java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf -i ../../../trunk/examples/svcomp/loops/n.c11_true-unreach-call_false-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 15:28:54,807 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 15:28:54,809 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 15:28:54,821 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 15:28:54,821 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 15:28:54,822 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 15:28:54,824 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 15:28:54,825 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 15:28:54,827 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 15:28:54,828 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 15:28:54,829 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 15:28:54,829 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 15:28:54,830 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 15:28:54,831 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 15:28:54,832 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 15:28:54,833 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 15:28:54,834 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 15:28:54,836 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 15:28:54,838 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 15:28:54,840 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 15:28:54,841 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 15:28:54,843 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 15:28:54,845 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 15:28:54,846 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 15:28:54,846 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 15:28:54,847 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 15:28:54,848 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 15:28:54,849 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 15:28:54,850 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 15:28:54,851 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 15:28:54,851 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 15:28:54,852 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-27 15:28:54,853 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-27 15:28:54,853 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-27 15:28:54,854 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-27 15:28:54,855 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-27 15:28:54,855 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf [2018-10-27 15:28:54,872 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 15:28:54,872 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 15:28:54,873 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 15:28:54,873 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 15:28:54,873 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 15:28:54,873 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 15:28:54,874 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 15:28:54,874 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 15:28:54,874 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 15:28:54,874 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 15:28:54,874 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 15:28:54,874 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 15:28:54,875 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 15:28:54,875 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 15:28:54,876 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 15:28:54,876 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 15:28:54,876 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 15:28:54,876 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 15:28:54,876 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 15:28:54,876 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 15:28:54,877 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 15:28:54,877 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 15:28:54,877 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 15:28:54,877 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 15:28:54,877 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 15:28:54,878 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 15:28:54,878 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 15:28:54,878 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 15:28:54,878 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 15:28:54,878 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 15:28:54,879 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 15:28:54,879 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 15:28:54,879 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 15:28:54,879 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 15:28:54,923 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 15:28:54,935 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 15:28:54,939 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 15:28:54,941 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 15:28:54,941 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 15:28:54,942 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops/n.c11_true-unreach-call_false-termination.i [2018-10-27 15:28:55,003 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2575e8e8a/78330ff84ade47bca8027f61386c124d/FLAGe9ba1a62d [2018-10-27 15:28:55,434 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 15:28:55,435 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/n.c11_true-unreach-call_false-termination.i [2018-10-27 15:28:55,442 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2575e8e8a/78330ff84ade47bca8027f61386c124d/FLAGe9ba1a62d [2018-10-27 15:28:55,465 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2575e8e8a/78330ff84ade47bca8027f61386c124d [2018-10-27 15:28:55,477 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 15:28:55,478 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 15:28:55,479 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 15:28:55,479 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 15:28:55,485 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 15:28:55,486 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 03:28:55" (1/1) ... [2018-10-27 15:28:55,489 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@48bfbf1d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:28:55, skipping insertion in model container [2018-10-27 15:28:55,489 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 03:28:55" (1/1) ... [2018-10-27 15:28:55,499 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 15:28:55,521 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 15:28:55,705 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 15:28:55,710 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 15:28:55,727 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 15:28:55,740 INFO L193 MainTranslator]: Completed translation [2018-10-27 15:28:55,741 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:28:55 WrapperNode [2018-10-27 15:28:55,741 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 15:28:55,742 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 15:28:55,742 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 15:28:55,742 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 15:28:55,750 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:28:55" (1/1) ... [2018-10-27 15:28:55,755 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:28:55" (1/1) ... [2018-10-27 15:28:55,761 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 15:28:55,761 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 15:28:55,761 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 15:28:55,762 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 15:28:55,769 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:28:55" (1/1) ... [2018-10-27 15:28:55,770 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:28:55" (1/1) ... [2018-10-27 15:28:55,770 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:28:55" (1/1) ... [2018-10-27 15:28:55,770 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:28:55" (1/1) ... [2018-10-27 15:28:55,774 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:28:55" (1/1) ... [2018-10-27 15:28:55,781 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:28:55" (1/1) ... [2018-10-27 15:28:55,782 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:28:55" (1/1) ... [2018-10-27 15:28:55,783 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 15:28:55,786 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 15:28:55,786 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 15:28:55,786 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 15:28:55,787 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:28:55" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 15:28:55,912 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 15:28:55,912 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 15:28:55,912 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 15:28:55,913 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 15:28:55,913 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 15:28:55,913 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 15:28:55,913 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 15:28:55,913 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 15:28:56,135 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 15:28:56,135 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 03:28:56 BoogieIcfgContainer [2018-10-27 15:28:56,136 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 15:28:56,136 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 15:28:56,137 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 15:28:56,140 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 15:28:56,140 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 03:28:55" (1/3) ... [2018-10-27 15:28:56,141 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2276938f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 03:28:56, skipping insertion in model container [2018-10-27 15:28:56,141 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:28:55" (2/3) ... [2018-10-27 15:28:56,142 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2276938f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 03:28:56, skipping insertion in model container [2018-10-27 15:28:56,142 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 03:28:56" (3/3) ... [2018-10-27 15:28:56,144 INFO L112 eAbstractionObserver]: Analyzing ICFG n.c11_true-unreach-call_false-termination.i [2018-10-27 15:28:56,155 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 15:28:56,164 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 15:28:56,197 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 15:28:56,267 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 15:28:56,268 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 15:28:56,268 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 15:28:56,268 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 15:28:56,268 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 15:28:56,268 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 15:28:56,269 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 15:28:56,269 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 15:28:56,290 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-10-27 15:28:56,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-27 15:28:56,298 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:28:56,299 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:28:56,302 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:28:56,308 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:28:56,309 INFO L82 PathProgramCache]: Analyzing trace with hash -2008095039, now seen corresponding path program 1 times [2018-10-27 15:28:56,312 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:28:56,374 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:28:56,374 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:28:56,374 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:28:56,375 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:28:56,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:28:56,439 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:28:56,442 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 15:28:56,442 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 15:28:56,442 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:28:56,448 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 15:28:56,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 15:28:56,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 15:28:56,467 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-10-27 15:28:56,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:28:56,493 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2018-10-27 15:28:56,493 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 15:28:56,498 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-27 15:28:56,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:28:56,507 INFO L225 Difference]: With dead ends: 33 [2018-10-27 15:28:56,507 INFO L226 Difference]: Without dead ends: 14 [2018-10-27 15:28:56,511 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 15:28:56,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-27 15:28:56,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-27 15:28:56,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-27 15:28:56,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2018-10-27 15:28:56,552 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2018-10-27 15:28:56,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:28:56,553 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2018-10-27 15:28:56,553 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 15:28:56,553 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2018-10-27 15:28:56,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-27 15:28:56,554 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:28:56,554 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:28:56,555 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:28:56,555 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:28:56,556 INFO L82 PathProgramCache]: Analyzing trace with hash 1715940768, now seen corresponding path program 1 times [2018-10-27 15:28:56,556 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:28:56,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:28:56,557 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:28:56,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:28:56,558 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:28:56,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:28:56,905 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:28:56,906 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 15:28:56,906 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-27 15:28:56,906 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:28:56,908 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 15:28:56,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 15:28:56,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-27 15:28:56,909 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 5 states. [2018-10-27 15:28:57,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:28:57,011 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-27 15:28:57,012 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 15:28:57,012 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2018-10-27 15:28:57,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:28:57,013 INFO L225 Difference]: With dead ends: 30 [2018-10-27 15:28:57,013 INFO L226 Difference]: Without dead ends: 18 [2018-10-27 15:28:57,014 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-27 15:28:57,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-27 15:28:57,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2018-10-27 15:28:57,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-27 15:28:57,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-10-27 15:28:57,020 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 11 [2018-10-27 15:28:57,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:28:57,021 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2018-10-27 15:28:57,021 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 15:28:57,021 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2018-10-27 15:28:57,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-27 15:28:57,022 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:28:57,022 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:28:57,022 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:28:57,023 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:28:57,023 INFO L82 PathProgramCache]: Analyzing trace with hash 1048902920, now seen corresponding path program 1 times [2018-10-27 15:28:57,023 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:28:57,024 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:28:57,025 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:28:57,025 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:28:57,025 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:28:57,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:28:57,179 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:28:57,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:28:57,180 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:28:57,181 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-10-27 15:28:57,183 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [19], [21], [28], [31], [33], [39], [40], [41], [43] [2018-10-27 15:28:57,218 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-10-27 15:28:57,218 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 15:28:57,309 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-27 15:28:57,478 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 15:28:57,479 INFO L272 AbstractInterpreter]: Visited 14 different actions 77 times. Merged at 5 different actions 35 times. Widened at 1 different actions 3 times. Found 1 fixpoints after 1 different actions. Largest state had 5 variables. [2018-10-27 15:28:57,497 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:28:57,498 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 15:28:57,499 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:28:57,499 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:28:57,520 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:28:57,521 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:28:57,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:28:57,564 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:28:57,706 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:28:57,706 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:28:58,033 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:28:58,055 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:28:58,056 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-27 15:28:58,056 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:28:58,056 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 15:28:58,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 15:28:58,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2018-10-27 15:28:58,057 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 6 states. [2018-10-27 15:28:58,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:28:58,165 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2018-10-27 15:28:58,166 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-27 15:28:58,166 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2018-10-27 15:28:58,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:28:58,167 INFO L225 Difference]: With dead ends: 34 [2018-10-27 15:28:58,167 INFO L226 Difference]: Without dead ends: 22 [2018-10-27 15:28:58,168 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-10-27 15:28:58,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-27 15:28:58,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-10-27 15:28:58,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-27 15:28:58,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-10-27 15:28:58,174 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 15 [2018-10-27 15:28:58,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:28:58,174 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-10-27 15:28:58,175 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 15:28:58,175 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-10-27 15:28:58,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-27 15:28:58,176 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:28:58,176 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:28:58,176 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:28:58,176 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:28:58,177 INFO L82 PathProgramCache]: Analyzing trace with hash 452778096, now seen corresponding path program 2 times [2018-10-27 15:28:58,177 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:28:58,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:28:58,178 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:28:58,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:28:58,178 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:28:58,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:28:58,416 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:28:58,416 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:28:58,416 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:28:58,417 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:28:58,417 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:28:58,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:28:58,417 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:28:58,431 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:28:58,431 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:28:58,447 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 15:28:58,447 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:28:58,449 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:28:58,520 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:28:58,520 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:28:58,815 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:28:58,838 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:28:58,838 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 8] total 13 [2018-10-27 15:28:58,838 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:28:58,839 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-27 15:28:58,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-27 15:28:58,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-10-27 15:28:58,840 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2018-10-27 15:28:59,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:28:59,236 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2018-10-27 15:28:59,236 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 15:28:59,237 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-10-27 15:28:59,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:28:59,238 INFO L225 Difference]: With dead ends: 42 [2018-10-27 15:28:59,238 INFO L226 Difference]: Without dead ends: 26 [2018-10-27 15:28:59,239 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2018-10-27 15:28:59,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-27 15:28:59,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2018-10-27 15:28:59,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-27 15:28:59,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2018-10-27 15:28:59,244 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 19 [2018-10-27 15:28:59,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:28:59,244 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2018-10-27 15:28:59,244 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-27 15:28:59,245 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2018-10-27 15:28:59,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-27 15:28:59,245 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:28:59,246 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:28:59,246 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:28:59,246 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:28:59,246 INFO L82 PathProgramCache]: Analyzing trace with hash -137838632, now seen corresponding path program 3 times [2018-10-27 15:28:59,246 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:28:59,247 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:28:59,248 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:28:59,248 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:28:59,248 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:28:59,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:28:59,464 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:28:59,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:28:59,465 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:28:59,465 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:28:59,465 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:28:59,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:28:59,466 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:28:59,475 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:28:59,475 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:28:59,489 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:28:59,490 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:28:59,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:28:59,515 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:28:59,516 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:28:59,687 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:28:59,707 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:28:59,708 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-27 15:28:59,708 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:28:59,708 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 15:28:59,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 15:28:59,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2018-10-27 15:28:59,709 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 8 states. [2018-10-27 15:28:59,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:28:59,854 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2018-10-27 15:28:59,858 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 15:28:59,859 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2018-10-27 15:28:59,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:28:59,860 INFO L225 Difference]: With dead ends: 50 [2018-10-27 15:28:59,860 INFO L226 Difference]: Without dead ends: 30 [2018-10-27 15:28:59,861 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2018-10-27 15:28:59,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-27 15:28:59,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-10-27 15:28:59,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-27 15:28:59,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2018-10-27 15:28:59,867 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 23 [2018-10-27 15:28:59,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:28:59,867 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2018-10-27 15:28:59,867 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 15:28:59,867 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2018-10-27 15:28:59,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-27 15:28:59,868 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:28:59,868 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:28:59,869 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:28:59,869 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:28:59,869 INFO L82 PathProgramCache]: Analyzing trace with hash 872592192, now seen corresponding path program 4 times [2018-10-27 15:28:59,869 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:28:59,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:28:59,871 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:28:59,871 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:28:59,871 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:28:59,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:29:00,040 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:29:00,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:29:00,041 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:29:00,041 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:29:00,041 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:29:00,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:29:00,041 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:29:00,049 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:29:00,049 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:29:00,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:29:00,076 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:29:00,137 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:29:00,138 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:29:00,348 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:29:00,370 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:29:00,370 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-27 15:29:00,370 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:29:00,370 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 15:29:00,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 15:29:00,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2018-10-27 15:29:00,372 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2018-10-27 15:29:00,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:29:00,456 INFO L93 Difference]: Finished difference Result 48 states and 51 transitions. [2018-10-27 15:29:00,456 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 15:29:00,457 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2018-10-27 15:29:00,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:29:00,457 INFO L225 Difference]: With dead ends: 48 [2018-10-27 15:29:00,458 INFO L226 Difference]: Without dead ends: 0 [2018-10-27 15:29:00,459 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2018-10-27 15:29:00,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-10-27 15:29:00,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-10-27 15:29:00,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-10-27 15:29:00,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-10-27 15:29:00,460 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 27 [2018-10-27 15:29:00,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:29:00,460 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-10-27 15:29:00,460 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 15:29:00,461 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-10-27 15:29:00,461 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-10-27 15:29:00,465 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-10-27 15:29:00,602 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-10-27 15:29:00,602 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-10-27 15:29:00,602 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-10-27 15:29:00,602 INFO L428 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-10-27 15:29:00,602 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-10-27 15:29:00,603 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-10-27 15:29:00,603 INFO L428 ceAbstractionStarter]: At program point mainENTRY(lines 9 21) the Hoare annotation is: true [2018-10-27 15:29:00,603 INFO L425 ceAbstractionStarter]: For program point mainEXIT(lines 9 21) no Hoare annotation was computed. [2018-10-27 15:29:00,603 INFO L425 ceAbstractionStarter]: For program point L19(line 19) no Hoare annotation was computed. [2018-10-27 15:29:00,603 INFO L425 ceAbstractionStarter]: For program point L14(lines 14 15) no Hoare annotation was computed. [2018-10-27 15:29:00,603 INFO L425 ceAbstractionStarter]: For program point mainFINAL(lines 9 21) no Hoare annotation was computed. [2018-10-27 15:29:00,603 INFO L425 ceAbstractionStarter]: For program point L13-1(lines 13 18) no Hoare annotation was computed. [2018-10-27 15:29:00,604 INFO L425 ceAbstractionStarter]: For program point L14-2(lines 14 15) no Hoare annotation was computed. [2018-10-27 15:29:00,604 INFO L421 ceAbstractionStarter]: At program point L13-3(lines 13 18) the Hoare annotation is: (or (and (<= main_~len~0 0) (<= 0 main_~len~0)) (and (<= 4 main_~len~0) (<= main_~len~0 4)) (and (<= main_~len~0 2) (<= 2 main_~len~0)) (and (<= 1 main_~len~0) (<= main_~len~0 1)) (and (<= main_~len~0 3) (<= 3 main_~len~0))) [2018-10-27 15:29:00,604 INFO L421 ceAbstractionStarter]: At program point L13-4(lines 13 18) the Hoare annotation is: (or (and (<= main_~len~0 0) (<= 0 main_~len~0)) (and (<= 4 main_~len~0) (<= main_~len~0 4)) (and (<= main_~len~0 2) (<= 2 main_~len~0)) (and (<= 1 main_~len~0) (<= main_~len~0 1)) (and (<= main_~len~0 3) (<= 3 main_~len~0))) [2018-10-27 15:29:00,604 INFO L425 ceAbstractionStarter]: For program point L3-2(lines 2 7) no Hoare annotation was computed. [2018-10-27 15:29:00,604 INFO L428 ceAbstractionStarter]: At program point __VERIFIER_assertENTRY(lines 2 7) the Hoare annotation is: true [2018-10-27 15:29:00,605 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertEXIT(lines 2 7) no Hoare annotation was computed. [2018-10-27 15:29:00,605 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 4) no Hoare annotation was computed. [2018-10-27 15:29:00,605 INFO L425 ceAbstractionStarter]: For program point L4(line 4) no Hoare annotation was computed. [2018-10-27 15:29:00,605 INFO L425 ceAbstractionStarter]: For program point L3(lines 3 5) no Hoare annotation was computed. [2018-10-27 15:29:00,618 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 03:29:00 BoogieIcfgContainer [2018-10-27 15:29:00,618 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-27 15:29:00,619 INFO L168 Benchmark]: Toolchain (without parser) took 5142.02 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 758.6 MB). Free memory was 1.4 GB in the beginning and 2.0 GB in the end (delta: -564.6 MB). Peak memory consumption was 194.1 MB. Max. memory is 7.1 GB. [2018-10-27 15:29:00,621 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 15:29:00,622 INFO L168 Benchmark]: CACSL2BoogieTranslator took 262.04 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-27 15:29:00,623 INFO L168 Benchmark]: Boogie Procedure Inliner took 19.22 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 15:29:00,623 INFO L168 Benchmark]: Boogie Preprocessor took 22.26 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 15:29:00,624 INFO L168 Benchmark]: RCFGBuilder took 349.82 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 758.6 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -811.6 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. [2018-10-27 15:29:00,625 INFO L168 Benchmark]: TraceAbstraction took 4482.05 ms. Allocated memory is still 2.3 GB. Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 236.5 MB). Peak memory consumption was 236.5 MB. Max. memory is 7.1 GB. [2018-10-27 15:29:00,630 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 262.04 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 19.22 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 22.26 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 349.82 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 758.6 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -811.6 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4482.05 ms. Allocated memory is still 2.3 GB. Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 236.5 MB). Peak memory consumption was 236.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 4]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 13]: Loop Invariant Derived loop invariant: ((((len <= 0 && 0 <= len) || (4 <= len && len <= 4)) || (len <= 2 && 2 <= len)) || (1 <= len && len <= 1)) || (len <= 3 && 3 <= len) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. SAFE Result, 4.3s OverallTime, 6 OverallIterations, 5 TraceHistogramMax, 0.9s AutomataDifference, 0.0s DeadEndRemovalTime, 0.1s HoareAnnotationTime, HoareTripleCheckerStatistics: 99 SDtfs, 14 SDslu, 336 SDs, 0 SdLazy, 220 SolverSat, 10 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 206 GetRequests, 144 SyntacticMatches, 9 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 2.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=29occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 4 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 17 PreInvPairs, 27 NumberOfFragments, 77 HoareAnnotationTreeSize, 17 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 2.3s InterpolantComputationTime, 189 NumberOfCodeBlocks, 189 NumberOfCodeBlocksAsserted, 13 NumberOfCheckSat, 259 ConstructedInterpolants, 0 QuantifiedInterpolants, 27141 SizeOfPredicates, 8 NumberOfNonLiveVariables, 156 ConjunctsInSsa, 53 ConjunctsInUnsatCore, 14 InterpolantComputations, 2 PerfectInterpolantSequences, 3/180 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...