java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT-LIM.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 22:05:50,671 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 22:05:50,676 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 22:05:50,692 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 22:05:50,693 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 22:05:50,694 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 22:05:50,695 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 22:05:50,697 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 22:05:50,699 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 22:05:50,700 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 22:05:50,701 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 22:05:50,701 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 22:05:50,702 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 22:05:50,703 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 22:05:50,704 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 22:05:50,705 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 22:05:50,706 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 22:05:50,708 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 22:05:50,710 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 22:05:50,712 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 22:05:50,713 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 22:05:50,714 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 22:05:50,717 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 22:05:50,717 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 22:05:50,718 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 22:05:50,719 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 22:05:50,720 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 22:05:50,723 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 22:05:50,724 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 22:05:50,727 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 22:05:50,728 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 22:05:50,729 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-11-07 22:05:50,734 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT-LIM.epf [2018-11-07 22:05:50,770 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 22:05:50,770 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 22:05:50,772 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 22:05:50,772 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 22:05:50,772 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 22:05:50,772 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 22:05:50,773 INFO L133 SettingsManager]: * Maximum recursion depth of evaluation operations=6 [2018-11-07 22:05:50,773 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 22:05:50,773 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 22:05:50,773 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 22:05:50,774 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 22:05:50,774 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 22:05:50,774 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 22:05:50,775 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 22:05:50,775 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 22:05:50,775 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 22:05:50,775 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 22:05:50,776 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 22:05:50,776 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 22:05:50,777 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 22:05:50,777 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 22:05:50,777 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 22:05:50,777 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 22:05:50,777 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 22:05:50,777 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 22:05:50,778 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 22:05:50,778 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 22:05:50,778 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 22:05:50,778 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 22:05:50,778 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 22:05:50,779 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 22:05:50,779 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 22:05:50,780 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 22:05:50,780 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 22:05:50,780 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 22:05:50,848 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 22:05:50,866 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 22:05:50,871 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 22:05:50,873 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 22:05:50,873 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 22:05:50,874 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call1.i [2018-11-07 22:05:50,934 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/76f33311f/9b4c480d1f94449196ba3bab7ddff9df/FLAGf6b62b71f [2018-11-07 22:05:51,429 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 22:05:51,430 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call1.i [2018-11-07 22:05:51,444 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/76f33311f/9b4c480d1f94449196ba3bab7ddff9df/FLAGf6b62b71f [2018-11-07 22:05:51,466 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/76f33311f/9b4c480d1f94449196ba3bab7ddff9df [2018-11-07 22:05:51,478 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 22:05:51,479 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 22:05:51,480 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 22:05:51,481 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 22:05:51,485 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 22:05:51,486 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:05:51" (1/1) ... [2018-11-07 22:05:51,489 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d8d1b0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:51, skipping insertion in model container [2018-11-07 22:05:51,489 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:05:51" (1/1) ... [2018-11-07 22:05:51,500 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 22:05:51,523 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 22:05:51,705 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:05:51,709 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 22:05:51,725 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:05:51,742 INFO L193 MainTranslator]: Completed translation [2018-11-07 22:05:51,743 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:51 WrapperNode [2018-11-07 22:05:51,743 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 22:05:51,744 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 22:05:51,744 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 22:05:51,745 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 22:05:51,756 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:51" (1/1) ... [2018-11-07 22:05:51,762 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:51" (1/1) ... [2018-11-07 22:05:51,769 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 22:05:51,770 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 22:05:51,770 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 22:05:51,770 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 22:05:51,782 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:51" (1/1) ... [2018-11-07 22:05:51,782 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:51" (1/1) ... [2018-11-07 22:05:51,783 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:51" (1/1) ... [2018-11-07 22:05:51,783 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:51" (1/1) ... [2018-11-07 22:05:51,787 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:51" (1/1) ... [2018-11-07 22:05:51,794 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:51" (1/1) ... [2018-11-07 22:05:51,795 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:51" (1/1) ... [2018-11-07 22:05:51,797 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 22:05:51,797 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 22:05:51,797 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 22:05:51,798 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 22:05:51,799 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:51" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:05:51,921 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 22:05:51,921 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 22:05:51,921 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 22:05:51,921 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 22:05:51,922 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 22:05:51,922 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 22:05:51,922 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 22:05:51,922 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 22:05:52,107 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 22:05:52,108 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:05:52 BoogieIcfgContainer [2018-11-07 22:05:52,108 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 22:05:52,109 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 22:05:52,110 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 22:05:52,113 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 22:05:52,113 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 10:05:51" (1/3) ... [2018-11-07 22:05:52,114 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2fb01595 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:05:52, skipping insertion in model container [2018-11-07 22:05:52,114 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:51" (2/3) ... [2018-11-07 22:05:52,115 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2fb01595 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:05:52, skipping insertion in model container [2018-11-07 22:05:52,115 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:05:52" (3/3) ... [2018-11-07 22:05:52,117 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_false-unreach-call1.i [2018-11-07 22:05:52,127 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 22:05:52,134 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 22:05:52,147 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 22:05:52,181 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 22:05:52,181 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 22:05:52,181 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 22:05:52,182 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 22:05:52,182 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 22:05:52,182 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 22:05:52,182 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 22:05:52,182 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 22:05:52,202 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-11-07 22:05:52,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-07 22:05:52,208 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:05:52,211 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:05:52,214 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:05:52,219 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:52,220 INFO L82 PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times [2018-11-07 22:05:52,222 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:05:52,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:52,268 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:05:52,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:52,269 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:05:52,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:52,326 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:52,328 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:05:52,328 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 22:05:52,328 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:05:52,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 22:05:52,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 22:05:52,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 22:05:52,353 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-11-07 22:05:52,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:05:52,377 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-11-07 22:05:52,377 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 22:05:52,379 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-11-07 22:05:52,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:05:52,388 INFO L225 Difference]: With dead ends: 29 [2018-11-07 22:05:52,388 INFO L226 Difference]: Without dead ends: 12 [2018-11-07 22:05:52,393 INFO L604 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 [2018-11-07 22:05:52,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-11-07 22:05:52,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-11-07 22:05:52,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-11-07 22:05:52,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-11-07 22:05:52,432 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-11-07 22:05:52,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:05:52,432 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-11-07 22:05:52,432 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 22:05:52,433 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-11-07 22:05:52,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-07 22:05:52,433 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:05:52,434 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:05:52,434 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:05:52,434 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:52,435 INFO L82 PathProgramCache]: Analyzing trace with hash -571410792, now seen corresponding path program 1 times [2018-11-07 22:05:52,435 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:05:52,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:52,438 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:05:52,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:52,438 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:05:52,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:52,600 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:52,601 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:05:52,601 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-07 22:05:52,602 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:05:52,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 22:05:52,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 22:05:52,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 22:05:52,605 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2018-11-07 22:05:52,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:05:52,677 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-11-07 22:05:52,678 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 22:05:52,679 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-11-07 22:05:52,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:05:52,680 INFO L225 Difference]: With dead ends: 19 [2018-11-07 22:05:52,680 INFO L226 Difference]: Without dead ends: 14 [2018-11-07 22:05:52,682 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 22:05:52,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-11-07 22:05:52,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-11-07 22:05:52,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-11-07 22:05:52,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-11-07 22:05:52,687 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-11-07 22:05:52,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:05:52,687 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-11-07 22:05:52,687 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 22:05:52,688 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-11-07 22:05:52,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-07 22:05:52,689 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:05:52,689 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:05:52,689 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:05:52,691 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:52,691 INFO L82 PathProgramCache]: Analyzing trace with hash 1625028318, now seen corresponding path program 1 times [2018-11-07 22:05:52,691 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:05:52,692 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:52,692 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:05:52,693 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:52,694 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:05:52,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:53,020 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:53,020 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:53,021 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:05:53,022 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-11-07 22:05:53,023 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [20], [23], [25], [31], [32], [33], [35] [2018-11-07 22:05:53,059 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 22:05:53,059 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 22:05:53,157 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 22:05:53,289 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 22:05:53,291 INFO L272 AbstractInterpreter]: Visited 12 different actions 60 times. Merged at 3 different actions 22 times. Widened at 1 different actions 4 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-11-07 22:05:53,303 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:53,304 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 22:05:53,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:53,305 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:05:53,321 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:05:53,321 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:05:53,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:53,359 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:05:53,424 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:53,425 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:05:53,548 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:53,568 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:05:53,569 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-11-07 22:05:53,569 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:05:53,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-07 22:05:53,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-07 22:05:53,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-11-07 22:05:53,571 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2018-11-07 22:05:53,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:05:53,593 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-11-07 22:05:53,594 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-07 22:05:53,594 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-11-07 22:05:53,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:05:53,595 INFO L225 Difference]: With dead ends: 21 [2018-11-07 22:05:53,595 INFO L226 Difference]: Without dead ends: 16 [2018-11-07 22:05:53,596 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-11-07 22:05:53,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-11-07 22:05:53,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-11-07 22:05:53,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-11-07 22:05:53,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-11-07 22:05:53,602 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-11-07 22:05:53,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:05:53,603 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-11-07 22:05:53,603 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-07 22:05:53,603 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-11-07 22:05:53,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-11-07 22:05:53,604 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:05:53,604 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:05:53,604 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:05:53,605 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:53,605 INFO L82 PathProgramCache]: Analyzing trace with hash -720896604, now seen corresponding path program 2 times [2018-11-07 22:05:53,605 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:05:53,606 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:53,606 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:05:53,606 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:53,607 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:05:53,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:53,774 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:53,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:53,775 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:05:53,775 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:05:53,776 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:05:53,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:53,776 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:05:53,793 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:05:53,793 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:05:53,838 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 22:05:53,838 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:05:53,842 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:05:53,878 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:53,879 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:05:54,140 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:54,161 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:05:54,162 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-11-07 22:05:54,162 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:05:54,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-07 22:05:54,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-07 22:05:54,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-11-07 22:05:54,163 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 5 states. [2018-11-07 22:05:54,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:05:54,192 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-11-07 22:05:54,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 22:05:54,193 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-11-07 22:05:54,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:05:54,194 INFO L225 Difference]: With dead ends: 23 [2018-11-07 22:05:54,194 INFO L226 Difference]: Without dead ends: 18 [2018-11-07 22:05:54,195 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-11-07 22:05:54,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-11-07 22:05:54,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-11-07 22:05:54,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-11-07 22:05:54,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-11-07 22:05:54,200 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-11-07 22:05:54,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:05:54,201 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-11-07 22:05:54,201 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-07 22:05:54,201 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-11-07 22:05:54,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-11-07 22:05:54,202 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:05:54,202 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:05:54,202 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:05:54,202 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:54,203 INFO L82 PathProgramCache]: Analyzing trace with hash -296916246, now seen corresponding path program 3 times [2018-11-07 22:05:54,203 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:05:54,204 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:54,204 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:05:54,204 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:54,205 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:05:54,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:54,349 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:54,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:54,349 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:05:54,350 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:05:54,350 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:05:54,350 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:54,351 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:05:54,360 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:05:54,360 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:05:54,374 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:05:54,374 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:05:54,376 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:05:54,405 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:54,406 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:05:54,649 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:54,670 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:05:54,670 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-11-07 22:05:54,670 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:05:54,671 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 22:05:54,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 22:05:54,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-11-07 22:05:54,672 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2018-11-07 22:05:54,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:05:54,728 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-11-07 22:05:54,729 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 22:05:54,729 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2018-11-07 22:05:54,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:05:54,730 INFO L225 Difference]: With dead ends: 25 [2018-11-07 22:05:54,730 INFO L226 Difference]: Without dead ends: 20 [2018-11-07 22:05:54,731 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-11-07 22:05:54,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-11-07 22:05:54,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-11-07 22:05:54,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-11-07 22:05:54,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-11-07 22:05:54,736 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-11-07 22:05:54,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:05:54,737 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-11-07 22:05:54,737 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 22:05:54,737 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-11-07 22:05:54,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-07 22:05:54,738 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:05:54,738 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:05:54,738 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:05:54,739 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:54,739 INFO L82 PathProgramCache]: Analyzing trace with hash -873685328, now seen corresponding path program 4 times [2018-11-07 22:05:54,739 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:05:54,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:54,740 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:05:54,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:54,741 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:05:54,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:54,924 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:54,925 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:54,925 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:05:54,926 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:05:54,926 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:05:54,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:54,926 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:05:54,942 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:05:54,942 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:05:54,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:54,959 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:05:54,972 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:54,973 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:05:55,491 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:55,512 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:05:55,512 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-11-07 22:05:55,512 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:05:55,513 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-07 22:05:55,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-07 22:05:55,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-11-07 22:05:55,513 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 7 states. [2018-11-07 22:05:55,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:05:55,558 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-11-07 22:05:55,559 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-07 22:05:55,559 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-11-07 22:05:55,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:05:55,560 INFO L225 Difference]: With dead ends: 27 [2018-11-07 22:05:55,560 INFO L226 Difference]: Without dead ends: 22 [2018-11-07 22:05:55,561 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-11-07 22:05:55,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-11-07 22:05:55,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-11-07 22:05:55,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-11-07 22:05:55,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-11-07 22:05:55,567 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-11-07 22:05:55,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:05:55,567 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-11-07 22:05:55,567 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-07 22:05:55,567 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-11-07 22:05:55,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-11-07 22:05:55,568 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:05:55,568 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:05:55,568 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:05:55,568 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:55,569 INFO L82 PathProgramCache]: Analyzing trace with hash -1097991946, now seen corresponding path program 5 times [2018-11-07 22:05:55,569 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:05:55,570 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:55,570 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:05:55,570 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:55,570 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:05:55,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:55,823 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:55,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:55,824 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:05:55,824 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:05:55,824 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:05:55,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:55,824 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:05:55,833 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:05:55,834 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:05:55,977 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 22:05:55,977 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:05:55,980 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:05:55,999 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:55,999 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:05:56,174 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:56,199 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:05:56,199 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-11-07 22:05:56,199 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:05:56,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-07 22:05:56,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-07 22:05:56,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-11-07 22:05:56,201 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 8 states. [2018-11-07 22:05:56,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:05:56,309 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-11-07 22:05:56,311 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-07 22:05:56,312 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-11-07 22:05:56,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:05:56,313 INFO L225 Difference]: With dead ends: 29 [2018-11-07 22:05:56,313 INFO L226 Difference]: Without dead ends: 24 [2018-11-07 22:05:56,314 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-11-07 22:05:56,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-11-07 22:05:56,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-11-07 22:05:56,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-07 22:05:56,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-11-07 22:05:56,318 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-11-07 22:05:56,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:05:56,319 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-11-07 22:05:56,319 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-07 22:05:56,319 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-11-07 22:05:56,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-11-07 22:05:56,320 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:05:56,320 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:05:56,320 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:05:56,321 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:56,321 INFO L82 PathProgramCache]: Analyzing trace with hash -1908287044, now seen corresponding path program 6 times [2018-11-07 22:05:56,321 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:05:56,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:56,322 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:05:56,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:56,322 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:05:56,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:56,697 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:56,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:56,698 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:05:56,698 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:05:56,698 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:05:56,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:56,699 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:05:56,708 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:05:56,709 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:05:56,723 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:05:56,723 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:05:56,725 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:05:56,743 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:56,744 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:05:57,017 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:57,050 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:05:57,050 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-11-07 22:05:57,050 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:05:57,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 22:05:57,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 22:05:57,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-11-07 22:05:57,052 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 9 states. [2018-11-07 22:05:57,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:05:57,125 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-11-07 22:05:57,127 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-07 22:05:57,127 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-11-07 22:05:57,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:05:57,128 INFO L225 Difference]: With dead ends: 31 [2018-11-07 22:05:57,128 INFO L226 Difference]: Without dead ends: 26 [2018-11-07 22:05:57,129 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-11-07 22:05:57,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-11-07 22:05:57,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-11-07 22:05:57,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-11-07 22:05:57,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-11-07 22:05:57,135 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-11-07 22:05:57,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:05:57,136 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-11-07 22:05:57,136 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 22:05:57,136 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-11-07 22:05:57,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-11-07 22:05:57,137 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:05:57,137 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:05:57,137 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:05:57,137 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:57,138 INFO L82 PathProgramCache]: Analyzing trace with hash 1082171650, now seen corresponding path program 7 times [2018-11-07 22:05:57,138 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:05:57,138 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:57,139 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:05:57,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:57,139 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:05:57,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:57,352 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:57,353 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:57,353 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:05:57,353 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:05:57,353 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:05:57,353 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:57,354 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:05:57,363 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:05:57,363 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:05:57,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:57,374 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:05:57,385 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:57,386 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:05:57,678 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:57,699 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:05:57,699 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-11-07 22:05:57,699 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:05:57,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 22:05:57,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 22:05:57,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-11-07 22:05:57,701 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 10 states. [2018-11-07 22:05:57,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:05:57,830 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-11-07 22:05:57,833 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 22:05:57,833 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2018-11-07 22:05:57,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:05:57,835 INFO L225 Difference]: With dead ends: 33 [2018-11-07 22:05:57,835 INFO L226 Difference]: Without dead ends: 28 [2018-11-07 22:05:57,836 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-11-07 22:05:57,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-11-07 22:05:57,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-11-07 22:05:57,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-11-07 22:05:57,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-11-07 22:05:57,841 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-11-07 22:05:57,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:05:57,841 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-11-07 22:05:57,841 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 22:05:57,842 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-11-07 22:05:57,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-11-07 22:05:57,842 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:05:57,843 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:05:57,843 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:05:57,843 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:57,843 INFO L82 PathProgramCache]: Analyzing trace with hash 1579855560, now seen corresponding path program 8 times [2018-11-07 22:05:57,843 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:05:57,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:57,844 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:05:57,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:57,844 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:05:57,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:58,025 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:58,025 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:58,026 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:05:58,026 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:05:58,026 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:05:58,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:58,026 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:05:58,037 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:05:58,037 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:06:21,373 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 22:06:21,374 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:21,418 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:21,439 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:21,440 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:21,705 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:21,727 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:21,727 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-11-07 22:06:21,727 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:21,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-07 22:06:21,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-07 22:06:21,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-11-07 22:06:21,728 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 11 states. [2018-11-07 22:06:21,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:21,837 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-11-07 22:06:21,837 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 22:06:21,837 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2018-11-07 22:06:21,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:21,838 INFO L225 Difference]: With dead ends: 35 [2018-11-07 22:06:21,838 INFO L226 Difference]: Without dead ends: 30 [2018-11-07 22:06:21,839 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-11-07 22:06:21,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-11-07 22:06:21,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-11-07 22:06:21,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-07 22:06:21,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-11-07 22:06:21,844 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-11-07 22:06:21,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:21,844 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-11-07 22:06:21,845 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-07 22:06:21,845 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-11-07 22:06:21,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-11-07 22:06:21,846 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:21,846 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:21,846 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:21,846 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:21,847 INFO L82 PathProgramCache]: Analyzing trace with hash -1182244082, now seen corresponding path program 9 times [2018-11-07 22:06:21,847 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:21,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:21,848 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:21,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:21,848 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:21,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:22,082 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:22,083 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:22,083 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:22,083 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:22,084 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:22,084 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:22,084 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:22,093 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:06:22,093 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:06:22,106 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:06:22,107 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:22,109 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:22,121 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:22,121 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:22,395 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:22,416 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:22,417 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-11-07 22:06:22,417 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:22,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-07 22:06:22,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-07 22:06:22,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-11-07 22:06:22,418 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 12 states. [2018-11-07 22:06:22,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:22,591 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-11-07 22:06:22,593 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-07 22:06:22,593 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2018-11-07 22:06:22,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:22,594 INFO L225 Difference]: With dead ends: 37 [2018-11-07 22:06:22,594 INFO L226 Difference]: Without dead ends: 32 [2018-11-07 22:06:22,595 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 48 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-11-07 22:06:22,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-11-07 22:06:22,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-11-07 22:06:22,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-11-07 22:06:22,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-11-07 22:06:22,600 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-11-07 22:06:22,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:22,600 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-11-07 22:06:22,600 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-07 22:06:22,601 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-11-07 22:06:22,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-11-07 22:06:22,602 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:22,602 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:22,602 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:22,602 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:22,603 INFO L82 PathProgramCache]: Analyzing trace with hash -1270211116, now seen corresponding path program 10 times [2018-11-07 22:06:22,603 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:22,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:22,604 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:22,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:22,604 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:22,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:23,125 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:23,126 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:23,126 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:23,126 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:23,126 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:23,126 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:23,126 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:23,137 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:23,137 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:06:23,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:23,162 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:23,182 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:23,182 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:23,593 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:23,614 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:23,614 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-11-07 22:06:23,614 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:23,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 22:06:23,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 22:06:23,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:06:23,616 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 13 states. [2018-11-07 22:06:23,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:23,728 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-11-07 22:06:23,729 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 22:06:23,729 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2018-11-07 22:06:23,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:23,731 INFO L225 Difference]: With dead ends: 39 [2018-11-07 22:06:23,731 INFO L226 Difference]: Without dead ends: 34 [2018-11-07 22:06:23,734 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:06:23,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-11-07 22:06:23,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-11-07 22:06:23,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-11-07 22:06:23,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-11-07 22:06:23,740 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-11-07 22:06:23,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:23,740 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-11-07 22:06:23,740 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 22:06:23,740 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-11-07 22:06:23,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-11-07 22:06:23,741 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:23,742 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:23,742 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:23,742 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:23,742 INFO L82 PathProgramCache]: Analyzing trace with hash 92815130, now seen corresponding path program 11 times [2018-11-07 22:06:23,743 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:23,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:23,744 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:23,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:23,744 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:23,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:24,036 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:24,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:24,037 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:24,037 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:24,037 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:24,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:24,037 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:06:24,046 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:06:24,046 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:07:40,647 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-07 22:07:40,647 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:07:40,821 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:07:41,186 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:41,186 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:08:21,624 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 118 refuted. 14 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:21,650 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:08:21,650 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-11-07 22:08:21,650 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:08:21,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 22:08:21,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 22:08:21,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=440, Unknown=17, NotChecked=0, Total=650 [2018-11-07 22:08:21,652 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 14 states. [2018-11-07 22:08:21,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:08:21,843 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-11-07 22:08:21,845 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 22:08:21,845 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 33 [2018-11-07 22:08:21,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:08:21,846 INFO L225 Difference]: With dead ends: 41 [2018-11-07 22:08:21,846 INFO L226 Difference]: Without dead ends: 36 [2018-11-07 22:08:21,847 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 53 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 40.9s TimeCoverageRelationStatistics Valid=193, Invalid=440, Unknown=17, NotChecked=0, Total=650 [2018-11-07 22:08:21,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-11-07 22:08:21,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-11-07 22:08:21,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-11-07 22:08:21,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-11-07 22:08:21,851 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-11-07 22:08:21,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:08:21,852 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-11-07 22:08:21,852 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 22:08:21,852 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-11-07 22:08:21,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-11-07 22:08:21,853 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:08:21,853 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:08:21,853 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:08:21,854 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:08:21,854 INFO L82 PathProgramCache]: Analyzing trace with hash -3987744, now seen corresponding path program 12 times [2018-11-07 22:08:21,854 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:08:21,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:21,855 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:08:21,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:21,855 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:08:21,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:08:22,241 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:22,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:22,242 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:08:22,242 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:08:22,242 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:08:22,243 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:22,243 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:08:22,256 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:08:22,256 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:08:22,266 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:08:22,266 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:08:22,270 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:08:22,301 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:22,302 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:08:22,788 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:22,808 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:08:22,808 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-11-07 22:08:22,808 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:08:22,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-07 22:08:22,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-07 22:08:22,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-11-07 22:08:22,810 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 15 states. [2018-11-07 22:08:22,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:08:22,953 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-11-07 22:08:22,955 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-07 22:08:22,955 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 35 [2018-11-07 22:08:22,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:08:22,956 INFO L225 Difference]: With dead ends: 43 [2018-11-07 22:08:22,956 INFO L226 Difference]: Without dead ends: 38 [2018-11-07 22:08:22,957 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-11-07 22:08:22,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-11-07 22:08:22,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-11-07 22:08:22,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-11-07 22:08:22,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-11-07 22:08:22,962 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-11-07 22:08:22,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:08:22,962 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-11-07 22:08:22,962 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-07 22:08:22,962 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-11-07 22:08:22,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-11-07 22:08:22,964 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:08:22,964 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:08:22,964 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:08:22,964 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:08:22,964 INFO L82 PathProgramCache]: Analyzing trace with hash 1457730854, now seen corresponding path program 13 times [2018-11-07 22:08:22,965 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:08:22,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:22,966 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:08:22,966 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:22,966 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:08:22,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:08:23,461 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:23,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:23,461 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:08:23,462 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:08:23,462 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:08:23,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:23,462 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:08:23,471 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:08:23,471 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:08:23,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:08:23,484 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:08:23,520 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:23,520 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:08:24,179 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:24,199 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:08:24,200 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-11-07 22:08:24,200 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:08:24,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 22:08:24,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 22:08:24,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-11-07 22:08:24,201 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 16 states. [2018-11-07 22:08:24,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:08:24,384 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-11-07 22:08:24,384 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 22:08:24,384 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 37 [2018-11-07 22:08:24,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:08:24,385 INFO L225 Difference]: With dead ends: 45 [2018-11-07 22:08:24,386 INFO L226 Difference]: Without dead ends: 40 [2018-11-07 22:08:24,387 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-11-07 22:08:24,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-11-07 22:08:24,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-11-07 22:08:24,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-11-07 22:08:24,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-11-07 22:08:24,392 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-11-07 22:08:24,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:08:24,392 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-11-07 22:08:24,392 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 22:08:24,393 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-11-07 22:08:24,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-11-07 22:08:24,393 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:08:24,393 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:08:24,394 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:08:24,394 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:08:24,394 INFO L82 PathProgramCache]: Analyzing trace with hash 1714997740, now seen corresponding path program 14 times [2018-11-07 22:08:24,394 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:08:24,395 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:24,395 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:08:24,395 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:24,395 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:08:24,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:08:24,834 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:24,834 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:24,834 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:08:24,835 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:08:24,835 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:08:24,835 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:24,835 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:08:24,845 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:08:24,845 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:08:36,084 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-07 22:08:36,084 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:08:36,144 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:08:36,169 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:36,169 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:08:37,426 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:37,446 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:08:37,447 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 20] total 35 [2018-11-07 22:08:37,447 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:08:37,447 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-07 22:08:37,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-07 22:08:37,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=883, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 22:08:37,448 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 17 states. [2018-11-07 22:08:37,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:08:37,635 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-11-07 22:08:37,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 22:08:37,636 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2018-11-07 22:08:37,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:08:37,637 INFO L225 Difference]: With dead ends: 47 [2018-11-07 22:08:37,637 INFO L226 Difference]: Without dead ends: 42 [2018-11-07 22:08:37,637 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 59 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=307, Invalid=883, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 22:08:37,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-11-07 22:08:37,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-11-07 22:08:37,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-11-07 22:08:37,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-11-07 22:08:37,643 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-11-07 22:08:37,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:08:37,643 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-11-07 22:08:37,643 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-07 22:08:37,643 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-11-07 22:08:37,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-11-07 22:08:37,644 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:08:37,644 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:08:37,645 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:08:37,645 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:08:37,645 INFO L82 PathProgramCache]: Analyzing trace with hash -159627982, now seen corresponding path program 15 times [2018-11-07 22:08:37,645 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:08:37,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:37,646 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:08:37,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:37,646 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:08:37,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:08:37,931 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:37,932 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:37,932 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:08:37,932 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:08:37,932 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:08:37,932 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:37,932 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:08:37,941 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:08:37,941 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:08:37,960 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:08:37,960 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:08:37,962 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:08:37,998 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:37,998 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:08:38,635 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:38,655 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:08:38,655 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-11-07 22:08:38,655 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:08:38,656 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-07 22:08:38,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-07 22:08:38,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 22:08:38,657 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 18 states. [2018-11-07 22:08:38,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:08:38,866 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-11-07 22:08:38,866 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-07 22:08:38,866 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 41 [2018-11-07 22:08:38,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:08:38,867 INFO L225 Difference]: With dead ends: 49 [2018-11-07 22:08:38,867 INFO L226 Difference]: Without dead ends: 44 [2018-11-07 22:08:38,868 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 22:08:38,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-11-07 22:08:38,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-11-07 22:08:38,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-11-07 22:08:38,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-11-07 22:08:38,874 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-11-07 22:08:38,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:08:38,874 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-11-07 22:08:38,875 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-07 22:08:38,875 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-11-07 22:08:38,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-11-07 22:08:38,875 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:08:38,875 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:08:38,876 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:08:38,876 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:08:38,876 INFO L82 PathProgramCache]: Analyzing trace with hash -2083649800, now seen corresponding path program 16 times [2018-11-07 22:08:38,876 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:08:38,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:38,877 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:08:38,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:38,877 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:08:38,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:08:39,355 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:39,355 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:39,355 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:08:39,355 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:08:39,356 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:08:39,356 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:39,356 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:08:39,365 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:08:39,365 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:08:39,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:08:39,383 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:08:39,403 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:39,403 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:08:40,166 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:40,186 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:08:40,186 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-11-07 22:08:40,187 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:08:40,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 22:08:40,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 22:08:40,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 22:08:40,188 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 19 states. [2018-11-07 22:08:40,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:08:40,591 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-11-07 22:08:40,592 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 22:08:40,592 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 43 [2018-11-07 22:08:40,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:08:40,593 INFO L225 Difference]: With dead ends: 51 [2018-11-07 22:08:40,593 INFO L226 Difference]: Without dead ends: 46 [2018-11-07 22:08:40,594 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 22:08:40,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-11-07 22:08:40,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-11-07 22:08:40,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-11-07 22:08:40,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-11-07 22:08:40,600 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 43 [2018-11-07 22:08:40,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:08:40,600 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-11-07 22:08:40,600 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 22:08:40,601 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-11-07 22:08:40,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-11-07 22:08:40,601 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:08:40,602 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:08:40,602 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:08:40,602 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:08:40,602 INFO L82 PathProgramCache]: Analyzing trace with hash 62287678, now seen corresponding path program 17 times [2018-11-07 22:08:40,602 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:08:40,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:40,603 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:08:40,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:40,603 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:08:40,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:08:41,182 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:08:41,183 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:41,183 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:08:41,183 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:08:41,183 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:08:41,183 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:41,183 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 22:08:41,192 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:08:41,192 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown