 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 67 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=164, Invalid=706, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:15:24,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-24 12:15:24,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 50. [2018-10-24 12:15:24,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-24 12:15:24,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2018-10-24 12:15:24,745 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 39 [2018-10-24 12:15:24,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:24,746 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2018-10-24 12:15:24,746 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:15:24,746 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2018-10-24 12:15:24,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-24 12:15:24,747 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:24,747 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:24,747 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:24,747 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:24,748 INFO L82 PathProgramCache]: Analyzing trace with hash 303685161, now seen corresponding path program 5 times [2018-10-24 12:15:24,748 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:24,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:24,749 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:24,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:24,749 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:24,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:25,109 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 17 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-24 12:15:25,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:25,110 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:25,110 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:25,110 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:25,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:25,110 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:25,124 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:15:25,124 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:15:25,212 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-24 12:15:25,212 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:15:25,217 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:25,716 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 11 proven. 42 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-24 12:15:25,716 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:26,246 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 11 proven. 42 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-24 12:15:26,267 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:26,267 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 16] total 39 [2018-10-24 12:15:26,267 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:26,267 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:15:26,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:15:26,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1311, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:15:26,269 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand 28 states. [2018-10-24 12:15:27,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:27,224 INFO L93 Difference]: Finished difference Result 79 states and 85 transitions. [2018-10-24 12:15:27,224 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:15:27,224 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 47 [2018-10-24 12:15:27,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:27,226 INFO L225 Difference]: With dead ends: 79 [2018-10-24 12:15:27,226 INFO L226 Difference]: Without dead ends: 52 [2018-10-24 12:15:27,228 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 69 SyntacticMatches, 5 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 608 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=324, Invalid=2538, Unknown=0, NotChecked=0, Total=2862 [2018-10-24 12:15:27,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-24 12:15:27,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-10-24 12:15:27,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-24 12:15:27,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2018-10-24 12:15:27,235 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 47 [2018-10-24 12:15:27,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:27,235 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2018-10-24 12:15:27,236 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:15:27,236 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2018-10-24 12:15:27,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 12:15:27,237 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:27,237 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:27,237 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:27,237 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:27,237 INFO L82 PathProgramCache]: Analyzing trace with hash -1075211229, now seen corresponding path program 6 times [2018-10-24 12:15:27,238 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:27,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:27,238 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:15:27,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:27,239 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:27,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:27,407 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 25 proven. 38 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-24 12:15:27,407 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:27,407 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:27,407 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:27,407 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:27,408 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:27,408 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:27,418 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:15:27,418 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:15:27,434 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:15:27,434 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:15:27,438 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:27,639 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 5 proven. 58 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-24 12:15:27,639 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:27,835 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 5 proven. 58 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-24 12:15:27,858 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:27,858 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 15] total 28 [2018-10-24 12:15:27,858 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:27,859 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:15:27,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:15:27,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=636, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:15:27,860 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand 21 states. [2018-10-24 12:15:28,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:28,340 INFO L93 Difference]: Finished difference Result 67 states and 69 transitions. [2018-10-24 12:15:28,341 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:15:28,341 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2018-10-24 12:15:28,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:28,343 INFO L225 Difference]: With dead ends: 67 [2018-10-24 12:15:28,343 INFO L226 Difference]: Without dead ends: 65 [2018-10-24 12:15:28,344 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 80 SyntacticMatches, 7 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=245, Invalid=1161, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:15:28,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-10-24 12:15:28,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 60. [2018-10-24 12:15:28,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-24 12:15:28,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-10-24 12:15:28,353 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 49 [2018-10-24 12:15:28,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:28,353 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-10-24 12:15:28,353 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:15:28,353 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-10-24 12:15:28,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-24 12:15:28,354 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:28,355 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:28,355 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:28,355 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:28,355 INFO L82 PathProgramCache]: Analyzing trace with hash 893803878, now seen corresponding path program 7 times [2018-10-24 12:15:28,355 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:28,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:28,356 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:15:28,357 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:28,357 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:28,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:28,863 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 31 proven. 52 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:15:28,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:28,863 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:28,863 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:28,864 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:28,864 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:28,864 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:28,872 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:28,873 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:15:28,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:28,906 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:29,451 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 7 proven. 76 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:15:29,451 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:30,247 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 7 proven. 76 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:15:30,267 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:30,268 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 43 [2018-10-24 12:15:30,268 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:30,268 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:15:30,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:15:30,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=1564, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:15:30,270 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 30 states. [2018-10-24 12:15:31,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:31,315 INFO L93 Difference]: Finished difference Result 115 states and 120 transitions. [2018-10-24 12:15:31,315 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:15:31,315 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 57 [2018-10-24 12:15:31,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:31,318 INFO L225 Difference]: With dead ends: 115 [2018-10-24 12:15:31,318 INFO L226 Difference]: Without dead ends: 72 [2018-10-24 12:15:31,320 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 86 SyntacticMatches, 6 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 701 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=362, Invalid=2290, Unknown=0, NotChecked=0, Total=2652 [2018-10-24 12:15:31,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-24 12:15:31,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 62. [2018-10-24 12:15:31,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-10-24 12:15:31,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2018-10-24 12:15:31,328 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 57 [2018-10-24 12:15:31,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:31,328 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2018-10-24 12:15:31,329 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:15:31,329 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2018-10-24 12:15:31,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:15:31,330 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:31,330 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:31,330 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:31,330 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:31,330 INFO L82 PathProgramCache]: Analyzing trace with hash 1175347936, now seen corresponding path program 8 times [2018-10-24 12:15:31,330 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:31,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:31,332 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:31,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:31,332 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:31,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:31,526 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 37 proven. 58 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:15:31,527 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:31,527 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:31,527 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:31,527 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:31,527 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:31,527 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:31,536 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:15:31,536 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:15:31,556 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-24 12:15:31,556 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:15:31,559 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:31,749 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:15:31,749 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:31,963 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:15:31,984 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:31,984 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 17] total 32 [2018-10-24 12:15:31,984 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:31,985 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:15:31,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:15:31,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=834, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:15:31,986 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand 24 states. [2018-10-24 12:15:32,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:32,482 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2018-10-24 12:15:32,483 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:15:32,483 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 59 [2018-10-24 12:15:32,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:32,485 INFO L225 Difference]: With dead ends: 77 [2018-10-24 12:15:32,485 INFO L226 Difference]: Without dead ends: 75 [2018-10-24 12:15:32,486 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 97 SyntacticMatches, 8 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=337, Invalid=1555, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:15:32,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-24 12:15:32,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 70. [2018-10-24 12:15:32,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-10-24 12:15:32,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2018-10-24 12:15:32,496 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 59 [2018-10-24 12:15:32,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:32,496 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2018-10-24 12:15:32,496 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:15:32,497 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2018-10-24 12:15:32,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-24 12:15:32,498 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:32,498 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:32,498 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:32,498 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:32,498 INFO L82 PathProgramCache]: Analyzing trace with hash -549249245, now seen corresponding path program 9 times [2018-10-24 12:15:32,499 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:32,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:32,499 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:15:32,500 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:32,500 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:32,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:33,901 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 49 proven. 70 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-24 12:15:33,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:33,901 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:33,901 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:33,901 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:33,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:33,902 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:33,909 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:15:33,909 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:15:33,953 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:15:33,953 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:15:33,955 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:34,415 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 21 proven. 98 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-24 12:15:34,415 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:35,290 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 21 proven. 98 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-24 12:15:35,310 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:35,310 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 49 [2018-10-24 12:15:35,310 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:35,311 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:15:35,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:15:35,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=2046, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:15:35,313 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand 34 states. [2018-10-24 12:15:36,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:36,532 INFO L93 Difference]: Finished difference Result 133 states and 138 transitions. [2018-10-24 12:15:36,533 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:15:36,533 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 67 [2018-10-24 12:15:36,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:36,535 INFO L225 Difference]: With dead ends: 133 [2018-10-24 12:15:36,535 INFO L226 Difference]: Without dead ends: 82 [2018-10-24 12:15:36,538 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 102 SyntacticMatches, 6 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 924 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=454, Invalid=2968, Unknown=0, NotChecked=0, Total=3422 [2018-10-24 12:15:36,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-10-24 12:15:36,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 72. [2018-10-24 12:15:36,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-24 12:15:36,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2018-10-24 12:15:36,546 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 67 [2018-10-24 12:15:36,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:36,546 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2018-10-24 12:15:36,546 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:15:36,546 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2018-10-24 12:15:36,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-24 12:15:36,548 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:36,548 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:36,548 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:36,548 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:36,548 INFO L82 PathProgramCache]: Analyzing trace with hash 42341405, now seen corresponding path program 10 times [2018-10-24 12:15:36,549 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:36,549 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:36,550 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:15:36,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:36,550 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:36,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:36,967 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 51 proven. 82 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-24 12:15:36,967 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:36,968 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:36,968 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:36,968 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:36,968 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:36,968 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:36,976 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:36,976 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:15:37,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:37,003 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:38,305 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 10 proven. 111 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:15:38,305 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:38,919 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 10 proven. 111 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:15:38,939 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:38,939 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 34 [2018-10-24 12:15:38,939 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:38,940 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:15:38,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:15:38,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=935, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:15:38,941 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 27 states. [2018-10-24 12:15:39,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:39,426 INFO L93 Difference]: Finished difference Result 87 states and 89 transitions. [2018-10-24 12:15:39,426 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:15:39,426 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 69 [2018-10-24 12:15:39,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:39,428 INFO L225 Difference]: With dead ends: 87 [2018-10-24 12:15:39,428 INFO L226 Difference]: Without dead ends: 85 [2018-10-24 12:15:39,430 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 118 SyntacticMatches, 7 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 646 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=413, Invalid=1843, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:15:39,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-24 12:15:39,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 80. [2018-10-24 12:15:39,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-10-24 12:15:39,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2018-10-24 12:15:39,437 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 69 [2018-10-24 12:15:39,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:39,437 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2018-10-24 12:15:39,437 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:15:39,437 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2018-10-24 12:15:39,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-24 12:15:39,439 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:39,439 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:39,439 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:39,439 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:39,439 INFO L82 PathProgramCache]: Analyzing trace with hash -641186976, now seen corresponding path program 11 times [2018-10-24 12:15:39,440 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:39,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:39,440 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:39,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:39,441 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:39,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:40,083 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 71 proven. 90 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-24 12:15:40,083 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:40,083 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:40,084 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:40,084 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:40,084 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:40,084 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:40,100 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:15:40,100 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:15:40,199 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-24 12:15:40,199 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:15:40,202 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:40,816 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 26 proven. 135 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-24 12:15:40,816 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:41,560 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 26 proven. 135 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-24 12:15:41,580 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:41,580 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 22] total 56 [2018-10-24 12:15:41,580 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:41,581 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:15:41,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:15:41,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=2700, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:15:41,582 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand 39 states. [2018-10-24 12:15:42,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:42,486 INFO L93 Difference]: Finished difference Result 121 states and 130 transitions. [2018-10-24 12:15:42,486 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:15:42,486 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 77 [2018-10-24 12:15:42,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:42,488 INFO L225 Difference]: With dead ends: 121 [2018-10-24 12:15:42,488 INFO L226 Difference]: Without dead ends: 82 [2018-10-24 12:15:42,491 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 118 SyntacticMatches, 5 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1536 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=553, Invalid=4003, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:15:42,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-10-24 12:15:42,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2018-10-24 12:15:42,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-10-24 12:15:42,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2018-10-24 12:15:42,498 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 77 [2018-10-24 12:15:42,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:42,499 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2018-10-24 12:15:42,499 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:15:42,499 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2018-10-24 12:15:42,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-24 12:15:42,500 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:42,500 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:42,500 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:42,500 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:42,500 INFO L82 PathProgramCache]: Analyzing trace with hash -1270822950, now seen corresponding path program 12 times [2018-10-24 12:15:42,501 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:42,501 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:42,501 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:15:42,501 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:42,502 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:42,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:42,919 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 67 proven. 110 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-24 12:15:42,920 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:42,920 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:42,920 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:42,920 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:42,920 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:42,920 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:42,932 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:15:42,933 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:15:42,957 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:15:42,958 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:15:42,961 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:43,340 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 11 proven. 166 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-24 12:15:43,341 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:43,860 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 11 proven. 166 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-24 12:15:43,881 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:43,881 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 21] total 40 [2018-10-24 12:15:43,881 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:43,882 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:15:43,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:15:43,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=1320, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:15:43,883 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand 30 states. [2018-10-24 12:15:44,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:44,496 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2018-10-24 12:15:44,496 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 12:15:44,496 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 79 [2018-10-24 12:15:44,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:44,498 INFO L225 Difference]: With dead ends: 97 [2018-10-24 12:15:44,498 INFO L226 Difference]: Without dead ends: 95 [2018-10-24 12:15:44,500 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 131 SyntacticMatches, 10 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 948 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=533, Invalid=2547, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:15:44,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-10-24 12:15:44,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 90. [2018-10-24 12:15:44,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-24 12:15:44,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2018-10-24 12:15:44,507 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 79 [2018-10-24 12:15:44,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:44,507 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2018-10-24 12:15:44,507 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:15:44,507 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2018-10-24 12:15:44,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-10-24 12:15:44,508 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:44,508 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:44,509 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:44,509 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:44,509 INFO L82 PathProgramCache]: Analyzing trace with hash -2119833059, now seen corresponding path program 13 times [2018-10-24 12:15:44,509 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:44,510 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:44,510 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:15:44,510 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:44,510 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:44,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:45,163 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 97 proven. 112 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-24 12:15:45,164 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:45,164 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:45,164 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:45,164 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:45,164 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:45,164 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:45,173 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:45,173 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:15:45,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:45,200 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:45,800 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 13 proven. 196 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-24 12:15:45,801 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:46,849 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 13 proven. 196 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-24 12:15:46,870 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:46,870 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 61 [2018-10-24 12:15:46,870 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:46,870 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:15:46,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:15:46,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=473, Invalid=3187, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:15:46,872 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand 42 states. [2018-10-24 12:15:48,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:48,021 INFO L93 Difference]: Finished difference Result 169 states and 174 transitions. [2018-10-24 12:15:48,021 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:15:48,021 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 87 [2018-10-24 12:15:48,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:48,023 INFO L225 Difference]: With dead ends: 169 [2018-10-24 12:15:48,024 INFO L226 Difference]: Without dead ends: 102 [2018-10-24 12:15:48,026 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 134 SyntacticMatches, 6 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1472 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=686, Invalid=4570, Unknown=0, NotChecked=0, Total=5256 [2018-10-24 12:15:48,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-10-24 12:15:48,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 92. [2018-10-24 12:15:48,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-10-24 12:15:48,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 93 transitions. [2018-10-24 12:15:48,033 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 93 transitions. Word has length 87 [2018-10-24 12:15:48,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:48,033 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 93 transitions. [2018-10-24 12:15:48,033 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:15:48,033 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 93 transitions. [2018-10-24 12:15:48,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:15:48,034 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:48,034 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:48,035 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:48,035 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:48,035 INFO L82 PathProgramCache]: Analyzing trace with hash -2025415145, now seen corresponding path program 14 times [2018-10-24 12:15:48,035 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:48,036 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:48,036 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:48,036 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:48,036 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:48,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:48,283 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 85 proven. 142 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-24 12:15:48,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:48,284 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:48,284 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:48,284 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:48,284 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:48,284 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:48,291 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:15:48,291 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:15:48,330 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 12:15:48,330 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:15:48,332 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:48,726 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 31 proven. 196 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-24 12:15:48,727 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:49,083 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 31 proven. 196 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-24 12:15:49,104 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:49,104 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 23] total 44 [2018-10-24 12:15:49,104 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:49,105 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:15:49,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:15:49,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=296, Invalid=1596, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:15:49,106 INFO L87 Difference]: Start difference. First operand 92 states and 93 transitions. Second operand 33 states. [2018-10-24 12:15:49,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:49,856 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2018-10-24 12:15:49,857 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:15:49,857 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 89 [2018-10-24 12:15:49,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:49,858 INFO L225 Difference]: With dead ends: 107 [2018-10-24 12:15:49,859 INFO L226 Difference]: Without dead ends: 105 [2018-10-24 12:15:49,860 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 148 SyntacticMatches, 11 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1184 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=673, Invalid=3109, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:15:49,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-24 12:15:49,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 100. [2018-10-24 12:15:49,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-10-24 12:15:49,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2018-10-24 12:15:49,867 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 89 [2018-10-24 12:15:49,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:49,867 INFO L481 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2018-10-24 12:15:49,867 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:15:49,867 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2018-10-24 12:15:49,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-10-24 12:15:49,868 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:49,869 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:49,869 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:49,869 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:49,869 INFO L82 PathProgramCache]: Analyzing trace with hash 147075930, now seen corresponding path program 15 times [2018-10-24 12:15:49,869 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:49,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:49,870 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:15:49,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:49,870 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:49,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:50,535 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 127 proven. 136 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-24 12:15:50,535 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:50,535 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:50,535 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:50,535 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:50,536 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:50,536 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:50,543 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:15:50,543 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:15:50,575 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:15:50,575 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:15:50,579 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:51,338 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 36 proven. 227 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-24 12:15:51,338 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:52,532 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 36 proven. 227 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-24 12:15:52,554 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:52,554 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 67 [2018-10-24 12:15:52,554 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:52,554 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-24 12:15:52,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-24 12:15:52,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=3861, Unknown=0, NotChecked=0, Total=4422 [2018-10-24 12:15:52,557 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand 46 states. [2018-10-24 12:15:54,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:54,089 INFO L93 Difference]: Finished difference Result 187 states and 192 transitions. [2018-10-24 12:15:54,094 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:15:54,095 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 97 [2018-10-24 12:15:54,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:54,096 INFO L225 Difference]: With dead ends: 187 [2018-10-24 12:15:54,096 INFO L226 Difference]: Without dead ends: 112 [2018-10-24 12:15:54,097 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 150 SyntacticMatches, 6 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1779 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=811, Invalid=5509, Unknown=0, NotChecked=0, Total=6320 [2018-10-24 12:15:54,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-10-24 12:15:54,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 102. [2018-10-24 12:15:54,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-24 12:15:54,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 103 transitions. [2018-10-24 12:15:54,105 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 103 transitions. Word has length 97 [2018-10-24 12:15:54,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:54,105 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 103 transitions. [2018-10-24 12:15:54,105 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-24 12:15:54,105 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 103 transitions. [2018-10-24 12:15:54,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:15:54,108 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:54,108 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:54,108 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:54,108 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:54,108 INFO L82 PathProgramCache]: Analyzing trace with hash -692603180, now seen corresponding path program 16 times [2018-10-24 12:15:54,108 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:54,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:54,109 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:15:54,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:54,109 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:54,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:54,493 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 105 proven. 178 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-24 12:15:54,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:54,493 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:54,493 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:54,493 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:54,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:54,494 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:54,501 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:54,501 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:15:54,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:54,533 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:54,841 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 16 proven. 246 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:15:54,841 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:55,822 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 16 proven. 246 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:15:55,843 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:55,844 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 46 [2018-10-24 12:15:55,844 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:55,844 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:15:55,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:15:55,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=1733, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:15:55,846 INFO L87 Difference]: Start difference. First operand 102 states and 103 transitions. Second operand 36 states. [2018-10-24 12:15:56,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:56,694 INFO L93 Difference]: Finished difference Result 117 states and 119 transitions. [2018-10-24 12:15:56,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:15:56,695 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 99 [2018-10-24 12:15:56,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:56,697 INFO L225 Difference]: With dead ends: 117 [2018-10-24 12:15:56,697 INFO L226 Difference]: Without dead ends: 115 [2018-10-24 12:15:56,698 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 169 SyntacticMatches, 10 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1315 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=779, Invalid=3511, Unknown=0, NotChecked=0, Total=4290 [2018-10-24 12:15:56,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-24 12:15:56,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 110. [2018-10-24 12:15:56,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-10-24 12:15:56,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 111 transitions. [2018-10-24 12:15:56,705 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 111 transitions. Word has length 99 [2018-10-24 12:15:56,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:56,705 INFO L481 AbstractCegarLoop]: Abstraction has 110 states and 111 transitions. [2018-10-24 12:15:56,705 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:15:56,705 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 111 transitions. [2018-10-24 12:15:56,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-10-24 12:15:56,706 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:56,707 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:56,707 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:56,707 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:56,707 INFO L82 PathProgramCache]: Analyzing trace with hash 941834007, now seen corresponding path program 17 times [2018-10-24 12:15:56,707 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:56,708 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:56,708 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:56,708 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:56,708 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:56,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:57,762 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 161 proven. 162 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-24 12:15:57,762 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:57,762 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:57,762 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:57,762 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:57,762 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:57,763 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:15:57,771 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:15:57,771 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:15:57,813 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-24 12:15:57,813 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:15:57,816 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:58,514 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 41 proven. 282 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-24 12:15:58,514 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:59,915 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 41 proven. 282 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-24 12:15:59,936 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:59,936 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29, 28] total 74 [2018-10-24 12:15:59,936 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:59,936 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-24 12:15:59,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-24 12:15:59,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=4734, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:15:59,938 INFO L87 Difference]: Start difference. First operand 110 states and 111 transitions. Second operand 51 states. [2018-10-24 12:16:01,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:01,624 INFO L93 Difference]: Finished difference Result 163 states and 175 transitions. [2018-10-24 12:16:01,625 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-24 12:16:01,625 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 107 [2018-10-24 12:16:01,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:01,627 INFO L225 Difference]: With dead ends: 163 [2018-10-24 12:16:01,627 INFO L226 Difference]: Without dead ends: 112 [2018-10-24 12:16:01,629 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 166 SyntacticMatches, 5 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2895 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=931, Invalid=6901, Unknown=0, NotChecked=0, Total=7832 [2018-10-24 12:16:01,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-10-24 12:16:01,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2018-10-24 12:16:01,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-10-24 12:16:01,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2018-10-24 12:16:01,637 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 107 [2018-10-24 12:16:01,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:01,638 INFO L481 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2018-10-24 12:16:01,638 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-24 12:16:01,638 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2018-10-24 12:16:01,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:16:01,639 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:01,639 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:01,639 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:01,639 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:01,640 INFO L82 PathProgramCache]: Analyzing trace with hash 1858875921, now seen corresponding path program 18 times [2018-10-24 12:16:01,640 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:01,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:01,641 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:01,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:01,641 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:01,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:02,702 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 127 proven. 218 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-24 12:16:02,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:02,702 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:02,703 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:02,703 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:02,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:02,703 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:02,711 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:02,711 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:02,748 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:02,748 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:02,752 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:03,126 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 17 proven. 328 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-24 12:16:03,126 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:03,582 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 17 proven. 328 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-24 12:16:03,602 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:03,602 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 27, 27] total 52 [2018-10-24 12:16:03,602 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:03,603 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:16:03,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:16:03,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=405, Invalid=2247, Unknown=0, NotChecked=0, Total=2652 [2018-10-24 12:16:03,604 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand 39 states. [2018-10-24 12:16:04,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:04,712 INFO L93 Difference]: Finished difference Result 127 states and 129 transitions. [2018-10-24 12:16:04,714 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-24 12:16:04,714 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 109 [2018-10-24 12:16:04,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:04,716 INFO L225 Difference]: With dead ends: 127 [2018-10-24 12:16:04,716 INFO L226 Difference]: Without dead ends: 125 [2018-10-24 12:16:04,717 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 182 SyntacticMatches, 13 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1737 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=938, Invalid=4464, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:16:04,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2018-10-24 12:16:04,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 120. [2018-10-24 12:16:04,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-10-24 12:16:04,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 121 transitions. [2018-10-24 12:16:04,723 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 121 transitions. Word has length 109 [2018-10-24 12:16:04,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:04,724 INFO L481 AbstractCegarLoop]: Abstraction has 120 states and 121 transitions. [2018-10-24 12:16:04,724 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:16:04,724 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 121 transitions. [2018-10-24 12:16:04,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-10-24 12:16:04,725 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:04,725 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:04,725 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:04,725 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:04,725 INFO L82 PathProgramCache]: Analyzing trace with hash -1311036076, now seen corresponding path program 19 times [2018-10-24 12:16:04,725 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:04,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:04,726 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:04,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:04,726 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:04,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:05,546 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 199 proven. 190 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-24 12:16:05,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:05,546 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:05,547 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:05,547 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:05,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:05,547 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:05,554 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:05,554 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:05,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:05,591 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:06,544 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 19 proven. 370 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-24 12:16:06,545 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:08,341 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 19 proven. 370 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-24 12:16:08,361 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:08,361 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 79 [2018-10-24 12:16:08,362 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:08,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-24 12:16:08,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-24 12:16:08,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=785, Invalid=5377, Unknown=0, NotChecked=0, Total=6162 [2018-10-24 12:16:08,364 INFO L87 Difference]: Start difference. First operand 120 states and 121 transitions. Second operand 54 states. [2018-10-24 12:16:11,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:11,071 INFO L93 Difference]: Finished difference Result 223 states and 228 transitions. [2018-10-24 12:16:11,071 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-24 12:16:11,071 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 117 [2018-10-24 12:16:11,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:11,072 INFO L225 Difference]: With dead ends: 223 [2018-10-24 12:16:11,072 INFO L226 Difference]: Without dead ends: 132 [2018-10-24 12:16:11,074 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 182 SyntacticMatches, 6 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2513 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=1118, Invalid=7624, Unknown=0, NotChecked=0, Total=8742 [2018-10-24 12:16:11,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-10-24 12:16:11,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 122. [2018-10-24 12:16:11,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-10-24 12:16:11,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 123 transitions. [2018-10-24 12:16:11,084 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 123 transitions. Word has length 117 [2018-10-24 12:16:11,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:11,084 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 123 transitions. [2018-10-24 12:16:11,084 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-24 12:16:11,085 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 123 transitions. [2018-10-24 12:16:11,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:16:11,085 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:11,085 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 11, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:11,086 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:11,086 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:11,086 INFO L82 PathProgramCache]: Analyzing trace with hash 1322528718, now seen corresponding path program 20 times [2018-10-24 12:16:11,086 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:11,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:11,087 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:11,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:11,087 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:11,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:11,408 INFO L134 CoverageAnalysis]: Checked inductivity of 566 backedges. 151 proven. 262 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-24 12:16:11,408 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:11,408 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:11,408 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:11,408 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:11,408 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:11,408 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:11,419 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:11,419 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:11,463 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-10-24 12:16:11,464 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:11,467 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:12,143 INFO L134 CoverageAnalysis]: Checked inductivity of 566 backedges. 46 proven. 367 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-24 12:16:12,143 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:12,687 INFO L134 CoverageAnalysis]: Checked inductivity of 566 backedges. 46 proven. 367 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-24 12:16:12,708 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:12,708 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29, 29] total 56 [2018-10-24 12:16:12,708 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:12,708 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:16:12,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:16:12,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=479, Invalid=2601, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:16:12,710 INFO L87 Difference]: Start difference. First operand 122 states and 123 transitions. Second operand 42 states. [2018-10-24 12:16:13,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:13,845 INFO L93 Difference]: Finished difference Result 137 states and 139 transitions. [2018-10-24 12:16:13,846 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:16:13,846 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 119 [2018-10-24 12:16:13,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:13,847 INFO L225 Difference]: With dead ends: 137 [2018-10-24 12:16:13,848 INFO L226 Difference]: Without dead ends: 135 [2018-10-24 12:16:13,849 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 199 SyntacticMatches, 14 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2051 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1126, Invalid=5194, Unknown=0, NotChecked=0, Total=6320 [2018-10-24 12:16:13,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-10-24 12:16:13,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 130. [2018-10-24 12:16:13,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-10-24 12:16:13,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2018-10-24 12:16:13,861 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 119 [2018-10-24 12:16:13,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:13,861 INFO L481 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2018-10-24 12:16:13,861 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:16:13,861 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2018-10-24 12:16:13,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-10-24 12:16:13,862 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:13,862 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:13,863 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:13,863 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:13,863 INFO L82 PathProgramCache]: Analyzing trace with hash -1290002927, now seen corresponding path program 21 times [2018-10-24 12:16:13,863 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:13,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:13,864 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:13,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:13,864 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:13,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:14,901 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 241 proven. 220 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-24 12:16:14,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:14,902 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:14,902 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:14,902 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:14,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:14,902 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:14,910 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:14,910 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:14,945 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:14,945 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:14,950 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:16,053 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 51 proven. 410 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-24 12:16:16,054 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:18,353 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 51 proven. 410 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-24 12:16:18,373 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:18,373 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 85 [2018-10-24 12:16:18,374 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:18,374 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-10-24 12:16:18,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-10-24 12:16:18,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=897, Invalid=6243, Unknown=0, NotChecked=0, Total=7140 [2018-10-24 12:16:18,375 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand 58 states. [2018-10-24 12:16:20,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:20,693 INFO L93 Difference]: Finished difference Result 241 states and 246 transitions. [2018-10-24 12:16:20,694 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:16:20,694 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 127 [2018-10-24 12:16:20,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:20,696 INFO L225 Difference]: With dead ends: 241 [2018-10-24 12:16:20,696 INFO L226 Difference]: Without dead ends: 142 [2018-10-24 12:16:20,698 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 198 SyntacticMatches, 6 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2904 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=1276, Invalid=8824, Unknown=0, NotChecked=0, Total=10100 [2018-10-24 12:16:20,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-10-24 12:16:20,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 132. [2018-10-24 12:16:20,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-10-24 12:16:20,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 133 transitions. [2018-10-24 12:16:20,707 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 133 transitions. Word has length 127 [2018-10-24 12:16:20,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:20,707 INFO L481 AbstractCegarLoop]: Abstraction has 132 states and 133 transitions. [2018-10-24 12:16:20,707 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-10-24 12:16:20,707 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 133 transitions. [2018-10-24 12:16:20,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:16:20,708 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:20,708 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 12, 12, 12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:20,709 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:20,709 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:20,709 INFO L82 PathProgramCache]: Analyzing trace with hash -348663797, now seen corresponding path program 22 times [2018-10-24 12:16:20,709 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:20,710 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:20,710 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:20,710 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:20,710 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:20,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:22,180 INFO L134 CoverageAnalysis]: Checked inductivity of 677 backedges. 177 proven. 310 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-24 12:16:22,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:22,180 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:22,180 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:22,180 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:22,181 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:22,181 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:22,189 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:22,189 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:22,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:22,233 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:22,661 INFO L134 CoverageAnalysis]: Checked inductivity of 677 backedges. 22 proven. 435 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:16:22,661 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:23,161 INFO L134 CoverageAnalysis]: Checked inductivity of 677 backedges. 22 proven. 435 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:16:23,182 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:23,182 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 58 [2018-10-24 12:16:23,182 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:23,183 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:16:23,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:16:23,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=532, Invalid=2774, Unknown=0, NotChecked=0, Total=3306 [2018-10-24 12:16:23,184 INFO L87 Difference]: Start difference. First operand 132 states and 133 transitions. Second operand 45 states. [2018-10-24 12:16:24,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:24,729 INFO L93 Difference]: Finished difference Result 147 states and 149 transitions. [2018-10-24 12:16:24,730 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:16:24,730 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 129 [2018-10-24 12:16:24,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:24,732 INFO L225 Difference]: With dead ends: 147 [2018-10-24 12:16:24,732 INFO L226 Difference]: Without dead ends: 145 [2018-10-24 12:16:24,733 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 220 SyntacticMatches, 13 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2218 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1262, Invalid=5710, Unknown=0, NotChecked=0, Total=6972 [2018-10-24 12:16:24,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-10-24 12:16:24,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 140. [2018-10-24 12:16:24,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2018-10-24 12:16:24,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 141 transitions. [2018-10-24 12:16:24,742 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 141 transitions. Word has length 129 [2018-10-24 12:16:24,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:24,742 INFO L481 AbstractCegarLoop]: Abstraction has 140 states and 141 transitions. [2018-10-24 12:16:24,742 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:16:24,742 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 141 transitions. [2018-10-24 12:16:24,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-10-24 12:16:24,743 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:24,743 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:24,744 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:24,744 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:24,744 INFO L82 PathProgramCache]: Analyzing trace with hash 1445867854, now seen corresponding path program 23 times [2018-10-24 12:16:24,744 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:24,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:24,745 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:24,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:24,745 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:24,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:25,872 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 287 proven. 252 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-24 12:16:25,872 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:25,872 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:25,872 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:25,872 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:25,873 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:25,873 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:25,880 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:25,881 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:25,933 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-10-24 12:16:25,933 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:25,936 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:26,732 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 56 proven. 483 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-24 12:16:26,733 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:28,347 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 56 proven. 483 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-24 12:16:28,368 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:28,368 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 35, 34] total 79 [2018-10-24 12:16:28,368 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:28,369 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-24 12:16:28,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-24 12:16:28,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=824, Invalid=5338, Unknown=0, NotChecked=0, Total=6162 [2018-10-24 12:16:28,370 INFO L87 Difference]: Start difference. First operand 140 states and 141 transitions. Second operand 50 states. [2018-10-24 12:16:29,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:29,605 INFO L93 Difference]: Finished difference Result 205 states and 220 transitions. [2018-10-24 12:16:29,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-24 12:16:29,605 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 137 [2018-10-24 12:16:29,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:29,607 INFO L225 Difference]: With dead ends: 205 [2018-10-24 12:16:29,607 INFO L226 Difference]: Without dead ends: 142 [2018-10-24 12:16:29,609 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 227 SyntacticMatches, 5 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2979 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=1136, Invalid=7794, Unknown=0, NotChecked=0, Total=8930 [2018-10-24 12:16:29,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-10-24 12:16:29,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2018-10-24 12:16:29,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-10-24 12:16:29,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2018-10-24 12:16:29,619 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 137 [2018-10-24 12:16:29,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:29,619 INFO L481 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2018-10-24 12:16:29,619 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-24 12:16:29,620 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2018-10-24 12:16:29,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2018-10-24 12:16:29,620 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:29,621 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 13, 13, 13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:29,621 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:29,621 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:29,621 INFO L82 PathProgramCache]: Analyzing trace with hash -277400888, now seen corresponding path program 24 times [2018-10-24 12:16:29,621 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:29,622 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:29,622 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:29,622 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:29,622 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:29,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:30,151 INFO L134 CoverageAnalysis]: Checked inductivity of 798 backedges. 205 proven. 362 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-24 12:16:30,152 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:30,152 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:30,152 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:30,152 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:30,152 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:30,152 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:30,159 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:30,159 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:30,200 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:30,201 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:30,204 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:30,684 INFO L134 CoverageAnalysis]: Checked inductivity of 798 backedges. 23 proven. 544 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-24 12:16:30,685 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:31,337 INFO L134 CoverageAnalysis]: Checked inductivity of 798 backedges. 23 proven. 544 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-24 12:16:31,358 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:31,358 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 33, 33] total 64 [2018-10-24 12:16:31,358 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:31,359 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-24 12:16:31,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-24 12:16:31,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=615, Invalid=3417, Unknown=0, NotChecked=0, Total=4032 [2018-10-24 12:16:31,360 INFO L87 Difference]: Start difference. First operand 142 states and 143 transitions. Second operand 48 states. [2018-10-24 12:16:33,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:33,106 INFO L93 Difference]: Finished difference Result 157 states and 159 transitions. [2018-10-24 12:16:33,106 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-24 12:16:33,107 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 139 [2018-10-24 12:16:33,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:33,109 INFO L225 Difference]: With dead ends: 157 [2018-10-24 12:16:33,109 INFO L226 Difference]: Without dead ends: 155 [2018-10-24 12:16:33,110 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 233 SyntacticMatches, 16 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2760 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1460, Invalid=6912, Unknown=0, NotChecked=0, Total=8372 [2018-10-24 12:16:33,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2018-10-24 12:16:33,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 150. [2018-10-24 12:16:33,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-10-24 12:16:33,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 151 transitions. [2018-10-24 12:16:33,120 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 151 transitions. Word has length 139 [2018-10-24 12:16:33,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:33,121 INFO L481 AbstractCegarLoop]: Abstraction has 150 states and 151 transitions. [2018-10-24 12:16:33,121 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-24 12:16:33,121 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 151 transitions. [2018-10-24 12:16:33,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-10-24 12:16:33,122 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:33,122 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:33,122 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:33,122 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:33,123 INFO L82 PathProgramCache]: Analyzing trace with hash 1416726283, now seen corresponding path program 25 times [2018-10-24 12:16:33,123 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:33,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:33,123 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:33,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:33,124 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:33,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:34,587 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 337 proven. 286 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-24 12:16:34,587 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:34,587 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:34,587 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:34,587 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:34,587 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:34,588 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:34,595 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:34,595 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:34,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:34,650 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:36,182 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 25 proven. 598 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-24 12:16:36,182 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:38,401 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 25 proven. 598 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-24 12:16:38,422 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:38,422 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 97 [2018-10-24 12:16:38,422 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:38,422 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-10-24 12:16:38,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-10-24 12:16:38,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=8134, Unknown=0, NotChecked=0, Total=9312 [2018-10-24 12:16:38,423 INFO L87 Difference]: Start difference. First operand 150 states and 151 transitions. Second operand 66 states. [2018-10-24 12:16:41,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:41,428 INFO L93 Difference]: Finished difference Result 277 states and 282 transitions. [2018-10-24 12:16:41,428 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:16:41,429 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 147 [2018-10-24 12:16:41,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:41,431 INFO L225 Difference]: With dead ends: 277 [2018-10-24 12:16:41,431 INFO L226 Difference]: Without dead ends: 162 [2018-10-24 12:16:41,433 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 230 SyntacticMatches, 6 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3824 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=1658, Invalid=11452, Unknown=0, NotChecked=0, Total=13110 [2018-10-24 12:16:41,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2018-10-24 12:16:41,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 152. [2018-10-24 12:16:41,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2018-10-24 12:16:41,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 153 transitions. [2018-10-24 12:16:41,443 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 153 transitions. Word has length 147 [2018-10-24 12:16:41,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:41,444 INFO L481 AbstractCegarLoop]: Abstraction has 152 states and 153 transitions. [2018-10-24 12:16:41,444 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-10-24 12:16:41,444 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 153 transitions. [2018-10-24 12:16:41,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-10-24 12:16:41,445 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:41,445 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 14, 14, 14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:41,445 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:41,445 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:41,445 INFO L82 PathProgramCache]: Analyzing trace with hash -2144700411, now seen corresponding path program 26 times [2018-10-24 12:16:41,446 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:41,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:41,446 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:41,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:41,446 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:41,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:42,096 INFO L134 CoverageAnalysis]: Checked inductivity of 929 backedges. 235 proven. 418 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-24 12:16:42,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:42,097 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:42,097 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:42,097 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:42,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:42,097 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:42,107 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:16:42,108 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:16:42,163 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-24 12:16:42,164 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:42,167 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:42,783 INFO L134 CoverageAnalysis]: Checked inductivity of 929 backedges. 61 proven. 592 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-24 12:16:42,783 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:43,710 INFO L134 CoverageAnalysis]: Checked inductivity of 929 backedges. 61 proven. 592 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-24 12:16:43,731 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:43,731 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 35, 35] total 68 [2018-10-24 12:16:43,731 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:43,732 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-24 12:16:43,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-24 12:16:43,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=707, Invalid=3849, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:16:43,733 INFO L87 Difference]: Start difference. First operand 152 states and 153 transitions. Second operand 51 states. [2018-10-24 12:16:45,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:45,367 INFO L93 Difference]: Finished difference Result 167 states and 169 transitions. [2018-10-24 12:16:45,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-24 12:16:45,368 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 149 [2018-10-24 12:16:45,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:45,370 INFO L225 Difference]: With dead ends: 167 [2018-10-24 12:16:45,370 INFO L226 Difference]: Without dead ends: 165 [2018-10-24 12:16:45,371 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 250 SyntacticMatches, 17 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3152 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1696, Invalid=7810, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:16:45,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2018-10-24 12:16:45,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 160. [2018-10-24 12:16:45,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-10-24 12:16:45,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 161 transitions. [2018-10-24 12:16:45,383 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 161 transitions. Word has length 149 [2018-10-24 12:16:45,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:45,383 INFO L481 AbstractCegarLoop]: Abstraction has 160 states and 161 transitions. [2018-10-24 12:16:45,383 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-24 12:16:45,383 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 161 transitions. [2018-10-24 12:16:45,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2018-10-24 12:16:45,384 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:45,384 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:45,385 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:45,385 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:45,385 INFO L82 PathProgramCache]: Analyzing trace with hash 1214136136, now seen corresponding path program 27 times [2018-10-24 12:16:45,385 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:45,386 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:45,386 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:45,386 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:45,386 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:45,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:47,097 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 391 proven. 322 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-24 12:16:47,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:47,097 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:47,097 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:47,097 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:47,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:47,097 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:47,106 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:16:47,106 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:16:47,155 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:16:47,155 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:16:47,159 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:48,747 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 66 proven. 647 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-24 12:16:48,747 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:51,505 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 66 proven. 647 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-24 12:16:51,525 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:51,525 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 103 [2018-10-24 12:16:51,525 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:51,526 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-10-24 12:16:51,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-10-24 12:16:51,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1314, Invalid=9192, Unknown=0, NotChecked=0, Total=10506 [2018-10-24 12:16:51,527 INFO L87 Difference]: Start difference. First operand 160 states and 161 transitions. Second operand 70 states. [2018-10-24 12:16:55,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:55,881 INFO L93 Difference]: Finished difference Result 295 states and 300 transitions. [2018-10-24 12:16:55,882 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:16:55,882 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 157 [2018-10-24 12:16:55,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:55,884 INFO L225 Difference]: With dead ends: 295 [2018-10-24 12:16:55,884 INFO L226 Difference]: Without dead ends: 172 [2018-10-24 12:16:55,886 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 246 SyntacticMatches, 6 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4299 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=1849, Invalid=12913, Unknown=0, NotChecked=0, Total=14762 [2018-10-24 12:16:55,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-10-24 12:16:55,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 162. [2018-10-24 12:16:55,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-10-24 12:16:55,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 163 transitions. [2018-10-24 12:16:55,895 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 163 transitions. Word has length 157 [2018-10-24 12:16:55,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:55,896 INFO L481 AbstractCegarLoop]: Abstraction has 162 states and 163 transitions. [2018-10-24 12:16:55,896 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-10-24 12:16:55,896 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 163 transitions. [2018-10-24 12:16:55,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-10-24 12:16:55,897 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:55,897 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 15, 15, 15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:55,897 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:55,897 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:55,898 INFO L82 PathProgramCache]: Analyzing trace with hash -50217022, now seen corresponding path program 28 times [2018-10-24 12:16:55,898 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:55,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:55,898 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:55,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:55,899 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:55,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:56,466 INFO L134 CoverageAnalysis]: Checked inductivity of 1070 backedges. 267 proven. 478 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-24 12:16:56,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:56,466 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:56,466 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:56,467 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:56,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:56,467 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:16:56,480 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:56,480 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:56,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:56,550 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:57,144 INFO L134 CoverageAnalysis]: Checked inductivity of 1070 backedges. 28 proven. 678 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-24 12:16:57,145 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:16:57,898 INFO L134 CoverageAnalysis]: Checked inductivity of 1070 backedges. 28 proven. 678 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-24 12:16:57,918 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:57,919 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 70 [2018-10-24 12:16:57,919 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:57,919 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-24 12:16:57,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-24 12:16:57,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=772, Invalid=4058, Unknown=0, NotChecked=0, Total=4830 [2018-10-24 12:16:57,921 INFO L87 Difference]: Start difference. First operand 162 states and 163 transitions. Second operand 54 states. [2018-10-24 12:16:59,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:59,525 INFO L93 Difference]: Finished difference Result 177 states and 179 transitions. [2018-10-24 12:16:59,526 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-24 12:16:59,526 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 159 [2018-10-24 12:16:59,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:59,528 INFO L225 Difference]: With dead ends: 177 [2018-10-24 12:16:59,528 INFO L226 Difference]: Without dead ends: 175 [2018-10-24 12:16:59,530 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 387 GetRequests, 271 SyntacticMatches, 16 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3355 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1862, Invalid=8440, Unknown=0, NotChecked=0, Total=10302 [2018-10-24 12:16:59,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-10-24 12:16:59,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 170. [2018-10-24 12:16:59,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2018-10-24 12:16:59,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 171 transitions. [2018-10-24 12:16:59,541 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 171 transitions. Word has length 159 [2018-10-24 12:16:59,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:59,541 INFO L481 AbstractCegarLoop]: Abstraction has 170 states and 171 transitions. [2018-10-24 12:16:59,541 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-24 12:16:59,541 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 171 transitions. [2018-10-24 12:16:59,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-10-24 12:16:59,542 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:59,543 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:59,543 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:59,543 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:59,543 INFO L82 PathProgramCache]: Analyzing trace with hash 1870952965, now seen corresponding path program 29 times [2018-10-24 12:16:59,543 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:59,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:59,544 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:59,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:59,544 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:59,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:01,063 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 449 proven. 360 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-24 12:17:01,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:01,063 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:01,064 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:01,064 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:01,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:01,064 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:01,071 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:17:01,071 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:17:01,135 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2018-10-24 12:17:01,135 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:01,139 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:02,616 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 71 proven. 738 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-24 12:17:02,616 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:04,881 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 71 proven. 738 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-24 12:17:04,901 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:04,902 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 41, 40] total 110 [2018-10-24 12:17:04,902 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:04,902 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-10-24 12:17:04,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-10-24 12:17:04,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1514, Invalid=10476, Unknown=0, NotChecked=0, Total=11990 [2018-10-24 12:17:04,904 INFO L87 Difference]: Start difference. First operand 170 states and 171 transitions. Second operand 75 states. [2018-10-24 12:17:07,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:07,514 INFO L93 Difference]: Finished difference Result 247 states and 265 transitions. [2018-10-24 12:17:07,514 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-24 12:17:07,514 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 167 [2018-10-24 12:17:07,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:07,516 INFO L225 Difference]: With dead ends: 247 [2018-10-24 12:17:07,517 INFO L226 Difference]: Without dead ends: 172 [2018-10-24 12:17:07,520 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 262 SyntacticMatches, 5 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6855 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=2011, Invalid=15019, Unknown=0, NotChecked=0, Total=17030 [2018-10-24 12:17:07,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-10-24 12:17:07,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 172. [2018-10-24 12:17:07,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-10-24 12:17:07,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 173 transitions. [2018-10-24 12:17:07,533 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 173 transitions. Word has length 167 [2018-10-24 12:17:07,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:07,533 INFO L481 AbstractCegarLoop]: Abstraction has 172 states and 173 transitions. [2018-10-24 12:17:07,533 INFO L482 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-10-24 12:17:07,533 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 173 transitions. [2018-10-24 12:17:07,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2018-10-24 12:17:07,534 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:07,535 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 16, 16, 16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:07,535 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:07,535 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:07,535 INFO L82 PathProgramCache]: Analyzing trace with hash 1120217599, now seen corresponding path program 30 times [2018-10-24 12:17:07,535 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:07,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:07,536 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:07,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:07,536 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:07,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:08,527 INFO L134 CoverageAnalysis]: Checked inductivity of 1221 backedges. 301 proven. 542 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-24 12:17:08,528 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:08,528 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:08,528 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:08,528 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:08,528 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:08,528 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:08,535 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:17:08,535 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:17:08,582 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:17:08,582 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:08,587 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:10,505 INFO L134 CoverageAnalysis]: Checked inductivity of 1221 backedges. 29 proven. 814 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-24 12:17:10,506 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:11,474 INFO L134 CoverageAnalysis]: Checked inductivity of 1221 backedges. 29 proven. 814 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-24 12:17:11,494 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:11,495 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 39, 39] total 76 [2018-10-24 12:17:11,495 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:11,495 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-24 12:17:11,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-24 12:17:11,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=870, Invalid=4830, Unknown=0, NotChecked=0, Total=5700 [2018-10-24 12:17:11,497 INFO L87 Difference]: Start difference. First operand 172 states and 173 transitions. Second operand 57 states. [2018-10-24 12:17:13,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:13,336 INFO L93 Difference]: Finished difference Result 187 states and 189 transitions. [2018-10-24 12:17:13,337 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-24 12:17:13,337 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 169 [2018-10-24 12:17:13,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:13,339 INFO L225 Difference]: With dead ends: 187 [2018-10-24 12:17:13,339 INFO L226 Difference]: Without dead ends: 185 [2018-10-24 12:17:13,341 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 284 SyntacticMatches, 19 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4017 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=2099, Invalid=9891, Unknown=0, NotChecked=0, Total=11990 [2018-10-24 12:17:13,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2018-10-24 12:17:13,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 180. [2018-10-24 12:17:13,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-10-24 12:17:13,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 181 transitions. [2018-10-24 12:17:13,353 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 181 transitions. Word has length 169 [2018-10-24 12:17:13,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:13,353 INFO L481 AbstractCegarLoop]: Abstraction has 180 states and 181 transitions. [2018-10-24 12:17:13,353 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-24 12:17:13,353 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 181 transitions. [2018-10-24 12:17:13,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-10-24 12:17:13,355 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:13,355 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:13,355 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:13,355 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:13,355 INFO L82 PathProgramCache]: Analyzing trace with hash -326346942, now seen corresponding path program 31 times [2018-10-24 12:17:13,355 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:13,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:13,356 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:13,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:13,356 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:13,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:15,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 511 proven. 400 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-24 12:17:15,364 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:15,365 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:15,365 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:15,365 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:15,365 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:15,365 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:15,372 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:15,372 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:17:15,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:15,424 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:17,508 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 31 proven. 880 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-24 12:17:17,509 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:21,163 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 31 proven. 880 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-24 12:17:21,183 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:21,184 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 115 [2018-10-24 12:17:21,184 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:21,184 INFO L460 AbstractCegarLoop]: Interpolant automaton has 78 states [2018-10-24 12:17:21,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2018-10-24 12:17:21,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1652, Invalid=11458, Unknown=0, NotChecked=0, Total=13110 [2018-10-24 12:17:21,185 INFO L87 Difference]: Start difference. First operand 180 states and 181 transitions. Second operand 78 states. [2018-10-24 12:17:24,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:24,468 INFO L93 Difference]: Finished difference Result 331 states and 336 transitions. [2018-10-24 12:17:24,469 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-24 12:17:24,469 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 177 [2018-10-24 12:17:24,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:24,471 INFO L225 Difference]: With dead ends: 331 [2018-10-24 12:17:24,471 INFO L226 Difference]: Without dead ends: 192 [2018-10-24 12:17:24,473 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 278 SyntacticMatches, 6 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5405 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=2306, Invalid=16054, Unknown=0, NotChecked=0, Total=18360 [2018-10-24 12:17:24,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2018-10-24 12:17:24,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 182. [2018-10-24 12:17:24,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2018-10-24 12:17:24,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 183 transitions. [2018-10-24 12:17:24,485 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 183 transitions. Word has length 177 [2018-10-24 12:17:24,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:24,486 INFO L481 AbstractCegarLoop]: Abstraction has 182 states and 183 transitions. [2018-10-24 12:17:24,486 INFO L482 AbstractCegarLoop]: Interpolant automaton has 78 states. [2018-10-24 12:17:24,486 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 183 transitions. [2018-10-24 12:17:24,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-10-24 12:17:24,487 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:24,487 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 17, 17, 17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:24,487 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:24,488 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:24,488 INFO L82 PathProgramCache]: Analyzing trace with hash 1834276540, now seen corresponding path program 32 times [2018-10-24 12:17:24,488 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:24,488 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:24,488 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:24,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:24,489 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:24,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:26,020 INFO L134 CoverageAnalysis]: Checked inductivity of 1382 backedges. 337 proven. 610 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-24 12:17:26,020 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:26,020 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:26,020 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:26,020 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:26,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:26,021 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:26,028 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:17:26,028 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:17:26,099 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-10-24 12:17:26,099 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:26,103 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:26,850 INFO L134 CoverageAnalysis]: Checked inductivity of 1382 backedges. 76 proven. 871 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-24 12:17:26,850 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:27,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1382 backedges. 76 proven. 871 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-24 12:17:27,932 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:27,932 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 41, 41] total 80 [2018-10-24 12:17:27,932 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:27,933 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-24 12:17:27,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-24 12:17:27,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=980, Invalid=5340, Unknown=0, NotChecked=0, Total=6320 [2018-10-24 12:17:27,934 INFO L87 Difference]: Start difference. First operand 182 states and 183 transitions. Second operand 60 states. [2018-10-24 12:17:29,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:29,745 INFO L93 Difference]: Finished difference Result 197 states and 199 transitions. [2018-10-24 12:17:29,746 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-24 12:17:29,746 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 179 [2018-10-24 12:17:29,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:29,748 INFO L225 Difference]: With dead ends: 197 [2018-10-24 12:17:29,748 INFO L226 Difference]: Without dead ends: 195 [2018-10-24 12:17:29,750 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 301 SyntacticMatches, 20 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4487 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=2383, Invalid=10957, Unknown=0, NotChecked=0, Total=13340 [2018-10-24 12:17:29,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2018-10-24 12:17:29,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 190. [2018-10-24 12:17:29,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2018-10-24 12:17:29,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 191 transitions. [2018-10-24 12:17:29,763 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 191 transitions. Word has length 179 [2018-10-24 12:17:29,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:29,763 INFO L481 AbstractCegarLoop]: Abstraction has 190 states and 191 transitions. [2018-10-24 12:17:29,763 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-24 12:17:29,764 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 191 transitions. [2018-10-24 12:17:29,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2018-10-24 12:17:29,765 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:29,765 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:29,765 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:29,765 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:29,765 INFO L82 PathProgramCache]: Analyzing trace with hash -1992952065, now seen corresponding path program 33 times [2018-10-24 12:17:29,765 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:29,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:29,766 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:29,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:29,766 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:29,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:32,337 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 577 proven. 442 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-24 12:17:32,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:32,337 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:32,338 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:32,338 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:32,338 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:32,338 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:32,345 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:17:32,345 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:17:32,402 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:17:32,402 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:32,406 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:34,492 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 81 proven. 938 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-24 12:17:34,492 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:38,207 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 81 proven. 938 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-24 12:17:38,229 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:38,229 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 121 [2018-10-24 12:17:38,229 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:38,230 INFO L460 AbstractCegarLoop]: Interpolant automaton has 82 states [2018-10-24 12:17:38,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2018-10-24 12:17:38,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1812, Invalid=12708, Unknown=0, NotChecked=0, Total=14520 [2018-10-24 12:17:38,231 INFO L87 Difference]: Start difference. First operand 190 states and 191 transitions. Second operand 82 states. [2018-10-24 12:17:42,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:42,291 INFO L93 Difference]: Finished difference Result 349 states and 354 transitions. [2018-10-24 12:17:42,291 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:17:42,291 INFO L78 Accepts]: Start accepts. Automaton has 82 states. Word has length 187 [2018-10-24 12:17:42,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:42,293 INFO L225 Difference]: With dead ends: 349 [2018-10-24 12:17:42,293 INFO L226 Difference]: Without dead ends: 202 [2018-10-24 12:17:42,295 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 441 GetRequests, 294 SyntacticMatches, 6 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5964 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=2530, Invalid=17776, Unknown=0, NotChecked=0, Total=20306 [2018-10-24 12:17:42,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2018-10-24 12:17:42,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 192. [2018-10-24 12:17:42,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-10-24 12:17:42,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 193 transitions. [2018-10-24 12:17:42,309 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 193 transitions. Word has length 187 [2018-10-24 12:17:42,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:42,310 INFO L481 AbstractCegarLoop]: Abstraction has 192 states and 193 transitions. [2018-10-24 12:17:42,310 INFO L482 AbstractCegarLoop]: Interpolant automaton has 82 states. [2018-10-24 12:17:42,310 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 193 transitions. [2018-10-24 12:17:42,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-10-24 12:17:42,311 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:42,312 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 18, 18, 18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:42,312 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:42,312 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:42,312 INFO L82 PathProgramCache]: Analyzing trace with hash 430499321, now seen corresponding path program 34 times [2018-10-24 12:17:42,312 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:42,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:42,313 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:42,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:42,313 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:42,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:43,210 INFO L134 CoverageAnalysis]: Checked inductivity of 1553 backedges. 375 proven. 682 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-24 12:17:43,211 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:43,211 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:43,211 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:43,211 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:43,211 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:43,211 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:43,220 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:43,220 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:17:43,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:43,275 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:44,166 INFO L134 CoverageAnalysis]: Checked inductivity of 1553 backedges. 34 proven. 975 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:17:44,166 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:45,182 INFO L134 CoverageAnalysis]: Checked inductivity of 1553 backedges. 34 proven. 975 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:17:45,203 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:45,203 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 82 [2018-10-24 12:17:45,204 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:45,204 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-10-24 12:17:45,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-10-24 12:17:45,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1057, Invalid=5585, Unknown=0, NotChecked=0, Total=6642 [2018-10-24 12:17:45,205 INFO L87 Difference]: Start difference. First operand 192 states and 193 transitions. Second operand 63 states. [2018-10-24 12:17:47,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:47,590 INFO L93 Difference]: Finished difference Result 207 states and 209 transitions. [2018-10-24 12:17:47,590 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-24 12:17:47,590 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 189 [2018-10-24 12:17:47,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:47,592 INFO L225 Difference]: With dead ends: 207 [2018-10-24 12:17:47,592 INFO L226 Difference]: Without dead ends: 205 [2018-10-24 12:17:47,593 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 459 GetRequests, 322 SyntacticMatches, 19 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4726 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2579, Invalid=11701, Unknown=0, NotChecked=0, Total=14280 [2018-10-24 12:17:47,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-10-24 12:17:47,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 200. [2018-10-24 12:17:47,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2018-10-24 12:17:47,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 201 transitions. [2018-10-24 12:17:47,605 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 201 transitions. Word has length 189 [2018-10-24 12:17:47,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:47,605 INFO L481 AbstractCegarLoop]: Abstraction has 200 states and 201 transitions. [2018-10-24 12:17:47,605 INFO L482 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-10-24 12:17:47,605 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 201 transitions. [2018-10-24 12:17:47,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-10-24 12:17:47,607 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:47,607 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:47,607 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:47,607 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:47,607 INFO L82 PathProgramCache]: Analyzing trace with hash -128353988, now seen corresponding path program 35 times [2018-10-24 12:17:47,607 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:47,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:47,608 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:17:47,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:47,608 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:47,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:17:49,316 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 647 proven. 486 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-24 12:17:49,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:49,316 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:17:49,316 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:17:49,316 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:17:49,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:17:49,317 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:17:49,325 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:17:49,325 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:17:49,406 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2018-10-24 12:17:49,406 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:17:49,410 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:17:51,384 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 86 proven. 1047 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-24 12:17:51,384 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:54,640 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 86 proven. 1047 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-24 12:17:54,660 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:54,660 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 47, 46] total 128 [2018-10-24 12:17:54,660 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:54,661 INFO L460 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-10-24 12:17:54,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-10-24 12:17:54,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2072, Invalid=14184, Unknown=0, NotChecked=0, Total=16256 [2018-10-24 12:17:54,663 INFO L87 Difference]: Start difference. First operand 200 states and 201 transitions. Second operand 87 states. [2018-10-24 12:17:57,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:17:57,963 INFO L93 Difference]: Finished difference Result 289 states and 310 transitions. [2018-10-24 12:17:57,964 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-24 12:17:57,964 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 197 [2018-10-24 12:17:57,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:17:57,966 INFO L225 Difference]: With dead ends: 289 [2018-10-24 12:17:57,966 INFO L226 Difference]: Without dead ends: 202 [2018-10-24 12:17:57,968 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 310 SyntacticMatches, 5 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9456 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=2713, Invalid=20239, Unknown=0, NotChecked=0, Total=22952 [2018-10-24 12:17:57,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2018-10-24 12:17:57,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 202. [2018-10-24 12:17:57,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2018-10-24 12:17:57,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 203 transitions. [2018-10-24 12:17:57,980 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 203 transitions. Word has length 197 [2018-10-24 12:17:57,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:17:57,981 INFO L481 AbstractCegarLoop]: Abstraction has 202 states and 203 transitions. [2018-10-24 12:17:57,981 INFO L482 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-10-24 12:17:57,981 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 203 transitions. [2018-10-24 12:17:57,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2018-10-24 12:17:57,982 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:17:57,982 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 19, 19, 19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:17:57,982 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:17:57,982 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:17:57,982 INFO L82 PathProgramCache]: Analyzing trace with hash 668039094, now seen corresponding path program 36 times [2018-10-24 12:17:57,982 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:17:57,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:57,983 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:17:57,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:17:57,983 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:17:57,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:00,179 INFO L134 CoverageAnalysis]: Checked inductivity of 1734 backedges. 415 proven. 758 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-24 12:18:00,179 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:00,179 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:00,179 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:00,179 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:00,179 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:00,180 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:00,188 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:00,189 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:00,252 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:00,252 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:00,256 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:02,097 INFO L134 CoverageAnalysis]: Checked inductivity of 1734 backedges. 35 proven. 1138 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-24 12:18:02,097 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:03,331 INFO L134 CoverageAnalysis]: Checked inductivity of 1734 backedges. 35 proven. 1138 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-24 12:18:03,352 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:03,352 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 45, 45] total 88 [2018-10-24 12:18:03,353 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:03,353 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-10-24 12:18:03,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-10-24 12:18:03,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1170, Invalid=6486, Unknown=0, NotChecked=0, Total=7656 [2018-10-24 12:18:03,354 INFO L87 Difference]: Start difference. First operand 202 states and 203 transitions. Second operand 66 states. [2018-10-24 12:18:05,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:05,736 INFO L93 Difference]: Finished difference Result 217 states and 219 transitions. [2018-10-24 12:18:05,736 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-24 12:18:05,736 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 199 [2018-10-24 12:18:05,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:05,738 INFO L225 Difference]: With dead ends: 217 [2018-10-24 12:18:05,738 INFO L226 Difference]: Without dead ends: 215 [2018-10-24 12:18:05,740 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 335 SyntacticMatches, 22 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5508 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=2855, Invalid=13401, Unknown=0, NotChecked=0, Total=16256 [2018-10-24 12:18:05,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2018-10-24 12:18:05,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 210. [2018-10-24 12:18:05,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-10-24 12:18:05,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 211 transitions. [2018-10-24 12:18:05,752 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 211 transitions. Word has length 199 [2018-10-24 12:18:05,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:05,753 INFO L481 AbstractCegarLoop]: Abstraction has 210 states and 211 transitions. [2018-10-24 12:18:05,753 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-10-24 12:18:05,753 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 211 transitions. [2018-10-24 12:18:05,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2018-10-24 12:18:05,754 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:05,754 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:05,755 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:05,755 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:05,755 INFO L82 PathProgramCache]: Analyzing trace with hash -1746469383, now seen corresponding path program 37 times [2018-10-24 12:18:05,755 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:05,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:05,756 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:05,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:05,756 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:05,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:08,517 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 721 proven. 532 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-24 12:18:08,517 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:08,517 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:08,517 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:08,518 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:08,518 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:08,518 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:08,525 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:08,525 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:08,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:08,592 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:11,114 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 37 proven. 1216 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-24 12:18:11,115 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:15,576 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 37 proven. 1216 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-24 12:18:15,608 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:15,608 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 133 [2018-10-24 12:18:15,608 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:15,608 INFO L460 AbstractCegarLoop]: Interpolant automaton has 90 states [2018-10-24 12:18:15,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2018-10-24 12:18:15,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2207, Invalid=15349, Unknown=0, NotChecked=0, Total=17556 [2018-10-24 12:18:15,610 INFO L87 Difference]: Start difference. First operand 210 states and 211 transitions. Second operand 90 states. [2018-10-24 12:18:20,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:20,715 INFO L93 Difference]: Finished difference Result 385 states and 390 transitions. [2018-10-24 12:18:20,715 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-24 12:18:20,715 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 207 [2018-10-24 12:18:20,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:20,717 INFO L225 Difference]: With dead ends: 385 [2018-10-24 12:18:20,717 INFO L226 Difference]: Without dead ends: 222 [2018-10-24 12:18:20,720 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 326 SyntacticMatches, 6 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7256 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=3062, Invalid=21430, Unknown=0, NotChecked=0, Total=24492 [2018-10-24 12:18:20,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-10-24 12:18:20,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 212. [2018-10-24 12:18:20,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 212 states. [2018-10-24 12:18:20,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 213 transitions. [2018-10-24 12:18:20,734 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 213 transitions. Word has length 207 [2018-10-24 12:18:20,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:20,735 INFO L481 AbstractCegarLoop]: Abstraction has 212 states and 213 transitions. [2018-10-24 12:18:20,735 INFO L482 AbstractCegarLoop]: Interpolant automaton has 90 states. [2018-10-24 12:18:20,735 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 213 transitions. [2018-10-24 12:18:20,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-10-24 12:18:20,736 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:20,736 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 20, 20, 20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:20,737 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:20,737 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:20,737 INFO L82 PathProgramCache]: Analyzing trace with hash -50942989, now seen corresponding path program 38 times [2018-10-24 12:18:20,737 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:20,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:20,738 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:20,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:20,738 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:20,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:21,961 INFO L134 CoverageAnalysis]: Checked inductivity of 1925 backedges. 457 proven. 838 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-24 12:18:21,961 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:21,961 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:21,961 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:21,961 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:21,961 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:21,962 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:21,969 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:21,969 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:22,234 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-10-24 12:18:22,234 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:22,239 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:23,290 INFO L134 CoverageAnalysis]: Checked inductivity of 1925 backedges. 91 proven. 1204 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-24 12:18:23,290 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:24,703 INFO L134 CoverageAnalysis]: Checked inductivity of 1925 backedges. 91 proven. 1204 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-24 12:18:24,725 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:24,725 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 47, 47] total 92 [2018-10-24 12:18:24,725 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:24,726 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-10-24 12:18:24,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-10-24 12:18:24,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1298, Invalid=7074, Unknown=0, NotChecked=0, Total=8372 [2018-10-24 12:18:24,727 INFO L87 Difference]: Start difference. First operand 212 states and 213 transitions. Second operand 69 states. [2018-10-24 12:18:27,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:27,301 INFO L93 Difference]: Finished difference Result 227 states and 229 transitions. [2018-10-24 12:18:27,301 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-24 12:18:27,302 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 209 [2018-10-24 12:18:27,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:27,303 INFO L225 Difference]: With dead ends: 227 [2018-10-24 12:18:27,303 INFO L226 Difference]: Without dead ends: 225 [2018-10-24 12:18:27,304 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 352 SyntacticMatches, 23 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6056 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3187, Invalid=14635, Unknown=0, NotChecked=0, Total=17822 [2018-10-24 12:18:27,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2018-10-24 12:18:27,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 220. [2018-10-24 12:18:27,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2018-10-24 12:18:27,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 221 transitions. [2018-10-24 12:18:27,319 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 221 transitions. Word has length 209 [2018-10-24 12:18:27,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:27,319 INFO L481 AbstractCegarLoop]: Abstraction has 220 states and 221 transitions. [2018-10-24 12:18:27,319 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-10-24 12:18:27,319 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 221 transitions. [2018-10-24 12:18:27,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2018-10-24 12:18:27,321 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:27,321 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:27,321 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:27,321 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:27,321 INFO L82 PathProgramCache]: Analyzing trace with hash -1293507274, now seen corresponding path program 39 times [2018-10-24 12:18:27,322 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:27,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:27,322 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:27,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:27,322 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:27,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:29,306 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 799 proven. 580 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2018-10-24 12:18:29,306 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:29,306 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:29,306 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:29,306 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:29,306 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:29,306 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:29,314 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:29,314 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:29,382 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:29,382 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:29,387 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:32,690 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 96 proven. 1283 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2018-10-24 12:18:32,690 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:37,318 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 96 proven. 1283 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2018-10-24 12:18:37,339 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:37,339 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 139 [2018-10-24 12:18:37,339 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:37,339 INFO L460 AbstractCegarLoop]: Interpolant automaton has 94 states [2018-10-24 12:18:37,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2018-10-24 12:18:37,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2391, Invalid=16791, Unknown=0, NotChecked=0, Total=19182 [2018-10-24 12:18:37,341 INFO L87 Difference]: Start difference. First operand 220 states and 221 transitions. Second operand 94 states. [2018-10-24 12:18:42,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:42,549 INFO L93 Difference]: Finished difference Result 403 states and 408 transitions. [2018-10-24 12:18:42,549 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-24 12:18:42,549 INFO L78 Accepts]: Start accepts. Automaton has 94 states. Word has length 217 [2018-10-24 12:18:42,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:42,551 INFO L225 Difference]: With dead ends: 403 [2018-10-24 12:18:42,551 INFO L226 Difference]: Without dead ends: 232 [2018-10-24 12:18:42,552 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 510 GetRequests, 342 SyntacticMatches, 6 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7899 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=3319, Invalid=23413, Unknown=0, NotChecked=0, Total=26732 [2018-10-24 12:18:42,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2018-10-24 12:18:42,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 222. [2018-10-24 12:18:42,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2018-10-24 12:18:42,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 223 transitions. [2018-10-24 12:18:42,568 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 223 transitions. Word has length 217 [2018-10-24 12:18:42,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:42,568 INFO L481 AbstractCegarLoop]: Abstraction has 222 states and 223 transitions. [2018-10-24 12:18:42,568 INFO L482 AbstractCegarLoop]: Interpolant automaton has 94 states. [2018-10-24 12:18:42,568 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 223 transitions. [2018-10-24 12:18:42,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2018-10-24 12:18:42,569 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:42,570 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 21, 21, 21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:42,570 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:42,570 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:42,570 INFO L82 PathProgramCache]: Analyzing trace with hash 1163436720, now seen corresponding path program 40 times [2018-10-24 12:18:42,570 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:42,571 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:42,571 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:42,571 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:42,571 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:42,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:43,486 INFO L134 CoverageAnalysis]: Checked inductivity of 2126 backedges. 501 proven. 922 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2018-10-24 12:18:43,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:43,487 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:43,487 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:43,487 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:43,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:43,487 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:43,496 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:43,496 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:43,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:43,563 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:44,630 INFO L134 CoverageAnalysis]: Checked inductivity of 2126 backedges. 40 proven. 1326 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-24 12:18:44,630 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:45,975 INFO L134 CoverageAnalysis]: Checked inductivity of 2126 backedges. 40 proven. 1326 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-24 12:18:45,995 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:45,995 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47, 47] total 94 [2018-10-24 12:18:45,995 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:45,996 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-10-24 12:18:45,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-10-24 12:18:45,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1387, Invalid=7355, Unknown=0, NotChecked=0, Total=8742 [2018-10-24 12:18:45,997 INFO L87 Difference]: Start difference. First operand 222 states and 223 transitions. Second operand 72 states. [2018-10-24 12:18:49,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:49,025 INFO L93 Difference]: Finished difference Result 237 states and 239 transitions. [2018-10-24 12:18:49,025 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-24 12:18:49,025 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 219 [2018-10-24 12:18:49,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:49,027 INFO L225 Difference]: With dead ends: 237 [2018-10-24 12:18:49,027 INFO L226 Difference]: Without dead ends: 235 [2018-10-24 12:18:49,029 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 531 GetRequests, 373 SyntacticMatches, 22 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6331 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=3413, Invalid=15493, Unknown=0, NotChecked=0, Total=18906 [2018-10-24 12:18:49,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2018-10-24 12:18:49,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 230. [2018-10-24 12:18:49,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 230 states. [2018-10-24 12:18:49,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 231 transitions. [2018-10-24 12:18:49,043 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 231 transitions. Word has length 219 [2018-10-24 12:18:49,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:49,043 INFO L481 AbstractCegarLoop]: Abstraction has 230 states and 231 transitions. [2018-10-24 12:18:49,044 INFO L482 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-10-24 12:18:49,044 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 231 transitions. [2018-10-24 12:18:49,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2018-10-24 12:18:49,045 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:49,045 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:49,045 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:49,045 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:49,046 INFO L82 PathProgramCache]: Analyzing trace with hash 1131974387, now seen corresponding path program 41 times [2018-10-24 12:18:49,046 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:49,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:49,046 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:49,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:49,047 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:49,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:51,383 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 881 proven. 630 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2018-10-24 12:18:51,383 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:51,383 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:51,383 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:51,384 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:51,384 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:51,384 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:51,393 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:51,393 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:51,489 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-10-24 12:18:51,489 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:51,493 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:53,208 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 101 proven. 1410 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2018-10-24 12:18:53,208 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:56,915 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 101 proven. 1410 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2018-10-24 12:18:56,936 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:56,937 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 53, 52] total 124 [2018-10-24 12:18:56,937 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:56,937 INFO L460 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-10-24 12:18:56,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-10-24 12:18:56,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2057, Invalid=13195, Unknown=0, NotChecked=0, Total=15252 [2018-10-24 12:18:56,938 INFO L87 Difference]: Start difference. First operand 230 states and 231 transitions. Second operand 77 states. [2018-10-24 12:19:00,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:00,707 INFO L93 Difference]: Finished difference Result 331 states and 355 transitions. [2018-10-24 12:19:00,707 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-10-24 12:19:00,707 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 227 [2018-10-24 12:19:00,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:00,709 INFO L225 Difference]: With dead ends: 331 [2018-10-24 12:19:00,709 INFO L226 Difference]: Without dead ends: 232 [2018-10-24 12:19:00,711 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 532 GetRequests, 380 SyntacticMatches, 5 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7605 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=2765, Invalid=19287, Unknown=0, NotChecked=0, Total=22052 [2018-10-24 12:19:00,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2018-10-24 12:19:00,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 232. [2018-10-24 12:19:00,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2018-10-24 12:19:00,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 233 transitions. [2018-10-24 12:19:00,728 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 233 transitions. Word has length 227 [2018-10-24 12:19:00,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:00,728 INFO L481 AbstractCegarLoop]: Abstraction has 232 states and 233 transitions. [2018-10-24 12:19:00,728 INFO L482 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-10-24 12:19:00,729 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 233 transitions. [2018-10-24 12:19:00,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2018-10-24 12:19:00,730 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:00,730 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 22, 22, 22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:00,730 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:00,730 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:00,731 INFO L82 PathProgramCache]: Analyzing trace with hash 911178733, now seen corresponding path program 42 times [2018-10-24 12:19:00,731 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:00,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:00,731 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:00,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:00,732 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:00,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:01,579 INFO L134 CoverageAnalysis]: Checked inductivity of 2337 backedges. 547 proven. 1010 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2018-10-24 12:19:01,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:01,580 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:01,580 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:01,580 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:01,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:01,580 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:01,589 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:19:01,590 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:19:01,656 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:19:01,656 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:01,662 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:02,817 INFO L134 CoverageAnalysis]: Checked inductivity of 2337 backedges. 41 proven. 1516 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2018-10-24 12:19:02,818 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:04,697 INFO L134 CoverageAnalysis]: Checked inductivity of 2337 backedges. 41 proven. 1516 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2018-10-24 12:19:04,718 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:04,718 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 51, 51] total 100 [2018-10-24 12:19:04,718 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:04,719 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-10-24 12:19:04,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-10-24 12:19:04,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1515, Invalid=8385, Unknown=0, NotChecked=0, Total=9900 [2018-10-24 12:19:04,720 INFO L87 Difference]: Start difference. First operand 232 states and 233 transitions. Second operand 75 states. [2018-10-24 12:19:07,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:07,794 INFO L93 Difference]: Finished difference Result 247 states and 249 transitions. [2018-10-24 12:19:07,794 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-10-24 12:19:07,795 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 229 [2018-10-24 12:19:07,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:07,797 INFO L225 Difference]: With dead ends: 247 [2018-10-24 12:19:07,797 INFO L226 Difference]: Without dead ends: 245 [2018-10-24 12:19:07,798 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 555 GetRequests, 386 SyntacticMatches, 25 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7233 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=3728, Invalid=17442, Unknown=0, NotChecked=0, Total=21170 [2018-10-24 12:19:07,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2018-10-24 12:19:07,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 240. [2018-10-24 12:19:07,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2018-10-24 12:19:07,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 241 transitions. [2018-10-24 12:19:07,815 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 241 transitions. Word has length 229 [2018-10-24 12:19:07,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:07,815 INFO L481 AbstractCegarLoop]: Abstraction has 240 states and 241 transitions. [2018-10-24 12:19:07,815 INFO L482 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-10-24 12:19:07,815 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 241 transitions. [2018-10-24 12:19:07,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2018-10-24 12:19:07,817 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:07,817 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:07,817 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:07,817 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:07,817 INFO L82 PathProgramCache]: Analyzing trace with hash 886364976, now seen corresponding path program 43 times [2018-10-24 12:19:07,818 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:07,818 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:07,818 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:07,818 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:07,819 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:07,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:10,324 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 967 proven. 682 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-24 12:19:10,325 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:10,325 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:10,325 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:10,325 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:10,325 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:10,325 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:10,335 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:10,336 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:19:10,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:10,411 INFO L273 TraceCheckSpWp]: Computing forward predicates... Received shutdown request... [2018-10-24 12:19:12,778 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-24 12:19:12,979 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:12,980 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-24 12:19:12,986 WARN L205 ceAbstractionStarter]: Timeout [2018-10-24 12:19:12,986 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:19:12 BoogieIcfgContainer [2018-10-24 12:19:12,986 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:19:12,987 INFO L168 Benchmark]: Toolchain (without parser) took 238625.94 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 738.7 MB). Free memory was 1.4 GB in the beginning and 1.8 GB in the end (delta: -334.2 MB). Peak memory consumption was 404.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:19:12,988 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:19:12,988 INFO L168 Benchmark]: CACSL2BoogieTranslator took 261.37 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:19:12,989 INFO L168 Benchmark]: Boogie Procedure Inliner took 21.08 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:19:12,989 INFO L168 Benchmark]: Boogie Preprocessor took 23.29 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:19:12,990 INFO L168 Benchmark]: RCFGBuilder took 379.87 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 746.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -799.8 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. [2018-10-24 12:19:12,990 INFO L168 Benchmark]: TraceAbstraction took 237935.58 ms. Allocated memory was 2.3 GB in the beginning and 2.3 GB in the end (delta: -7.3 MB). Free memory was 2.2 GB in the beginning and 1.8 GB in the end (delta: 455.1 MB). Peak memory consumption was 447.7 MB. Max. memory is 7.1 GB. [2018-10-24 12:19:12,994 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 261.37 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 21.08 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 23.29 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 379.87 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 746.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -799.8 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 237935.58 ms. Allocated memory was 2.3 GB in the beginning and 2.3 GB in the end (delta: -7.3 MB). Free memory was 2.2 GB in the beginning and 1.8 GB in the end (delta: 455.1 MB). Peak memory consumption was 447.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 238 with TraceHistMax 24,while TraceCheckSpWp was constructing forward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 83 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. TIMEOUT Result, 237.8s OverallTime, 47 OverallIterations, 24 TraceHistogramMax, 81.6s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 1508 SDtfs, 6571 SDslu, 42839 SDs, 0 SdLazy, 64097 SolverSat, 6199 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 45.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 13086 GetRequests, 8817 SyntacticMatches, 425 SemanticMatches, 3844 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136504 ImplicationChecksByTransitivity, 161.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=240occurred in iteration=46, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 1.1s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.4s AutomataMinimizationTime, 46 MinimizatonAttempts, 240 StatesRemovedByMinimization, 35 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.3s SsaConstructionTime, 2.5s SatisfiabilityAnalysisTime, 143.4s InterpolantComputationTime, 10853 NumberOfCodeBlocks, 10853 NumberOfCodeBlocksAsserted, 281 NumberOfCheckSat, 16131 ConstructedInterpolants, 0 QuantifiedInterpolants, 19443847 SizeOfPredicates, 233 NumberOfNonLiveVariables, 11594 ConjunctsInSsa, 2249 ConjunctsInUnsatCore, 134 InterpolantComputations, 2 PerfectInterpolantSequences, 47728/106788 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown