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/nested_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-63daa26 [2018-11-12 20:31:34,682 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-12 20:31:34,684 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-12 20:31:34,704 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-12 20:31:34,704 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-12 20:31:34,705 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-12 20:31:34,707 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-12 20:31:34,708 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-12 20:31:34,710 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-12 20:31:34,711 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-12 20:31:34,712 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-12 20:31:34,712 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-12 20:31:34,713 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-12 20:31:34,714 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-12 20:31:34,715 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-12 20:31:34,716 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-12 20:31:34,717 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-12 20:31:34,719 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-12 20:31:34,721 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-12 20:31:34,722 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-12 20:31:34,723 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-12 20:31:34,725 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-12 20:31:34,727 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-12 20:31:34,727 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-12 20:31:34,728 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-12 20:31:34,729 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-12 20:31:34,730 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-12 20:31:34,730 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-12 20:31:34,731 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-12 20:31:34,732 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-12 20:31:34,733 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-12 20:31:34,733 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-11-12 20:31:34,736 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 [2018-11-12 20:31:34,765 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-12 20:31:34,765 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-12 20:31:34,766 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-12 20:31:34,767 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-12 20:31:34,767 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-12 20:31:34,767 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-12 20:31:34,767 INFO L133 SettingsManager]: * Maximum recursion depth of evaluation operations=6 [2018-11-12 20:31:34,767 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-12 20:31:34,767 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-12 20:31:34,768 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-12 20:31:34,768 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-12 20:31:34,768 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-12 20:31:34,768 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-12 20:31:34,769 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-12 20:31:34,769 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-12 20:31:34,769 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-12 20:31:34,769 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-12 20:31:34,770 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-12 20:31:34,771 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-12 20:31:34,771 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-12 20:31:34,771 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-12 20:31:34,771 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-12 20:31:34,771 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-12 20:31:34,772 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-12 20:31:34,772 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-12 20:31:34,772 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-12 20:31:34,773 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-12 20:31:34,773 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-12 20:31:34,773 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-12 20:31:34,773 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-12 20:31:34,773 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-12 20:31:34,773 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-12 20:31:34,774 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-12 20:31:34,774 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-12 20:31:34,774 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-12 20:31:34,836 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-12 20:31:34,848 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-12 20:31:34,851 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-12 20:31:34,853 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-12 20:31:34,853 INFO L276 PluginConnector]: CDTParser initialized [2018-11-12 20:31:34,854 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/nested_false-unreach-call1.i [2018-11-12 20:31:34,912 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cb7ca2f2b/cd4de7b3f869427ab956daea2ff221df/FLAGa3a8f6ddc [2018-11-12 20:31:35,360 INFO L298 CDTParser]: Found 1 translation units. [2018-11-12 20:31:35,360 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_false-unreach-call1.i [2018-11-12 20:31:35,366 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cb7ca2f2b/cd4de7b3f869427ab956daea2ff221df/FLAGa3a8f6ddc [2018-11-12 20:31:35,381 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cb7ca2f2b/cd4de7b3f869427ab956daea2ff221df [2018-11-12 20:31:35,392 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-12 20:31:35,394 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-12 20:31:35,395 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-12 20:31:35,395 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-12 20:31:35,398 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-12 20:31:35,399 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 08:31:35" (1/1) ... [2018-11-12 20:31:35,402 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4abd226b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:31:35, skipping insertion in model container [2018-11-12 20:31:35,402 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 08:31:35" (1/1) ... [2018-11-12 20:31:35,412 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-12 20:31:35,431 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-12 20:31:35,626 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-12 20:31:35,630 INFO L189 MainTranslator]: Completed pre-run [2018-11-12 20:31:35,649 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-12 20:31:35,669 INFO L193 MainTranslator]: Completed translation [2018-11-12 20:31:35,669 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:31:35 WrapperNode [2018-11-12 20:31:35,669 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-12 20:31:35,670 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-12 20:31:35,670 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-12 20:31:35,670 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-12 20:31:35,680 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:31:35" (1/1) ... [2018-11-12 20:31:35,687 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:31:35" (1/1) ... [2018-11-12 20:31:35,693 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-12 20:31:35,693 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-12 20:31:35,693 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-12 20:31:35,694 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-12 20:31:35,701 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:31:35" (1/1) ... [2018-11-12 20:31:35,701 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:31:35" (1/1) ... [2018-11-12 20:31:35,702 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:31:35" (1/1) ... [2018-11-12 20:31:35,702 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:31:35" (1/1) ... [2018-11-12 20:31:35,706 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:31:35" (1/1) ... [2018-11-12 20:31:35,711 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:31:35" (1/1) ... [2018-11-12 20:31:35,712 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:31:35" (1/1) ... [2018-11-12 20:31:35,714 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-12 20:31:35,714 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-12 20:31:35,714 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-12 20:31:35,714 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-12 20:31:35,715 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:31:35" (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 [2018-11-12 20:31:35,839 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-12 20:31:35,840 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-12 20:31:35,840 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-12 20:31:35,840 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-12 20:31:35,840 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-12 20:31:35,840 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-12 20:31:35,841 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-12 20:31:35,842 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-12 20:31:36,047 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-12 20:31:36,047 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 08:31:36 BoogieIcfgContainer [2018-11-12 20:31:36,048 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-12 20:31:36,051 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-12 20:31:36,051 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-12 20:31:36,055 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-12 20:31:36,056 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 08:31:35" (1/3) ... [2018-11-12 20:31:36,056 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b5a5a8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 08:31:36, skipping insertion in model container [2018-11-12 20:31:36,057 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 08:31:35" (2/3) ... [2018-11-12 20:31:36,057 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b5a5a8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 08:31:36, skipping insertion in model container [2018-11-12 20:31:36,057 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 08:31:36" (3/3) ... [2018-11-12 20:31:36,059 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_false-unreach-call1.i [2018-11-12 20:31:36,067 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-12 20:31:36,073 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-12 20:31:36,087 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-12 20:31:36,118 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-12 20:31:36,119 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-12 20:31:36,119 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-12 20:31:36,119 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-12 20:31:36,119 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-12 20:31:36,119 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-12 20:31:36,120 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-12 20:31:36,120 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-12 20:31:36,138 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-11-12 20:31:36,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-12 20:31:36,144 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:31:36,145 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:31:36,147 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:31:36,153 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:31:36,154 INFO L82 PathProgramCache]: Analyzing trace with hash -283544510, now seen corresponding path program 1 times [2018-11-12 20:31:36,157 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:31:36,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:36,210 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:31:36,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:36,211 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:31:36,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:31:36,274 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:31:36,276 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-12 20:31:36,276 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-12 20:31:36,277 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-12 20:31:36,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-12 20:31:36,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-12 20:31:36,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-12 20:31:36,297 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-11-12 20:31:36,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:31:36,319 INFO L93 Difference]: Finished difference Result 37 states and 46 transitions. [2018-11-12 20:31:36,319 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-12 20:31:36,320 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-11-12 20:31:36,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:31:36,330 INFO L225 Difference]: With dead ends: 37 [2018-11-12 20:31:36,330 INFO L226 Difference]: Without dead ends: 15 [2018-11-12 20:31:36,334 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 [2018-11-12 20:31:36,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-11-12 20:31:36,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-11-12 20:31:36,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-11-12 20:31:36,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-11-12 20:31:36,376 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2018-11-12 20:31:36,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:31:36,377 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-11-12 20:31:36,377 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-12 20:31:36,377 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-11-12 20:31:36,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-12 20:31:36,378 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:31:36,378 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:31:36,379 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:31:36,379 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:31:36,379 INFO L82 PathProgramCache]: Analyzing trace with hash -863512858, now seen corresponding path program 1 times [2018-11-12 20:31:36,379 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:31:36,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:36,381 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:31:36,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:36,381 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:31:36,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:31:36,497 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:31:36,498 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-12 20:31:36,498 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-12 20:31:36,498 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-12 20:31:36,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-12 20:31:36,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-12 20:31:36,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-12 20:31:36,501 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 3 states. [2018-11-12 20:31:36,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:31:36,574 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2018-11-12 20:31:36,575 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-12 20:31:36,576 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-11-12 20:31:36,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:31:36,577 INFO L225 Difference]: With dead ends: 25 [2018-11-12 20:31:36,577 INFO L226 Difference]: Without dead ends: 20 [2018-11-12 20:31:36,578 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 [2018-11-12 20:31:36,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-11-12 20:31:36,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2018-11-12 20:31:36,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-11-12 20:31:36,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-11-12 20:31:36,584 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 11 [2018-11-12 20:31:36,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:31:36,585 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2018-11-12 20:31:36,585 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-12 20:31:36,585 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2018-11-12 20:31:36,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-11-12 20:31:36,586 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:31:36,587 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:31:36,587 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:31:36,587 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:31:36,588 INFO L82 PathProgramCache]: Analyzing trace with hash -1427803270, now seen corresponding path program 1 times [2018-11-12 20:31:36,588 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:31:36,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:36,589 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:31:36,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:36,590 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:31:36,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:31:36,720 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:31:36,720 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-12 20:31:36,721 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-12 20:31:36,721 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-12 20:31:36,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-12 20:31:36,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-12 20:31:36,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-12 20:31:36,722 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 3 states. [2018-11-12 20:31:36,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:31:36,760 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-11-12 20:31:36,761 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-12 20:31:36,761 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2018-11-12 20:31:36,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:31:36,763 INFO L225 Difference]: With dead ends: 29 [2018-11-12 20:31:36,763 INFO L226 Difference]: Without dead ends: 19 [2018-11-12 20:31:36,764 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-12 20:31:36,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-11-12 20:31:36,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-11-12 20:31:36,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-11-12 20:31:36,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-11-12 20:31:36,770 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2018-11-12 20:31:36,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:31:36,770 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-11-12 20:31:36,770 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-12 20:31:36,770 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-11-12 20:31:36,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-11-12 20:31:36,771 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:31:36,771 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:31:36,772 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:31:36,772 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:31:36,772 INFO L82 PathProgramCache]: Analyzing trace with hash 1523179828, now seen corresponding path program 1 times [2018-11-12 20:31:36,773 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:31:36,774 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:36,774 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:31:36,774 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:36,775 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:31:36,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:31:36,923 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:31:36,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:31:36,923 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:31:36,924 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-11-12 20:31:36,926 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [18], [22], [24], [28], [34], [37], [39], [45], [46], [47], [49] [2018-11-12 20:31:36,959 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-12 20:31:36,960 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-12 20:31:37,055 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-12 20:31:37,340 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-12 20:31:37,343 INFO L272 AbstractInterpreter]: Visited 16 different actions 109 times. Merged at 7 different actions 57 times. Widened at 3 different actions 12 times. Performed 286 root evaluator evaluations with a maximum evaluation depth of 6. Performed 286 inverse root evaluator evaluations with a maximum inverse evaluation depth of 6. Found 12 fixpoints after 3 different actions. Largest state had 4 variables. [2018-11-12 20:31:37,394 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:31:37,395 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-12 20:31:37,396 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:31:37,396 INFO L192 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 [2018-11-12 20:31:37,408 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:31:37,408 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-12 20:31:37,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:31:37,432 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:31:37,512 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-12 20:31:37,512 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:31:37,714 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-12 20:31:37,748 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:31:37,748 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 4] total 9 [2018-11-12 20:31:37,749 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:31:37,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-12 20:31:37,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-12 20:31:37,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2018-11-12 20:31:37,750 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 7 states. [2018-11-12 20:31:37,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:31:37,990 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2018-11-12 20:31:37,991 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-12 20:31:37,991 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2018-11-12 20:31:37,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:31:37,992 INFO L225 Difference]: With dead ends: 49 [2018-11-12 20:31:37,993 INFO L226 Difference]: Without dead ends: 37 [2018-11-12 20:31:37,993 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2018-11-12 20:31:37,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-11-12 20:31:37,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2018-11-12 20:31:37,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-12 20:31:38,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2018-11-12 20:31:38,001 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 18 [2018-11-12 20:31:38,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:31:38,001 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2018-11-12 20:31:38,001 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-12 20:31:38,002 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2018-11-12 20:31:38,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-11-12 20:31:38,003 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:31:38,003 INFO L375 BasicCegarLoop]: trace histogram [6, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:31:38,003 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:31:38,003 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:31:38,004 INFO L82 PathProgramCache]: Analyzing trace with hash -1070919706, now seen corresponding path program 2 times [2018-11-12 20:31:38,004 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:31:38,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:38,005 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:31:38,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:38,005 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:31:38,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:31:38,107 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-11-12 20:31:38,107 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:31:38,108 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:31:38,110 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:31:38,110 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:31:38,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:31:38,110 INFO L192 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 [2018-11-12 20:31:38,122 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-12 20:31:38,122 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-12 20:31:38,137 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-12 20:31:38,138 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:31:38,140 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:31:38,329 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-12 20:31:38,330 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:31:38,469 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-12 20:31:38,492 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:31:38,492 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 11 [2018-11-12 20:31:38,492 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:31:38,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-12 20:31:38,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-12 20:31:38,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2018-11-12 20:31:38,494 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 8 states. [2018-11-12 20:31:39,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:31:39,114 INFO L93 Difference]: Finished difference Result 71 states and 81 transitions. [2018-11-12 20:31:39,115 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-12 20:31:39,115 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2018-11-12 20:31:39,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:31:39,116 INFO L225 Difference]: With dead ends: 71 [2018-11-12 20:31:39,116 INFO L226 Difference]: Without dead ends: 54 [2018-11-12 20:31:39,117 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2018-11-12 20:31:39,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-11-12 20:31:39,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 45. [2018-11-12 20:31:39,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-11-12 20:31:39,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2018-11-12 20:31:39,127 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 29 [2018-11-12 20:31:39,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:31:39,128 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2018-11-12 20:31:39,128 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-12 20:31:39,128 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2018-11-12 20:31:39,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-11-12 20:31:39,129 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:31:39,130 INFO L375 BasicCegarLoop]: trace histogram [12, 9, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:31:39,130 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:31:39,130 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:31:39,130 INFO L82 PathProgramCache]: Analyzing trace with hash 1068904040, now seen corresponding path program 3 times [2018-11-12 20:31:39,130 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:31:39,131 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:39,132 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:31:39,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:39,132 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:31:39,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:31:39,373 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 70 proven. 12 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-11-12 20:31:39,374 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:31:39,374 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:31:39,374 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:31:39,374 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:31:39,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:31:39,375 INFO L192 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 [2018-11-12 20:31:39,392 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-12 20:31:39,392 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-12 20:31:39,409 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-12 20:31:39,410 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:31:39,413 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:31:39,575 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 0 proven. 123 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-12 20:31:39,575 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:31:39,760 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-12 20:31:39,780 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:31:39,780 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 6] total 17 [2018-11-12 20:31:39,780 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:31:39,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-12 20:31:39,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-12 20:31:39,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=207, Unknown=0, NotChecked=0, Total=272 [2018-11-12 20:31:39,782 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand 13 states. [2018-11-12 20:31:40,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:31:40,416 INFO L93 Difference]: Finished difference Result 105 states and 118 transitions. [2018-11-12 20:31:40,420 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-12 20:31:40,420 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 44 [2018-11-12 20:31:40,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:31:40,421 INFO L225 Difference]: With dead ends: 105 [2018-11-12 20:31:40,422 INFO L226 Difference]: Without dead ends: 75 [2018-11-12 20:31:40,425 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=169, Invalid=701, Unknown=0, NotChecked=0, Total=870 [2018-11-12 20:31:40,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-11-12 20:31:40,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 64. [2018-11-12 20:31:40,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-11-12 20:31:40,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 68 transitions. [2018-11-12 20:31:40,440 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 68 transitions. Word has length 44 [2018-11-12 20:31:40,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:31:40,440 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 68 transitions. [2018-11-12 20:31:40,442 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-12 20:31:40,443 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 68 transitions. [2018-11-12 20:31:40,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-11-12 20:31:40,444 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:31:40,445 INFO L375 BasicCegarLoop]: trace histogram [20, 16, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:31:40,445 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:31:40,445 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:31:40,445 INFO L82 PathProgramCache]: Analyzing trace with hash 46746086, now seen corresponding path program 4 times [2018-11-12 20:31:40,449 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:31:40,450 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:40,450 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:31:40,450 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:40,451 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:31:40,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:31:40,677 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 326 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2018-11-12 20:31:40,677 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:31:40,677 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:31:40,677 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:31:40,677 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:31:40,677 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:31:40,678 INFO L192 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 [2018-11-12 20:31:40,686 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:31:40,686 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-12 20:31:40,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:31:40,712 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:31:40,829 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 346 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-12 20:31:40,829 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:31:40,964 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 326 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2018-11-12 20:31:40,984 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:31:40,984 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11, 7] total 16 [2018-11-12 20:31:40,984 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:31:40,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-12 20:31:40,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-12 20:31:40,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-11-12 20:31:40,987 INFO L87 Difference]: Start difference. First operand 64 states and 68 transitions. Second operand 11 states. [2018-11-12 20:31:41,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:31:41,197 INFO L93 Difference]: Finished difference Result 93 states and 99 transitions. [2018-11-12 20:31:41,199 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-12 20:31:41,200 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 63 [2018-11-12 20:31:41,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:31:41,201 INFO L225 Difference]: With dead ends: 93 [2018-11-12 20:31:41,201 INFO L226 Difference]: Without dead ends: 88 [2018-11-12 20:31:41,202 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 117 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-11-12 20:31:41,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-11-12 20:31:41,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 77. [2018-11-12 20:31:41,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-11-12 20:31:41,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 82 transitions. [2018-11-12 20:31:41,215 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 82 transitions. Word has length 63 [2018-11-12 20:31:41,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:31:41,216 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 82 transitions. [2018-11-12 20:31:41,216 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-12 20:31:41,216 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 82 transitions. [2018-11-12 20:31:41,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-11-12 20:31:41,218 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:31:41,218 INFO L375 BasicCegarLoop]: trace histogram [25, 20, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:31:41,218 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:31:41,218 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:31:41,219 INFO L82 PathProgramCache]: Analyzing trace with hash -742133662, now seen corresponding path program 5 times [2018-11-12 20:31:41,219 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:31:41,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:41,220 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:31:41,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:41,220 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:31:41,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:31:41,541 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 0 proven. 540 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-11-12 20:31:41,542 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:31:41,542 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:31:41,542 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:31:41,542 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:31:41,542 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:31:41,543 INFO L192 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 [2018-11-12 20:31:41,554 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-12 20:31:41,554 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-12 20:31:41,647 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-12 20:31:41,647 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:31:41,653 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:31:41,759 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 214 proven. 20 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2018-11-12 20:31:41,759 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:31:41,869 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 214 proven. 20 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2018-11-12 20:31:41,889 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:31:41,889 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 18 [2018-11-12 20:31:41,889 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:31:41,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-12 20:31:41,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-12 20:31:41,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2018-11-12 20:31:41,891 INFO L87 Difference]: Start difference. First operand 77 states and 82 transitions. Second operand 13 states. [2018-11-12 20:31:42,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:31:42,933 INFO L93 Difference]: Finished difference Result 175 states and 194 transitions. [2018-11-12 20:31:42,933 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-11-12 20:31:42,933 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 76 [2018-11-12 20:31:42,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:31:42,935 INFO L225 Difference]: With dead ends: 175 [2018-11-12 20:31:42,935 INFO L226 Difference]: Without dead ends: 115 [2018-11-12 20:31:42,937 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 143 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=328, Invalid=1928, Unknown=0, NotChecked=0, Total=2256 [2018-11-12 20:31:42,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-11-12 20:31:42,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 102. [2018-11-12 20:31:42,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-11-12 20:31:42,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 108 transitions. [2018-11-12 20:31:42,952 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 108 transitions. Word has length 76 [2018-11-12 20:31:42,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:31:42,953 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 108 transitions. [2018-11-12 20:31:42,953 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-12 20:31:42,953 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 108 transitions. [2018-11-12 20:31:42,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-11-12 20:31:42,955 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:31:42,955 INFO L375 BasicCegarLoop]: trace histogram [36, 30, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:31:42,955 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:31:42,955 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:31:42,956 INFO L82 PathProgramCache]: Analyzing trace with hash -1798689114, now seen corresponding path program 6 times [2018-11-12 20:31:42,956 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:31:42,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:42,957 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:31:42,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:42,957 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:31:42,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:31:43,614 INFO L134 CoverageAnalysis]: Checked inductivity of 1317 backedges. 0 proven. 1137 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-12 20:31:43,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:31:43,615 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:31:43,615 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:31:43,615 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:31:43,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:31:43,616 INFO L192 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 [2018-11-12 20:31:43,624 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-12 20:31:43,624 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-12 20:31:43,673 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-12 20:31:43,673 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:31:43,682 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:31:43,997 INFO L134 CoverageAnalysis]: Checked inductivity of 1317 backedges. 676 proven. 30 refuted. 0 times theorem prover too weak. 611 trivial. 0 not checked. [2018-11-12 20:31:43,997 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:31:44,156 INFO L134 CoverageAnalysis]: Checked inductivity of 1317 backedges. 676 proven. 30 refuted. 0 times theorem prover too weak. 611 trivial. 0 not checked. [2018-11-12 20:31:44,178 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:31:44,178 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 21 [2018-11-12 20:31:44,178 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:31:44,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-12 20:31:44,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-12 20:31:44,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=346, Unknown=0, NotChecked=0, Total=420 [2018-11-12 20:31:44,179 INFO L87 Difference]: Start difference. First operand 102 states and 108 transitions. Second operand 15 states. [2018-11-12 20:31:44,494 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-11-12 20:31:45,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:31:45,598 INFO L93 Difference]: Finished difference Result 229 states and 251 transitions. [2018-11-12 20:31:45,599 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-11-12 20:31:45,599 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 101 [2018-11-12 20:31:45,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:31:45,600 INFO L225 Difference]: With dead ends: 229 [2018-11-12 20:31:45,600 INFO L226 Difference]: Without dead ends: 146 [2018-11-12 20:31:45,602 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 191 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 866 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=487, Invalid=3419, Unknown=0, NotChecked=0, Total=3906 [2018-11-12 20:31:45,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2018-11-12 20:31:45,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 131. [2018-11-12 20:31:45,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-11-12 20:31:45,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 138 transitions. [2018-11-12 20:31:45,621 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 138 transitions. Word has length 101 [2018-11-12 20:31:45,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:31:45,622 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 138 transitions. [2018-11-12 20:31:45,622 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-12 20:31:45,622 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 138 transitions. [2018-11-12 20:31:45,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2018-11-12 20:31:45,624 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:31:45,624 INFO L375 BasicCegarLoop]: trace histogram [49, 42, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:31:45,624 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:31:45,625 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:31:45,625 INFO L82 PathProgramCache]: Analyzing trace with hash 778877526, now seen corresponding path program 7 times [2018-11-12 20:31:45,625 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:31:45,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:45,626 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:31:45,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:45,626 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:31:45,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:31:46,162 INFO L134 CoverageAnalysis]: Checked inductivity of 2429 backedges. 0 proven. 2135 refuted. 0 times theorem prover too weak. 294 trivial. 0 not checked. [2018-11-12 20:31:46,163 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:31:46,163 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:31:46,163 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:31:46,163 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:31:46,163 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:31:46,163 INFO L192 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 [2018-11-12 20:31:46,176 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:31:46,177 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-12 20:31:46,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:31:46,233 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:31:46,492 INFO L134 CoverageAnalysis]: Checked inductivity of 2429 backedges. 602 proven. 42 refuted. 0 times theorem prover too weak. 1785 trivial. 0 not checked. [2018-11-12 20:31:46,492 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:31:46,769 INFO L134 CoverageAnalysis]: Checked inductivity of 2429 backedges. 602 proven. 42 refuted. 0 times theorem prover too weak. 1785 trivial. 0 not checked. [2018-11-12 20:31:46,791 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:31:46,791 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 24 [2018-11-12 20:31:46,791 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:31:46,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-12 20:31:46,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-12 20:31:46,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=464, Unknown=0, NotChecked=0, Total=552 [2018-11-12 20:31:46,793 INFO L87 Difference]: Start difference. First operand 131 states and 138 transitions. Second operand 17 states. [2018-11-12 20:31:49,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:31:49,280 INFO L93 Difference]: Finished difference Result 291 states and 316 transitions. [2018-11-12 20:31:49,280 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-11-12 20:31:49,280 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 130 [2018-11-12 20:31:49,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:31:49,281 INFO L225 Difference]: With dead ends: 291 [2018-11-12 20:31:49,281 INFO L226 Difference]: Without dead ends: 181 [2018-11-12 20:31:49,285 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 248 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1555 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=656, Invalid=5664, Unknown=0, NotChecked=0, Total=6320 [2018-11-12 20:31:49,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-11-12 20:31:49,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 164. [2018-11-12 20:31:49,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2018-11-12 20:31:49,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 172 transitions. [2018-11-12 20:31:49,305 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 172 transitions. Word has length 130 [2018-11-12 20:31:49,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:31:49,305 INFO L480 AbstractCegarLoop]: Abstraction has 164 states and 172 transitions. [2018-11-12 20:31:49,305 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-12 20:31:49,305 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 172 transitions. [2018-11-12 20:31:49,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2018-11-12 20:31:49,308 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:31:49,308 INFO L375 BasicCegarLoop]: trace histogram [64, 56, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:31:49,308 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:31:49,308 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:31:49,308 INFO L82 PathProgramCache]: Analyzing trace with hash 402761190, now seen corresponding path program 8 times [2018-11-12 20:31:49,309 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:31:49,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:49,310 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:31:49,310 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:49,310 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:31:49,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:31:50,048 INFO L134 CoverageAnalysis]: Checked inductivity of 4132 backedges. 0 proven. 3684 refuted. 0 times theorem prover too weak. 448 trivial. 0 not checked. [2018-11-12 20:31:50,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:31:50,049 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:31:50,049 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:31:50,049 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:31:50,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:31:50,049 INFO L192 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 [2018-11-12 20:31:50,061 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-12 20:31:50,061 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-12 20:31:50,187 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-12 20:31:50,187 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:31:50,192 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:31:50,326 INFO L134 CoverageAnalysis]: Checked inductivity of 4132 backedges. 919 proven. 56 refuted. 0 times theorem prover too weak. 3157 trivial. 0 not checked. [2018-11-12 20:31:50,326 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:31:51,163 INFO L134 CoverageAnalysis]: Checked inductivity of 4132 backedges. 919 proven. 56 refuted. 0 times theorem prover too weak. 3157 trivial. 0 not checked. [2018-11-12 20:31:51,183 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:31:51,183 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 27 [2018-11-12 20:31:51,184 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:31:51,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-12 20:31:51,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-12 20:31:51,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=596, Unknown=0, NotChecked=0, Total=702 [2018-11-12 20:31:51,186 INFO L87 Difference]: Start difference. First operand 164 states and 172 transitions. Second operand 19 states. [2018-11-12 20:31:53,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:31:53,523 INFO L93 Difference]: Finished difference Result 361 states and 389 transitions. [2018-11-12 20:31:53,523 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-11-12 20:31:53,523 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 163 [2018-11-12 20:31:53,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:31:53,524 INFO L225 Difference]: With dead ends: 361 [2018-11-12 20:31:53,525 INFO L226 Difference]: Without dead ends: 220 [2018-11-12 20:31:53,528 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 311 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2581 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=889, Invalid=8813, Unknown=0, NotChecked=0, Total=9702 [2018-11-12 20:31:53,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-11-12 20:31:53,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 201. [2018-11-12 20:31:53,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2018-11-12 20:31:53,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 210 transitions. [2018-11-12 20:31:53,551 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 210 transitions. Word has length 163 [2018-11-12 20:31:53,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:31:53,551 INFO L480 AbstractCegarLoop]: Abstraction has 201 states and 210 transitions. [2018-11-12 20:31:53,551 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-12 20:31:53,552 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 210 transitions. [2018-11-12 20:31:53,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2018-11-12 20:31:53,554 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:31:53,554 INFO L375 BasicCegarLoop]: trace histogram [81, 72, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:31:53,555 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:31:53,555 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:31:53,555 INFO L82 PathProgramCache]: Analyzing trace with hash -1591963318, now seen corresponding path program 9 times [2018-11-12 20:31:53,555 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:31:53,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:53,556 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:31:53,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:53,556 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:31:53,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:31:53,950 INFO L134 CoverageAnalysis]: Checked inductivity of 6606 backedges. 0 proven. 5958 refuted. 0 times theorem prover too weak. 648 trivial. 0 not checked. [2018-11-12 20:31:53,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:31:53,951 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:31:53,951 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:31:53,951 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:31:53,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:31:53,951 INFO L192 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 [2018-11-12 20:31:53,960 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-12 20:31:53,961 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-12 20:31:54,020 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-12 20:31:54,020 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:31:54,024 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:31:54,174 INFO L134 CoverageAnalysis]: Checked inductivity of 6606 backedges. 3794 proven. 72 refuted. 0 times theorem prover too weak. 2740 trivial. 0 not checked. [2018-11-12 20:31:54,174 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:31:54,410 INFO L134 CoverageAnalysis]: Checked inductivity of 6606 backedges. 3794 proven. 72 refuted. 0 times theorem prover too weak. 2740 trivial. 0 not checked. [2018-11-12 20:31:54,429 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:31:54,430 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 30 [2018-11-12 20:31:54,430 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:31:54,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-12 20:31:54,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-12 20:31:54,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=760, Unknown=0, NotChecked=0, Total=870 [2018-11-12 20:31:54,432 INFO L87 Difference]: Start difference. First operand 201 states and 210 transitions. Second operand 21 states. [2018-11-12 20:31:56,396 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-11-12 20:31:58,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:31:58,552 INFO L93 Difference]: Finished difference Result 439 states and 470 transitions. [2018-11-12 20:31:58,552 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2018-11-12 20:31:58,552 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 200 [2018-11-12 20:31:58,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:31:58,554 INFO L225 Difference]: With dead ends: 439 [2018-11-12 20:31:58,554 INFO L226 Difference]: Without dead ends: 263 [2018-11-12 20:31:58,558 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 383 SyntacticMatches, 1 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4040 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1000, Invalid=13280, Unknown=0, NotChecked=0, Total=14280 [2018-11-12 20:31:58,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2018-11-12 20:31:58,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 242. [2018-11-12 20:31:58,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2018-11-12 20:31:58,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 252 transitions. [2018-11-12 20:31:58,581 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 252 transitions. Word has length 200 [2018-11-12 20:31:58,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:31:58,582 INFO L480 AbstractCegarLoop]: Abstraction has 242 states and 252 transitions. [2018-11-12 20:31:58,582 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-12 20:31:58,582 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 252 transitions. [2018-11-12 20:31:58,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2018-11-12 20:31:58,585 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:31:58,585 INFO L375 BasicCegarLoop]: trace histogram [100, 90, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:31:58,586 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:31:58,586 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:31:58,586 INFO L82 PathProgramCache]: Analyzing trace with hash 820866598, now seen corresponding path program 10 times [2018-11-12 20:31:58,586 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:31:58,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:58,587 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:31:58,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:31:58,587 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:31:58,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:31:59,056 INFO L134 CoverageAnalysis]: Checked inductivity of 10055 backedges. 0 proven. 9155 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2018-11-12 20:31:59,056 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:31:59,056 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:31:59,056 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:31:59,056 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:31:59,056 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:31:59,057 INFO L192 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 [2018-11-12 20:31:59,065 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:31:59,065 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-12 20:31:59,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:31:59,139 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:31:59,329 INFO L134 CoverageAnalysis]: Checked inductivity of 10055 backedges. 1820 proven. 90 refuted. 0 times theorem prover too weak. 8145 trivial. 0 not checked. [2018-11-12 20:31:59,330 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:31:59,658 INFO L134 CoverageAnalysis]: Checked inductivity of 10055 backedges. 1820 proven. 90 refuted. 0 times theorem prover too weak. 8145 trivial. 0 not checked. [2018-11-12 20:31:59,679 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:31:59,680 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 33 [2018-11-12 20:31:59,680 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:31:59,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-12 20:31:59,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-12 20:31:59,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=938, Unknown=0, NotChecked=0, Total=1056 [2018-11-12 20:31:59,681 INFO L87 Difference]: Start difference. First operand 242 states and 252 transitions. Second operand 23 states. [2018-11-12 20:32:03,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:32:03,726 INFO L93 Difference]: Finished difference Result 525 states and 559 transitions. [2018-11-12 20:32:03,727 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2018-11-12 20:32:03,727 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 241 [2018-11-12 20:32:03,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:32:03,729 INFO L225 Difference]: With dead ends: 525 [2018-11-12 20:32:03,729 INFO L226 Difference]: Without dead ends: 310 [2018-11-12 20:32:03,737 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 606 GetRequests, 464 SyntacticMatches, 1 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6040 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1163, Invalid=19143, Unknown=0, NotChecked=0, Total=20306 [2018-11-12 20:32:03,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2018-11-12 20:32:03,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 287. [2018-11-12 20:32:03,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2018-11-12 20:32:03,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 298 transitions. [2018-11-12 20:32:03,762 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 298 transitions. Word has length 241 [2018-11-12 20:32:03,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:32:03,762 INFO L480 AbstractCegarLoop]: Abstraction has 287 states and 298 transitions. [2018-11-12 20:32:03,762 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-12 20:32:03,762 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 298 transitions. [2018-11-12 20:32:03,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2018-11-12 20:32:03,766 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:32:03,766 INFO L375 BasicCegarLoop]: trace histogram [121, 110, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:32:03,766 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:32:03,766 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:32:03,767 INFO L82 PathProgramCache]: Analyzing trace with hash -1520240322, now seen corresponding path program 11 times [2018-11-12 20:32:03,767 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:32:03,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:32:03,768 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:32:03,768 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:32:03,768 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:32:03,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:32:04,174 INFO L134 CoverageAnalysis]: Checked inductivity of 14707 backedges. 0 proven. 13497 refuted. 0 times theorem prover too weak. 1210 trivial. 0 not checked. [2018-11-12 20:32:04,175 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:32:04,175 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:32:04,175 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:32:04,175 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:32:04,175 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:32:04,175 INFO L192 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 [2018-11-12 20:32:04,186 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-12 20:32:04,186 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-12 20:32:10,539 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2018-11-12 20:32:10,539 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:32:10,658 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:32:10,970 INFO L134 CoverageAnalysis]: Checked inductivity of 14707 backedges. 0 proven. 13577 refuted. 0 times theorem prover too weak. 1130 trivial. 0 not checked. [2018-11-12 20:32:10,970 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:32:27,171 INFO L134 CoverageAnalysis]: Checked inductivity of 14707 backedges. 60 proven. 13272 refuted. 245 times theorem prover too weak. 1130 trivial. 0 not checked. [2018-11-12 20:32:27,202 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:32:27,202 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 19, 20] total 37 [2018-11-12 20:32:27,202 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:32:27,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-12 20:32:27,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-12 20:32:27,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=388, Invalid=939, Unknown=5, NotChecked=0, Total=1332 [2018-11-12 20:32:27,204 INFO L87 Difference]: Start difference. First operand 287 states and 298 transitions. Second operand 19 states. [2018-11-12 20:32:27,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:32:27,663 INFO L93 Difference]: Finished difference Result 340 states and 353 transitions. [2018-11-12 20:32:27,663 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-12 20:32:27,663 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 286 [2018-11-12 20:32:27,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:32:27,667 INFO L225 Difference]: With dead ends: 340 [2018-11-12 20:32:27,667 INFO L226 Difference]: Without dead ends: 335 [2018-11-12 20:32:27,668 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 548 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=388, Invalid=939, Unknown=5, NotChecked=0, Total=1332 [2018-11-12 20:32:27,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2018-11-12 20:32:27,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 312. [2018-11-12 20:32:27,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 312 states. [2018-11-12 20:32:27,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 324 transitions. [2018-11-12 20:32:27,696 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 324 transitions. Word has length 286 [2018-11-12 20:32:27,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:32:27,697 INFO L480 AbstractCegarLoop]: Abstraction has 312 states and 324 transitions. [2018-11-12 20:32:27,697 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-12 20:32:27,698 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 324 transitions. [2018-11-12 20:32:27,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 312 [2018-11-12 20:32:27,701 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:32:27,701 INFO L375 BasicCegarLoop]: trace histogram [132, 120, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:32:27,702 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:32:27,702 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:32:27,702 INFO L82 PathProgramCache]: Analyzing trace with hash 2024589542, now seen corresponding path program 12 times [2018-11-12 20:32:27,702 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:32:27,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:32:27,703 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:32:27,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:32:27,703 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:32:27,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:32:28,711 INFO L134 CoverageAnalysis]: Checked inductivity of 17514 backedges. 0 proven. 16194 refuted. 0 times theorem prover too weak. 1320 trivial. 0 not checked. [2018-11-12 20:32:28,711 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:32:28,711 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:32:28,711 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:32:28,711 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:32:28,712 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:32:28,712 INFO L192 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 [2018-11-12 20:32:28,721 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-12 20:32:28,721 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-12 20:32:28,820 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-12 20:32:28,820 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-12 20:32:28,826 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:32:29,000 INFO L134 CoverageAnalysis]: Checked inductivity of 17514 backedges. 0 proven. 16194 refuted. 0 times theorem prover too weak. 1320 trivial. 0 not checked. [2018-11-12 20:32:29,001 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:32:29,630 INFO L134 CoverageAnalysis]: Checked inductivity of 17514 backedges. 0 proven. 16194 refuted. 0 times theorem prover too weak. 1320 trivial. 0 not checked. [2018-11-12 20:32:29,651 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:32:29,651 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-11-12 20:32:29,652 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:32:29,652 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-12 20:32:29,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-12 20:32:29,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-11-12 20:32:29,653 INFO L87 Difference]: Start difference. First operand 312 states and 324 transitions. Second operand 15 states. [2018-11-12 20:32:29,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:32:29,924 INFO L93 Difference]: Finished difference Result 365 states and 379 transitions. [2018-11-12 20:32:29,925 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-12 20:32:29,925 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 311 [2018-11-12 20:32:29,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:32:29,927 INFO L225 Difference]: With dead ends: 365 [2018-11-12 20:32:29,927 INFO L226 Difference]: Without dead ends: 360 [2018-11-12 20:32:29,928 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 637 GetRequests, 609 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-11-12 20:32:29,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2018-11-12 20:32:29,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 337. [2018-11-12 20:32:29,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 337 states. [2018-11-12 20:32:29,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 350 transitions. [2018-11-12 20:32:29,957 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 350 transitions. Word has length 311 [2018-11-12 20:32:29,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:32:29,958 INFO L480 AbstractCegarLoop]: Abstraction has 337 states and 350 transitions. [2018-11-12 20:32:29,958 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-12 20:32:29,958 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 350 transitions. [2018-11-12 20:32:29,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2018-11-12 20:32:29,960 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:32:29,960 INFO L375 BasicCegarLoop]: trace histogram [143, 130, 14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:32:29,960 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:32:29,960 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:32:29,961 INFO L82 PathProgramCache]: Analyzing trace with hash -1437047234, now seen corresponding path program 13 times [2018-11-12 20:32:29,961 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:32:29,961 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:32:29,962 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-12 20:32:29,962 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:32:29,962 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:32:29,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:32:30,728 INFO L134 CoverageAnalysis]: Checked inductivity of 20566 backedges. 0 proven. 19136 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2018-11-12 20:32:30,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:32:30,728 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:32:30,728 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:32:30,728 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:32:30,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:32:30,729 INFO L192 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 [2018-11-12 20:32:30,736 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:32:30,737 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-12 20:32:30,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:32:30,835 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-12 20:32:31,014 INFO L134 CoverageAnalysis]: Checked inductivity of 20566 backedges. 0 proven. 19136 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2018-11-12 20:32:31,015 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-12 20:32:31,623 INFO L134 CoverageAnalysis]: Checked inductivity of 20566 backedges. 0 proven. 19136 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2018-11-12 20:32:31,644 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-12 20:32:31,644 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-11-12 20:32:31,644 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-12 20:32:31,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-12 20:32:31,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-12 20:32:31,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-11-12 20:32:31,645 INFO L87 Difference]: Start difference. First operand 337 states and 350 transitions. Second operand 16 states. [2018-11-12 20:32:32,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-12 20:32:32,930 INFO L93 Difference]: Finished difference Result 390 states and 405 transitions. [2018-11-12 20:32:32,930 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-12 20:32:32,931 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 336 [2018-11-12 20:32:32,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-12 20:32:32,932 INFO L225 Difference]: With dead ends: 390 [2018-11-12 20:32:32,932 INFO L226 Difference]: Without dead ends: 385 [2018-11-12 20:32:32,933 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 688 GetRequests, 658 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-11-12 20:32:32,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2018-11-12 20:32:32,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 362. [2018-11-12 20:32:32,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 362 states. [2018-11-12 20:32:32,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 376 transitions. [2018-11-12 20:32:32,968 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 376 transitions. Word has length 336 [2018-11-12 20:32:32,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-12 20:32:32,969 INFO L480 AbstractCegarLoop]: Abstraction has 362 states and 376 transitions. [2018-11-12 20:32:32,969 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-12 20:32:32,969 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 376 transitions. [2018-11-12 20:32:32,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 362 [2018-11-12 20:32:32,971 INFO L367 BasicCegarLoop]: Found error trace [2018-11-12 20:32:32,971 INFO L375 BasicCegarLoop]: trace histogram [154, 140, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-12 20:32:32,972 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-12 20:32:32,972 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-12 20:32:32,972 INFO L82 PathProgramCache]: Analyzing trace with hash 163314662, now seen corresponding path program 14 times [2018-11-12 20:32:32,972 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-12 20:32:32,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:32:32,973 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-12 20:32:32,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-12 20:32:32,973 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-12 20:32:33,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-12 20:32:35,024 INFO L134 CoverageAnalysis]: Checked inductivity of 23863 backedges. 0 proven. 22323 refuted. 0 times theorem prover too weak. 1540 trivial. 0 not checked. [2018-11-12 20:32:35,025 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:32:35,025 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-12 20:32:35,025 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-12 20:32:35,025 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-12 20:32:35,025 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-12 20:32:35,025 INFO L192 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 [2018-11-12 20:32:35,035 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-12 20:32:35,035 INFO L286 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