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-invgen/up_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 22:12:02,645 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 22:12:02,647 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 22:12:02,662 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 22:12:02,666 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 22:12:02,667 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 22:12:02,668 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 22:12:02,672 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 22:12:02,675 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 22:12:02,677 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 22:12:02,678 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 22:12:02,678 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 22:12:02,681 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 22:12:02,682 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 22:12:02,683 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 22:12:02,686 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 22:12:02,687 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 22:12:02,696 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 22:12:02,701 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 22:12:02,703 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 22:12:02,707 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 22:12:02,708 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 22:12:02,711 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 22:12:02,711 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 22:12:02,715 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 22:12:02,717 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 22:12:02,718 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 22:12:02,719 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 22:12:02,719 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 22:12:02,723 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 22:12:02,724 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 22:12:02,724 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-11-07 22:12:02,729 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT-LIM.epf [2018-11-07 22:12:02,756 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 22:12:02,756 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 22:12:02,760 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 22:12:02,760 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 22:12:02,760 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 22:12:02,760 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 22:12:02,761 INFO L133 SettingsManager]: * Maximum recursion depth of evaluation operations=6 [2018-11-07 22:12:02,761 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 22:12:02,761 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 22:12:02,761 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 22:12:02,761 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 22:12:02,761 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 22:12:02,762 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 22:12:02,763 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 22:12:02,763 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 22:12:02,763 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 22:12:02,763 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 22:12:02,765 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 22:12:02,765 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 22:12:02,765 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 22:12:02,766 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 22:12:02,766 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 22:12:02,766 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 22:12:02,766 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 22:12:02,766 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 22:12:02,767 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 22:12:02,767 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 22:12:02,767 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 22:12:02,767 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 22:12:02,767 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 22:12:02,768 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 22:12:02,768 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 22:12:02,768 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 22:12:02,768 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 22:12:02,769 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 22:12:02,832 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 22:12:02,847 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 22:12:02,851 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 22:12:02,853 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 22:12:02,854 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 22:12:02,854 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/up_true-unreach-call_true-termination.i [2018-11-07 22:12:02,920 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/643614e07/26f6bac104844c75a883c8a5c8617e72/FLAG547c89f0f [2018-11-07 22:12:03,385 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 22:12:03,386 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/up_true-unreach-call_true-termination.i [2018-11-07 22:12:03,392 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/643614e07/26f6bac104844c75a883c8a5c8617e72/FLAG547c89f0f [2018-11-07 22:12:03,406 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/643614e07/26f6bac104844c75a883c8a5c8617e72 [2018-11-07 22:12:03,418 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 22:12:03,419 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 22:12:03,420 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 22:12:03,421 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 22:12:03,424 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 22:12:03,425 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:12:03" (1/1) ... [2018-11-07 22:12:03,428 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@65f79378 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:12:03, skipping insertion in model container [2018-11-07 22:12:03,429 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:12:03" (1/1) ... [2018-11-07 22:12:03,441 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 22:12:03,465 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 22:12:03,656 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:12:03,659 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 22:12:03,674 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:12:03,688 INFO L193 MainTranslator]: Completed translation [2018-11-07 22:12:03,689 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:12:03 WrapperNode [2018-11-07 22:12:03,689 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 22:12:03,690 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 22:12:03,690 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 22:12:03,690 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 22:12:03,698 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:12:03" (1/1) ... [2018-11-07 22:12:03,703 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:12:03" (1/1) ... [2018-11-07 22:12:03,709 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 22:12:03,709 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 22:12:03,710 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 22:12:03,710 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 22:12:03,719 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:12:03" (1/1) ... [2018-11-07 22:12:03,720 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:12:03" (1/1) ... [2018-11-07 22:12:03,720 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:12:03" (1/1) ... [2018-11-07 22:12:03,721 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:12:03" (1/1) ... [2018-11-07 22:12:03,723 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:12:03" (1/1) ... [2018-11-07 22:12:03,728 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:12:03" (1/1) ... [2018-11-07 22:12:03,729 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:12:03" (1/1) ... [2018-11-07 22:12:03,730 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 22:12:03,731 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 22:12:03,731 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 22:12:03,731 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 22:12:03,732 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:12:03" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 22:12:03,856 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 22:12:03,856 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 22:12:03,857 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 22:12:03,857 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 22:12:03,857 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 22:12:03,857 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 22:12:03,857 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 22:12:03,857 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 22:12:04,132 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 22:12:04,133 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:12:04 BoogieIcfgContainer [2018-11-07 22:12:04,133 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 22:12:04,134 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 22:12:04,134 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 22:12:04,137 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 22:12:04,138 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 10:12:03" (1/3) ... [2018-11-07 22:12:04,139 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ec98e28 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:12:04, skipping insertion in model container [2018-11-07 22:12:04,139 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:12:03" (2/3) ... [2018-11-07 22:12:04,139 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ec98e28 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:12:04, skipping insertion in model container [2018-11-07 22:12:04,139 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:12:04" (3/3) ... [2018-11-07 22:12:04,142 INFO L112 eAbstractionObserver]: Analyzing ICFG up_true-unreach-call_true-termination.i [2018-11-07 22:12:04,153 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 22:12:04,161 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 22:12:04,185 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 22:12:04,227 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 22:12:04,227 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 22:12:04,227 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 22:12:04,227 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 22:12:04,227 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 22:12:04,227 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 22:12:04,227 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 22:12:04,228 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 22:12:04,245 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-11-07 22:12:04,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-07 22:12:04,252 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:04,253 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:04,255 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:04,263 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:04,263 INFO L82 PathProgramCache]: Analyzing trace with hash -1884544245, now seen corresponding path program 1 times [2018-11-07 22:12:04,269 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:04,320 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:04,321 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:04,321 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:04,321 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:04,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:04,385 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:12:04,387 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:12:04,387 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 22:12:04,387 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:12:04,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 22:12:04,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 22:12:04,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 22:12:04,406 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2018-11-07 22:12:04,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:04,427 INFO L93 Difference]: Finished difference Result 37 states and 44 transitions. [2018-11-07 22:12:04,428 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 22:12:04,429 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-11-07 22:12:04,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:04,437 INFO L225 Difference]: With dead ends: 37 [2018-11-07 22:12:04,437 INFO L226 Difference]: Without dead ends: 18 [2018-11-07 22:12:04,440 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 22:12:04,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-11-07 22:12:04,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-11-07 22:12:04,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-11-07 22:12:04,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-11-07 22:12:04,480 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-11-07 22:12:04,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:04,481 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-11-07 22:12:04,481 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 22:12:04,481 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-11-07 22:12:04,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-11-07 22:12:04,482 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:04,483 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:04,483 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:04,483 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:04,484 INFO L82 PathProgramCache]: Analyzing trace with hash 1969781111, now seen corresponding path program 1 times [2018-11-07 22:12:04,484 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:04,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:04,486 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:04,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:04,486 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:04,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:04,766 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:12:04,767 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:12:04,767 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-07 22:12:04,767 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:12:04,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-07 22:12:04,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-07 22:12:04,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-07 22:12:04,770 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 5 states. [2018-11-07 22:12:04,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:04,900 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2018-11-07 22:12:04,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 22:12:04,900 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2018-11-07 22:12:04,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:04,902 INFO L225 Difference]: With dead ends: 33 [2018-11-07 22:12:04,902 INFO L226 Difference]: Without dead ends: 20 [2018-11-07 22:12:04,903 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-11-07 22:12:04,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-11-07 22:12:04,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-11-07 22:12:04,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-11-07 22:12:04,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2018-11-07 22:12:04,910 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 14 [2018-11-07 22:12:04,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:04,910 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2018-11-07 22:12:04,912 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-07 22:12:04,912 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2018-11-07 22:12:04,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-11-07 22:12:04,913 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:04,913 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:04,913 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:04,915 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:04,915 INFO L82 PathProgramCache]: Analyzing trace with hash -1960344783, now seen corresponding path program 1 times [2018-11-07 22:12:04,915 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:04,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:04,916 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:04,918 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:04,918 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:04,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:05,051 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:12:05,051 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:12:05,052 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-11-07 22:12:05,054 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:12:05,054 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 22:12:05,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 22:12:05,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-11-07 22:12:05,055 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 6 states. [2018-11-07 22:12:05,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:05,216 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2018-11-07 22:12:05,217 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 22:12:05,217 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2018-11-07 22:12:05,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:05,220 INFO L225 Difference]: With dead ends: 34 [2018-11-07 22:12:05,220 INFO L226 Difference]: Without dead ends: 32 [2018-11-07 22:12:05,220 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-11-07 22:12:05,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-11-07 22:12:05,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 27. [2018-11-07 22:12:05,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-11-07 22:12:05,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-11-07 22:12:05,232 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 16 [2018-11-07 22:12:05,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:05,232 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-11-07 22:12:05,233 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 22:12:05,233 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-11-07 22:12:05,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-11-07 22:12:05,234 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:05,234 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:05,234 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:05,234 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:05,235 INFO L82 PathProgramCache]: Analyzing trace with hash -1864992939, now seen corresponding path program 1 times [2018-11-07 22:12:05,235 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:05,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:05,236 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:05,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:05,236 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:05,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:05,520 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:12:05,520 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:05,520 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:05,521 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-11-07 22:12:05,523 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [18], [22], [28], [30], [35], [38], [40], [43], [45], [46], [47], [48], [50], [51] [2018-11-07 22:12:05,557 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 22:12:05,557 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 22:12:05,881 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 22:12:05,882 INFO L272 AbstractInterpreter]: Visited 19 different actions 115 times. Merged at 8 different actions 48 times. Widened at 3 different actions 6 times. Found 7 fixpoints after 3 different actions. Largest state had 9 variables. [2018-11-07 22:12:05,906 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:05,907 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 22:12:05,907 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:05,907 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:05,918 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:05,918 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:12:05,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:05,951 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:06,065 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:12:06,065 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:06,146 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:12:06,177 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:06,177 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2018-11-07 22:12:06,177 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:06,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 22:12:06,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 22:12:06,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2018-11-07 22:12:06,179 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2018-11-07 22:12:06,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:06,394 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2018-11-07 22:12:06,394 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-07 22:12:06,395 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2018-11-07 22:12:06,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:06,398 INFO L225 Difference]: With dead ends: 46 [2018-11-07 22:12:06,398 INFO L226 Difference]: Without dead ends: 29 [2018-11-07 22:12:06,399 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 43 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2018-11-07 22:12:06,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-11-07 22:12:06,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-11-07 22:12:06,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-11-07 22:12:06,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2018-11-07 22:12:06,405 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 24 [2018-11-07 22:12:06,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:06,406 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2018-11-07 22:12:06,406 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 22:12:06,406 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2018-11-07 22:12:06,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-11-07 22:12:06,407 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:06,407 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:06,407 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:06,408 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:06,408 INFO L82 PathProgramCache]: Analyzing trace with hash -62381937, now seen corresponding path program 2 times [2018-11-07 22:12:06,408 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:06,409 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:06,409 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:06,409 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:06,410 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:06,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:06,536 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:12:06,536 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:06,536 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:06,537 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:06,537 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:06,537 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:06,537 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:06,553 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:12:06,553 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:12:06,578 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 22:12:06,578 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:06,582 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:06,660 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:12:06,661 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:07,014 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:12:07,034 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:07,035 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 10 [2018-11-07 22:12:07,035 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:07,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 22:12:07,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 22:12:07,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2018-11-07 22:12:07,037 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 10 states. [2018-11-07 22:12:07,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:07,187 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2018-11-07 22:12:07,187 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-07 22:12:07,188 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2018-11-07 22:12:07,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:07,190 INFO L225 Difference]: With dead ends: 39 [2018-11-07 22:12:07,190 INFO L226 Difference]: Without dead ends: 37 [2018-11-07 22:12:07,191 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 49 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2018-11-07 22:12:07,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-11-07 22:12:07,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-11-07 22:12:07,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-11-07 22:12:07,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2018-11-07 22:12:07,198 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 26 [2018-11-07 22:12:07,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:07,199 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2018-11-07 22:12:07,199 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 22:12:07,199 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2018-11-07 22:12:07,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-11-07 22:12:07,200 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:07,200 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:07,201 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:07,201 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:07,201 INFO L82 PathProgramCache]: Analyzing trace with hash 1261098675, now seen corresponding path program 3 times [2018-11-07 22:12:07,201 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:07,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:07,202 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:07,203 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:07,203 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:07,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:07,389 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 22:12:07,389 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:07,389 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:07,391 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:07,391 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:07,391 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:07,392 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:07,406 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:12:07,406 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:12:07,422 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:12:07,422 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:07,425 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:07,552 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 22:12:07,553 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:07,694 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 22:12:07,713 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:07,714 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 12 [2018-11-07 22:12:07,714 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:07,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-07 22:12:07,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-07 22:12:07,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2018-11-07 22:12:07,715 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 12 states. [2018-11-07 22:12:07,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:07,880 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2018-11-07 22:12:07,880 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-07 22:12:07,881 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2018-11-07 22:12:07,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:07,882 INFO L225 Difference]: With dead ends: 60 [2018-11-07 22:12:07,882 INFO L226 Difference]: Without dead ends: 39 [2018-11-07 22:12:07,883 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 60 SyntacticMatches, 6 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=167, Unknown=0, NotChecked=0, Total=240 [2018-11-07 22:12:07,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-11-07 22:12:07,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-11-07 22:12:07,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-11-07 22:12:07,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-11-07 22:12:07,889 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 34 [2018-11-07 22:12:07,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:07,890 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-11-07 22:12:07,890 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-07 22:12:07,890 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-11-07 22:12:07,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-11-07 22:12:07,891 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:07,892 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:07,892 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:07,892 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:07,892 INFO L82 PathProgramCache]: Analyzing trace with hash -1825718419, now seen corresponding path program 4 times [2018-11-07 22:12:07,892 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:07,893 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:07,894 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:07,894 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:07,894 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:07,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:08,040 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 15 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-07 22:12:08,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:08,041 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:08,041 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:08,041 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:08,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:08,041 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:08,050 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:08,051 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:12:08,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:08,078 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:08,138 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 22:12:08,138 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:08,209 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 22:12:08,228 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:08,229 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 11 [2018-11-07 22:12:08,229 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:08,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-07 22:12:08,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-07 22:12:08,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2018-11-07 22:12:08,231 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 11 states. [2018-11-07 22:12:08,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:08,405 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-11-07 22:12:08,406 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 22:12:08,406 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 36 [2018-11-07 22:12:08,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:08,408 INFO L225 Difference]: With dead ends: 49 [2018-11-07 22:12:08,408 INFO L226 Difference]: Without dead ends: 47 [2018-11-07 22:12:08,409 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 7 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-11-07 22:12:08,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-11-07 22:12:08,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-11-07 22:12:08,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-11-07 22:12:08,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2018-11-07 22:12:08,417 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 36 [2018-11-07 22:12:08,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:08,417 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2018-11-07 22:12:08,417 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-07 22:12:08,417 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2018-11-07 22:12:08,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-11-07 22:12:08,419 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:08,419 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:08,419 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:08,419 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:08,420 INFO L82 PathProgramCache]: Analyzing trace with hash -51726447, now seen corresponding path program 5 times [2018-11-07 22:12:08,420 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:08,421 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:08,421 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:08,421 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:08,421 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:08,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:08,574 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 22:12:08,574 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:08,575 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:08,575 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:08,575 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:08,575 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:08,576 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:08,585 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:12:08,585 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:12:08,605 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-11-07 22:12:08,605 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:08,609 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:08,880 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 22:12:08,880 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:08,990 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 22:12:09,010 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:09,011 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 15 [2018-11-07 22:12:09,011 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:09,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-07 22:12:09,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-07 22:12:09,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2018-11-07 22:12:09,012 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 15 states. [2018-11-07 22:12:09,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:09,202 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2018-11-07 22:12:09,207 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 22:12:09,207 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2018-11-07 22:12:09,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:09,209 INFO L225 Difference]: With dead ends: 74 [2018-11-07 22:12:09,209 INFO L226 Difference]: Without dead ends: 49 [2018-11-07 22:12:09,210 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 77 SyntacticMatches, 8 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=271, Unknown=0, NotChecked=0, Total=380 [2018-11-07 22:12:09,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-11-07 22:12:09,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-11-07 22:12:09,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-11-07 22:12:09,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2018-11-07 22:12:09,218 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 44 [2018-11-07 22:12:09,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:09,218 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2018-11-07 22:12:09,218 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-07 22:12:09,218 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2018-11-07 22:12:09,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-11-07 22:12:09,220 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:09,220 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:09,220 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:09,221 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:09,221 INFO L82 PathProgramCache]: Analyzing trace with hash 446005195, now seen corresponding path program 6 times [2018-11-07 22:12:09,221 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:09,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:09,222 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:09,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:09,222 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:09,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:09,380 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 25 proven. 28 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-07 22:12:09,380 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:09,380 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:09,381 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:09,381 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:09,381 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:09,381 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:09,391 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:12:09,391 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:12:09,438 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:12:09,438 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:09,441 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:09,504 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 22:12:09,504 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:09,584 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 22:12:09,605 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:09,605 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 12 [2018-11-07 22:12:09,605 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:09,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-07 22:12:09,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-07 22:12:09,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2018-11-07 22:12:09,606 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 12 states. [2018-11-07 22:12:09,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:09,884 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2018-11-07 22:12:09,885 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 22:12:09,885 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 46 [2018-11-07 22:12:09,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:09,887 INFO L225 Difference]: With dead ends: 59 [2018-11-07 22:12:09,887 INFO L226 Difference]: Without dead ends: 57 [2018-11-07 22:12:09,888 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 87 SyntacticMatches, 9 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2018-11-07 22:12:09,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-07 22:12:09,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-11-07 22:12:09,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-11-07 22:12:09,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-11-07 22:12:09,895 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 46 [2018-11-07 22:12:09,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:09,896 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-11-07 22:12:09,896 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-07 22:12:09,896 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-11-07 22:12:09,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-11-07 22:12:09,898 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:09,898 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:09,898 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:09,898 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:09,898 INFO L82 PathProgramCache]: Analyzing trace with hash -239912465, now seen corresponding path program 7 times [2018-11-07 22:12:09,899 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:09,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:09,900 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:09,900 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:09,900 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:09,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:10,131 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 22:12:10,131 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:10,131 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:10,131 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:10,131 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:10,132 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:10,132 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:10,141 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:10,141 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:12:10,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:10,162 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:10,380 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 22:12:10,381 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:10,499 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 22:12:10,519 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:10,519 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 18 [2018-11-07 22:12:10,519 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:10,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-07 22:12:10,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-07 22:12:10,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2018-11-07 22:12:10,521 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 18 states. [2018-11-07 22:12:10,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:10,912 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2018-11-07 22:12:10,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 22:12:10,913 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 54 [2018-11-07 22:12:10,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:10,914 INFO L225 Difference]: With dead ends: 88 [2018-11-07 22:12:10,915 INFO L226 Difference]: Without dead ends: 59 [2018-11-07 22:12:10,915 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 94 SyntacticMatches, 10 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=152, Invalid=400, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:12:10,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-11-07 22:12:10,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-11-07 22:12:10,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-11-07 22:12:10,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2018-11-07 22:12:10,924 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 54 [2018-11-07 22:12:10,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:10,924 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2018-11-07 22:12:10,924 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-07 22:12:10,924 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2018-11-07 22:12:10,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-11-07 22:12:10,925 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:10,926 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:10,926 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:10,926 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:10,926 INFO L82 PathProgramCache]: Analyzing trace with hash -363560535, now seen corresponding path program 8 times [2018-11-07 22:12:10,926 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:10,927 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:10,927 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:10,927 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:10,927 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:10,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:11,066 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 37 proven. 46 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 22:12:11,067 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:11,067 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:11,067 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:11,067 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:11,067 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:11,067 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:11,076 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:12:11,077 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:12:11,138 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 22:12:11,138 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:11,141 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:11,263 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 22:12:11,264 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:11,412 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 22:12:11,433 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:11,433 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 13 [2018-11-07 22:12:11,433 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:11,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 22:12:11,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 22:12:11,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-11-07 22:12:11,435 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand 13 states. [2018-11-07 22:12:11,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:11,625 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2018-11-07 22:12:11,625 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-07 22:12:11,625 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 56 [2018-11-07 22:12:11,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:11,627 INFO L225 Difference]: With dead ends: 69 [2018-11-07 22:12:11,627 INFO L226 Difference]: Without dead ends: 67 [2018-11-07 22:12:11,628 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 106 SyntacticMatches, 11 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2018-11-07 22:12:11,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-11-07 22:12:11,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-11-07 22:12:11,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-11-07 22:12:11,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2018-11-07 22:12:11,636 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 56 [2018-11-07 22:12:11,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:11,636 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2018-11-07 22:12:11,636 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 22:12:11,637 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2018-11-07 22:12:11,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-11-07 22:12:11,638 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:11,638 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:11,638 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:11,638 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:11,639 INFO L82 PathProgramCache]: Analyzing trace with hash 1782152653, now seen corresponding path program 9 times [2018-11-07 22:12:11,639 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:11,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:11,640 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:11,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:11,640 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:11,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:12,421 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 22:12:12,421 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:12,422 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:12,422 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:12,422 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:12,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:12,422 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:12,432 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:12:12,432 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:12:12,456 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:12:12,456 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:12,460 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:12,715 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 22:12:12,716 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:12,870 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 22:12:12,890 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:12,891 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 21 [2018-11-07 22:12:12,891 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:12,891 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-07 22:12:12,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-07 22:12:12,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2018-11-07 22:12:12,893 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 21 states. [2018-11-07 22:12:13,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:13,391 INFO L93 Difference]: Finished difference Result 102 states and 109 transitions. [2018-11-07 22:12:13,391 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-07 22:12:13,391 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 64 [2018-11-07 22:12:13,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:13,392 INFO L225 Difference]: With dead ends: 102 [2018-11-07 22:12:13,392 INFO L226 Difference]: Without dead ends: 69 [2018-11-07 22:12:13,393 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 111 SyntacticMatches, 12 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=202, Invalid=554, Unknown=0, NotChecked=0, Total=756 [2018-11-07 22:12:13,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-11-07 22:12:13,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-11-07 22:12:13,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-11-07 22:12:13,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-11-07 22:12:13,401 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 64 [2018-11-07 22:12:13,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:13,402 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-11-07 22:12:13,402 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-07 22:12:13,402 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-11-07 22:12:13,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-11-07 22:12:13,403 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:13,403 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:13,404 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:13,404 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:13,404 INFO L82 PathProgramCache]: Analyzing trace with hash 1767367943, now seen corresponding path program 10 times [2018-11-07 22:12:13,404 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:13,405 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:13,405 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:13,405 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:13,406 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:13,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:13,805 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 51 proven. 68 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-07 22:12:13,806 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:13,806 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:13,806 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:13,806 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:13,806 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:13,806 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:13,826 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:13,826 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:12:13,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:13,863 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:14,014 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 22:12:14,015 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:14,227 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 22:12:14,247 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:14,248 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 14 [2018-11-07 22:12:14,248 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:14,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 22:12:14,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 22:12:14,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2018-11-07 22:12:14,249 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 14 states. [2018-11-07 22:12:14,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:14,519 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-11-07 22:12:14,519 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 22:12:14,519 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 66 [2018-11-07 22:12:14,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:14,520 INFO L225 Difference]: With dead ends: 79 [2018-11-07 22:12:14,521 INFO L226 Difference]: Without dead ends: 77 [2018-11-07 22:12:14,521 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 125 SyntacticMatches, 13 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2018-11-07 22:12:14,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-11-07 22:12:14,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2018-11-07 22:12:14,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-11-07 22:12:14,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2018-11-07 22:12:14,528 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 66 [2018-11-07 22:12:14,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:14,529 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2018-11-07 22:12:14,529 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 22:12:14,529 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2018-11-07 22:12:14,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-11-07 22:12:14,530 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:14,530 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:14,530 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:14,531 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:14,531 INFO L82 PathProgramCache]: Analyzing trace with hash 508207915, now seen corresponding path program 11 times [2018-11-07 22:12:14,531 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:14,532 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:14,532 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:14,532 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:14,532 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:14,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:14,779 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 22:12:14,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:14,780 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:14,780 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:14,780 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:14,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:14,780 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:14,789 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:12:14,789 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:12:14,817 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-11-07 22:12:14,817 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:14,821 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:15,061 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 22:12:15,061 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:15,426 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 22:12:15,449 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:15,449 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 24 [2018-11-07 22:12:15,449 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:15,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-07 22:12:15,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-07 22:12:15,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=409, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:12:15,450 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand 24 states. [2018-11-07 22:12:15,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:15,768 INFO L93 Difference]: Finished difference Result 116 states and 124 transitions. [2018-11-07 22:12:15,768 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 22:12:15,769 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 74 [2018-11-07 22:12:15,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:15,770 INFO L225 Difference]: With dead ends: 116 [2018-11-07 22:12:15,770 INFO L226 Difference]: Without dead ends: 79 [2018-11-07 22:12:15,771 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 128 SyntacticMatches, 14 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=259, Invalid=733, Unknown=0, NotChecked=0, Total=992 [2018-11-07 22:12:15,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-11-07 22:12:15,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-11-07 22:12:15,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-11-07 22:12:15,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-11-07 22:12:15,779 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 74 [2018-11-07 22:12:15,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:15,779 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-11-07 22:12:15,779 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-07 22:12:15,779 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-11-07 22:12:15,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-11-07 22:12:15,780 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:15,781 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:15,781 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:15,781 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:15,781 INFO L82 PathProgramCache]: Analyzing trace with hash 262457829, now seen corresponding path program 12 times [2018-11-07 22:12:15,781 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:15,782 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:15,782 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:15,782 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:15,782 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:15,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:15,928 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 67 proven. 94 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 22:12:15,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:15,929 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:15,929 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:15,929 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:15,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:15,929 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:15,939 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:12:15,940 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:12:15,962 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:12:15,962 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:15,965 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:16,026 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 22:12:16,026 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:16,119 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 22:12:16,139 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:16,139 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 15 [2018-11-07 22:12:16,139 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:16,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-07 22:12:16,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-07 22:12:16,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2018-11-07 22:12:16,140 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 15 states. [2018-11-07 22:12:16,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:16,334 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2018-11-07 22:12:16,335 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 22:12:16,335 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 76 [2018-11-07 22:12:16,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:16,336 INFO L225 Difference]: With dead ends: 89 [2018-11-07 22:12:16,336 INFO L226 Difference]: Without dead ends: 87 [2018-11-07 22:12:16,337 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 144 SyntacticMatches, 15 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2018-11-07 22:12:16,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-11-07 22:12:16,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-11-07 22:12:16,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-11-07 22:12:16,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-11-07 22:12:16,344 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 76 [2018-11-07 22:12:16,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:16,345 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-11-07 22:12:16,345 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-07 22:12:16,345 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-11-07 22:12:16,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-11-07 22:12:16,346 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:16,346 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:16,346 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:16,347 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:16,347 INFO L82 PathProgramCache]: Analyzing trace with hash 1053542921, now seen corresponding path program 13 times [2018-11-07 22:12:16,347 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:16,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:16,348 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:16,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:16,348 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:16,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:16,548 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 22:12:16,548 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:16,548 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:16,548 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:16,548 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:16,549 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:16,549 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:16,557 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:16,558 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:12:16,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:16,595 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:16,795 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 22:12:16,795 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:16,967 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 22:12:16,988 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:16,989 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 27 [2018-11-07 22:12:16,989 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:16,989 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-11-07 22:12:16,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-11-07 22:12:16,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=523, Unknown=0, NotChecked=0, Total=702 [2018-11-07 22:12:16,990 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 27 states. [2018-11-07 22:12:17,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:17,332 INFO L93 Difference]: Finished difference Result 130 states and 139 transitions. [2018-11-07 22:12:17,332 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 22:12:17,332 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 84 [2018-11-07 22:12:17,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:17,333 INFO L225 Difference]: With dead ends: 130 [2018-11-07 22:12:17,333 INFO L226 Difference]: Without dead ends: 89 [2018-11-07 22:12:17,334 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 145 SyntacticMatches, 16 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 415 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=323, Invalid=937, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 22:12:17,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-11-07 22:12:17,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2018-11-07 22:12:17,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-11-07 22:12:17,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 90 transitions. [2018-11-07 22:12:17,343 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 90 transitions. Word has length 84 [2018-11-07 22:12:17,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:17,344 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 90 transitions. [2018-11-07 22:12:17,344 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-11-07 22:12:17,344 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 90 transitions. [2018-11-07 22:12:17,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-11-07 22:12:17,345 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:17,345 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:17,345 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:17,346 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:17,346 INFO L82 PathProgramCache]: Analyzing trace with hash -396865469, now seen corresponding path program 14 times [2018-11-07 22:12:17,346 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:17,347 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:17,347 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:17,347 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:17,347 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:17,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:17,571 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 85 proven. 124 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-07 22:12:17,571 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:17,571 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:17,571 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:17,572 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:17,572 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:17,572 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:17,580 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:12:17,580 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:12:17,609 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 22:12:17,610 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:17,612 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:17,678 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 22:12:17,678 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:17,809 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 22:12:17,828 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:17,829 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 16 [2018-11-07 22:12:17,829 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:17,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 22:12:17,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 22:12:17,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2018-11-07 22:12:17,830 INFO L87 Difference]: Start difference. First operand 89 states and 90 transitions. Second operand 16 states. [2018-11-07 22:12:18,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:18,000 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2018-11-07 22:12:18,001 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-07 22:12:18,001 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 86 [2018-11-07 22:12:18,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:18,002 INFO L225 Difference]: With dead ends: 99 [2018-11-07 22:12:18,003 INFO L226 Difference]: Without dead ends: 97 [2018-11-07 22:12:18,003 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 163 SyntacticMatches, 17 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2018-11-07 22:12:18,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-11-07 22:12:18,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-11-07 22:12:18,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-11-07 22:12:18,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-11-07 22:12:18,010 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 86 [2018-11-07 22:12:18,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:18,013 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-11-07 22:12:18,013 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 22:12:18,013 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-11-07 22:12:18,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-11-07 22:12:18,015 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:18,015 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:18,015 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:18,016 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:18,016 INFO L82 PathProgramCache]: Analyzing trace with hash -138800537, now seen corresponding path program 15 times [2018-11-07 22:12:18,016 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:18,017 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:18,017 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:18,017 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:18,018 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:18,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:18,324 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 22:12:18,324 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:18,325 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:18,325 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:18,325 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:18,325 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:18,325 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:18,335 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:12:18,335 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:12:18,367 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:12:18,367 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:18,370 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:18,625 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 22:12:18,626 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:18,887 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 22:12:18,907 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:18,907 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 30 [2018-11-07 22:12:18,907 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:18,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-11-07 22:12:18,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-11-07 22:12:18,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=651, Unknown=0, NotChecked=0, Total=870 [2018-11-07 22:12:18,909 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 30 states. [2018-11-07 22:12:19,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:19,196 INFO L93 Difference]: Finished difference Result 144 states and 154 transitions. [2018-11-07 22:12:19,196 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-07 22:12:19,197 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 94 [2018-11-07 22:12:19,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:19,198 INFO L225 Difference]: With dead ends: 144 [2018-11-07 22:12:19,198 INFO L226 Difference]: Without dead ends: 99 [2018-11-07 22:12:19,199 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 162 SyntacticMatches, 18 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=394, Invalid=1166, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 22:12:19,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-11-07 22:12:19,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2018-11-07 22:12:19,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-11-07 22:12:19,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2018-11-07 22:12:19,206 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 94 [2018-11-07 22:12:19,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:19,207 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2018-11-07 22:12:19,207 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-11-07 22:12:19,207 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2018-11-07 22:12:19,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-11-07 22:12:19,208 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:19,208 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:19,208 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:19,208 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:19,208 INFO L82 PathProgramCache]: Analyzing trace with hash -1817733087, now seen corresponding path program 16 times [2018-11-07 22:12:19,209 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:19,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:19,209 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:19,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:19,210 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:19,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:19,429 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 105 proven. 158 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-07 22:12:19,429 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:19,430 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:19,430 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:19,430 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:19,430 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:19,430 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:19,440 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:19,440 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:12:19,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:19,470 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:19,546 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 22:12:19,546 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:19,654 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 22:12:19,675 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:19,676 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 17 [2018-11-07 22:12:19,676 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:19,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-07 22:12:19,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-07 22:12:19,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=194, Unknown=0, NotChecked=0, Total=272 [2018-11-07 22:12:19,677 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand 17 states. [2018-11-07 22:12:20,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:20,107 INFO L93 Difference]: Finished difference Result 109 states and 110 transitions. [2018-11-07 22:12:20,108 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 22:12:20,108 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 96 [2018-11-07 22:12:20,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:20,110 INFO L225 Difference]: With dead ends: 109 [2018-11-07 22:12:20,110 INFO L226 Difference]: Without dead ends: 107 [2018-11-07 22:12:20,113 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 182 SyntacticMatches, 19 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2018-11-07 22:12:20,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2018-11-07 22:12:20,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2018-11-07 22:12:20,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-11-07 22:12:20,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 108 transitions. [2018-11-07 22:12:20,120 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 108 transitions. Word has length 96 [2018-11-07 22:12:20,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:20,120 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 108 transitions. [2018-11-07 22:12:20,120 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-07 22:12:20,120 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 108 transitions. [2018-11-07 22:12:20,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-11-07 22:12:20,121 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:20,121 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:20,121 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:20,122 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:20,122 INFO L82 PathProgramCache]: Analyzing trace with hash 1915395141, now seen corresponding path program 17 times [2018-11-07 22:12:20,122 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:20,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:20,123 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:20,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:20,123 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:20,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:20,615 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 22:12:20,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:20,615 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:20,615 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:20,615 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:20,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:20,616 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:20,624 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:12:20,624 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:12:20,679 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-11-07 22:12:20,679 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:20,683 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:20,902 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 22:12:20,902 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:21,152 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 22:12:21,172 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:21,172 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 33 [2018-11-07 22:12:21,172 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:21,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-11-07 22:12:21,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-11-07 22:12:21,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=793, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 22:12:21,173 INFO L87 Difference]: Start difference. First operand 107 states and 108 transitions. Second operand 33 states. [2018-11-07 22:12:21,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:21,742 INFO L93 Difference]: Finished difference Result 158 states and 169 transitions. [2018-11-07 22:12:21,743 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-07 22:12:21,743 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 104 [2018-11-07 22:12:21,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:21,744 INFO L225 Difference]: With dead ends: 158 [2018-11-07 22:12:21,744 INFO L226 Difference]: Without dead ends: 109 [2018-11-07 22:12:21,745 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 179 SyntacticMatches, 20 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 659 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=472, Invalid=1420, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 22:12:21,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-11-07 22:12:21,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2018-11-07 22:12:21,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2018-11-07 22:12:21,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 110 transitions. [2018-11-07 22:12:21,753 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 110 transitions. Word has length 104 [2018-11-07 22:12:21,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:21,753 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 110 transitions. [2018-11-07 22:12:21,753 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-11-07 22:12:21,753 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 110 transitions. [2018-11-07 22:12:21,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2018-11-07 22:12:21,754 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:21,754 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:21,755 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:21,755 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:21,755 INFO L82 PathProgramCache]: Analyzing trace with hash -924860033, now seen corresponding path program 18 times [2018-11-07 22:12:21,755 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:21,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:21,756 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:21,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:21,756 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:21,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:21,928 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 127 proven. 196 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-07 22:12:21,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:21,929 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:21,929 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:21,929 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:21,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:21,929 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:21,937 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:12:21,938 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:12:21,970 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:12:21,970 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:21,972 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:22,065 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 22:12:22,066 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:22,294 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 22:12:22,314 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:22,315 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 18 [2018-11-07 22:12:22,315 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:22,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-07 22:12:22,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-07 22:12:22,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2018-11-07 22:12:22,316 INFO L87 Difference]: Start difference. First operand 109 states and 110 transitions. Second operand 18 states. [2018-11-07 22:12:22,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:22,506 INFO L93 Difference]: Finished difference Result 119 states and 120 transitions. [2018-11-07 22:12:22,507 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 22:12:22,507 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 106 [2018-11-07 22:12:22,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:22,508 INFO L225 Difference]: With dead ends: 119 [2018-11-07 22:12:22,509 INFO L226 Difference]: Without dead ends: 117 [2018-11-07 22:12:22,509 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 201 SyntacticMatches, 21 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2018-11-07 22:12:22,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-11-07 22:12:22,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2018-11-07 22:12:22,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-11-07 22:12:22,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 118 transitions. [2018-11-07 22:12:22,516 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 118 transitions. Word has length 106 [2018-11-07 22:12:22,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:22,516 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 118 transitions. [2018-11-07 22:12:22,516 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-07 22:12:22,516 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 118 transitions. [2018-11-07 22:12:22,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-11-07 22:12:22,517 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:22,517 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:22,518 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:22,518 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:22,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1447724963, now seen corresponding path program 19 times [2018-11-07 22:12:22,518 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:22,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:22,519 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:22,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:22,519 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:22,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:22,843 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 22:12:22,843 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:22,843 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:22,843 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:22,844 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:22,844 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:22,844 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:22,852 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:22,852 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:12:22,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:22,889 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:23,393 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 22:12:23,393 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:23,681 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 22:12:23,701 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:23,701 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 36 [2018-11-07 22:12:23,701 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:23,702 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-11-07 22:12:23,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-11-07 22:12:23,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=949, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 22:12:23,703 INFO L87 Difference]: Start difference. First operand 117 states and 118 transitions. Second operand 36 states. [2018-11-07 22:12:24,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:24,308 INFO L93 Difference]: Finished difference Result 172 states and 184 transitions. [2018-11-07 22:12:24,310 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-07 22:12:24,310 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 114 [2018-11-07 22:12:24,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:24,311 INFO L225 Difference]: With dead ends: 172 [2018-11-07 22:12:24,312 INFO L226 Difference]: Without dead ends: 119 [2018-11-07 22:12:24,313 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 196 SyntacticMatches, 22 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 802 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=557, Invalid=1699, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 22:12:24,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2018-11-07 22:12:24,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2018-11-07 22:12:24,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-11-07 22:12:24,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 120 transitions. [2018-11-07 22:12:24,322 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 120 transitions. Word has length 114 [2018-11-07 22:12:24,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:24,322 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 120 transitions. [2018-11-07 22:12:24,322 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-11-07 22:12:24,322 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 120 transitions. [2018-11-07 22:12:24,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-11-07 22:12:24,323 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:24,324 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:24,324 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:24,324 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:24,324 INFO L82 PathProgramCache]: Analyzing trace with hash 1483074653, now seen corresponding path program 20 times [2018-11-07 22:12:24,324 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:24,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:24,325 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:24,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:24,325 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:24,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:24,573 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 151 proven. 238 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-11-07 22:12:24,574 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:24,574 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:24,574 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:24,574 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:24,574 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:24,574 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:24,583 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:12:24,583 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:12:24,625 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-07 22:12:24,625 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:24,628 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:24,682 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 22:12:24,682 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:25,001 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 22:12:25,022 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:25,022 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 19 [2018-11-07 22:12:25,022 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:25,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 22:12:25,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 22:12:25,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=239, Unknown=0, NotChecked=0, Total=342 [2018-11-07 22:12:25,023 INFO L87 Difference]: Start difference. First operand 119 states and 120 transitions. Second operand 19 states. [2018-11-07 22:12:25,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:25,219 INFO L93 Difference]: Finished difference Result 129 states and 130 transitions. [2018-11-07 22:12:25,219 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-07 22:12:25,219 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 116 [2018-11-07 22:12:25,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:25,221 INFO L225 Difference]: With dead ends: 129 [2018-11-07 22:12:25,221 INFO L226 Difference]: Without dead ends: 127 [2018-11-07 22:12:25,222 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 220 SyntacticMatches, 23 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=116, Invalid=304, Unknown=0, NotChecked=0, Total=420 [2018-11-07 22:12:25,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-11-07 22:12:25,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2018-11-07 22:12:25,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-11-07 22:12:25,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2018-11-07 22:12:25,228 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 116 [2018-11-07 22:12:25,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:25,229 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2018-11-07 22:12:25,229 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 22:12:25,229 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2018-11-07 22:12:25,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2018-11-07 22:12:25,230 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:25,230 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:25,230 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:25,231 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:25,231 INFO L82 PathProgramCache]: Analyzing trace with hash -849415039, now seen corresponding path program 21 times [2018-11-07 22:12:25,231 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:25,232 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:25,232 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:25,232 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:25,232 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:25,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:25,829 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 22:12:25,830 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:25,830 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:25,830 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:25,830 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:25,830 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:25,830 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:25,840 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:12:25,840 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:12:25,873 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:12:25,874 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:25,876 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:27,762 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 22:12:27,762 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:27,995 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 22:12:28,015 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:28,016 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 39 [2018-11-07 22:12:28,016 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:28,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-11-07 22:12:28,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-11-07 22:12:28,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=1119, Unknown=0, NotChecked=0, Total=1482 [2018-11-07 22:12:28,017 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand 39 states. [2018-11-07 22:12:28,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:28,579 INFO L93 Difference]: Finished difference Result 186 states and 199 transitions. [2018-11-07 22:12:28,580 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-11-07 22:12:28,580 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 124 [2018-11-07 22:12:28,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:28,581 INFO L225 Difference]: With dead ends: 186 [2018-11-07 22:12:28,581 INFO L226 Difference]: Without dead ends: 129 [2018-11-07 22:12:28,583 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 213 SyntacticMatches, 24 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 959 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=649, Invalid=2003, Unknown=0, NotChecked=0, Total=2652 [2018-11-07 22:12:28,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-11-07 22:12:28,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2018-11-07 22:12:28,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-11-07 22:12:28,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 130 transitions. [2018-11-07 22:12:28,590 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 130 transitions. Word has length 124 [2018-11-07 22:12:28,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:28,590 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 130 transitions. [2018-11-07 22:12:28,591 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-11-07 22:12:28,591 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 130 transitions. [2018-11-07 22:12:28,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2018-11-07 22:12:28,592 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:28,592 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:28,592 INFO L423 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:28,592 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:28,592 INFO L82 PathProgramCache]: Analyzing trace with hash -1380501317, now seen corresponding path program 22 times [2018-11-07 22:12:28,592 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:28,593 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:28,593 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:28,593 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:28,593 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:28,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:29,111 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 177 proven. 284 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-11-07 22:12:29,111 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:29,111 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:29,111 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:29,111 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:29,111 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:29,111 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:29,120 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:29,120 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:12:29,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:29,156 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:29,204 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 178 proven. 253 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 22:12:29,205 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:29,438 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 178 proven. 253 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 22:12:29,458 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:29,459 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 20 [2018-11-07 22:12:29,459 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:29,459 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-07 22:12:29,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-07 22:12:29,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=263, Unknown=0, NotChecked=0, Total=380 [2018-11-07 22:12:29,460 INFO L87 Difference]: Start difference. First operand 129 states and 130 transitions. Second operand 20 states. [2018-11-07 22:12:29,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:29,720 INFO L93 Difference]: Finished difference Result 139 states and 140 transitions. [2018-11-07 22:12:29,720 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 22:12:29,720 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 126 [2018-11-07 22:12:29,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:29,722 INFO L225 Difference]: With dead ends: 139 [2018-11-07 22:12:29,722 INFO L226 Difference]: Without dead ends: 137 [2018-11-07 22:12:29,723 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 239 SyntacticMatches, 25 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=130, Invalid=332, Unknown=0, NotChecked=0, Total=462 [2018-11-07 22:12:29,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2018-11-07 22:12:29,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2018-11-07 22:12:29,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2018-11-07 22:12:29,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 138 transitions. [2018-11-07 22:12:29,730 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 138 transitions. Word has length 126 [2018-11-07 22:12:29,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:29,731 INFO L480 AbstractCegarLoop]: Abstraction has 137 states and 138 transitions. [2018-11-07 22:12:29,731 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-07 22:12:29,731 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 138 transitions. [2018-11-07 22:12:29,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-11-07 22:12:29,732 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:29,732 INFO L375 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:29,732 INFO L423 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:29,732 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:29,733 INFO L82 PathProgramCache]: Analyzing trace with hash 63242975, now seen corresponding path program 23 times [2018-11-07 22:12:29,733 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:29,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:29,733 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:29,734 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:29,734 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:29,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:30,164 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-11-07 22:12:30,164 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:30,164 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:30,165 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:30,165 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:30,165 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:30,165 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:30,173 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:12:30,173 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:12:30,249 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-11-07 22:12:30,249 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:30,253 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:30,910 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-11-07 22:12:30,911 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:31,226 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-11-07 22:12:31,246 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:31,247 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 42 [2018-11-07 22:12:31,247 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:31,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-11-07 22:12:31,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-11-07 22:12:31,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=1303, Unknown=0, NotChecked=0, Total=1722 [2018-11-07 22:12:31,248 INFO L87 Difference]: Start difference. First operand 137 states and 138 transitions. Second operand 42 states. [2018-11-07 22:12:31,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:31,945 INFO L93 Difference]: Finished difference Result 200 states and 214 transitions. [2018-11-07 22:12:31,945 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-07 22:12:31,945 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 134 [2018-11-07 22:12:31,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:31,946 INFO L225 Difference]: With dead ends: 200 [2018-11-07 22:12:31,946 INFO L226 Difference]: Without dead ends: 139 [2018-11-07 22:12:31,948 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 230 SyntacticMatches, 26 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1130 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=748, Invalid=2332, Unknown=0, NotChecked=0, Total=3080 [2018-11-07 22:12:31,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-11-07 22:12:31,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2018-11-07 22:12:31,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-11-07 22:12:31,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2018-11-07 22:12:31,956 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 134 [2018-11-07 22:12:31,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:31,956 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2018-11-07 22:12:31,956 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-11-07 22:12:31,956 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2018-11-07 22:12:31,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2018-11-07 22:12:31,957 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:31,957 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:31,957 INFO L423 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:31,958 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:31,958 INFO L82 PathProgramCache]: Analyzing trace with hash -781662567, now seen corresponding path program 24 times [2018-11-07 22:12:31,958 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:31,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:31,959 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:31,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:31,959 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:31,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:32,219 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 205 proven. 334 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-11-07 22:12:32,219 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:32,219 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:32,220 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:32,220 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:32,220 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:32,220 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:32,231 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:12:32,231 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:12:32,271 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:12:32,271 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:32,275 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:32,327 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 206 proven. 300 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-11-07 22:12:32,327 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:32,588 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 206 proven. 300 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-11-07 22:12:32,609 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:32,609 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 21 [2018-11-07 22:12:32,609 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:32,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-07 22:12:32,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-07 22:12:32,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=288, Unknown=0, NotChecked=0, Total=420 [2018-11-07 22:12:32,610 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand 21 states. [2018-11-07 22:12:33,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:33,057 INFO L93 Difference]: Finished difference Result 149 states and 150 transitions. [2018-11-07 22:12:33,061 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-07 22:12:33,061 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 136 [2018-11-07 22:12:33,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:33,062 INFO L225 Difference]: With dead ends: 149 [2018-11-07 22:12:33,062 INFO L226 Difference]: Without dead ends: 147 [2018-11-07 22:12:33,062 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 258 SyntacticMatches, 27 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=145, Invalid=361, Unknown=0, NotChecked=0, Total=506 [2018-11-07 22:12:33,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-11-07 22:12:33,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2018-11-07 22:12:33,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-11-07 22:12:33,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 148 transitions. [2018-11-07 22:12:33,072 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 148 transitions. Word has length 136 [2018-11-07 22:12:33,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:33,073 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 148 transitions. [2018-11-07 22:12:33,073 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-07 22:12:33,073 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 148 transitions. [2018-11-07 22:12:33,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2018-11-07 22:12:33,074 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:33,074 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:33,075 INFO L423 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:33,075 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:33,075 INFO L82 PathProgramCache]: Analyzing trace with hash 720491197, now seen corresponding path program 25 times [2018-11-07 22:12:33,075 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:33,076 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:33,076 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:33,076 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:33,076 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:33,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:33,677 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-11-07 22:12:33,677 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:33,677 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:33,677 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:33,677 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:33,677 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:33,678 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:33,685 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:33,686 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:12:33,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:33,729 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:34,114 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-11-07 22:12:34,115 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:34,419 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-11-07 22:12:34,441 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:34,441 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 45 [2018-11-07 22:12:34,441 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:34,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-11-07 22:12:34,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-11-07 22:12:34,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=479, Invalid=1501, Unknown=0, NotChecked=0, Total=1980 [2018-11-07 22:12:34,442 INFO L87 Difference]: Start difference. First operand 147 states and 148 transitions. Second operand 45 states. [2018-11-07 22:12:36,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:36,425 INFO L93 Difference]: Finished difference Result 214 states and 229 transitions. [2018-11-07 22:12:36,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-11-07 22:12:36,425 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 144 [2018-11-07 22:12:36,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:36,426 INFO L225 Difference]: With dead ends: 214 [2018-11-07 22:12:36,427 INFO L226 Difference]: Without dead ends: 149 [2018-11-07 22:12:36,428 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 247 SyntacticMatches, 28 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1315 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=854, Invalid=2686, Unknown=0, NotChecked=0, Total=3540 [2018-11-07 22:12:36,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-11-07 22:12:36,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2018-11-07 22:12:36,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-11-07 22:12:36,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 150 transitions. [2018-11-07 22:12:36,436 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 150 transitions. Word has length 144 [2018-11-07 22:12:36,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:36,436 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 150 transitions. [2018-11-07 22:12:36,437 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-11-07 22:12:36,437 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 150 transitions. [2018-11-07 22:12:36,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-11-07 22:12:36,438 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:36,438 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:36,438 INFO L423 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:36,438 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:36,438 INFO L82 PathProgramCache]: Analyzing trace with hash -349719049, now seen corresponding path program 26 times [2018-11-07 22:12:36,438 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:36,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:36,439 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:36,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:36,439 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:36,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:37,385 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 235 proven. 388 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-11-07 22:12:37,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:37,385 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:37,385 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:37,385 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:37,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:37,386 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:37,396 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:12:37,397 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:12:37,491 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-07 22:12:37,491 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:37,494 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:37,600 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 236 proven. 351 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-11-07 22:12:37,600 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:37,926 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 236 proven. 351 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-11-07 22:12:37,945 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:37,946 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 22 [2018-11-07 22:12:37,946 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:37,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-07 22:12:37,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-07 22:12:37,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=314, Unknown=0, NotChecked=0, Total=462 [2018-11-07 22:12:37,947 INFO L87 Difference]: Start difference. First operand 149 states and 150 transitions. Second operand 22 states. [2018-11-07 22:12:38,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:38,199 INFO L93 Difference]: Finished difference Result 159 states and 160 transitions. [2018-11-07 22:12:38,199 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-07 22:12:38,199 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 146 [2018-11-07 22:12:38,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:38,201 INFO L225 Difference]: With dead ends: 159 [2018-11-07 22:12:38,201 INFO L226 Difference]: Without dead ends: 157 [2018-11-07 22:12:38,202 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 277 SyntacticMatches, 29 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=161, Invalid=391, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:12:38,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-11-07 22:12:38,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2018-11-07 22:12:38,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-11-07 22:12:38,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 158 transitions. [2018-11-07 22:12:38,210 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 158 transitions. Word has length 146 [2018-11-07 22:12:38,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:38,210 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 158 transitions. [2018-11-07 22:12:38,210 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-07 22:12:38,210 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 158 transitions. [2018-11-07 22:12:38,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2018-11-07 22:12:38,211 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:38,211 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:38,212 INFO L423 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:38,212 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:38,212 INFO L82 PathProgramCache]: Analyzing trace with hash -76381157, now seen corresponding path program 27 times [2018-11-07 22:12:38,212 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:38,212 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:38,212 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:38,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:38,213 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:38,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:38,702 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-11-07 22:12:38,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:38,703 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:38,703 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:38,703 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:38,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:38,703 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:38,712 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:12:38,712 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:12:38,755 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:12:38,756 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:38,760 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:39,369 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-11-07 22:12:39,369 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:39,860 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-11-07 22:12:39,880 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:39,880 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 48 [2018-11-07 22:12:39,880 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:39,881 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-11-07 22:12:39,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-11-07 22:12:39,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=543, Invalid=1713, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 22:12:39,882 INFO L87 Difference]: Start difference. First operand 157 states and 158 transitions. Second operand 48 states. [2018-11-07 22:12:41,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:41,850 INFO L93 Difference]: Finished difference Result 228 states and 244 transitions. [2018-11-07 22:12:41,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-11-07 22:12:41,850 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 154 [2018-11-07 22:12:41,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:41,851 INFO L225 Difference]: With dead ends: 228 [2018-11-07 22:12:41,852 INFO L226 Difference]: Without dead ends: 159 [2018-11-07 22:12:41,854 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 264 SyntacticMatches, 30 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1514 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=967, Invalid=3065, Unknown=0, NotChecked=0, Total=4032 [2018-11-07 22:12:41,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2018-11-07 22:12:41,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2018-11-07 22:12:41,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-11-07 22:12:41,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 160 transitions. [2018-11-07 22:12:41,862 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 160 transitions. Word has length 154 [2018-11-07 22:12:41,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:41,862 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 160 transitions. [2018-11-07 22:12:41,862 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-11-07 22:12:41,863 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 160 transitions. [2018-11-07 22:12:41,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-11-07 22:12:41,864 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:41,864 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:41,864 INFO L423 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:41,864 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:41,864 INFO L82 PathProgramCache]: Analyzing trace with hash 1136207573, now seen corresponding path program 28 times [2018-11-07 22:12:41,864 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:41,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:41,865 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:41,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:41,865 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:41,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:42,876 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 267 proven. 446 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-11-07 22:12:42,877 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:42,877 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:42,877 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:42,877 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:42,877 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:42,877 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:42,885 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:42,885 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:12:42,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:42,936 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:43,115 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 268 proven. 406 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-11-07 22:12:43,115 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:43,355 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 268 proven. 406 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-11-07 22:12:43,375 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:43,375 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 23 [2018-11-07 22:12:43,375 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:43,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-07 22:12:43,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-07 22:12:43,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=341, Unknown=0, NotChecked=0, Total=506 [2018-11-07 22:12:43,376 INFO L87 Difference]: Start difference. First operand 159 states and 160 transitions. Second operand 23 states. [2018-11-07 22:12:43,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:43,984 INFO L93 Difference]: Finished difference Result 169 states and 170 transitions. [2018-11-07 22:12:43,984 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-07 22:12:43,985 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 156 [2018-11-07 22:12:43,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:43,986 INFO L225 Difference]: With dead ends: 169 [2018-11-07 22:12:43,986 INFO L226 Difference]: Without dead ends: 167 [2018-11-07 22:12:43,987 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 296 SyntacticMatches, 31 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=178, Invalid=422, Unknown=0, NotChecked=0, Total=600 [2018-11-07 22:12:43,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2018-11-07 22:12:43,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 167. [2018-11-07 22:12:43,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-11-07 22:12:43,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 168 transitions. [2018-11-07 22:12:43,995 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 168 transitions. Word has length 156 [2018-11-07 22:12:43,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:43,996 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 168 transitions. [2018-11-07 22:12:43,996 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-07 22:12:43,996 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 168 transitions. [2018-11-07 22:12:43,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-11-07 22:12:43,997 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:43,997 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:43,997 INFO L423 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:43,997 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:43,997 INFO L82 PathProgramCache]: Analyzing trace with hash -1226033415, now seen corresponding path program 29 times [2018-11-07 22:12:43,998 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:43,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:43,998 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:43,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:43,999 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:44,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:44,453 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-11-07 22:12:44,453 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:44,453 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:44,453 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:44,453 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:44,453 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:44,453 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:44,462 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:12:44,462 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:12:44,682 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-11-07 22:12:44,682 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:44,686 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:45,283 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-11-07 22:12:45,284 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:45,676 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-11-07 22:12:45,696 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:45,696 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 51 [2018-11-07 22:12:45,696 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:45,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-11-07 22:12:45,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-11-07 22:12:45,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=611, Invalid=1939, Unknown=0, NotChecked=0, Total=2550 [2018-11-07 22:12:45,699 INFO L87 Difference]: Start difference. First operand 167 states and 168 transitions. Second operand 51 states. [2018-11-07 22:12:46,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:46,821 INFO L93 Difference]: Finished difference Result 242 states and 259 transitions. [2018-11-07 22:12:46,822 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-11-07 22:12:46,822 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 164 [2018-11-07 22:12:46,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:46,823 INFO L225 Difference]: With dead ends: 242 [2018-11-07 22:12:46,823 INFO L226 Difference]: Without dead ends: 169 [2018-11-07 22:12:46,825 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 379 GetRequests, 281 SyntacticMatches, 32 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1727 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1087, Invalid=3469, Unknown=0, NotChecked=0, Total=4556 [2018-11-07 22:12:46,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-11-07 22:12:46,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-11-07 22:12:46,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-11-07 22:12:46,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2018-11-07 22:12:46,838 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 164 [2018-11-07 22:12:46,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:46,838 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2018-11-07 22:12:46,838 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-11-07 22:12:46,838 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2018-11-07 22:12:46,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2018-11-07 22:12:46,839 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:46,839 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:46,840 INFO L423 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:46,840 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:46,840 INFO L82 PathProgramCache]: Analyzing trace with hash -956679885, now seen corresponding path program 30 times [2018-11-07 22:12:46,840 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:46,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:46,841 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:46,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:46,841 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:46,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:47,162 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 301 proven. 508 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-11-07 22:12:47,162 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:47,162 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:47,162 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:47,163 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:47,163 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:47,163 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:47,171 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:12:47,171 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:12:47,221 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:12:47,222 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:47,227 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:47,929 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 302 proven. 465 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-11-07 22:12:47,929 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:48,639 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 302 proven. 465 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-11-07 22:12:48,659 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:48,659 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 24 [2018-11-07 22:12:48,659 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:48,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-07 22:12:48,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-07 22:12:48,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=369, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:12:48,660 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand 24 states. [2018-11-07 22:12:49,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:49,143 INFO L93 Difference]: Finished difference Result 179 states and 180 transitions. [2018-11-07 22:12:49,144 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-07 22:12:49,144 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 166 [2018-11-07 22:12:49,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:49,146 INFO L225 Difference]: With dead ends: 179 [2018-11-07 22:12:49,146 INFO L226 Difference]: Without dead ends: 177 [2018-11-07 22:12:49,147 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 315 SyntacticMatches, 33 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 388 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=196, Invalid=454, Unknown=0, NotChecked=0, Total=650 [2018-11-07 22:12:49,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-11-07 22:12:49,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 177. [2018-11-07 22:12:49,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-11-07 22:12:49,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 178 transitions. [2018-11-07 22:12:49,163 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 178 transitions. Word has length 166 [2018-11-07 22:12:49,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:49,163 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 178 transitions. [2018-11-07 22:12:49,164 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-07 22:12:49,164 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 178 transitions. [2018-11-07 22:12:49,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-11-07 22:12:49,165 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:49,165 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:49,165 INFO L423 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:49,165 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:49,166 INFO L82 PathProgramCache]: Analyzing trace with hash -1441002665, now seen corresponding path program 31 times [2018-11-07 22:12:49,166 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:49,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:49,167 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:49,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:49,167 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:49,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:50,305 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-11-07 22:12:50,305 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:50,306 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:50,306 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:50,306 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:50,306 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:50,306 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:50,314 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:50,315 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:12:50,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:50,362 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:51,349 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-11-07 22:12:51,349 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:51,800 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-11-07 22:12:51,820 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:51,820 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 54 [2018-11-07 22:12:51,820 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:51,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-11-07 22:12:51,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-11-07 22:12:51,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=683, Invalid=2179, Unknown=0, NotChecked=0, Total=2862 [2018-11-07 22:12:51,822 INFO L87 Difference]: Start difference. First operand 177 states and 178 transitions. Second operand 54 states. [2018-11-07 22:12:53,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:53,033 INFO L93 Difference]: Finished difference Result 256 states and 274 transitions. [2018-11-07 22:12:53,033 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-11-07 22:12:53,033 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 174 [2018-11-07 22:12:53,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:53,035 INFO L225 Difference]: With dead ends: 256 [2018-11-07 22:12:53,035 INFO L226 Difference]: Without dead ends: 179 [2018-11-07 22:12:53,037 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 298 SyntacticMatches, 34 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1954 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1214, Invalid=3898, Unknown=0, NotChecked=0, Total=5112 [2018-11-07 22:12:53,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2018-11-07 22:12:53,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2018-11-07 22:12:53,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2018-11-07 22:12:53,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 180 transitions. [2018-11-07 22:12:53,048 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 180 transitions. Word has length 174 [2018-11-07 22:12:53,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:53,048 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 180 transitions. [2018-11-07 22:12:53,048 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-11-07 22:12:53,048 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 180 transitions. [2018-11-07 22:12:53,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-11-07 22:12:53,049 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:53,049 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:53,050 INFO L423 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:53,050 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:53,050 INFO L82 PathProgramCache]: Analyzing trace with hash 98569489, now seen corresponding path program 32 times [2018-11-07 22:12:53,050 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:53,051 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:53,051 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:53,051 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:53,051 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:53,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:53,375 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 337 proven. 574 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-11-07 22:12:53,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:53,375 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:53,376 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:53,376 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:53,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:53,376 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:53,385 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:12:53,385 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:12:53,447 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-11-07 22:12:53,447 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:53,451 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:53,523 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 338 proven. 528 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-11-07 22:12:53,524 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:53,817 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 338 proven. 528 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-11-07 22:12:53,837 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:53,838 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 25 [2018-11-07 22:12:53,838 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:53,838 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-07 22:12:53,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-07 22:12:53,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=398, Unknown=0, NotChecked=0, Total=600 [2018-11-07 22:12:53,839 INFO L87 Difference]: Start difference. First operand 179 states and 180 transitions. Second operand 25 states. [2018-11-07 22:12:54,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:54,071 INFO L93 Difference]: Finished difference Result 189 states and 190 transitions. [2018-11-07 22:12:54,071 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-07 22:12:54,071 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 176 [2018-11-07 22:12:54,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:54,072 INFO L225 Difference]: With dead ends: 189 [2018-11-07 22:12:54,072 INFO L226 Difference]: Without dead ends: 187 [2018-11-07 22:12:54,073 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 334 SyntacticMatches, 35 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 429 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=215, Invalid=487, Unknown=0, NotChecked=0, Total=702 [2018-11-07 22:12:54,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-11-07 22:12:54,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2018-11-07 22:12:54,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-11-07 22:12:54,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 188 transitions. [2018-11-07 22:12:54,082 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 188 transitions. Word has length 176 [2018-11-07 22:12:54,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:54,082 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 188 transitions. [2018-11-07 22:12:54,082 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-07 22:12:54,082 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 188 transitions. [2018-11-07 22:12:54,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2018-11-07 22:12:54,083 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:54,083 INFO L375 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:54,084 INFO L423 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:54,084 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:54,084 INFO L82 PathProgramCache]: Analyzing trace with hash 785850677, now seen corresponding path program 33 times [2018-11-07 22:12:54,084 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:54,085 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:54,085 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:54,085 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:54,085 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:54,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:54,686 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-11-07 22:12:54,687 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:54,687 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:54,687 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:54,687 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:54,687 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:54,687 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:54,695 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:12:54,695 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:12:54,746 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:12:54,746 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:54,750 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:55,642 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-11-07 22:12:55,642 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:56,139 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-11-07 22:12:56,158 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:56,159 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 57 [2018-11-07 22:12:56,159 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:56,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-11-07 22:12:56,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-11-07 22:12:56,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=759, Invalid=2433, Unknown=0, NotChecked=0, Total=3192 [2018-11-07 22:12:56,160 INFO L87 Difference]: Start difference. First operand 187 states and 188 transitions. Second operand 57 states. [2018-11-07 22:12:57,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:57,396 INFO L93 Difference]: Finished difference Result 270 states and 289 transitions. [2018-11-07 22:12:57,397 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-11-07 22:12:57,397 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 184 [2018-11-07 22:12:57,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:57,398 INFO L225 Difference]: With dead ends: 270 [2018-11-07 22:12:57,398 INFO L226 Difference]: Without dead ends: 189 [2018-11-07 22:12:57,401 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 315 SyntacticMatches, 36 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2195 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1348, Invalid=4352, Unknown=0, NotChecked=0, Total=5700 [2018-11-07 22:12:57,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2018-11-07 22:12:57,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 189. [2018-11-07 22:12:57,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-11-07 22:12:57,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 190 transitions. [2018-11-07 22:12:57,409 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 190 transitions. Word has length 184 [2018-11-07 22:12:57,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:57,410 INFO L480 AbstractCegarLoop]: Abstraction has 189 states and 190 transitions. [2018-11-07 22:12:57,414 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-11-07 22:12:57,414 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 190 transitions. [2018-11-07 22:12:57,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-11-07 22:12:57,415 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:57,416 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:57,416 INFO L423 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:57,416 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:57,416 INFO L82 PathProgramCache]: Analyzing trace with hash -1200110993, now seen corresponding path program 34 times [2018-11-07 22:12:57,416 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:57,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:57,417 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:12:57,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:57,417 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:57,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:57,758 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 375 proven. 644 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-11-07 22:12:57,758 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:57,758 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:57,759 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:57,759 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:57,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:57,759 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:57,767 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:57,768 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:12:57,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:57,821 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:12:57,966 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 376 proven. 595 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-11-07 22:12:57,966 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:12:58,395 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 376 proven. 595 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-11-07 22:12:58,416 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:12:58,416 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 26 [2018-11-07 22:12:58,416 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:12:58,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-07 22:12:58,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-07 22:12:58,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=428, Unknown=0, NotChecked=0, Total=650 [2018-11-07 22:12:58,417 INFO L87 Difference]: Start difference. First operand 189 states and 190 transitions. Second operand 26 states. [2018-11-07 22:12:58,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:12:58,683 INFO L93 Difference]: Finished difference Result 199 states and 200 transitions. [2018-11-07 22:12:58,683 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-07 22:12:58,684 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 186 [2018-11-07 22:12:58,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:12:58,685 INFO L225 Difference]: With dead ends: 199 [2018-11-07 22:12:58,686 INFO L226 Difference]: Without dead ends: 197 [2018-11-07 22:12:58,686 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 353 SyntacticMatches, 37 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 472 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=235, Invalid=521, Unknown=0, NotChecked=0, Total=756 [2018-11-07 22:12:58,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-11-07 22:12:58,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 197. [2018-11-07 22:12:58,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2018-11-07 22:12:58,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 198 transitions. [2018-11-07 22:12:58,694 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 198 transitions. Word has length 186 [2018-11-07 22:12:58,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:12:58,695 INFO L480 AbstractCegarLoop]: Abstraction has 197 states and 198 transitions. [2018-11-07 22:12:58,695 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-07 22:12:58,695 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 198 transitions. [2018-11-07 22:12:58,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-11-07 22:12:58,696 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:12:58,696 INFO L375 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 19, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:12:58,697 INFO L423 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:12:58,697 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:12:58,697 INFO L82 PathProgramCache]: Analyzing trace with hash 772446355, now seen corresponding path program 35 times [2018-11-07 22:12:58,697 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:12:58,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:58,698 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:12:58,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:12:58,698 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:12:58,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:12:59,368 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-11-07 22:12:59,368 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:59,368 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:12:59,369 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:12:59,369 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:12:59,369 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:12:59,369 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:12:59,377 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:12:59,377 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:12:59,442 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-11-07 22:12:59,443 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:12:59,447 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:00,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-11-07 22:13:00,136 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:00,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-11-07 22:13:00,658 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:00,659 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 60 [2018-11-07 22:13:00,659 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:00,659 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-11-07 22:13:00,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-11-07 22:13:00,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=839, Invalid=2701, Unknown=0, NotChecked=0, Total=3540 [2018-11-07 22:13:00,660 INFO L87 Difference]: Start difference. First operand 197 states and 198 transitions. Second operand 60 states. [2018-11-07 22:13:02,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:02,019 INFO L93 Difference]: Finished difference Result 284 states and 304 transitions. [2018-11-07 22:13:02,019 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-11-07 22:13:02,019 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 194 [2018-11-07 22:13:02,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:02,020 INFO L225 Difference]: With dead ends: 284 [2018-11-07 22:13:02,020 INFO L226 Difference]: Without dead ends: 199 [2018-11-07 22:13:02,022 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 448 GetRequests, 332 SyntacticMatches, 38 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2450 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1489, Invalid=4831, Unknown=0, NotChecked=0, Total=6320 [2018-11-07 22:13:02,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-11-07 22:13:02,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 199. [2018-11-07 22:13:02,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2018-11-07 22:13:02,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 200 transitions. [2018-11-07 22:13:02,032 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 200 transitions. Word has length 194 [2018-11-07 22:13:02,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:02,032 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 200 transitions. [2018-11-07 22:13:02,032 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-11-07 22:13:02,032 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 200 transitions. [2018-11-07 22:13:02,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2018-11-07 22:13:02,033 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:02,034 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:02,034 INFO L423 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:02,034 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:02,034 INFO L82 PathProgramCache]: Analyzing trace with hash -1075414707, now seen corresponding path program 36 times [2018-11-07 22:13:02,034 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:02,035 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:02,035 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:13:02,035 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:02,035 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:02,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:02,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 415 proven. 718 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-11-07 22:13:02,371 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:02,371 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:02,371 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:02,371 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:02,371 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:02,371 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:02,380 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:13:02,380 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:13:02,430 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:13:02,431 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:02,434 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:02,526 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 416 proven. 666 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-11-07 22:13:02,526 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:02,956 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 416 proven. 666 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-11-07 22:13:02,976 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:02,976 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 27 [2018-11-07 22:13:02,976 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:02,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-11-07 22:13:02,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-11-07 22:13:02,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=459, Unknown=0, NotChecked=0, Total=702 [2018-11-07 22:13:02,977 INFO L87 Difference]: Start difference. First operand 199 states and 200 transitions. Second operand 27 states. [2018-11-07 22:13:03,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:03,236 INFO L93 Difference]: Finished difference Result 209 states and 210 transitions. [2018-11-07 22:13:03,237 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-07 22:13:03,237 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 196 [2018-11-07 22:13:03,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:03,239 INFO L225 Difference]: With dead ends: 209 [2018-11-07 22:13:03,240 INFO L226 Difference]: Without dead ends: 207 [2018-11-07 22:13:03,240 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 372 SyntacticMatches, 39 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=256, Invalid=556, Unknown=0, NotChecked=0, Total=812 [2018-11-07 22:13:03,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2018-11-07 22:13:03,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2018-11-07 22:13:03,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-11-07 22:13:03,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 208 transitions. [2018-11-07 22:13:03,250 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 208 transitions. Word has length 196 [2018-11-07 22:13:03,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:03,250 INFO L480 AbstractCegarLoop]: Abstraction has 207 states and 208 transitions. [2018-11-07 22:13:03,250 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-11-07 22:13:03,250 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 208 transitions. [2018-11-07 22:13:03,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-11-07 22:13:03,252 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:03,252 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:03,252 INFO L423 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:03,252 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:03,252 INFO L82 PathProgramCache]: Analyzing trace with hash 565940593, now seen corresponding path program 37 times [2018-11-07 22:13:03,252 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:03,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:03,253 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:13:03,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:03,254 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:03,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:03,920 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-11-07 22:13:03,920 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:03,920 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:03,920 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:03,920 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:03,920 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:03,921 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:03,930 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:13:03,930 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:13:03,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:03,989 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:04,696 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-11-07 22:13:04,696 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:05,271 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-11-07 22:13:05,292 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:05,292 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 63 [2018-11-07 22:13:05,293 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:05,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-11-07 22:13:05,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-11-07 22:13:05,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=923, Invalid=2983, Unknown=0, NotChecked=0, Total=3906 [2018-11-07 22:13:05,294 INFO L87 Difference]: Start difference. First operand 207 states and 208 transitions. Second operand 63 states. [2018-11-07 22:13:06,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:06,825 INFO L93 Difference]: Finished difference Result 298 states and 319 transitions. [2018-11-07 22:13:06,825 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-11-07 22:13:06,825 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 204 [2018-11-07 22:13:06,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:06,826 INFO L225 Difference]: With dead ends: 298 [2018-11-07 22:13:06,826 INFO L226 Difference]: Without dead ends: 209 [2018-11-07 22:13:06,828 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 349 SyntacticMatches, 40 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2719 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1637, Invalid=5335, Unknown=0, NotChecked=0, Total=6972 [2018-11-07 22:13:06,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2018-11-07 22:13:06,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 209. [2018-11-07 22:13:06,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2018-11-07 22:13:06,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 210 transitions. [2018-11-07 22:13:06,838 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 210 transitions. Word has length 204 [2018-11-07 22:13:06,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:06,838 INFO L480 AbstractCegarLoop]: Abstraction has 209 states and 210 transitions. [2018-11-07 22:13:06,838 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-11-07 22:13:06,838 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 210 transitions. [2018-11-07 22:13:06,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-11-07 22:13:06,839 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:06,840 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:06,840 INFO L423 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:06,840 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:06,840 INFO L82 PathProgramCache]: Analyzing trace with hash -1469492821, now seen corresponding path program 38 times [2018-11-07 22:13:06,840 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:06,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:06,841 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:13:06,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:06,841 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:06,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:07,582 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 457 proven. 796 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-11-07 22:13:07,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:07,582 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:07,582 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:07,582 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:07,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:07,583 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:07,591 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:13:07,591 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:13:07,691 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-11-07 22:13:07,691 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:07,696 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:08,088 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 458 proven. 741 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-11-07 22:13:08,088 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:08,534 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 458 proven. 741 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-11-07 22:13:08,554 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:08,554 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 28 [2018-11-07 22:13:08,554 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:08,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-07 22:13:08,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-07 22:13:08,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=491, Unknown=0, NotChecked=0, Total=756 [2018-11-07 22:13:08,555 INFO L87 Difference]: Start difference. First operand 209 states and 210 transitions. Second operand 28 states. [2018-11-07 22:13:08,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:08,899 INFO L93 Difference]: Finished difference Result 219 states and 220 transitions. [2018-11-07 22:13:08,899 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-11-07 22:13:08,899 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 206 [2018-11-07 22:13:08,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:08,900 INFO L225 Difference]: With dead ends: 219 [2018-11-07 22:13:08,900 INFO L226 Difference]: Without dead ends: 217 [2018-11-07 22:13:08,900 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 391 SyntacticMatches, 41 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 564 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=278, Invalid=592, Unknown=0, NotChecked=0, Total=870 [2018-11-07 22:13:08,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2018-11-07 22:13:08,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 217. [2018-11-07 22:13:08,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2018-11-07 22:13:08,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 218 transitions. [2018-11-07 22:13:08,912 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 218 transitions. Word has length 206 [2018-11-07 22:13:08,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:08,913 INFO L480 AbstractCegarLoop]: Abstraction has 217 states and 218 transitions. [2018-11-07 22:13:08,913 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-07 22:13:08,913 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 218 transitions. [2018-11-07 22:13:08,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2018-11-07 22:13:08,914 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:08,914 INFO L375 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 21, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:08,915 INFO L423 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:08,915 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:08,915 INFO L82 PathProgramCache]: Analyzing trace with hash -1761137713, now seen corresponding path program 39 times [2018-11-07 22:13:08,915 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:08,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:08,916 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:13:08,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:08,916 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:08,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:11,929 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-11-07 22:13:11,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:11,930 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:11,930 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:11,930 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:11,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:11,930 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:11,938 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:13:11,938 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:13:11,996 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:13:11,996 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:12,000 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:12,787 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-11-07 22:13:12,787 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:13,392 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-11-07 22:13:13,423 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:13,423 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 66 [2018-11-07 22:13:13,423 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:13,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-11-07 22:13:13,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-11-07 22:13:13,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1011, Invalid=3279, Unknown=0, NotChecked=0, Total=4290 [2018-11-07 22:13:13,425 INFO L87 Difference]: Start difference. First operand 217 states and 218 transitions. Second operand 66 states. [2018-11-07 22:13:15,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:15,588 INFO L93 Difference]: Finished difference Result 312 states and 334 transitions. [2018-11-07 22:13:15,588 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-11-07 22:13:15,588 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 214 [2018-11-07 22:13:15,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:15,590 INFO L225 Difference]: With dead ends: 312 [2018-11-07 22:13:15,590 INFO L226 Difference]: Without dead ends: 219 [2018-11-07 22:13:15,591 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 366 SyntacticMatches, 42 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3002 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=1792, Invalid=5864, Unknown=0, NotChecked=0, Total=7656 [2018-11-07 22:13:15,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-11-07 22:13:15,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2018-11-07 22:13:15,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2018-11-07 22:13:15,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 220 transitions. [2018-11-07 22:13:15,602 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 220 transitions. Word has length 214 [2018-11-07 22:13:15,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:15,602 INFO L480 AbstractCegarLoop]: Abstraction has 219 states and 220 transitions. [2018-11-07 22:13:15,602 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-11-07 22:13:15,602 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 220 transitions. [2018-11-07 22:13:15,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2018-11-07 22:13:15,603 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:15,604 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:15,604 INFO L423 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:15,604 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:15,604 INFO L82 PathProgramCache]: Analyzing trace with hash -1420465271, now seen corresponding path program 40 times [2018-11-07 22:13:15,604 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:15,605 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:15,605 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:13:15,605 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:15,605 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:15,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:17,144 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 501 proven. 878 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2018-11-07 22:13:17,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:17,145 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:17,145 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:17,145 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:17,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:17,145 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:17,153 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:13:17,153 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:13:17,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:17,216 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:17,292 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 502 proven. 820 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-11-07 22:13:17,292 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:17,802 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 502 proven. 820 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-11-07 22:13:17,821 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:17,821 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 29 [2018-11-07 22:13:17,822 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:17,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-11-07 22:13:17,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-11-07 22:13:17,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=524, Unknown=0, NotChecked=0, Total=812 [2018-11-07 22:13:17,822 INFO L87 Difference]: Start difference. First operand 219 states and 220 transitions. Second operand 29 states. [2018-11-07 22:13:18,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:18,096 INFO L93 Difference]: Finished difference Result 229 states and 230 transitions. [2018-11-07 22:13:18,096 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-07 22:13:18,096 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 216 [2018-11-07 22:13:18,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:18,098 INFO L225 Difference]: With dead ends: 229 [2018-11-07 22:13:18,098 INFO L226 Difference]: Without dead ends: 227 [2018-11-07 22:13:18,099 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 410 SyntacticMatches, 43 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 613 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=301, Invalid=629, Unknown=0, NotChecked=0, Total=930 [2018-11-07 22:13:18,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2018-11-07 22:13:18,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 227. [2018-11-07 22:13:18,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 227 states. [2018-11-07 22:13:18,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 228 transitions. [2018-11-07 22:13:18,109 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 228 transitions. Word has length 216 [2018-11-07 22:13:18,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:18,109 INFO L480 AbstractCegarLoop]: Abstraction has 227 states and 228 transitions. [2018-11-07 22:13:18,109 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-11-07 22:13:18,109 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 228 transitions. [2018-11-07 22:13:18,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2018-11-07 22:13:18,110 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:18,111 INFO L375 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:18,111 INFO L423 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:18,111 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:18,111 INFO L82 PathProgramCache]: Analyzing trace with hash 807569325, now seen corresponding path program 41 times [2018-11-07 22:13:18,111 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:18,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:18,112 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:13:18,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:18,112 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:18,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:19,828 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-11-07 22:13:19,829 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:19,829 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:19,829 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:19,829 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:19,829 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:19,829 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:19,846 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:13:19,847 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:13:19,972 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-11-07 22:13:19,973 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:19,977 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:20,825 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-11-07 22:13:20,825 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:21,482 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-11-07 22:13:21,503 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:21,504 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 69 [2018-11-07 22:13:21,504 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:21,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-11-07 22:13:21,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-11-07 22:13:21,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1103, Invalid=3589, Unknown=0, NotChecked=0, Total=4692 [2018-11-07 22:13:21,505 INFO L87 Difference]: Start difference. First operand 227 states and 228 transitions. Second operand 69 states. [2018-11-07 22:13:23,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:23,384 INFO L93 Difference]: Finished difference Result 326 states and 349 transitions. [2018-11-07 22:13:23,384 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-11-07 22:13:23,385 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 224 [2018-11-07 22:13:23,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:23,386 INFO L225 Difference]: With dead ends: 326 [2018-11-07 22:13:23,386 INFO L226 Difference]: Without dead ends: 229 [2018-11-07 22:13:23,387 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 383 SyntacticMatches, 44 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3299 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=1954, Invalid=6418, Unknown=0, NotChecked=0, Total=8372 [2018-11-07 22:13:23,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2018-11-07 22:13:23,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 229. [2018-11-07 22:13:23,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2018-11-07 22:13:23,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 230 transitions. [2018-11-07 22:13:23,398 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 230 transitions. Word has length 224 [2018-11-07 22:13:23,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:23,398 INFO L480 AbstractCegarLoop]: Abstraction has 229 states and 230 transitions. [2018-11-07 22:13:23,399 INFO L481 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-11-07 22:13:23,399 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 230 transitions. [2018-11-07 22:13:23,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2018-11-07 22:13:23,400 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:23,400 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:23,400 INFO L423 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:23,401 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:23,401 INFO L82 PathProgramCache]: Analyzing trace with hash 823650023, now seen corresponding path program 42 times [2018-11-07 22:13:23,401 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:23,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:23,402 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:13:23,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:23,402 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:23,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:24,755 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 547 proven. 964 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2018-11-07 22:13:24,755 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:24,755 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:24,755 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:24,755 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:24,755 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:24,756 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:24,764 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:13:24,764 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:13:24,831 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:13:24,831 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:24,836 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:24,947 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 548 proven. 903 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-11-07 22:13:24,947 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:25,468 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 548 proven. 903 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-11-07 22:13:25,488 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:25,488 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27] total 30 [2018-11-07 22:13:25,488 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:25,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-11-07 22:13:25,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-11-07 22:13:25,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=558, Unknown=0, NotChecked=0, Total=870 [2018-11-07 22:13:25,489 INFO L87 Difference]: Start difference. First operand 229 states and 230 transitions. Second operand 30 states. [2018-11-07 22:13:25,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:25,807 INFO L93 Difference]: Finished difference Result 239 states and 240 transitions. [2018-11-07 22:13:25,807 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-07 22:13:25,807 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 226 [2018-11-07 22:13:25,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:25,809 INFO L225 Difference]: With dead ends: 239 [2018-11-07 22:13:25,809 INFO L226 Difference]: Without dead ends: 237 [2018-11-07 22:13:25,810 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 429 SyntacticMatches, 45 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 664 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=325, Invalid=667, Unknown=0, NotChecked=0, Total=992 [2018-11-07 22:13:25,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2018-11-07 22:13:25,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 237. [2018-11-07 22:13:25,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 237 states. [2018-11-07 22:13:25,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 238 transitions. [2018-11-07 22:13:25,821 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 238 transitions. Word has length 226 [2018-11-07 22:13:25,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:25,821 INFO L480 AbstractCegarLoop]: Abstraction has 237 states and 238 transitions. [2018-11-07 22:13:25,821 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-11-07 22:13:25,821 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 238 transitions. [2018-11-07 22:13:25,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2018-11-07 22:13:25,823 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:25,823 INFO L375 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 23, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:25,823 INFO L423 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:25,823 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:25,824 INFO L82 PathProgramCache]: Analyzing trace with hash 643482891, now seen corresponding path program 43 times [2018-11-07 22:13:25,824 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:25,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:25,824 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:13:25,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:25,825 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:25,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:26,751 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-11-07 22:13:26,752 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:26,752 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:26,752 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:26,752 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:26,752 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:26,752 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:26,765 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:13:26,765 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:13:26,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:26,836 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:28,041 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-11-07 22:13:28,041 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:28,810 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-11-07 22:13:28,830 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:28,830 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 72 [2018-11-07 22:13:28,830 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:28,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-11-07 22:13:28,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-11-07 22:13:28,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1199, Invalid=3913, Unknown=0, NotChecked=0, Total=5112 [2018-11-07 22:13:28,832 INFO L87 Difference]: Start difference. First operand 237 states and 238 transitions. Second operand 72 states. [2018-11-07 22:13:30,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:30,017 INFO L93 Difference]: Finished difference Result 340 states and 364 transitions. [2018-11-07 22:13:30,017 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-11-07 22:13:30,017 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 234 [2018-11-07 22:13:30,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:30,019 INFO L225 Difference]: With dead ends: 340 [2018-11-07 22:13:30,019 INFO L226 Difference]: Without dead ends: 239 [2018-11-07 22:13:30,021 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 540 GetRequests, 400 SyntacticMatches, 46 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3610 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2123, Invalid=6997, Unknown=0, NotChecked=0, Total=9120 [2018-11-07 22:13:30,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2018-11-07 22:13:30,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 239. [2018-11-07 22:13:30,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2018-11-07 22:13:30,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 240 transitions. [2018-11-07 22:13:30,032 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 240 transitions. Word has length 234 [2018-11-07 22:13:30,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:30,032 INFO L480 AbstractCegarLoop]: Abstraction has 239 states and 240 transitions. [2018-11-07 22:13:30,033 INFO L481 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-11-07 22:13:30,033 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 240 transitions. [2018-11-07 22:13:30,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2018-11-07 22:13:30,034 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:30,034 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:30,034 INFO L423 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:30,035 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:30,035 INFO L82 PathProgramCache]: Analyzing trace with hash -751443003, now seen corresponding path program 44 times [2018-11-07 22:13:30,035 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:30,035 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:30,036 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:13:30,036 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:30,036 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:30,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:30,776 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 595 proven. 1054 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-11-07 22:13:30,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:30,776 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:30,776 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:30,776 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:30,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:30,776 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:30,792 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:13:30,792 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:13:30,883 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-11-07 22:13:30,883 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:30,887 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:30,982 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 596 proven. 990 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-11-07 22:13:30,982 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:32,250 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 596 proven. 990 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-11-07 22:13:32,271 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:32,271 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 31 [2018-11-07 22:13:32,271 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:32,272 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-11-07 22:13:32,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-11-07 22:13:32,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=593, Unknown=0, NotChecked=0, Total=930 [2018-11-07 22:13:32,272 INFO L87 Difference]: Start difference. First operand 239 states and 240 transitions. Second operand 31 states. [2018-11-07 22:13:32,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:32,604 INFO L93 Difference]: Finished difference Result 249 states and 250 transitions. [2018-11-07 22:13:32,604 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-11-07 22:13:32,604 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 236 [2018-11-07 22:13:32,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:32,606 INFO L225 Difference]: With dead ends: 249 [2018-11-07 22:13:32,607 INFO L226 Difference]: Without dead ends: 247 [2018-11-07 22:13:32,607 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 448 SyntacticMatches, 47 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 717 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=350, Invalid=706, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 22:13:32,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-11-07 22:13:32,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 247. [2018-11-07 22:13:32,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2018-11-07 22:13:32,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 248 transitions. [2018-11-07 22:13:32,618 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 248 transitions. Word has length 236 [2018-11-07 22:13:32,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:32,618 INFO L480 AbstractCegarLoop]: Abstraction has 247 states and 248 transitions. [2018-11-07 22:13:32,619 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-11-07 22:13:32,619 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 248 transitions. [2018-11-07 22:13:32,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2018-11-07 22:13:32,620 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:32,620 INFO L375 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 24, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:32,620 INFO L423 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:32,621 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:32,621 INFO L82 PathProgramCache]: Analyzing trace with hash 1276445673, now seen corresponding path program 45 times [2018-11-07 22:13:32,621 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:32,621 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:32,622 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:13:32,622 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:32,622 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:32,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:33,582 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-11-07 22:13:33,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:33,582 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:33,582 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:33,582 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:33,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:33,582 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:33,593 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:13:33,593 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:13:33,663 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:13:33,664 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:33,668 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:34,691 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-11-07 22:13:34,692 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:35,764 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-11-07 22:13:35,784 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:35,784 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 75 [2018-11-07 22:13:35,784 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:35,785 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-11-07 22:13:35,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-11-07 22:13:35,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1299, Invalid=4251, Unknown=0, NotChecked=0, Total=5550 [2018-11-07 22:13:35,785 INFO L87 Difference]: Start difference. First operand 247 states and 248 transitions. Second operand 75 states. [2018-11-07 22:13:37,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:37,560 INFO L93 Difference]: Finished difference Result 354 states and 379 transitions. [2018-11-07 22:13:37,560 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-11-07 22:13:37,560 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 244 [2018-11-07 22:13:37,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:37,561 INFO L225 Difference]: With dead ends: 354 [2018-11-07 22:13:37,561 INFO L226 Difference]: Without dead ends: 249 [2018-11-07 22:13:37,563 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 563 GetRequests, 417 SyntacticMatches, 48 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3935 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2299, Invalid=7601, Unknown=0, NotChecked=0, Total=9900 [2018-11-07 22:13:37,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2018-11-07 22:13:37,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 249. [2018-11-07 22:13:37,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 249 states. [2018-11-07 22:13:37,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 250 transitions. [2018-11-07 22:13:37,573 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 250 transitions. Word has length 244 [2018-11-07 22:13:37,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:37,573 INFO L480 AbstractCegarLoop]: Abstraction has 249 states and 250 transitions. [2018-11-07 22:13:37,573 INFO L481 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-11-07 22:13:37,573 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 250 transitions. [2018-11-07 22:13:37,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2018-11-07 22:13:37,575 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:37,575 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:37,575 INFO L423 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:37,575 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:37,575 INFO L82 PathProgramCache]: Analyzing trace with hash -565411293, now seen corresponding path program 46 times [2018-11-07 22:13:37,575 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:37,576 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:37,576 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:13:37,576 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:37,576 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:37,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:38,067 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 645 proven. 1148 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2018-11-07 22:13:38,067 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:38,067 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:38,067 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:38,067 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:38,067 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:38,068 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:38,076 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:13:38,076 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:13:38,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:38,149 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:38,251 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 646 proven. 1081 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-11-07 22:13:38,251 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:38,834 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 646 proven. 1081 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-11-07 22:13:38,853 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:38,854 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 32 [2018-11-07 22:13:38,854 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:38,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-11-07 22:13:38,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-11-07 22:13:38,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=629, Unknown=0, NotChecked=0, Total=992 [2018-11-07 22:13:38,855 INFO L87 Difference]: Start difference. First operand 249 states and 250 transitions. Second operand 32 states. [2018-11-07 22:13:39,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:39,151 INFO L93 Difference]: Finished difference Result 259 states and 260 transitions. [2018-11-07 22:13:39,151 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-11-07 22:13:39,151 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 246 [2018-11-07 22:13:39,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:39,153 INFO L225 Difference]: With dead ends: 259 [2018-11-07 22:13:39,154 INFO L226 Difference]: Without dead ends: 257 [2018-11-07 22:13:39,154 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 467 SyntacticMatches, 49 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 772 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=376, Invalid=746, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 22:13:39,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2018-11-07 22:13:39,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 257. [2018-11-07 22:13:39,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 257 states. [2018-11-07 22:13:39,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 258 transitions. [2018-11-07 22:13:39,165 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 258 transitions. Word has length 246 [2018-11-07 22:13:39,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:39,165 INFO L480 AbstractCegarLoop]: Abstraction has 257 states and 258 transitions. [2018-11-07 22:13:39,165 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-11-07 22:13:39,166 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 258 transitions. [2018-11-07 22:13:39,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2018-11-07 22:13:39,167 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:39,167 INFO L375 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 25, 24, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:39,167 INFO L423 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:39,168 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:39,168 INFO L82 PathProgramCache]: Analyzing trace with hash -1899076537, now seen corresponding path program 47 times [2018-11-07 22:13:39,168 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:39,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:39,169 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:13:39,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:39,169 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:39,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:40,400 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-11-07 22:13:40,401 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:40,401 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:40,401 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:40,401 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:40,401 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:40,401 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:40,410 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:13:40,411 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:13:40,509 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-11-07 22:13:40,509 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:40,514 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:41,669 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-11-07 22:13:41,669 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:43,001 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-11-07 22:13:43,037 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:43,037 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 78 [2018-11-07 22:13:43,037 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:43,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 78 states [2018-11-07 22:13:43,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2018-11-07 22:13:43,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1403, Invalid=4603, Unknown=0, NotChecked=0, Total=6006 [2018-11-07 22:13:43,040 INFO L87 Difference]: Start difference. First operand 257 states and 258 transitions. Second operand 78 states. [2018-11-07 22:13:45,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:45,447 INFO L93 Difference]: Finished difference Result 368 states and 394 transitions. [2018-11-07 22:13:45,447 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-11-07 22:13:45,447 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 254 [2018-11-07 22:13:45,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:45,448 INFO L225 Difference]: With dead ends: 368 [2018-11-07 22:13:45,448 INFO L226 Difference]: Without dead ends: 259 [2018-11-07 22:13:45,450 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 434 SyntacticMatches, 50 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4274 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=2482, Invalid=8230, Unknown=0, NotChecked=0, Total=10712 [2018-11-07 22:13:45,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2018-11-07 22:13:45,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 259. [2018-11-07 22:13:45,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2018-11-07 22:13:45,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 260 transitions. [2018-11-07 22:13:45,462 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 260 transitions. Word has length 254 [2018-11-07 22:13:45,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:45,463 INFO L480 AbstractCegarLoop]: Abstraction has 259 states and 260 transitions. [2018-11-07 22:13:45,463 INFO L481 AbstractCegarLoop]: Interpolant automaton has 78 states. [2018-11-07 22:13:45,463 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 260 transitions. [2018-11-07 22:13:45,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 257 [2018-11-07 22:13:45,464 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:45,465 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:45,465 INFO L423 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:45,465 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:45,465 INFO L82 PathProgramCache]: Analyzing trace with hash 1410392577, now seen corresponding path program 48 times [2018-11-07 22:13:45,465 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:45,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:45,467 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:13:45,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:45,467 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:45,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:45,940 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 697 proven. 1246 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2018-11-07 22:13:45,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:45,940 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:45,940 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:45,940 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:45,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:45,941 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:45,949 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:13:45,949 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:13:46,027 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:13:46,027 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:46,032 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:46,823 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 698 proven. 1176 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-11-07 22:13:46,823 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:47,721 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 698 proven. 1176 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-11-07 22:13:47,743 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:47,743 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 33 [2018-11-07 22:13:47,743 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:47,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-11-07 22:13:47,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-11-07 22:13:47,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=390, Invalid=666, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 22:13:47,744 INFO L87 Difference]: Start difference. First operand 259 states and 260 transitions. Second operand 33 states. [2018-11-07 22:13:48,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:48,143 INFO L93 Difference]: Finished difference Result 269 states and 270 transitions. [2018-11-07 22:13:48,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-11-07 22:13:48,144 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 256 [2018-11-07 22:13:48,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:48,146 INFO L225 Difference]: With dead ends: 269 [2018-11-07 22:13:48,146 INFO L226 Difference]: Without dead ends: 267 [2018-11-07 22:13:48,146 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 486 SyntacticMatches, 51 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 829 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=403, Invalid=787, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 22:13:48,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2018-11-07 22:13:48,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 267. [2018-11-07 22:13:48,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 267 states. [2018-11-07 22:13:48,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 268 transitions. [2018-11-07 22:13:48,159 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 268 transitions. Word has length 256 [2018-11-07 22:13:48,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:48,159 INFO L480 AbstractCegarLoop]: Abstraction has 267 states and 268 transitions. [2018-11-07 22:13:48,159 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-11-07 22:13:48,160 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 268 transitions. [2018-11-07 22:13:48,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2018-11-07 22:13:48,161 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:48,161 INFO L375 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 26, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:48,162 INFO L423 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:48,162 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:48,162 INFO L82 PathProgramCache]: Analyzing trace with hash -115603931, now seen corresponding path program 49 times [2018-11-07 22:13:48,162 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:48,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:48,163 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:13:48,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:48,163 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:48,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:49,275 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-11-07 22:13:49,276 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:49,276 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:49,276 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:49,276 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:49,276 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:49,276 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:49,288 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:13:49,288 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:13:49,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:49,368 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:50,553 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-11-07 22:13:50,553 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:51,543 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-11-07 22:13:51,564 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:51,564 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 81 [2018-11-07 22:13:51,564 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:51,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 81 states [2018-11-07 22:13:51,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2018-11-07 22:13:51,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1511, Invalid=4969, Unknown=0, NotChecked=0, Total=6480 [2018-11-07 22:13:51,565 INFO L87 Difference]: Start difference. First operand 267 states and 268 transitions. Second operand 81 states. [2018-11-07 22:13:53,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:53,849 INFO L93 Difference]: Finished difference Result 382 states and 409 transitions. [2018-11-07 22:13:53,856 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-11-07 22:13:53,856 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 264 [2018-11-07 22:13:53,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:53,858 INFO L225 Difference]: With dead ends: 382 [2018-11-07 22:13:53,858 INFO L226 Difference]: Without dead ends: 269 [2018-11-07 22:13:53,859 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 609 GetRequests, 451 SyntacticMatches, 52 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4627 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=2672, Invalid=8884, Unknown=0, NotChecked=0, Total=11556 [2018-11-07 22:13:53,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2018-11-07 22:13:53,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 269. [2018-11-07 22:13:53,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2018-11-07 22:13:53,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 270 transitions. [2018-11-07 22:13:53,870 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 270 transitions. Word has length 264 [2018-11-07 22:13:53,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:53,870 INFO L480 AbstractCegarLoop]: Abstraction has 269 states and 270 transitions. [2018-11-07 22:13:53,870 INFO L481 AbstractCegarLoop]: Interpolant automaton has 81 states. [2018-11-07 22:13:53,870 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 270 transitions. [2018-11-07 22:13:53,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2018-11-07 22:13:53,871 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:53,871 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:53,872 INFO L423 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:53,872 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:53,872 INFO L82 PathProgramCache]: Analyzing trace with hash 1833968479, now seen corresponding path program 50 times [2018-11-07 22:13:53,872 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:53,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:53,872 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:13:53,873 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:53,873 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:53,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:54,559 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 751 proven. 1348 refuted. 0 times theorem prover too weak. 1128 trivial. 0 not checked. [2018-11-07 22:13:54,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:54,560 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:54,560 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:54,560 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:54,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:54,560 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:54,569 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:13:54,569 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:13:54,669 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-11-07 22:13:54,669 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:54,674 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:54,774 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 752 proven. 1275 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-11-07 22:13:54,775 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:55,687 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 752 proven. 1275 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-11-07 22:13:55,706 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:55,707 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 34 [2018-11-07 22:13:55,707 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:55,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-11-07 22:13:55,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-11-07 22:13:55,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=418, Invalid=704, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 22:13:55,708 INFO L87 Difference]: Start difference. First operand 269 states and 270 transitions. Second operand 34 states. [2018-11-07 22:13:56,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:13:56,071 INFO L93 Difference]: Finished difference Result 279 states and 280 transitions. [2018-11-07 22:13:56,072 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-11-07 22:13:56,072 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 266 [2018-11-07 22:13:56,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:13:56,074 INFO L225 Difference]: With dead ends: 279 [2018-11-07 22:13:56,074 INFO L226 Difference]: Without dead ends: 277 [2018-11-07 22:13:56,074 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 505 SyntacticMatches, 53 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 888 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=431, Invalid=829, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 22:13:56,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2018-11-07 22:13:56,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 277. [2018-11-07 22:13:56,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 277 states. [2018-11-07 22:13:56,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 278 transitions. [2018-11-07 22:13:56,087 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 278 transitions. Word has length 266 [2018-11-07 22:13:56,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:13:56,087 INFO L480 AbstractCegarLoop]: Abstraction has 277 states and 278 transitions. [2018-11-07 22:13:56,087 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-11-07 22:13:56,087 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 278 transitions. [2018-11-07 22:13:56,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2018-11-07 22:13:56,089 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:13:56,089 INFO L375 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 27, 26, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:13:56,089 INFO L423 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:13:56,089 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:13:56,090 INFO L82 PathProgramCache]: Analyzing trace with hash 883624323, now seen corresponding path program 51 times [2018-11-07 22:13:56,090 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:13:56,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:56,090 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:13:56,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:13:56,091 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:13:56,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:13:57,220 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-11-07 22:13:57,220 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:57,220 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:13:57,221 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:13:57,221 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:13:57,221 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:13:57,221 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:13:57,229 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:13:57,229 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:13:57,308 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:13:57,309 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:13:57,314 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:13:58,905 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-11-07 22:13:58,905 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:13:59,857 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-11-07 22:13:59,877 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:13:59,877 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 84 [2018-11-07 22:13:59,877 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:13:59,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 84 states [2018-11-07 22:13:59,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2018-11-07 22:13:59,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1623, Invalid=5349, Unknown=0, NotChecked=0, Total=6972 [2018-11-07 22:13:59,879 INFO L87 Difference]: Start difference. First operand 277 states and 278 transitions. Second operand 84 states. [2018-11-07 22:14:01,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:01,237 INFO L93 Difference]: Finished difference Result 396 states and 424 transitions. [2018-11-07 22:14:01,237 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-11-07 22:14:01,237 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 274 [2018-11-07 22:14:01,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:01,239 INFO L225 Difference]: With dead ends: 396 [2018-11-07 22:14:01,239 INFO L226 Difference]: Without dead ends: 279 [2018-11-07 22:14:01,240 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 632 GetRequests, 468 SyntacticMatches, 54 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4994 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=2869, Invalid=9563, Unknown=0, NotChecked=0, Total=12432 [2018-11-07 22:14:01,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2018-11-07 22:14:01,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 279. [2018-11-07 22:14:01,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 279 states. [2018-11-07 22:14:01,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 280 transitions. [2018-11-07 22:14:01,250 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 280 transitions. Word has length 274 [2018-11-07 22:14:01,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:01,251 INFO L480 AbstractCegarLoop]: Abstraction has 279 states and 280 transitions. [2018-11-07 22:14:01,251 INFO L481 AbstractCegarLoop]: Interpolant automaton has 84 states. [2018-11-07 22:14:01,251 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 280 transitions. [2018-11-07 22:14:01,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2018-11-07 22:14:01,252 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:01,253 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:01,253 INFO L423 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:01,253 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:01,253 INFO L82 PathProgramCache]: Analyzing trace with hash -1678809539, now seen corresponding path program 52 times [2018-11-07 22:14:01,253 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:01,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:01,254 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:14:01,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:01,254 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:01,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:01,772 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 807 proven. 1454 refuted. 0 times theorem prover too weak. 1225 trivial. 0 not checked. [2018-11-07 22:14:01,772 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:01,772 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:01,773 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:01,773 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:01,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:01,773 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:14:01,781 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:01,781 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:14:01,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:01,861 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:01,963 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 808 proven. 1378 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-11-07 22:14:01,963 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:02,628 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 808 proven. 1378 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-11-07 22:14:02,648 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:02,649 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 35 [2018-11-07 22:14:02,649 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:02,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-11-07 22:14:02,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-11-07 22:14:02,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=447, Invalid=743, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 22:14:02,650 INFO L87 Difference]: Start difference. First operand 279 states and 280 transitions. Second operand 35 states. [2018-11-07 22:14:03,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:03,189 INFO L93 Difference]: Finished difference Result 289 states and 290 transitions. [2018-11-07 22:14:03,190 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-11-07 22:14:03,190 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 276 [2018-11-07 22:14:03,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:03,192 INFO L225 Difference]: With dead ends: 289 [2018-11-07 22:14:03,192 INFO L226 Difference]: Without dead ends: 287 [2018-11-07 22:14:03,193 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 614 GetRequests, 524 SyntacticMatches, 55 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 949 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=460, Invalid=872, Unknown=0, NotChecked=0, Total=1332 [2018-11-07 22:14:03,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2018-11-07 22:14:03,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 287. [2018-11-07 22:14:03,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2018-11-07 22:14:03,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 288 transitions. [2018-11-07 22:14:03,204 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 288 transitions. Word has length 276 [2018-11-07 22:14:03,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:03,205 INFO L480 AbstractCegarLoop]: Abstraction has 287 states and 288 transitions. [2018-11-07 22:14:03,205 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-11-07 22:14:03,205 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 288 transitions. [2018-11-07 22:14:03,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2018-11-07 22:14:03,207 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:03,207 INFO L375 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 28, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:03,207 INFO L423 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:03,207 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:03,207 INFO L82 PathProgramCache]: Analyzing trace with hash -1941926303, now seen corresponding path program 53 times [2018-11-07 22:14:03,208 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:03,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:03,208 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:03,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:03,209 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:03,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:04,480 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-11-07 22:14:04,480 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:04,480 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:04,480 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:04,481 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:04,481 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:04,481 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:14:04,490 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:14:04,490 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:14:04,603 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-11-07 22:14:04,603 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:14:04,609 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:05,908 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-11-07 22:14:05,908 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:06,935 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-11-07 22:14:06,955 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:06,956 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 87 [2018-11-07 22:14:06,956 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:06,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-11-07 22:14:06,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-11-07 22:14:06,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1739, Invalid=5743, Unknown=0, NotChecked=0, Total=7482 [2018-11-07 22:14:06,957 INFO L87 Difference]: Start difference. First operand 287 states and 288 transitions. Second operand 87 states. [2018-11-07 22:14:08,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:08,578 INFO L93 Difference]: Finished difference Result 410 states and 439 transitions. [2018-11-07 22:14:08,578 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-11-07 22:14:08,578 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 284 [2018-11-07 22:14:08,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:08,579 INFO L225 Difference]: With dead ends: 410 [2018-11-07 22:14:08,579 INFO L226 Difference]: Without dead ends: 289 [2018-11-07 22:14:08,581 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 655 GetRequests, 485 SyntacticMatches, 56 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5375 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3073, Invalid=10267, Unknown=0, NotChecked=0, Total=13340 [2018-11-07 22:14:08,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2018-11-07 22:14:08,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2018-11-07 22:14:08,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 289 states. [2018-11-07 22:14:08,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 290 transitions. [2018-11-07 22:14:08,595 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 290 transitions. Word has length 284 [2018-11-07 22:14:08,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:08,595 INFO L480 AbstractCegarLoop]: Abstraction has 289 states and 290 transitions. [2018-11-07 22:14:08,595 INFO L481 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-11-07 22:14:08,595 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 290 transitions. [2018-11-07 22:14:08,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2018-11-07 22:14:08,597 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:08,597 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 28, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:08,597 INFO L423 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:08,597 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:08,598 INFO L82 PathProgramCache]: Analyzing trace with hash 216779419, now seen corresponding path program 54 times [2018-11-07 22:14:08,598 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:08,598 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:08,598 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:14:08,598 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:08,599 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:08,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:09,122 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 865 proven. 1564 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2018-11-07 22:14:09,122 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:09,122 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:09,122 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:09,122 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:09,123 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:09,123 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:14:09,131 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:14:09,132 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:14:09,205 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:14:09,205 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:14:09,210 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:09,319 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 866 proven. 1485 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-11-07 22:14:09,319 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:10,020 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 866 proven. 1485 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-11-07 22:14:10,039 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:10,040 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33] total 36 [2018-11-07 22:14:10,040 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:10,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-11-07 22:14:10,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-11-07 22:14:10,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=783, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 22:14:10,041 INFO L87 Difference]: Start difference. First operand 289 states and 290 transitions. Second operand 36 states. [2018-11-07 22:14:10,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:10,378 INFO L93 Difference]: Finished difference Result 299 states and 300 transitions. [2018-11-07 22:14:10,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-11-07 22:14:10,379 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 286 [2018-11-07 22:14:10,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:10,381 INFO L225 Difference]: With dead ends: 299 [2018-11-07 22:14:10,381 INFO L226 Difference]: Without dead ends: 297 [2018-11-07 22:14:10,381 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 636 GetRequests, 543 SyntacticMatches, 57 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1012 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=490, Invalid=916, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 22:14:10,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2018-11-07 22:14:10,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 297. [2018-11-07 22:14:10,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 297 states. [2018-11-07 22:14:10,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 298 transitions. [2018-11-07 22:14:10,394 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 298 transitions. Word has length 286 [2018-11-07 22:14:10,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:10,394 INFO L480 AbstractCegarLoop]: Abstraction has 297 states and 298 transitions. [2018-11-07 22:14:10,394 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-11-07 22:14:10,394 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 298 transitions. [2018-11-07 22:14:10,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2018-11-07 22:14:10,396 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:10,396 INFO L375 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 29, 28, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:10,396 INFO L423 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:10,397 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:10,397 INFO L82 PathProgramCache]: Analyzing trace with hash 1840886975, now seen corresponding path program 55 times [2018-11-07 22:14:10,397 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:10,397 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:10,398 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:14:10,398 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:10,398 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:10,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:11,622 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-11-07 22:14:11,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:11,622 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:11,623 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:11,623 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:11,623 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:11,623 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:14:11,647 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:11,647 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:14:11,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:11,733 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:13,417 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-11-07 22:14:13,417 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:14,642 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-11-07 22:14:14,661 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:14,661 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 90 [2018-11-07 22:14:14,662 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:14,662 INFO L459 AbstractCegarLoop]: Interpolant automaton has 90 states [2018-11-07 22:14:14,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2018-11-07 22:14:14,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1859, Invalid=6151, Unknown=0, NotChecked=0, Total=8010 [2018-11-07 22:14:14,663 INFO L87 Difference]: Start difference. First operand 297 states and 298 transitions. Second operand 90 states. [2018-11-07 22:14:16,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:16,525 INFO L93 Difference]: Finished difference Result 424 states and 454 transitions. [2018-11-07 22:14:16,525 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-11-07 22:14:16,525 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 294 [2018-11-07 22:14:16,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:16,526 INFO L225 Difference]: With dead ends: 424 [2018-11-07 22:14:16,526 INFO L226 Difference]: Without dead ends: 299 [2018-11-07 22:14:16,527 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 678 GetRequests, 502 SyntacticMatches, 58 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5770 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=3284, Invalid=10996, Unknown=0, NotChecked=0, Total=14280 [2018-11-07 22:14:16,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2018-11-07 22:14:16,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 299. [2018-11-07 22:14:16,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 299 states. [2018-11-07 22:14:16,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 300 transitions. [2018-11-07 22:14:16,540 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 300 transitions. Word has length 294 [2018-11-07 22:14:16,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:16,540 INFO L480 AbstractCegarLoop]: Abstraction has 299 states and 300 transitions. [2018-11-07 22:14:16,541 INFO L481 AbstractCegarLoop]: Interpolant automaton has 90 states. [2018-11-07 22:14:16,541 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 300 transitions. [2018-11-07 22:14:16,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2018-11-07 22:14:16,542 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:16,542 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:16,543 INFO L423 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:16,543 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:16,543 INFO L82 PathProgramCache]: Analyzing trace with hash -1436913543, now seen corresponding path program 56 times [2018-11-07 22:14:16,543 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:16,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:16,544 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:16,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:16,544 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:16,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:17,454 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 925 proven. 1678 refuted. 0 times theorem prover too weak. 1431 trivial. 0 not checked. [2018-11-07 22:14:17,455 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:17,455 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:17,455 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:17,455 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:17,455 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:17,455 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:14:17,463 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:14:17,463 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:14:17,581 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-11-07 22:14:17,581 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:14:17,586 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:17,696 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 926 proven. 1596 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-11-07 22:14:17,696 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:18,755 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 926 proven. 1596 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-11-07 22:14:18,775 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:18,776 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 37 [2018-11-07 22:14:18,776 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:18,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-11-07 22:14:18,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-11-07 22:14:18,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=508, Invalid=824, Unknown=0, NotChecked=0, Total=1332 [2018-11-07 22:14:18,777 INFO L87 Difference]: Start difference. First operand 299 states and 300 transitions. Second operand 37 states. [2018-11-07 22:14:19,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:19,209 INFO L93 Difference]: Finished difference Result 309 states and 310 transitions. [2018-11-07 22:14:19,210 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-11-07 22:14:19,210 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 296 [2018-11-07 22:14:19,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:19,212 INFO L225 Difference]: With dead ends: 309 [2018-11-07 22:14:19,212 INFO L226 Difference]: Without dead ends: 307 [2018-11-07 22:14:19,212 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 658 GetRequests, 562 SyntacticMatches, 59 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1077 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=521, Invalid=961, Unknown=0, NotChecked=0, Total=1482 [2018-11-07 22:14:19,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2018-11-07 22:14:19,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 307. [2018-11-07 22:14:19,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 307 states. [2018-11-07 22:14:19,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 308 transitions. [2018-11-07 22:14:19,222 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 308 transitions. Word has length 296 [2018-11-07 22:14:19,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:19,222 INFO L480 AbstractCegarLoop]: Abstraction has 307 states and 308 transitions. [2018-11-07 22:14:19,222 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-11-07 22:14:19,222 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 308 transitions. [2018-11-07 22:14:19,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2018-11-07 22:14:19,224 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:19,224 INFO L375 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 30, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:19,224 INFO L423 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:19,225 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:19,225 INFO L82 PathProgramCache]: Analyzing trace with hash 1812700317, now seen corresponding path program 57 times [2018-11-07 22:14:19,225 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:19,225 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:19,225 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:14:19,226 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:19,226 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:19,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:20,554 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-11-07 22:14:20,555 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:20,555 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:20,555 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:20,555 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:20,555 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:20,555 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:14:20,564 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:14:20,564 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:14:20,652 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:14:20,652 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:14:20,658 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:22,137 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-11-07 22:14:22,138 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:23,545 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-11-07 22:14:23,565 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:23,565 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 93 [2018-11-07 22:14:23,566 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:23,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 93 states [2018-11-07 22:14:23,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2018-11-07 22:14:23,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1983, Invalid=6573, Unknown=0, NotChecked=0, Total=8556 [2018-11-07 22:14:23,567 INFO L87 Difference]: Start difference. First operand 307 states and 308 transitions. Second operand 93 states. [2018-11-07 22:14:25,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:25,524 INFO L93 Difference]: Finished difference Result 438 states and 469 transitions. [2018-11-07 22:14:25,525 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-11-07 22:14:25,525 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 304 [2018-11-07 22:14:25,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:25,526 INFO L225 Difference]: With dead ends: 438 [2018-11-07 22:14:25,526 INFO L226 Difference]: Without dead ends: 309 [2018-11-07 22:14:25,528 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 701 GetRequests, 519 SyntacticMatches, 60 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6179 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3502, Invalid=11750, Unknown=0, NotChecked=0, Total=15252 [2018-11-07 22:14:25,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2018-11-07 22:14:25,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 309. [2018-11-07 22:14:25,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 309 states. [2018-11-07 22:14:25,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 310 transitions. [2018-11-07 22:14:25,543 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 310 transitions. Word has length 304 [2018-11-07 22:14:25,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:25,543 INFO L480 AbstractCegarLoop]: Abstraction has 309 states and 310 transitions. [2018-11-07 22:14:25,543 INFO L481 AbstractCegarLoop]: Interpolant automaton has 93 states. [2018-11-07 22:14:25,543 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 310 transitions. [2018-11-07 22:14:25,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2018-11-07 22:14:25,545 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:25,545 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 30, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:25,545 INFO L423 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:25,546 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:25,546 INFO L82 PathProgramCache]: Analyzing trace with hash -1654097961, now seen corresponding path program 58 times [2018-11-07 22:14:25,546 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:25,546 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:25,547 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:14:25,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:25,547 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:25,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:26,094 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 987 proven. 1796 refuted. 0 times theorem prover too weak. 1540 trivial. 0 not checked. [2018-11-07 22:14:26,094 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:26,095 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:26,095 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:26,095 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:26,095 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:26,095 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:14:26,103 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:26,104 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:14:26,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:26,194 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:26,312 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 988 proven. 1711 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-11-07 22:14:26,313 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:27,131 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 988 proven. 1711 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-11-07 22:14:27,150 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:27,151 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 38 [2018-11-07 22:14:27,151 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:27,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-11-07 22:14:27,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-11-07 22:14:27,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=866, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 22:14:27,152 INFO L87 Difference]: Start difference. First operand 309 states and 310 transitions. Second operand 38 states. [2018-11-07 22:14:27,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:27,581 INFO L93 Difference]: Finished difference Result 319 states and 320 transitions. [2018-11-07 22:14:27,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-11-07 22:14:27,582 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 306 [2018-11-07 22:14:27,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:27,584 INFO L225 Difference]: With dead ends: 319 [2018-11-07 22:14:27,584 INFO L226 Difference]: Without dead ends: 317 [2018-11-07 22:14:27,584 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 680 GetRequests, 581 SyntacticMatches, 61 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1144 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=553, Invalid=1007, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 22:14:27,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2018-11-07 22:14:27,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 317. [2018-11-07 22:14:27,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 317 states. [2018-11-07 22:14:27,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 318 transitions. [2018-11-07 22:14:27,594 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 318 transitions. Word has length 306 [2018-11-07 22:14:27,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:27,594 INFO L480 AbstractCegarLoop]: Abstraction has 317 states and 318 transitions. [2018-11-07 22:14:27,594 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-11-07 22:14:27,594 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 318 transitions. [2018-11-07 22:14:27,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2018-11-07 22:14:27,596 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:27,596 INFO L375 BasicCegarLoop]: trace histogram [31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:27,596 INFO L423 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:27,596 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:27,596 INFO L82 PathProgramCache]: Analyzing trace with hash -1052547589, now seen corresponding path program 59 times [2018-11-07 22:14:27,597 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:27,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:27,597 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:27,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:27,598 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:27,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:29,479 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-11-07 22:14:29,479 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:29,479 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:29,479 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:29,479 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:29,479 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:29,479 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:14:29,487 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:14:29,487 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:14:29,609 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2018-11-07 22:14:29,609 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:14:29,614 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:31,362 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-11-07 22:14:31,363 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:32,647 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-11-07 22:14:32,669 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:32,670 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 96 [2018-11-07 22:14:32,670 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:32,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2018-11-07 22:14:32,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2018-11-07 22:14:32,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2111, Invalid=7009, Unknown=0, NotChecked=0, Total=9120 [2018-11-07 22:14:32,671 INFO L87 Difference]: Start difference. First operand 317 states and 318 transitions. Second operand 96 states. [2018-11-07 22:14:34,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:34,951 INFO L93 Difference]: Finished difference Result 452 states and 484 transitions. [2018-11-07 22:14:34,957 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-11-07 22:14:34,957 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 314 [2018-11-07 22:14:34,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:34,959 INFO L225 Difference]: With dead ends: 452 [2018-11-07 22:14:34,959 INFO L226 Difference]: Without dead ends: 319 [2018-11-07 22:14:34,960 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 724 GetRequests, 536 SyntacticMatches, 62 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6602 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=3727, Invalid=12529, Unknown=0, NotChecked=0, Total=16256 [2018-11-07 22:14:34,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2018-11-07 22:14:34,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 319. [2018-11-07 22:14:34,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 319 states. [2018-11-07 22:14:34,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 320 transitions. [2018-11-07 22:14:34,971 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 320 transitions. Word has length 314 [2018-11-07 22:14:34,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:34,972 INFO L480 AbstractCegarLoop]: Abstraction has 319 states and 320 transitions. [2018-11-07 22:14:34,972 INFO L481 AbstractCegarLoop]: Interpolant automaton has 96 states. [2018-11-07 22:14:34,972 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 320 transitions. [2018-11-07 22:14:34,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2018-11-07 22:14:34,973 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:34,973 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 31, 31, 31, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:34,973 INFO L423 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:34,973 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:34,974 INFO L82 PathProgramCache]: Analyzing trace with hash 1348141237, now seen corresponding path program 60 times [2018-11-07 22:14:34,974 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:34,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:34,974 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:14:34,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:34,974 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:34,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:35,651 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1051 proven. 1918 refuted. 0 times theorem prover too weak. 1653 trivial. 0 not checked. [2018-11-07 22:14:35,651 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:35,651 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:35,651 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:35,651 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:35,651 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:35,651 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:14:35,660 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:14:35,660 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:14:35,749 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:14:35,749 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:14:35,755 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:35,874 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1052 proven. 1830 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-11-07 22:14:35,874 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:36,981 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1052 proven. 1830 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-11-07 22:14:37,001 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:37,001 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36, 36] total 39 [2018-11-07 22:14:37,001 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:37,001 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-11-07 22:14:37,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-11-07 22:14:37,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=909, Unknown=0, NotChecked=0, Total=1482 [2018-11-07 22:14:37,002 INFO L87 Difference]: Start difference. First operand 319 states and 320 transitions. Second operand 39 states. [2018-11-07 22:14:37,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:37,491 INFO L93 Difference]: Finished difference Result 329 states and 330 transitions. [2018-11-07 22:14:37,491 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-11-07 22:14:37,491 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 316 [2018-11-07 22:14:37,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:37,494 INFO L225 Difference]: With dead ends: 329 [2018-11-07 22:14:37,494 INFO L226 Difference]: Without dead ends: 327 [2018-11-07 22:14:37,494 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 702 GetRequests, 600 SyntacticMatches, 63 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1213 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=586, Invalid=1054, Unknown=0, NotChecked=0, Total=1640 [2018-11-07 22:14:37,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2018-11-07 22:14:37,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 327. [2018-11-07 22:14:37,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 327 states. [2018-11-07 22:14:37,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 328 transitions. [2018-11-07 22:14:37,507 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 328 transitions. Word has length 316 [2018-11-07 22:14:37,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:37,508 INFO L480 AbstractCegarLoop]: Abstraction has 327 states and 328 transitions. [2018-11-07 22:14:37,508 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-11-07 22:14:37,508 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 328 transitions. [2018-11-07 22:14:37,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2018-11-07 22:14:37,510 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:37,510 INFO L375 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 32, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:37,510 INFO L423 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:37,510 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:37,510 INFO L82 PathProgramCache]: Analyzing trace with hash 1350971609, now seen corresponding path program 61 times [2018-11-07 22:14:37,511 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:37,511 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:37,511 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:14:37,511 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:37,511 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:37,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:39,342 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-11-07 22:14:39,342 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:39,342 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:39,342 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:39,342 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:39,343 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:39,343 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:14:39,350 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:39,350 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:14:39,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:39,443 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:41,281 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-11-07 22:14:41,281 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:42,627 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-11-07 22:14:42,648 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:42,649 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 99 [2018-11-07 22:14:42,649 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:42,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-11-07 22:14:42,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-11-07 22:14:42,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2243, Invalid=7459, Unknown=0, NotChecked=0, Total=9702 [2018-11-07 22:14:42,651 INFO L87 Difference]: Start difference. First operand 327 states and 328 transitions. Second operand 99 states. [2018-11-07 22:14:45,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:45,135 INFO L93 Difference]: Finished difference Result 466 states and 499 transitions. [2018-11-07 22:14:45,135 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-11-07 22:14:45,135 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 324 [2018-11-07 22:14:45,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:45,137 INFO L225 Difference]: With dead ends: 466 [2018-11-07 22:14:45,137 INFO L226 Difference]: Without dead ends: 329 [2018-11-07 22:14:45,138 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 747 GetRequests, 553 SyntacticMatches, 64 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7039 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=3959, Invalid=13333, Unknown=0, NotChecked=0, Total=17292 [2018-11-07 22:14:45,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2018-11-07 22:14:45,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 329. [2018-11-07 22:14:45,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 329 states. [2018-11-07 22:14:45,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 330 transitions. [2018-11-07 22:14:45,149 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 330 transitions. Word has length 324 [2018-11-07 22:14:45,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:45,150 INFO L480 AbstractCegarLoop]: Abstraction has 329 states and 330 transitions. [2018-11-07 22:14:45,150 INFO L481 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-11-07 22:14:45,150 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 330 transitions. [2018-11-07 22:14:45,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2018-11-07 22:14:45,151 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:45,151 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:45,152 INFO L423 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:45,152 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:45,152 INFO L82 PathProgramCache]: Analyzing trace with hash -259052781, now seen corresponding path program 62 times [2018-11-07 22:14:45,152 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:45,152 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:45,153 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:45,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:45,153 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:45,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:46,055 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1117 proven. 2044 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2018-11-07 22:14:46,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:46,055 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:46,056 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:46,056 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:46,056 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:46,056 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:14:46,066 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:14:46,066 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:14:46,201 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-11-07 22:14:46,201 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:14:46,206 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:46,339 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1118 proven. 1953 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-11-07 22:14:46,339 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:47,249 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1118 proven. 1953 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-11-07 22:14:47,271 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:47,271 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37] total 40 [2018-11-07 22:14:47,271 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:47,272 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-11-07 22:14:47,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-11-07 22:14:47,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=607, Invalid=953, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 22:14:47,272 INFO L87 Difference]: Start difference. First operand 329 states and 330 transitions. Second operand 40 states. [2018-11-07 22:14:47,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:47,682 INFO L93 Difference]: Finished difference Result 339 states and 340 transitions. [2018-11-07 22:14:47,683 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-11-07 22:14:47,683 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 326 [2018-11-07 22:14:47,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:47,685 INFO L225 Difference]: With dead ends: 339 [2018-11-07 22:14:47,685 INFO L226 Difference]: Without dead ends: 337 [2018-11-07 22:14:47,685 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 724 GetRequests, 619 SyntacticMatches, 65 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1284 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=620, Invalid=1102, Unknown=0, NotChecked=0, Total=1722 [2018-11-07 22:14:47,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2018-11-07 22:14:47,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 337. [2018-11-07 22:14:47,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 337 states. [2018-11-07 22:14:47,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 338 transitions. [2018-11-07 22:14:47,699 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 338 transitions. Word has length 326 [2018-11-07 22:14:47,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:47,700 INFO L480 AbstractCegarLoop]: Abstraction has 337 states and 338 transitions. [2018-11-07 22:14:47,700 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-11-07 22:14:47,700 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 338 transitions. [2018-11-07 22:14:47,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2018-11-07 22:14:47,702 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:47,702 INFO L375 BasicCegarLoop]: trace histogram [33, 33, 33, 33, 33, 32, 32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:47,702 INFO L423 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:47,703 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:47,703 INFO L82 PathProgramCache]: Analyzing trace with hash 672210231, now seen corresponding path program 63 times [2018-11-07 22:14:47,703 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:47,704 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:47,704 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:14:47,704 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:47,704 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:47,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:49,572 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-11-07 22:14:49,572 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:49,572 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:49,572 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:49,572 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:49,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:49,573 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:14:49,581 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:14:49,581 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:14:49,679 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:14:49,680 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:14:49,687 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:51,504 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-11-07 22:14:51,504 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:52,913 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-11-07 22:14:52,933 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:52,933 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 102 [2018-11-07 22:14:52,933 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:52,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 102 states [2018-11-07 22:14:52,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2018-11-07 22:14:52,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2379, Invalid=7923, Unknown=0, NotChecked=0, Total=10302 [2018-11-07 22:14:52,935 INFO L87 Difference]: Start difference. First operand 337 states and 338 transitions. Second operand 102 states. [2018-11-07 22:14:55,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:55,437 INFO L93 Difference]: Finished difference Result 480 states and 514 transitions. [2018-11-07 22:14:55,438 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-11-07 22:14:55,438 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 334 [2018-11-07 22:14:55,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:55,439 INFO L225 Difference]: With dead ends: 480 [2018-11-07 22:14:55,440 INFO L226 Difference]: Without dead ends: 339 [2018-11-07 22:14:55,441 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 770 GetRequests, 570 SyntacticMatches, 66 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7490 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=4198, Invalid=14162, Unknown=0, NotChecked=0, Total=18360 [2018-11-07 22:14:55,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2018-11-07 22:14:55,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 339. [2018-11-07 22:14:55,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 339 states. [2018-11-07 22:14:55,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 339 states to 339 states and 340 transitions. [2018-11-07 22:14:55,452 INFO L78 Accepts]: Start accepts. Automaton has 339 states and 340 transitions. Word has length 334 [2018-11-07 22:14:55,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:55,452 INFO L480 AbstractCegarLoop]: Abstraction has 339 states and 340 transitions. [2018-11-07 22:14:55,452 INFO L481 AbstractCegarLoop]: Interpolant automaton has 102 states. [2018-11-07 22:14:55,452 INFO L276 IsEmpty]: Start isEmpty. Operand 339 states and 340 transitions. [2018-11-07 22:14:55,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2018-11-07 22:14:55,454 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:55,454 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 33, 33, 33, 32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:55,454 INFO L423 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:55,454 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:55,454 INFO L82 PathProgramCache]: Analyzing trace with hash 1887049457, now seen corresponding path program 64 times [2018-11-07 22:14:55,454 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:55,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:55,455 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:14:55,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:55,455 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:55,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:56,147 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1185 proven. 2174 refuted. 0 times theorem prover too weak. 1891 trivial. 0 not checked. [2018-11-07 22:14:56,147 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:56,147 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:56,147 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:56,148 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:56,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:56,148 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:14:56,157 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:56,157 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:14:56,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:56,274 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:14:56,400 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1186 proven. 2080 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-11-07 22:14:56,400 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:14:57,353 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1186 proven. 2080 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-11-07 22:14:57,373 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:14:57,373 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 41 [2018-11-07 22:14:57,373 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:14:57,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-11-07 22:14:57,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-11-07 22:14:57,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=642, Invalid=998, Unknown=0, NotChecked=0, Total=1640 [2018-11-07 22:14:57,374 INFO L87 Difference]: Start difference. First operand 339 states and 340 transitions. Second operand 41 states. [2018-11-07 22:14:57,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:14:57,855 INFO L93 Difference]: Finished difference Result 349 states and 350 transitions. [2018-11-07 22:14:57,856 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-11-07 22:14:57,856 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 336 [2018-11-07 22:14:57,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:14:57,858 INFO L225 Difference]: With dead ends: 349 [2018-11-07 22:14:57,858 INFO L226 Difference]: Without dead ends: 347 [2018-11-07 22:14:57,859 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 746 GetRequests, 638 SyntacticMatches, 67 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1357 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=655, Invalid=1151, Unknown=0, NotChecked=0, Total=1806 [2018-11-07 22:14:57,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2018-11-07 22:14:57,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 347. [2018-11-07 22:14:57,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 347 states. [2018-11-07 22:14:57,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 347 states to 347 states and 348 transitions. [2018-11-07 22:14:57,869 INFO L78 Accepts]: Start accepts. Automaton has 347 states and 348 transitions. Word has length 336 [2018-11-07 22:14:57,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:14:57,869 INFO L480 AbstractCegarLoop]: Abstraction has 347 states and 348 transitions. [2018-11-07 22:14:57,870 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-11-07 22:14:57,870 INFO L276 IsEmpty]: Start isEmpty. Operand 347 states and 348 transitions. [2018-11-07 22:14:57,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2018-11-07 22:14:57,871 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:14:57,871 INFO L375 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 34, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:14:57,871 INFO L423 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:14:57,871 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:14:57,872 INFO L82 PathProgramCache]: Analyzing trace with hash -2093397227, now seen corresponding path program 65 times [2018-11-07 22:14:57,872 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:14:57,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:57,872 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:14:57,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:14:57,872 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:14:57,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:14:59,773 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-11-07 22:14:59,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:59,773 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:14:59,773 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:14:59,773 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:14:59,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:14:59,773 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:14:59,781 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:14:59,782 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:14:59,922 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-11-07 22:14:59,922 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:14:59,928 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:01,840 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-11-07 22:15:01,840 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:03,334 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-11-07 22:15:03,355 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:03,355 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 105 [2018-11-07 22:15:03,355 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:03,356 INFO L459 AbstractCegarLoop]: Interpolant automaton has 105 states [2018-11-07 22:15:03,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2018-11-07 22:15:03,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2519, Invalid=8401, Unknown=0, NotChecked=0, Total=10920 [2018-11-07 22:15:03,357 INFO L87 Difference]: Start difference. First operand 347 states and 348 transitions. Second operand 105 states. [2018-11-07 22:15:05,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:05,949 INFO L93 Difference]: Finished difference Result 494 states and 529 transitions. [2018-11-07 22:15:05,950 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-11-07 22:15:05,950 INFO L78 Accepts]: Start accepts. Automaton has 105 states. Word has length 344 [2018-11-07 22:15:05,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:05,951 INFO L225 Difference]: With dead ends: 494 [2018-11-07 22:15:05,951 INFO L226 Difference]: Without dead ends: 349 [2018-11-07 22:15:05,953 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 793 GetRequests, 587 SyntacticMatches, 68 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7955 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=4444, Invalid=15016, Unknown=0, NotChecked=0, Total=19460 [2018-11-07 22:15:05,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2018-11-07 22:15:05,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 349. [2018-11-07 22:15:05,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 349 states. [2018-11-07 22:15:05,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 350 transitions. [2018-11-07 22:15:05,965 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 350 transitions. Word has length 344 [2018-11-07 22:15:05,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:05,966 INFO L480 AbstractCegarLoop]: Abstraction has 349 states and 350 transitions. [2018-11-07 22:15:05,966 INFO L481 AbstractCegarLoop]: Interpolant automaton has 105 states. [2018-11-07 22:15:05,966 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 350 transitions. [2018-11-07 22:15:05,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2018-11-07 22:15:05,967 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:05,967 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 34, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:05,967 INFO L423 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:05,968 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:05,968 INFO L82 PathProgramCache]: Analyzing trace with hash 162063439, now seen corresponding path program 66 times [2018-11-07 22:15:05,968 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:05,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:05,968 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:05,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:05,969 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:05,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:06,616 INFO L134 CoverageAnalysis]: Checked inductivity of 5579 backedges. 1255 proven. 2308 refuted. 0 times theorem prover too weak. 2016 trivial. 0 not checked. [2018-11-07 22:15:06,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:06,616 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:06,616 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:06,616 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:06,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:06,617 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:15:06,625 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:15:06,625 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:15:06,726 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:15:06,726 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:06,732 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:06,899 INFO L134 CoverageAnalysis]: Checked inductivity of 5579 backedges. 1256 proven. 2211 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-11-07 22:15:06,899 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:07,949 INFO L134 CoverageAnalysis]: Checked inductivity of 5579 backedges. 1256 proven. 2211 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-11-07 22:15:07,970 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:07,970 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39] total 42 [2018-11-07 22:15:07,970 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:07,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-11-07 22:15:07,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-11-07 22:15:07,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=678, Invalid=1044, Unknown=0, NotChecked=0, Total=1722 [2018-11-07 22:15:07,971 INFO L87 Difference]: Start difference. First operand 349 states and 350 transitions. Second operand 42 states. [2018-11-07 22:15:08,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:08,389 INFO L93 Difference]: Finished difference Result 359 states and 360 transitions. [2018-11-07 22:15:08,390 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-11-07 22:15:08,390 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 346 [2018-11-07 22:15:08,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:08,392 INFO L225 Difference]: With dead ends: 359 [2018-11-07 22:15:08,392 INFO L226 Difference]: Without dead ends: 357 [2018-11-07 22:15:08,392 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 768 GetRequests, 657 SyntacticMatches, 69 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1432 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=691, Invalid=1201, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 22:15:08,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2018-11-07 22:15:08,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 357. [2018-11-07 22:15:08,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 357 states. [2018-11-07 22:15:08,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 357 states to 357 states and 358 transitions. [2018-11-07 22:15:08,404 INFO L78 Accepts]: Start accepts. Automaton has 357 states and 358 transitions. Word has length 346 [2018-11-07 22:15:08,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:08,404 INFO L480 AbstractCegarLoop]: Abstraction has 357 states and 358 transitions. [2018-11-07 22:15:08,404 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-11-07 22:15:08,404 INFO L276 IsEmpty]: Start isEmpty. Operand 357 states and 358 transitions. [2018-11-07 22:15:08,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 355 [2018-11-07 22:15:08,406 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:08,406 INFO L375 BasicCegarLoop]: trace histogram [35, 35, 35, 35, 35, 34, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:08,407 INFO L423 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:08,407 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:08,407 INFO L82 PathProgramCache]: Analyzing trace with hash 1282136691, now seen corresponding path program 67 times [2018-11-07 22:15:08,407 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:08,408 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:08,408 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:08,408 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:08,408 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:08,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:10,319 INFO L134 CoverageAnalysis]: Checked inductivity of 5848 backedges. 2414 proven. 1190 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-11-07 22:15:10,320 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:10,320 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:10,320 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:10,320 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:10,320 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:10,320 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:15:10,328 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:10,329 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:15:10,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:10,432 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:12,431 INFO L134 CoverageAnalysis]: Checked inductivity of 5848 backedges. 2414 proven. 1190 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-11-07 22:15:12,432 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:14,001 INFO L134 CoverageAnalysis]: Checked inductivity of 5848 backedges. 2414 proven. 1190 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-11-07 22:15:14,021 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:14,021 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 108 [2018-11-07 22:15:14,021 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:14,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 108 states [2018-11-07 22:15:14,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2018-11-07 22:15:14,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2663, Invalid=8893, Unknown=0, NotChecked=0, Total=11556 [2018-11-07 22:15:14,023 INFO L87 Difference]: Start difference. First operand 357 states and 358 transitions. Second operand 108 states. [2018-11-07 22:15:16,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:16,853 INFO L93 Difference]: Finished difference Result 508 states and 544 transitions. [2018-11-07 22:15:16,853 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-11-07 22:15:16,853 INFO L78 Accepts]: Start accepts. Automaton has 108 states. Word has length 354 [2018-11-07 22:15:16,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:16,854 INFO L225 Difference]: With dead ends: 508 [2018-11-07 22:15:16,854 INFO L226 Difference]: Without dead ends: 359 [2018-11-07 22:15:16,856 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 816 GetRequests, 604 SyntacticMatches, 70 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8434 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=4697, Invalid=15895, Unknown=0, NotChecked=0, Total=20592 [2018-11-07 22:15:16,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2018-11-07 22:15:16,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 359. [2018-11-07 22:15:16,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 359 states. [2018-11-07 22:15:16,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 360 transitions. [2018-11-07 22:15:16,869 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 360 transitions. Word has length 354 [2018-11-07 22:15:16,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:16,870 INFO L480 AbstractCegarLoop]: Abstraction has 359 states and 360 transitions. [2018-11-07 22:15:16,870 INFO L481 AbstractCegarLoop]: Interpolant automaton has 108 states. [2018-11-07 22:15:16,870 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 360 transitions. [2018-11-07 22:15:16,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 357 [2018-11-07 22:15:16,872 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:16,872 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 35, 35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:16,872 INFO L423 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:16,872 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:16,873 INFO L82 PathProgramCache]: Analyzing trace with hash 1052816173, now seen corresponding path program 68 times [2018-11-07 22:15:16,873 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:16,873 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:16,873 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:16,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:16,874 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:16,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:17,557 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 1327 proven. 2446 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-11-07 22:15:17,557 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:17,557 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:17,558 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:17,558 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:17,558 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:17,558 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:15:17,566 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:15:17,566 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:15:17,729 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-11-07 22:15:17,729 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:17,735 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:17,865 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 1328 proven. 2346 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-11-07 22:15:17,865 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:18,975 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 1328 proven. 2346 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-11-07 22:15:18,995 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:18,996 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40, 40] total 43 [2018-11-07 22:15:18,996 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:18,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-11-07 22:15:18,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-11-07 22:15:18,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=715, Invalid=1091, Unknown=0, NotChecked=0, Total=1806 [2018-11-07 22:15:18,997 INFO L87 Difference]: Start difference. First operand 359 states and 360 transitions. Second operand 43 states. [2018-11-07 22:15:19,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:19,588 INFO L93 Difference]: Finished difference Result 369 states and 370 transitions. [2018-11-07 22:15:19,588 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-11-07 22:15:19,588 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 356 [2018-11-07 22:15:19,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:19,590 INFO L225 Difference]: With dead ends: 369 [2018-11-07 22:15:19,590 INFO L226 Difference]: Without dead ends: 367 [2018-11-07 22:15:19,590 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 790 GetRequests, 676 SyntacticMatches, 71 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1509 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=728, Invalid=1252, Unknown=0, NotChecked=0, Total=1980 [2018-11-07 22:15:19,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2018-11-07 22:15:19,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 367. [2018-11-07 22:15:19,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 367 states. [2018-11-07 22:15:19,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 368 transitions. [2018-11-07 22:15:19,605 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 368 transitions. Word has length 356 [2018-11-07 22:15:19,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:19,605 INFO L480 AbstractCegarLoop]: Abstraction has 367 states and 368 transitions. [2018-11-07 22:15:19,605 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-11-07 22:15:19,606 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 368 transitions. [2018-11-07 22:15:19,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 365 [2018-11-07 22:15:19,607 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:19,608 INFO L375 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 36, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:19,608 INFO L423 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:19,608 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:19,608 INFO L82 PathProgramCache]: Analyzing trace with hash 523103057, now seen corresponding path program 69 times [2018-11-07 22:15:19,608 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:19,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:19,609 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:19,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:19,609 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:19,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:21,507 INFO L134 CoverageAnalysis]: Checked inductivity of 6195 backedges. 2555 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-11-07 22:15:21,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:21,508 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:21,508 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:21,508 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:21,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:21,508 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:15:21,516 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:15:21,516 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:15:21,636 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:15:21,636 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:21,643 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:23,733 INFO L134 CoverageAnalysis]: Checked inductivity of 6195 backedges. 2555 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-11-07 22:15:23,733 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:25,687 INFO L134 CoverageAnalysis]: Checked inductivity of 6195 backedges. 2555 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-11-07 22:15:25,707 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:25,708 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 111 [2018-11-07 22:15:25,708 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:25,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 111 states [2018-11-07 22:15:25,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2018-11-07 22:15:25,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2811, Invalid=9399, Unknown=0, NotChecked=0, Total=12210 [2018-11-07 22:15:25,710 INFO L87 Difference]: Start difference. First operand 367 states and 368 transitions. Second operand 111 states. [2018-11-07 22:15:28,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:28,430 INFO L93 Difference]: Finished difference Result 522 states and 559 transitions. [2018-11-07 22:15:28,430 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-11-07 22:15:28,430 INFO L78 Accepts]: Start accepts. Automaton has 111 states. Word has length 364 [2018-11-07 22:15:28,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:28,432 INFO L225 Difference]: With dead ends: 522 [2018-11-07 22:15:28,432 INFO L226 Difference]: Without dead ends: 369 [2018-11-07 22:15:28,434 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 839 GetRequests, 621 SyntacticMatches, 72 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8927 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=4957, Invalid=16799, Unknown=0, NotChecked=0, Total=21756 [2018-11-07 22:15:28,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2018-11-07 22:15:28,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 369. [2018-11-07 22:15:28,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 369 states. [2018-11-07 22:15:28,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 369 states to 369 states and 370 transitions. [2018-11-07 22:15:28,452 INFO L78 Accepts]: Start accepts. Automaton has 369 states and 370 transitions. Word has length 364 [2018-11-07 22:15:28,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:28,452 INFO L480 AbstractCegarLoop]: Abstraction has 369 states and 370 transitions. [2018-11-07 22:15:28,452 INFO L481 AbstractCegarLoop]: Interpolant automaton has 111 states. [2018-11-07 22:15:28,452 INFO L276 IsEmpty]: Start isEmpty. Operand 369 states and 370 transitions. [2018-11-07 22:15:28,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 367 [2018-11-07 22:15:28,454 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:28,454 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 36, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:28,455 INFO L423 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:28,455 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:28,455 INFO L82 PathProgramCache]: Analyzing trace with hash 1568580491, now seen corresponding path program 70 times [2018-11-07 22:15:28,455 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:28,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:28,456 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:28,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:28,456 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:28,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:29,288 INFO L134 CoverageAnalysis]: Checked inductivity of 6267 backedges. 1401 proven. 2588 refuted. 0 times theorem prover too weak. 2278 trivial. 0 not checked. [2018-11-07 22:15:29,289 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:29,289 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:29,289 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:29,289 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:29,289 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:29,289 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:15:29,297 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:29,298 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:15:29,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:29,406 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:29,589 INFO L134 CoverageAnalysis]: Checked inductivity of 6267 backedges. 1402 proven. 2485 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-11-07 22:15:29,589 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:31,049 INFO L134 CoverageAnalysis]: Checked inductivity of 6267 backedges. 1402 proven. 2485 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-11-07 22:15:31,069 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:31,069 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 44 [2018-11-07 22:15:31,069 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:31,070 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-11-07 22:15:31,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-11-07 22:15:31,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=753, Invalid=1139, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 22:15:31,070 INFO L87 Difference]: Start difference. First operand 369 states and 370 transitions. Second operand 44 states. [2018-11-07 22:15:31,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:31,584 INFO L93 Difference]: Finished difference Result 379 states and 380 transitions. [2018-11-07 22:15:31,585 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-11-07 22:15:31,585 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 366 [2018-11-07 22:15:31,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:31,587 INFO L225 Difference]: With dead ends: 379 [2018-11-07 22:15:31,587 INFO L226 Difference]: Without dead ends: 377 [2018-11-07 22:15:31,587 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 812 GetRequests, 695 SyntacticMatches, 73 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1588 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=766, Invalid=1304, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 22:15:31,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2018-11-07 22:15:31,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 377. [2018-11-07 22:15:31,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 377 states. [2018-11-07 22:15:31,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 378 transitions. [2018-11-07 22:15:31,600 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 378 transitions. Word has length 366 [2018-11-07 22:15:31,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:31,600 INFO L480 AbstractCegarLoop]: Abstraction has 377 states and 378 transitions. [2018-11-07 22:15:31,600 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-11-07 22:15:31,600 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 378 transitions. [2018-11-07 22:15:31,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2018-11-07 22:15:31,602 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:31,602 INFO L375 BasicCegarLoop]: trace histogram [37, 37, 37, 37, 37, 36, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:31,602 INFO L423 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:31,602 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:31,602 INFO L82 PathProgramCache]: Analyzing trace with hash -904094289, now seen corresponding path program 71 times [2018-11-07 22:15:31,602 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:31,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:31,603 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:31,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:31,603 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:31,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:33,510 INFO L134 CoverageAnalysis]: Checked inductivity of 6552 backedges. 2700 proven. 1332 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-11-07 22:15:33,510 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:33,510 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:33,510 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:33,511 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:33,511 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:33,511 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:15:33,521 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:15:33,521 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:15:33,675 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2018-11-07 22:15:33,675 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:33,681 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:36,112 INFO L134 CoverageAnalysis]: Checked inductivity of 6552 backedges. 2700 proven. 1332 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-11-07 22:15:36,112 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:37,944 INFO L134 CoverageAnalysis]: Checked inductivity of 6552 backedges. 2700 proven. 1332 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-11-07 22:15:37,964 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:37,965 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 114 [2018-11-07 22:15:37,965 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:37,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 114 states [2018-11-07 22:15:37,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2018-11-07 22:15:37,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2963, Invalid=9919, Unknown=0, NotChecked=0, Total=12882 [2018-11-07 22:15:37,966 INFO L87 Difference]: Start difference. First operand 377 states and 378 transitions. Second operand 114 states. [2018-11-07 22:15:40,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:40,926 INFO L93 Difference]: Finished difference Result 536 states and 574 transitions. [2018-11-07 22:15:40,927 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-11-07 22:15:40,927 INFO L78 Accepts]: Start accepts. Automaton has 114 states. Word has length 374 [2018-11-07 22:15:40,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:40,928 INFO L225 Difference]: With dead ends: 536 [2018-11-07 22:15:40,928 INFO L226 Difference]: Without dead ends: 379 [2018-11-07 22:15:40,930 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 862 GetRequests, 638 SyntacticMatches, 74 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9434 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=5224, Invalid=17728, Unknown=0, NotChecked=0, Total=22952 [2018-11-07 22:15:40,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2018-11-07 22:15:40,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 379. [2018-11-07 22:15:40,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 379 states. [2018-11-07 22:15:40,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 380 transitions. [2018-11-07 22:15:40,946 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 380 transitions. Word has length 374 [2018-11-07 22:15:40,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:40,946 INFO L480 AbstractCegarLoop]: Abstraction has 379 states and 380 transitions. [2018-11-07 22:15:40,946 INFO L481 AbstractCegarLoop]: Interpolant automaton has 114 states. [2018-11-07 22:15:40,946 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 380 transitions. [2018-11-07 22:15:40,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 377 [2018-11-07 22:15:40,948 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:40,948 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 37, 37, 37, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:40,948 INFO L423 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:40,948 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:40,949 INFO L82 PathProgramCache]: Analyzing trace with hash -2135435927, now seen corresponding path program 72 times [2018-11-07 22:15:40,949 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:40,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:40,949 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:40,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:40,949 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:40,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:41,714 INFO L134 CoverageAnalysis]: Checked inductivity of 6626 backedges. 1477 proven. 2734 refuted. 0 times theorem prover too weak. 2415 trivial. 0 not checked. [2018-11-07 22:15:41,714 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:41,714 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:41,714 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:41,715 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:41,715 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:41,715 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:15:41,722 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:15:41,722 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:15:41,830 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:15:41,830 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:15:41,836 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:41,998 INFO L134 CoverageAnalysis]: Checked inductivity of 6626 backedges. 1478 proven. 2628 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-11-07 22:15:41,998 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:43,140 INFO L134 CoverageAnalysis]: Checked inductivity of 6626 backedges. 1478 proven. 2628 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-11-07 22:15:43,162 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:43,162 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 45 [2018-11-07 22:15:43,162 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:43,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-11-07 22:15:43,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-11-07 22:15:43,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=792, Invalid=1188, Unknown=0, NotChecked=0, Total=1980 [2018-11-07 22:15:43,163 INFO L87 Difference]: Start difference. First operand 379 states and 380 transitions. Second operand 45 states. [2018-11-07 22:15:43,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:15:43,738 INFO L93 Difference]: Finished difference Result 389 states and 390 transitions. [2018-11-07 22:15:43,738 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-11-07 22:15:43,738 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 376 [2018-11-07 22:15:43,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:15:43,740 INFO L225 Difference]: With dead ends: 389 [2018-11-07 22:15:43,740 INFO L226 Difference]: Without dead ends: 387 [2018-11-07 22:15:43,741 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 834 GetRequests, 714 SyntacticMatches, 75 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1669 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=805, Invalid=1357, Unknown=0, NotChecked=0, Total=2162 [2018-11-07 22:15:43,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2018-11-07 22:15:43,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 387. [2018-11-07 22:15:43,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 387 states. [2018-11-07 22:15:43,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 388 transitions. [2018-11-07 22:15:43,753 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 388 transitions. Word has length 376 [2018-11-07 22:15:43,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:15:43,753 INFO L480 AbstractCegarLoop]: Abstraction has 387 states and 388 transitions. [2018-11-07 22:15:43,753 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-11-07 22:15:43,753 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 388 transitions. [2018-11-07 22:15:43,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 385 [2018-11-07 22:15:43,755 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:15:43,755 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 38, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:15:43,756 INFO L423 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:15:43,756 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:15:43,756 INFO L82 PathProgramCache]: Analyzing trace with hash 1357713805, now seen corresponding path program 73 times [2018-11-07 22:15:43,756 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:15:43,757 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:43,757 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:15:43,757 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:15:43,757 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:15:43,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:45,882 INFO L134 CoverageAnalysis]: Checked inductivity of 6919 backedges. 2849 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-11-07 22:15:45,882 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:45,882 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:15:45,882 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:15:45,883 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:15:45,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:15:45,883 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:15:45,890 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:15:45,891 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:15:45,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:15:45,998 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:15:48,374 INFO L134 CoverageAnalysis]: Checked inductivity of 6919 backedges. 2849 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-11-07 22:15:48,375 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:15:50,367 INFO L134 CoverageAnalysis]: Checked inductivity of 6919 backedges. 2849 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-11-07 22:15:50,387 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:15:50,388 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 117 [2018-11-07 22:15:50,388 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:15:50,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 117 states [2018-11-07 22:15:50,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2018-11-07 22:15:50,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3119, Invalid=10453, Unknown=0, NotChecked=0, Total=13572 [2018-11-07 22:15:50,390 INFO L87 Difference]: Start difference. First operand 387 states and 388 transitions. Second operand 117 states. Received shutdown request... [2018-11-07 22:15:53,117 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-11-07 22:15:53,117 WARN L549 AbstractCegarLoop]: Verification canceled [2018-11-07 22:15:53,123 WARN L205 ceAbstractionStarter]: Timeout [2018-11-07 22:15:53,124 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 10:15:53 BoogieIcfgContainer [2018-11-07 22:15:53,124 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-07 22:15:53,124 INFO L168 Benchmark]: Toolchain (without parser) took 229705.99 ms. Allocated memory was 1.5 GB in the beginning and 2.5 GB in the end (delta: 970.5 MB). Free memory was 1.4 GB in the beginning and 1.7 GB in the end (delta: -256.3 MB). Peak memory consumption was 714.2 MB. Max. memory is 7.1 GB. [2018-11-07 22:15:53,126 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 22:15:53,126 INFO L168 Benchmark]: CACSL2BoogieTranslator took 268.92 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-11-07 22:15:53,126 INFO L168 Benchmark]: Boogie Procedure Inliner took 19.48 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 22:15:53,127 INFO L168 Benchmark]: Boogie Preprocessor took 21.13 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 22:15:53,127 INFO L168 Benchmark]: RCFGBuilder took 402.41 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 710.9 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -752.3 MB). Peak memory consumption was 26.3 MB. Max. memory is 7.1 GB. [2018-11-07 22:15:53,127 INFO L168 Benchmark]: TraceAbstraction took 228989.80 ms. Allocated memory was 2.2 GB in the beginning and 2.5 GB in the end (delta: 259.5 MB). Free memory was 2.1 GB in the beginning and 1.7 GB in the end (delta: 485.5 MB). Peak memory consumption was 745.0 MB. Max. memory is 7.1 GB. [2018-11-07 22:15:53,130 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 268.92 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 19.48 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 21.13 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 402.41 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 710.9 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -752.3 MB). Peak memory consumption was 26.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 228989.80 ms. Allocated memory was 2.2 GB in the beginning and 2.5 GB in the end (delta: 259.5 MB). Free memory was 2.1 GB in the beginning and 1.7 GB in the end (delta: 485.5 MB). Peak memory consumption was 745.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was constructing difference of abstraction (387states) and FLOYD_HOARE automaton (currently 75 states, 117 states before enhancement),while PredicateComparison was comparing new predicate (quantifier-free) to 152 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 22 locations, 1 error locations. TIMEOUT Result, 228.9s OverallTime, 76 OverallIterations, 38 TraceHistogramMax, 68.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 3841 SDtfs, 2935 SDslu, 43606 SDs, 0 SdLazy, 52776 SolverSat, 3570 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 34.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 33604 GetRequests, 26653 SyntacticMatches, 2920 SemanticMatches, 4030 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153462 ImplicationChecksByTransitivity, 158.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=387occurred in iteration=75, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.7s AutomataMinimizationTime, 75 MinimizatonAttempts, 5 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.8s SsaConstructionTime, 5.2s SatisfiabilityAnalysisTime, 148.3s InterpolantComputationTime, 29611 NumberOfCodeBlocks, 29611 NumberOfCodeBlocksAsserted, 629 NumberOfCheckSat, 44173 ConstructedInterpolants, 0 QuantifiedInterpolants, 30896137 SizeOfPredicates, 220 NumberOfNonLiveVariables, 31374 ConjunctsInSsa, 3174 ConjunctsInUnsatCore, 222 InterpolantComputations, 3 PerfectInterpolantSequences, 363149/519143 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown