java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_false-unreach-call3_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 04:05:00,112 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 04:05:00,114 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 04:05:00,126 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 04:05:00,127 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 04:05:00,128 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 04:05:00,129 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 04:05:00,131 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 04:05:00,133 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 04:05:00,133 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 04:05:00,134 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 04:05:00,135 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 04:05:00,136 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 04:05:00,137 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 04:05:00,138 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 04:05:00,139 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 04:05:00,140 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 04:05:00,141 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 04:05:00,143 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 04:05:00,145 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 04:05:00,146 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 04:05:00,148 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 04:05:00,150 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 04:05:00,151 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 04:05:00,151 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 04:05:00,152 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 04:05:00,153 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 04:05:00,154 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 04:05:00,155 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 04:05:00,156 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 04:05:00,156 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 04:05:00,157 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-27 04:05:00,159 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-27 04:05:00,175 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 04:05:00,175 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 04:05:00,176 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 04:05:00,176 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 04:05:00,177 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 04:05:00,177 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 04:05:00,177 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 04:05:00,177 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 04:05:00,177 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 04:05:00,178 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 04:05:00,178 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 04:05:00,178 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-27 04:05:00,179 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 04:05:00,179 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 04:05:00,179 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 04:05:00,179 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 04:05:00,180 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 04:05:00,180 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 04:05:00,180 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 04:05:00,180 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 04:05:00,180 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 04:05:00,181 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 04:05:00,181 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 04:05:00,181 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 04:05:00,181 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 04:05:00,181 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 04:05:00,182 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 04:05:00,182 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 04:05:00,182 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 04:05:00,182 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 04:05:00,183 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 04:05:00,183 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 04:05:00,183 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 04:05:00,183 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 04:05:00,244 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 04:05:00,258 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 04:05:00,263 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 04:05:00,265 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 04:05:00,265 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 04:05:00,266 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/array_false-unreach-call3_true-termination.i [2018-10-27 04:05:00,333 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/05c7193f0/967f396084f146ce9a6be0acf0ab29d8/FLAG6c892ce27 [2018-10-27 04:05:00,803 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 04:05:00,804 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_false-unreach-call3_true-termination.i [2018-10-27 04:05:00,810 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/05c7193f0/967f396084f146ce9a6be0acf0ab29d8/FLAG6c892ce27 [2018-10-27 04:05:00,826 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/05c7193f0/967f396084f146ce9a6be0acf0ab29d8 [2018-10-27 04:05:00,837 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 04:05:00,838 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 04:05:00,839 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 04:05:00,840 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 04:05:00,843 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 04:05:00,844 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 04:05:00" (1/1) ... [2018-10-27 04:05:00,847 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@622b2c7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:00, skipping insertion in model container [2018-10-27 04:05:00,848 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 04:05:00" (1/1) ... [2018-10-27 04:05:00,858 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 04:05:00,878 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 04:05:01,056 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 04:05:01,060 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 04:05:01,083 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 04:05:01,108 INFO L193 MainTranslator]: Completed translation [2018-10-27 04:05:01,109 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:01 WrapperNode [2018-10-27 04:05:01,109 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 04:05:01,109 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 04:05:01,110 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 04:05:01,110 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 04:05:01,116 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:01" (1/1) ... [2018-10-27 04:05:01,124 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:01" (1/1) ... [2018-10-27 04:05:01,142 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 04:05:01,143 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 04:05:01,143 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 04:05:01,143 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 04:05:01,152 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:01" (1/1) ... [2018-10-27 04:05:01,153 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:01" (1/1) ... [2018-10-27 04:05:01,154 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:01" (1/1) ... [2018-10-27 04:05:01,155 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:01" (1/1) ... [2018-10-27 04:05:01,159 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:01" (1/1) ... [2018-10-27 04:05:01,164 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:01" (1/1) ... [2018-10-27 04:05:01,165 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:01" (1/1) ... [2018-10-27 04:05:01,167 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 04:05:01,168 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 04:05:01,168 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 04:05:01,168 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 04:05:01,169 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:01" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 04:05:01,303 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 04:05:01,304 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 04:05:01,304 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 04:05:01,304 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 04:05:01,304 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 04:05:01,304 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 04:05:01,304 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 04:05:01,305 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 04:05:01,654 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 04:05:01,655 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 04:05:01 BoogieIcfgContainer [2018-10-27 04:05:01,655 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 04:05:01,656 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 04:05:01,656 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 04:05:01,659 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 04:05:01,659 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 04:05:00" (1/3) ... [2018-10-27 04:05:01,660 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6115e0b5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 04:05:01, skipping insertion in model container [2018-10-27 04:05:01,660 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:05:01" (2/3) ... [2018-10-27 04:05:01,661 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6115e0b5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 04:05:01, skipping insertion in model container [2018-10-27 04:05:01,661 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 04:05:01" (3/3) ... [2018-10-27 04:05:01,662 INFO L112 eAbstractionObserver]: Analyzing ICFG array_false-unreach-call3_true-termination.i [2018-10-27 04:05:01,671 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 04:05:01,678 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 04:05:01,695 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 04:05:01,729 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 04:05:01,729 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 04:05:01,729 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 04:05:01,729 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 04:05:01,730 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 04:05:01,730 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 04:05:01,730 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 04:05:01,730 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 04:05:01,746 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2018-10-27 04:05:01,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-27 04:05:01,751 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:01,752 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:01,754 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:01,760 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:01,761 INFO L82 PathProgramCache]: Analyzing trace with hash 1097964223, now seen corresponding path program 1 times [2018-10-27 04:05:01,763 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:01,812 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:01,812 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:01,812 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:01,812 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:01,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:01,885 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:01,888 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 04:05:01,888 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 04:05:01,888 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 04:05:01,893 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 04:05:01,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 04:05:01,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 04:05:01,910 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2018-10-27 04:05:01,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:01,932 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2018-10-27 04:05:01,932 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 04:05:01,933 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-10-27 04:05:01,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:01,942 INFO L225 Difference]: With dead ends: 41 [2018-10-27 04:05:01,942 INFO L226 Difference]: Without dead ends: 18 [2018-10-27 04:05:01,946 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 04:05:01,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-27 04:05:01,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-27 04:05:01,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-27 04:05:01,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-10-27 04:05:01,985 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-10-27 04:05:01,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:01,986 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-10-27 04:05:01,986 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 04:05:01,986 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-10-27 04:05:01,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-27 04:05:01,987 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:01,988 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:01,988 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:01,988 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:01,988 INFO L82 PathProgramCache]: Analyzing trace with hash 1413574900, now seen corresponding path program 1 times [2018-10-27 04:05:01,989 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:01,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:01,990 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:01,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:01,991 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:02,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:02,088 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:02,089 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 04:05:02,090 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 04:05:02,090 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 04:05:02,094 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 04:05:02,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 04:05:02,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 04:05:02,095 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 3 states. [2018-10-27 04:05:02,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:02,192 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-27 04:05:02,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 04:05:02,193 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2018-10-27 04:05:02,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:02,196 INFO L225 Difference]: With dead ends: 34 [2018-10-27 04:05:02,197 INFO L226 Difference]: Without dead ends: 25 [2018-10-27 04:05:02,198 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 04:05:02,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-27 04:05:02,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 20. [2018-10-27 04:05:02,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-27 04:05:02,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2018-10-27 04:05:02,204 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2018-10-27 04:05:02,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:02,205 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2018-10-27 04:05:02,205 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 04:05:02,205 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2018-10-27 04:05:02,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-27 04:05:02,206 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:02,206 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:02,207 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:02,207 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:02,207 INFO L82 PathProgramCache]: Analyzing trace with hash -1818930225, now seen corresponding path program 1 times [2018-10-27 04:05:02,207 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:02,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:02,208 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:02,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:02,209 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:02,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:02,278 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:05:02,278 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:02,279 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:02,280 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-10-27 04:05:02,282 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [38], [41], [43], [49], [50], [51], [53] [2018-10-27 04:05:02,343 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-27 04:05:02,343 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 04:05:02,974 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-10-27 04:05:02,976 INFO L272 AbstractInterpreter]: Visited 16 different actions 48 times. Merged at 3 different actions 24 times. Widened at 1 different actions 4 times. Found 1 fixpoints after 1 different actions. Largest state had 30 variables. [2018-10-27 04:05:03,025 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:03,026 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-10-27 04:05:03,185 INFO L227 lantSequenceWeakener]: Weakened 16 states. On average, predicates are now at 84.88% of their original sizes. [2018-10-27 04:05:03,186 INFO L413 sIntCurrentIteration]: Unifying AI predicates [2018-10-27 04:05:03,412 INFO L415 sIntCurrentIteration]: We unified 17 AI predicates to 17 [2018-10-27 04:05:03,413 INFO L424 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-10-27 04:05:03,413 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-10-27 04:05:03,414 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [9] imperfect sequences [4] total 11 [2018-10-27 04:05:03,414 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 04:05:03,414 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 04:05:03,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 04:05:03,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-10-27 04:05:03,415 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 9 states. [2018-10-27 04:05:04,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:04,048 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2018-10-27 04:05:04,049 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 04:05:04,049 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 18 [2018-10-27 04:05:04,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:04,050 INFO L225 Difference]: With dead ends: 41 [2018-10-27 04:05:04,050 INFO L226 Difference]: Without dead ends: 29 [2018-10-27 04:05:04,051 INFO L605 BasicCegarLoop]: 2 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2018-10-27 04:05:04,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-27 04:05:04,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 25. [2018-10-27 04:05:04,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-27 04:05:04,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2018-10-27 04:05:04,059 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 18 [2018-10-27 04:05:04,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:04,060 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2018-10-27 04:05:04,060 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 04:05:04,060 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2018-10-27 04:05:04,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-27 04:05:04,061 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:04,061 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:04,062 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:04,062 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:04,062 INFO L82 PathProgramCache]: Analyzing trace with hash 1343240274, now seen corresponding path program 1 times [2018-10-27 04:05:04,062 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:04,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:04,064 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:04,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:04,064 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:04,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:04,247 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 04:05:04,247 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:04,248 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:04,248 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-10-27 04:05:04,248 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [29], [31], [38], [41], [43], [49], [50], [51], [53] [2018-10-27 04:05:04,256 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-27 04:05:04,256 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 04:05:04,877 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 04:05:04,878 INFO L272 AbstractInterpreter]: Visited 19 different actions 107 times. Merged at 7 different actions 56 times. Widened at 2 different actions 8 times. Found 2 fixpoints after 2 different actions. Largest state had 31 variables. [2018-10-27 04:05:04,919 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:04,921 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 04:05:04,921 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:04,921 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:04,938 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:04,938 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:05:04,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:05,003 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:05,140 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 04:05:05,140 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:05,649 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 04:05:05,689 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:05,689 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-10-27 04:05:05,689 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:05,690 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 04:05:05,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 04:05:05,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-27 04:05:05,691 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 6 states. [2018-10-27 04:05:06,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:06,136 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2018-10-27 04:05:06,138 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 04:05:06,138 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 24 [2018-10-27 04:05:06,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:06,139 INFO L225 Difference]: With dead ends: 49 [2018-10-27 04:05:06,139 INFO L226 Difference]: Without dead ends: 38 [2018-10-27 04:05:06,140 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-27 04:05:06,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-27 04:05:06,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28. [2018-10-27 04:05:06,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-27 04:05:06,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2018-10-27 04:05:06,151 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 24 [2018-10-27 04:05:06,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:06,153 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2018-10-27 04:05:06,153 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 04:05:06,153 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2018-10-27 04:05:06,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-27 04:05:06,154 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:06,155 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:06,155 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:06,155 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:06,156 INFO L82 PathProgramCache]: Analyzing trace with hash 1859017687, now seen corresponding path program 2 times [2018-10-27 04:05:06,156 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:06,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:06,157 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:06,158 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:06,158 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:06,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:06,569 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 04:05:06,571 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:06,571 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:06,571 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:06,572 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:06,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:06,573 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:06,587 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:05:06,588 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:05:06,638 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-27 04:05:06,638 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:06,641 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:06,978 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 04:05:06,978 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:07,459 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 04:05:07,494 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:07,494 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 13 [2018-10-27 04:05:07,495 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:07,495 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 04:05:07,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 04:05:07,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2018-10-27 04:05:07,496 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 9 states. [2018-10-27 04:05:08,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:08,112 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2018-10-27 04:05:08,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 04:05:08,113 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2018-10-27 04:05:08,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:08,114 INFO L225 Difference]: With dead ends: 58 [2018-10-27 04:05:08,114 INFO L226 Difference]: Without dead ends: 42 [2018-10-27 04:05:08,115 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2018-10-27 04:05:08,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-27 04:05:08,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2018-10-27 04:05:08,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-27 04:05:08,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2018-10-27 04:05:08,125 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 27 [2018-10-27 04:05:08,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:08,125 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2018-10-27 04:05:08,125 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 04:05:08,126 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2018-10-27 04:05:08,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-27 04:05:08,144 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:08,144 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:08,144 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:08,144 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:08,145 INFO L82 PathProgramCache]: Analyzing trace with hash 192508852, now seen corresponding path program 3 times [2018-10-27 04:05:08,145 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:08,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:08,149 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:08,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:08,149 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:08,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:08,313 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 04:05:08,314 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:08,314 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:08,314 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:08,314 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:08,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:08,315 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:08,330 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:05:08,331 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:05:08,386 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:05:08,386 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:08,390 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:08,465 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 04:05:08,465 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:08,642 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 04:05:08,672 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:08,672 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-10-27 04:05:08,673 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:08,673 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 04:05:08,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 04:05:08,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-27 04:05:08,674 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 8 states. [2018-10-27 04:05:08,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:08,827 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2018-10-27 04:05:08,828 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 04:05:08,828 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 39 [2018-10-27 04:05:08,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:08,829 INFO L225 Difference]: With dead ends: 69 [2018-10-27 04:05:08,829 INFO L226 Difference]: Without dead ends: 49 [2018-10-27 04:05:08,830 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-27 04:05:08,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-27 04:05:08,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 43. [2018-10-27 04:05:08,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-27 04:05:08,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2018-10-27 04:05:08,840 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 39 [2018-10-27 04:05:08,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:08,841 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2018-10-27 04:05:08,841 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 04:05:08,841 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2018-10-27 04:05:08,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-10-27 04:05:08,842 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:08,842 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:08,843 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:08,843 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:08,843 INFO L82 PathProgramCache]: Analyzing trace with hash -82233969, now seen corresponding path program 4 times [2018-10-27 04:05:08,843 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:08,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:08,844 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:08,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:08,845 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:08,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:09,061 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 04:05:09,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:09,061 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:09,061 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:09,061 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:09,062 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:09,062 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:09,070 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:09,070 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:05:09,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:09,107 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:09,134 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 04:05:09,134 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:09,263 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 04:05:09,286 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:09,286 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-10-27 04:05:09,286 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:09,287 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 04:05:09,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 04:05:09,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-27 04:05:09,288 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 9 states. [2018-10-27 04:05:09,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:09,541 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2018-10-27 04:05:09,542 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 04:05:09,542 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 42 [2018-10-27 04:05:09,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:09,543 INFO L225 Difference]: With dead ends: 76 [2018-10-27 04:05:09,543 INFO L226 Difference]: Without dead ends: 56 [2018-10-27 04:05:09,544 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-27 04:05:09,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-10-27 04:05:09,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 46. [2018-10-27 04:05:09,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-27 04:05:09,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2018-10-27 04:05:09,553 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 42 [2018-10-27 04:05:09,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:09,553 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2018-10-27 04:05:09,554 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 04:05:09,554 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2018-10-27 04:05:09,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-27 04:05:09,555 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:09,555 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:09,555 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:09,555 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:09,556 INFO L82 PathProgramCache]: Analyzing trace with hash 1262051796, now seen corresponding path program 5 times [2018-10-27 04:05:09,556 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:09,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:09,557 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:09,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:09,557 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:09,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:09,737 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 04:05:09,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:09,738 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:09,738 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:09,738 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:09,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:09,739 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:09,746 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:05:09,747 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:05:09,839 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-27 04:05:09,839 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:09,842 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:09,979 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-27 04:05:09,980 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:10,233 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-27 04:05:10,254 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:10,254 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 19 [2018-10-27 04:05:10,254 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:10,255 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 04:05:10,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 04:05:10,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=227, Unknown=0, NotChecked=0, Total=342 [2018-10-27 04:05:10,256 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 12 states. [2018-10-27 04:05:10,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:10,427 INFO L93 Difference]: Finished difference Result 85 states and 90 transitions. [2018-10-27 04:05:10,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 04:05:10,427 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 45 [2018-10-27 04:05:10,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:10,428 INFO L225 Difference]: With dead ends: 85 [2018-10-27 04:05:10,428 INFO L226 Difference]: Without dead ends: 60 [2018-10-27 04:05:10,429 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=121, Invalid=259, Unknown=0, NotChecked=0, Total=380 [2018-10-27 04:05:10,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-27 04:05:10,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2018-10-27 04:05:10,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-27 04:05:10,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2018-10-27 04:05:10,438 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 45 [2018-10-27 04:05:10,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:10,439 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2018-10-27 04:05:10,439 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 04:05:10,439 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2018-10-27 04:05:10,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-27 04:05:10,440 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:10,440 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:10,441 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:10,441 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:10,441 INFO L82 PathProgramCache]: Analyzing trace with hash -65813737, now seen corresponding path program 6 times [2018-10-27 04:05:10,441 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:10,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:10,442 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:10,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:10,442 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:10,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:10,616 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 04:05:10,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:10,616 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:10,617 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:10,617 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:10,617 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:10,617 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:10,624 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:05:10,624 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:05:10,669 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:05:10,669 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:10,672 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:10,689 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 04:05:10,689 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:10,814 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 04:05:10,835 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:10,835 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-10-27 04:05:10,835 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:10,836 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 04:05:10,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 04:05:10,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-27 04:05:10,838 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand 11 states. [2018-10-27 04:05:10,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:10,959 INFO L93 Difference]: Finished difference Result 96 states and 99 transitions. [2018-10-27 04:05:10,959 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 04:05:10,959 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 57 [2018-10-27 04:05:10,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:10,961 INFO L225 Difference]: With dead ends: 96 [2018-10-27 04:05:10,961 INFO L226 Difference]: Without dead ends: 67 [2018-10-27 04:05:10,962 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-27 04:05:10,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-27 04:05:10,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 61. [2018-10-27 04:05:10,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-10-27 04:05:10,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2018-10-27 04:05:10,972 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 57 [2018-10-27 04:05:10,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:10,973 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2018-10-27 04:05:10,973 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 04:05:10,973 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2018-10-27 04:05:10,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-10-27 04:05:10,974 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:10,974 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:10,974 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:10,975 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:10,975 INFO L82 PathProgramCache]: Analyzing trace with hash 1181148210, now seen corresponding path program 7 times [2018-10-27 04:05:10,975 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:10,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:10,976 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:10,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:10,976 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:10,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:11,131 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 04:05:11,131 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:11,131 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:11,132 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:11,132 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:11,132 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:11,132 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:11,141 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:11,141 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:05:11,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:11,202 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:11,228 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 04:05:11,228 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:11,451 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 04:05:11,472 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:11,472 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-10-27 04:05:11,472 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:11,473 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 04:05:11,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 04:05:11,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-27 04:05:11,474 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand 12 states. [2018-10-27 04:05:11,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:11,686 INFO L93 Difference]: Finished difference Result 103 states and 107 transitions. [2018-10-27 04:05:11,686 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 04:05:11,686 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 60 [2018-10-27 04:05:11,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:11,688 INFO L225 Difference]: With dead ends: 103 [2018-10-27 04:05:11,688 INFO L226 Difference]: Without dead ends: 74 [2018-10-27 04:05:11,689 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-27 04:05:11,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-27 04:05:11,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 64. [2018-10-27 04:05:11,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-10-27 04:05:11,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2018-10-27 04:05:11,698 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 60 [2018-10-27 04:05:11,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:11,699 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2018-10-27 04:05:11,699 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 04:05:11,699 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2018-10-27 04:05:11,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-10-27 04:05:11,700 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:11,700 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:11,700 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:11,701 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:11,701 INFO L82 PathProgramCache]: Analyzing trace with hash -2042599113, now seen corresponding path program 8 times [2018-10-27 04:05:11,701 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:11,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:11,702 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:11,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:11,702 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:11,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:11,887 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 04:05:11,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:11,888 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:11,888 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:11,888 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:11,888 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:11,888 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:11,897 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:05:11,897 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:05:11,956 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-27 04:05:11,956 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:11,961 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:12,005 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-27 04:05:12,005 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:12,141 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-27 04:05:12,163 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:12,163 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 25 [2018-10-27 04:05:12,164 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:12,164 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 04:05:12,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 04:05:12,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=380, Unknown=0, NotChecked=0, Total=600 [2018-10-27 04:05:12,165 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand 15 states. [2018-10-27 04:05:12,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:12,431 INFO L93 Difference]: Finished difference Result 112 states and 117 transitions. [2018-10-27 04:05:12,431 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 04:05:12,431 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 63 [2018-10-27 04:05:12,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:12,433 INFO L225 Difference]: With dead ends: 112 [2018-10-27 04:05:12,433 INFO L226 Difference]: Without dead ends: 78 [2018-10-27 04:05:12,435 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=226, Invalid=424, Unknown=0, NotChecked=0, Total=650 [2018-10-27 04:05:12,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-27 04:05:12,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2018-10-27 04:05:12,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-10-27 04:05:12,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2018-10-27 04:05:12,446 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 63 [2018-10-27 04:05:12,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:12,446 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2018-10-27 04:05:12,446 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 04:05:12,447 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2018-10-27 04:05:12,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-10-27 04:05:12,448 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:12,448 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:12,448 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:12,448 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:12,448 INFO L82 PathProgramCache]: Analyzing trace with hash -1037724716, now seen corresponding path program 9 times [2018-10-27 04:05:12,449 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:12,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:12,449 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:12,450 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:12,450 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:12,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:12,663 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 04:05:12,663 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:12,663 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:12,664 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:12,664 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:12,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:12,664 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:12,672 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:05:12,672 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:05:12,738 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:05:12,739 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:12,743 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:12,767 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 04:05:12,768 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:12,949 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 04:05:12,970 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:12,970 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-10-27 04:05:12,970 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:12,970 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 04:05:12,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 04:05:12,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-27 04:05:12,972 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand 14 states. [2018-10-27 04:05:13,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:13,172 INFO L93 Difference]: Finished difference Result 123 states and 126 transitions. [2018-10-27 04:05:13,173 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 04:05:13,173 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 75 [2018-10-27 04:05:13,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:13,174 INFO L225 Difference]: With dead ends: 123 [2018-10-27 04:05:13,174 INFO L226 Difference]: Without dead ends: 85 [2018-10-27 04:05:13,175 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-27 04:05:13,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-27 04:05:13,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 79. [2018-10-27 04:05:13,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-27 04:05:13,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-10-27 04:05:13,199 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 75 [2018-10-27 04:05:13,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:13,200 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-10-27 04:05:13,200 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 04:05:13,200 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-10-27 04:05:13,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-10-27 04:05:13,209 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:13,209 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:13,209 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:13,210 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:13,210 INFO L82 PathProgramCache]: Analyzing trace with hash -448084945, now seen corresponding path program 10 times [2018-10-27 04:05:13,210 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:13,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:13,211 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:13,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:13,211 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:13,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:13,406 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 04:05:13,406 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:13,406 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:13,406 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:13,406 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:13,407 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:13,407 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:13,414 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:13,415 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:05:13,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:13,472 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:13,492 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 04:05:13,492 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:13,807 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 04:05:13,827 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:13,828 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-10-27 04:05:13,828 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:13,828 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 04:05:13,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 04:05:13,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-27 04:05:13,829 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 15 states. [2018-10-27 04:05:14,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:14,023 INFO L93 Difference]: Finished difference Result 130 states and 134 transitions. [2018-10-27 04:05:14,024 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 04:05:14,024 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 78 [2018-10-27 04:05:14,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:14,025 INFO L225 Difference]: With dead ends: 130 [2018-10-27 04:05:14,025 INFO L226 Difference]: Without dead ends: 92 [2018-10-27 04:05:14,026 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-27 04:05:14,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-10-27 04:05:14,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 82. [2018-10-27 04:05:14,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-10-27 04:05:14,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2018-10-27 04:05:14,039 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 78 [2018-10-27 04:05:14,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:14,040 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2018-10-27 04:05:14,040 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 04:05:14,040 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2018-10-27 04:05:14,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-10-27 04:05:14,041 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:14,042 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:14,042 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:14,042 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:14,042 INFO L82 PathProgramCache]: Analyzing trace with hash -905907724, now seen corresponding path program 11 times [2018-10-27 04:05:14,043 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:14,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:14,043 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:14,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:14,044 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:14,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:15,089 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 04:05:15,089 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:15,089 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:15,089 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:15,090 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:15,090 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:15,090 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:15,112 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:05:15,112 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:05:15,211 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-27 04:05:15,211 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:15,214 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:15,259 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-27 04:05:15,259 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:15,686 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-27 04:05:15,708 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:15,708 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 31 [2018-10-27 04:05:15,708 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:15,709 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 04:05:15,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 04:05:15,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=569, Unknown=0, NotChecked=0, Total=930 [2018-10-27 04:05:15,710 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand 18 states. [2018-10-27 04:05:15,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:15,887 INFO L93 Difference]: Finished difference Result 139 states and 144 transitions. [2018-10-27 04:05:15,890 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 04:05:15,890 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 81 [2018-10-27 04:05:15,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:15,891 INFO L225 Difference]: With dead ends: 139 [2018-10-27 04:05:15,891 INFO L226 Difference]: Without dead ends: 96 [2018-10-27 04:05:15,892 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=367, Invalid=625, Unknown=0, NotChecked=0, Total=992 [2018-10-27 04:05:15,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-27 04:05:15,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 94. [2018-10-27 04:05:15,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-10-27 04:05:15,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2018-10-27 04:05:15,906 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 81 [2018-10-27 04:05:15,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:15,906 INFO L481 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2018-10-27 04:05:15,907 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 04:05:15,907 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2018-10-27 04:05:15,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-10-27 04:05:15,908 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:15,908 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:15,908 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:15,909 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:15,909 INFO L82 PathProgramCache]: Analyzing trace with hash 773593207, now seen corresponding path program 12 times [2018-10-27 04:05:15,909 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:15,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:15,910 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:15,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:15,910 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:15,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:16,279 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 04:05:16,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:16,279 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:16,280 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:16,280 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:16,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:16,280 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:16,288 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:05:16,288 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:05:16,358 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:05:16,359 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:16,362 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:16,377 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 04:05:16,377 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:16,873 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 04:05:16,894 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:16,894 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-10-27 04:05:16,894 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:16,895 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 04:05:16,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 04:05:16,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-27 04:05:16,896 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand 17 states. [2018-10-27 04:05:17,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:17,151 INFO L93 Difference]: Finished difference Result 150 states and 153 transitions. [2018-10-27 04:05:17,152 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 04:05:17,152 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 93 [2018-10-27 04:05:17,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:17,154 INFO L225 Difference]: With dead ends: 150 [2018-10-27 04:05:17,154 INFO L226 Difference]: Without dead ends: 103 [2018-10-27 04:05:17,155 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-27 04:05:17,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-27 04:05:17,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 97. [2018-10-27 04:05:17,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-10-27 04:05:17,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-10-27 04:05:17,164 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 93 [2018-10-27 04:05:17,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:17,165 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-10-27 04:05:17,165 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 04:05:17,165 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-10-27 04:05:17,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-27 04:05:17,166 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:17,167 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:17,167 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:17,167 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:17,167 INFO L82 PathProgramCache]: Analyzing trace with hash -1075443694, now seen corresponding path program 13 times [2018-10-27 04:05:17,167 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:17,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:17,168 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:17,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:17,168 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:17,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:17,378 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 04:05:17,379 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:17,379 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:17,379 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:17,379 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:17,379 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:17,379 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:17,388 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:17,388 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:05:17,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:17,463 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:17,512 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 04:05:17,512 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:17,830 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 04:05:17,851 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:17,851 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-10-27 04:05:17,851 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:17,851 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 04:05:17,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 04:05:17,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 04:05:17,852 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 18 states. [2018-10-27 04:05:18,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:18,056 INFO L93 Difference]: Finished difference Result 157 states and 161 transitions. [2018-10-27 04:05:18,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 04:05:18,056 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 96 [2018-10-27 04:05:18,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:18,057 INFO L225 Difference]: With dead ends: 157 [2018-10-27 04:05:18,058 INFO L226 Difference]: Without dead ends: 110 [2018-10-27 04:05:18,059 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 177 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 04:05:18,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2018-10-27 04:05:18,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 100. [2018-10-27 04:05:18,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-10-27 04:05:18,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2018-10-27 04:05:18,069 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 96 [2018-10-27 04:05:18,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:18,069 INFO L481 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2018-10-27 04:05:18,069 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 04:05:18,069 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2018-10-27 04:05:18,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-27 04:05:18,070 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:18,070 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:18,071 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:18,071 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:18,071 INFO L82 PathProgramCache]: Analyzing trace with hash 1516777111, now seen corresponding path program 14 times [2018-10-27 04:05:18,071 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:18,072 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:18,072 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:18,072 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:18,072 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:18,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:18,311 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 04:05:18,311 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:18,311 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:18,311 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:18,312 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:18,312 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:18,312 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:18,319 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:05:18,319 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:05:18,456 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-10-27 04:05:18,456 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:18,460 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:18,508 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-27 04:05:18,508 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:19,040 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-27 04:05:19,061 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:19,061 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 37 [2018-10-27 04:05:19,062 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:19,062 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 04:05:19,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 04:05:19,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=538, Invalid=794, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 04:05:19,063 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand 21 states. [2018-10-27 04:05:19,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:19,360 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2018-10-27 04:05:19,360 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 04:05:19,360 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 99 [2018-10-27 04:05:19,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:19,361 INFO L225 Difference]: With dead ends: 166 [2018-10-27 04:05:19,362 INFO L226 Difference]: Without dead ends: 114 [2018-10-27 04:05:19,363 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=544, Invalid=862, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 04:05:19,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-27 04:05:19,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2018-10-27 04:05:19,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-10-27 04:05:19,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2018-10-27 04:05:19,379 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 99 [2018-10-27 04:05:19,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:19,380 INFO L481 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2018-10-27 04:05:19,380 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 04:05:19,380 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2018-10-27 04:05:19,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-10-27 04:05:19,381 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:19,381 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:19,381 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:19,382 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:19,382 INFO L82 PathProgramCache]: Analyzing trace with hash 280509428, now seen corresponding path program 15 times [2018-10-27 04:05:19,382 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:19,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:19,385 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:19,385 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:19,385 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:19,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:20,199 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 04:05:20,200 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:20,200 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:20,200 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:20,200 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:20,200 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:20,200 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:20,207 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:05:20,207 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:05:20,303 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:05:20,304 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:20,308 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:20,340 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 04:05:20,340 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:21,232 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 04:05:21,254 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:21,254 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-10-27 04:05:21,254 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:21,254 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 04:05:21,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 04:05:21,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 04:05:21,255 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand 20 states. [2018-10-27 04:05:21,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:21,474 INFO L93 Difference]: Finished difference Result 177 states and 180 transitions. [2018-10-27 04:05:21,474 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 04:05:21,474 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 111 [2018-10-27 04:05:21,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:21,476 INFO L225 Difference]: With dead ends: 177 [2018-10-27 04:05:21,476 INFO L226 Difference]: Without dead ends: 121 [2018-10-27 04:05:21,477 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 04:05:21,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-10-27 04:05:21,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 115. [2018-10-27 04:05:21,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-27 04:05:21,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 116 transitions. [2018-10-27 04:05:21,491 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 116 transitions. Word has length 111 [2018-10-27 04:05:21,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:21,491 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 116 transitions. [2018-10-27 04:05:21,491 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 04:05:21,491 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 116 transitions. [2018-10-27 04:05:21,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-10-27 04:05:21,492 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:21,493 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:21,493 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:21,493 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:21,493 INFO L82 PathProgramCache]: Analyzing trace with hash -1179804977, now seen corresponding path program 16 times [2018-10-27 04:05:21,493 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:21,494 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:21,494 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:21,494 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:21,494 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:21,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:21,787 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 04:05:21,787 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:21,787 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:21,788 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:21,788 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:21,788 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:21,788 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:21,796 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:21,796 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:05:21,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:21,879 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:21,910 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 04:05:21,910 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:22,301 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 04:05:22,321 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:22,322 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-10-27 04:05:22,322 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:22,322 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 04:05:22,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 04:05:22,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 04:05:22,323 INFO L87 Difference]: Start difference. First operand 115 states and 116 transitions. Second operand 21 states. [2018-10-27 04:05:22,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:22,572 INFO L93 Difference]: Finished difference Result 184 states and 188 transitions. [2018-10-27 04:05:22,572 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 04:05:22,572 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 114 [2018-10-27 04:05:22,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:22,573 INFO L225 Difference]: With dead ends: 184 [2018-10-27 04:05:22,573 INFO L226 Difference]: Without dead ends: 128 [2018-10-27 04:05:22,574 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 04:05:22,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-10-27 04:05:22,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 118. [2018-10-27 04:05:22,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-10-27 04:05:22,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2018-10-27 04:05:22,585 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 114 [2018-10-27 04:05:22,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:22,585 INFO L481 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2018-10-27 04:05:22,585 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 04:05:22,585 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2018-10-27 04:05:22,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-10-27 04:05:22,586 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:22,587 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:22,587 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:22,587 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:22,587 INFO L82 PathProgramCache]: Analyzing trace with hash -1682503148, now seen corresponding path program 17 times [2018-10-27 04:05:22,587 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:22,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:22,588 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:22,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:22,588 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:22,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:23,435 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 04:05:23,435 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:23,435 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:23,435 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:23,435 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:23,436 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:23,436 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:23,444 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:05:23,445 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:05:23,687 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2018-10-27 04:05:23,687 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:23,691 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:23,747 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-10-27 04:05:23,747 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:24,149 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-10-27 04:05:24,171 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:24,171 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 43 [2018-10-27 04:05:24,171 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:24,172 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 04:05:24,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 04:05:24,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=751, Invalid=1055, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 04:05:24,173 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand 24 states. [2018-10-27 04:05:24,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:24,408 INFO L93 Difference]: Finished difference Result 193 states and 198 transitions. [2018-10-27 04:05:24,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 04:05:24,409 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 117 [2018-10-27 04:05:24,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:24,410 INFO L225 Difference]: With dead ends: 193 [2018-10-27 04:05:24,410 INFO L226 Difference]: Without dead ends: 132 [2018-10-27 04:05:24,412 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=757, Invalid=1135, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 04:05:24,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-10-27 04:05:24,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 130. [2018-10-27 04:05:24,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-10-27 04:05:24,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2018-10-27 04:05:24,427 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 117 [2018-10-27 04:05:24,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:24,427 INFO L481 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2018-10-27 04:05:24,428 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 04:05:24,428 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2018-10-27 04:05:24,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-27 04:05:24,429 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:24,429 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:24,429 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:24,429 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:24,429 INFO L82 PathProgramCache]: Analyzing trace with hash 1944856023, now seen corresponding path program 18 times [2018-10-27 04:05:24,430 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:24,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:24,430 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:24,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:24,430 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:24,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:24,722 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 04:05:24,723 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:24,723 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:24,723 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:24,723 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:24,723 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:24,723 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:24,732 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:05:24,732 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:05:24,817 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:05:24,817 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:24,820 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:24,845 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 04:05:24,846 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:25,595 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 04:05:25,616 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:25,616 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-10-27 04:05:25,616 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:25,617 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 04:05:25,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 04:05:25,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 04:05:25,619 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand 23 states. [2018-10-27 04:05:25,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:25,844 INFO L93 Difference]: Finished difference Result 204 states and 207 transitions. [2018-10-27 04:05:25,844 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 04:05:25,845 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 129 [2018-10-27 04:05:25,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:25,846 INFO L225 Difference]: With dead ends: 204 [2018-10-27 04:05:25,846 INFO L226 Difference]: Without dead ends: 139 [2018-10-27 04:05:25,848 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 238 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 04:05:25,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-27 04:05:25,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 133. [2018-10-27 04:05:25,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-10-27 04:05:25,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 134 transitions. [2018-10-27 04:05:25,861 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 134 transitions. Word has length 129 [2018-10-27 04:05:25,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:25,861 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 134 transitions. [2018-10-27 04:05:25,861 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 04:05:25,861 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 134 transitions. [2018-10-27 04:05:25,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-10-27 04:05:25,862 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:25,862 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:25,862 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:25,862 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:25,862 INFO L82 PathProgramCache]: Analyzing trace with hash 709338098, now seen corresponding path program 19 times [2018-10-27 04:05:25,863 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:25,863 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:25,863 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:25,863 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:25,863 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:25,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:26,598 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 04:05:26,599 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:26,599 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:26,599 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:26,599 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:26,599 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:26,599 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:26,607 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:26,608 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:05:26,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:26,708 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:26,736 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 04:05:26,736 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:27,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 04:05:27,267 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:27,267 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-10-27 04:05:27,267 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:27,268 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 04:05:27,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 04:05:27,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 04:05:27,269 INFO L87 Difference]: Start difference. First operand 133 states and 134 transitions. Second operand 24 states. [2018-10-27 04:05:27,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:27,486 INFO L93 Difference]: Finished difference Result 211 states and 215 transitions. [2018-10-27 04:05:27,489 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 04:05:27,489 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 132 [2018-10-27 04:05:27,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:27,490 INFO L225 Difference]: With dead ends: 211 [2018-10-27 04:05:27,491 INFO L226 Difference]: Without dead ends: 146 [2018-10-27 04:05:27,492 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 04:05:27,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2018-10-27 04:05:27,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 136. [2018-10-27 04:05:27,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-10-27 04:05:27,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2018-10-27 04:05:27,505 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 132 [2018-10-27 04:05:27,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:27,505 INFO L481 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2018-10-27 04:05:27,505 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 04:05:27,505 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2018-10-27 04:05:27,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-10-27 04:05:27,506 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:27,506 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:27,506 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:27,506 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:27,506 INFO L82 PathProgramCache]: Analyzing trace with hash 1264561143, now seen corresponding path program 20 times [2018-10-27 04:05:27,506 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:27,507 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:27,507 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:27,507 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:27,507 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:27,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:28,399 INFO L134 CoverageAnalysis]: Checked inductivity of 1223 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 04:05:28,399 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:28,399 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:28,399 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:28,400 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:28,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:28,400 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:28,407 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:05:28,407 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:05:28,818 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2018-10-27 04:05:28,819 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:28,823 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:28,879 INFO L134 CoverageAnalysis]: Checked inductivity of 1223 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-10-27 04:05:28,879 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:29,500 INFO L134 CoverageAnalysis]: Checked inductivity of 1223 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-10-27 04:05:29,522 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:29,522 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 49 [2018-10-27 04:05:29,523 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:29,523 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 04:05:29,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 04:05:29,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1000, Invalid=1352, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 04:05:29,524 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand 27 states. [2018-10-27 04:05:29,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:29,773 INFO L93 Difference]: Finished difference Result 220 states and 225 transitions. [2018-10-27 04:05:29,774 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 04:05:29,774 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 135 [2018-10-27 04:05:29,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:29,776 INFO L225 Difference]: With dead ends: 220 [2018-10-27 04:05:29,776 INFO L226 Difference]: Without dead ends: 150 [2018-10-27 04:05:29,777 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 246 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1006, Invalid=1444, Unknown=0, NotChecked=0, Total=2450 [2018-10-27 04:05:29,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-10-27 04:05:29,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 148. [2018-10-27 04:05:29,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2018-10-27 04:05:29,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 149 transitions. [2018-10-27 04:05:29,793 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 149 transitions. Word has length 135 [2018-10-27 04:05:29,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:29,794 INFO L481 AbstractCegarLoop]: Abstraction has 148 states and 149 transitions. [2018-10-27 04:05:29,794 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 04:05:29,794 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 149 transitions. [2018-10-27 04:05:29,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-10-27 04:05:29,795 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:29,795 INFO L375 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:29,795 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:29,795 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:29,796 INFO L82 PathProgramCache]: Analyzing trace with hash 1991732244, now seen corresponding path program 21 times [2018-10-27 04:05:29,796 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:29,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:29,797 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:29,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:29,797 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:29,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:30,128 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 04:05:30,128 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:30,128 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:30,128 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:30,129 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:30,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:30,129 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:30,139 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:05:30,139 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:05:30,249 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:05:30,249 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:30,254 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:30,334 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 04:05:30,334 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:31,135 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 04:05:31,156 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:31,156 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-10-27 04:05:31,156 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:31,157 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-27 04:05:31,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-27 04:05:31,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 04:05:31,158 INFO L87 Difference]: Start difference. First operand 148 states and 149 transitions. Second operand 26 states. [2018-10-27 04:05:31,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:31,461 INFO L93 Difference]: Finished difference Result 231 states and 234 transitions. [2018-10-27 04:05:31,461 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 04:05:31,462 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 147 [2018-10-27 04:05:31,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:31,463 INFO L225 Difference]: With dead ends: 231 [2018-10-27 04:05:31,463 INFO L226 Difference]: Without dead ends: 157 [2018-10-27 04:05:31,465 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 271 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 04:05:31,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-27 04:05:31,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 151. [2018-10-27 04:05:31,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-10-27 04:05:31,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 152 transitions. [2018-10-27 04:05:31,484 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 152 transitions. Word has length 147 [2018-10-27 04:05:31,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:31,484 INFO L481 AbstractCegarLoop]: Abstraction has 151 states and 152 transitions. [2018-10-27 04:05:31,484 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-27 04:05:31,484 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 152 transitions. [2018-10-27 04:05:31,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-10-27 04:05:31,485 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:31,485 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:31,485 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:31,486 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:31,486 INFO L82 PathProgramCache]: Analyzing trace with hash -110642833, now seen corresponding path program 22 times [2018-10-27 04:05:31,486 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:31,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:31,487 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:31,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:31,487 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:31,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:31,957 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 04:05:31,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:31,957 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:31,957 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:31,957 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:31,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:31,958 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:31,965 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:31,965 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:05:32,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:32,077 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:32,141 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 04:05:32,141 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:32,788 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 04:05:32,809 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:32,809 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-10-27 04:05:32,809 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:32,810 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 04:05:32,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 04:05:32,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 04:05:32,811 INFO L87 Difference]: Start difference. First operand 151 states and 152 transitions. Second operand 27 states. [2018-10-27 04:05:33,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:33,071 INFO L93 Difference]: Finished difference Result 238 states and 242 transitions. [2018-10-27 04:05:33,071 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 04:05:33,071 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 150 [2018-10-27 04:05:33,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:33,073 INFO L225 Difference]: With dead ends: 238 [2018-10-27 04:05:33,073 INFO L226 Difference]: Without dead ends: 164 [2018-10-27 04:05:33,074 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 276 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 04:05:33,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2018-10-27 04:05:33,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 154. [2018-10-27 04:05:33,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-27 04:05:33,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 155 transitions. [2018-10-27 04:05:33,091 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 155 transitions. Word has length 150 [2018-10-27 04:05:33,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:33,091 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 155 transitions. [2018-10-27 04:05:33,091 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 04:05:33,091 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 155 transitions. [2018-10-27 04:05:33,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-10-27 04:05:33,092 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:33,092 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:33,092 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:33,092 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:33,093 INFO L82 PathProgramCache]: Analyzing trace with hash 1541515828, now seen corresponding path program 23 times [2018-10-27 04:05:33,093 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:33,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:33,094 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:33,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:33,094 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:33,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:33,699 INFO L134 CoverageAnalysis]: Checked inductivity of 1613 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 04:05:33,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:33,700 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:33,700 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:33,700 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:33,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:33,700 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:33,710 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:05:33,710 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:05:34,455 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-10-27 04:05:34,455 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:34,460 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:34,524 INFO L134 CoverageAnalysis]: Checked inductivity of 1613 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-27 04:05:34,524 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:35,225 INFO L134 CoverageAnalysis]: Checked inductivity of 1613 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-27 04:05:35,248 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:35,249 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 55 [2018-10-27 04:05:35,249 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:35,249 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-27 04:05:35,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-27 04:05:35,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1285, Invalid=1685, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 04:05:35,251 INFO L87 Difference]: Start difference. First operand 154 states and 155 transitions. Second operand 30 states. [2018-10-27 04:05:36,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:36,693 INFO L93 Difference]: Finished difference Result 247 states and 252 transitions. [2018-10-27 04:05:36,693 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-27 04:05:36,693 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 153 [2018-10-27 04:05:36,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:36,694 INFO L225 Difference]: With dead ends: 247 [2018-10-27 04:05:36,694 INFO L226 Difference]: Without dead ends: 168 [2018-10-27 04:05:36,696 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1291, Invalid=1789, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 04:05:36,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2018-10-27 04:05:36,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 166. [2018-10-27 04:05:36,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-10-27 04:05:36,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 167 transitions. [2018-10-27 04:05:36,713 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 167 transitions. Word has length 153 [2018-10-27 04:05:36,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:36,713 INFO L481 AbstractCegarLoop]: Abstraction has 166 states and 167 transitions. [2018-10-27 04:05:36,713 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-27 04:05:36,714 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 167 transitions. [2018-10-27 04:05:36,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-10-27 04:05:36,714 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:36,715 INFO L375 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:36,715 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:36,715 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:36,715 INFO L82 PathProgramCache]: Analyzing trace with hash 1394469687, now seen corresponding path program 24 times [2018-10-27 04:05:36,715 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:36,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:36,716 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:36,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:36,716 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:36,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:37,156 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 04:05:37,156 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:37,156 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:37,156 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:37,156 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:37,157 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:37,157 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:37,166 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:05:37,166 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:05:37,282 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:05:37,282 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:37,286 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:37,397 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 04:05:37,397 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:40,179 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 04:05:40,200 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:40,200 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-10-27 04:05:40,200 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:40,201 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-27 04:05:40,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-27 04:05:40,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 04:05:40,202 INFO L87 Difference]: Start difference. First operand 166 states and 167 transitions. Second operand 29 states. [2018-10-27 04:05:40,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:40,457 INFO L93 Difference]: Finished difference Result 258 states and 261 transitions. [2018-10-27 04:05:40,457 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 04:05:40,457 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 165 [2018-10-27 04:05:40,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:40,459 INFO L225 Difference]: With dead ends: 258 [2018-10-27 04:05:40,459 INFO L226 Difference]: Without dead ends: 175 [2018-10-27 04:05:40,461 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 304 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 04:05:40,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-10-27 04:05:40,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 169. [2018-10-27 04:05:40,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-10-27 04:05:40,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2018-10-27 04:05:40,477 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 165 [2018-10-27 04:05:40,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:40,477 INFO L481 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2018-10-27 04:05:40,477 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-27 04:05:40,477 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2018-10-27 04:05:40,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-10-27 04:05:40,478 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:40,478 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:40,478 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:40,478 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:40,478 INFO L82 PathProgramCache]: Analyzing trace with hash -456804398, now seen corresponding path program 25 times [2018-10-27 04:05:40,479 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:40,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:40,479 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:40,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:40,480 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:40,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:41,038 INFO L134 CoverageAnalysis]: Checked inductivity of 1977 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 04:05:41,038 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:41,038 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:41,038 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:41,038 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:41,038 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:41,038 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:41,046 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:41,046 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:05:41,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:41,163 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:41,248 INFO L134 CoverageAnalysis]: Checked inductivity of 1977 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 04:05:41,248 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:42,034 INFO L134 CoverageAnalysis]: Checked inductivity of 1977 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 04:05:42,058 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:42,058 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-10-27 04:05:42,058 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:42,059 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-27 04:05:42,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-27 04:05:42,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 04:05:42,060 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand 30 states. [2018-10-27 04:05:42,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:42,493 INFO L93 Difference]: Finished difference Result 265 states and 269 transitions. [2018-10-27 04:05:42,493 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-27 04:05:42,493 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 168 [2018-10-27 04:05:42,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:42,495 INFO L225 Difference]: With dead ends: 265 [2018-10-27 04:05:42,495 INFO L226 Difference]: Without dead ends: 182 [2018-10-27 04:05:42,496 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 309 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 04:05:42,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-10-27 04:05:42,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 172. [2018-10-27 04:05:42,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-10-27 04:05:42,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 173 transitions. [2018-10-27 04:05:42,515 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 173 transitions. Word has length 168 [2018-10-27 04:05:42,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:42,515 INFO L481 AbstractCegarLoop]: Abstraction has 172 states and 173 transitions. [2018-10-27 04:05:42,515 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-27 04:05:42,515 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 173 transitions. [2018-10-27 04:05:42,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2018-10-27 04:05:42,516 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:42,516 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:42,517 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:42,517 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:42,517 INFO L82 PathProgramCache]: Analyzing trace with hash -88022697, now seen corresponding path program 26 times [2018-10-27 04:05:42,517 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:42,518 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:42,518 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:42,518 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:42,518 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:42,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:43,822 INFO L134 CoverageAnalysis]: Checked inductivity of 2057 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 04:05:43,822 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:43,822 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:43,822 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:43,822 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:43,823 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:43,823 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:43,830 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:05:43,831 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:05:45,045 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2018-10-27 04:05:45,045 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:45,051 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:45,259 INFO L134 CoverageAnalysis]: Checked inductivity of 2057 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-27 04:05:45,259 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:46,684 INFO L134 CoverageAnalysis]: Checked inductivity of 2057 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-27 04:05:46,716 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:46,717 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 61 [2018-10-27 04:05:46,717 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:46,717 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-27 04:05:46,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-27 04:05:46,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1606, Invalid=2054, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 04:05:46,719 INFO L87 Difference]: Start difference. First operand 172 states and 173 transitions. Second operand 33 states. [2018-10-27 04:05:47,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:47,024 INFO L93 Difference]: Finished difference Result 274 states and 279 transitions. [2018-10-27 04:05:47,025 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 04:05:47,025 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 171 [2018-10-27 04:05:47,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:47,026 INFO L225 Difference]: With dead ends: 274 [2018-10-27 04:05:47,026 INFO L226 Difference]: Without dead ends: 186 [2018-10-27 04:05:47,027 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 312 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1612, Invalid=2170, Unknown=0, NotChecked=0, Total=3782 [2018-10-27 04:05:47,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-10-27 04:05:47,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 184. [2018-10-27 04:05:47,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-10-27 04:05:47,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 185 transitions. [2018-10-27 04:05:47,046 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 185 transitions. Word has length 171 [2018-10-27 04:05:47,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:47,047 INFO L481 AbstractCegarLoop]: Abstraction has 184 states and 185 transitions. [2018-10-27 04:05:47,047 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-27 04:05:47,047 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 185 transitions. [2018-10-27 04:05:47,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2018-10-27 04:05:47,048 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:47,048 INFO L375 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:47,048 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:47,048 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:47,049 INFO L82 PathProgramCache]: Analyzing trace with hash 841557044, now seen corresponding path program 27 times [2018-10-27 04:05:47,049 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:47,049 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:47,049 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:47,049 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:47,049 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:47,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:47,728 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 04:05:47,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:47,728 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:47,728 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:47,728 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:47,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:47,729 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:47,739 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:05:47,739 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:05:47,866 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:05:47,866 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:47,871 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:47,940 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 04:05:47,941 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:48,892 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 04:05:48,913 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:48,913 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-10-27 04:05:48,913 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:48,914 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-27 04:05:48,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-27 04:05:48,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 04:05:48,915 INFO L87 Difference]: Start difference. First operand 184 states and 185 transitions. Second operand 32 states. [2018-10-27 04:05:49,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:49,245 INFO L93 Difference]: Finished difference Result 285 states and 288 transitions. [2018-10-27 04:05:49,245 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-27 04:05:49,245 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 183 [2018-10-27 04:05:49,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:49,247 INFO L225 Difference]: With dead ends: 285 [2018-10-27 04:05:49,247 INFO L226 Difference]: Without dead ends: 193 [2018-10-27 04:05:49,248 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 337 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 04:05:49,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-10-27 04:05:49,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 187. [2018-10-27 04:05:49,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-10-27 04:05:49,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 188 transitions. [2018-10-27 04:05:49,274 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 188 transitions. Word has length 183 [2018-10-27 04:05:49,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:49,274 INFO L481 AbstractCegarLoop]: Abstraction has 187 states and 188 transitions. [2018-10-27 04:05:49,274 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-27 04:05:49,274 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 188 transitions. [2018-10-27 04:05:49,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-10-27 04:05:49,275 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:49,275 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:49,276 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:49,276 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:49,276 INFO L82 PathProgramCache]: Analyzing trace with hash -1809899505, now seen corresponding path program 28 times [2018-10-27 04:05:49,276 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:49,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:49,277 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:49,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:49,277 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:49,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:50,470 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 04:05:50,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:50,471 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:50,471 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:50,471 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:50,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:50,471 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:50,485 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:50,485 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:05:50,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:50,624 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:50,660 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 04:05:50,661 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:51,946 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 04:05:51,967 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:51,967 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2018-10-27 04:05:51,968 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:51,968 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-27 04:05:51,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-27 04:05:51,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-27 04:05:51,969 INFO L87 Difference]: Start difference. First operand 187 states and 188 transitions. Second operand 33 states. [2018-10-27 04:05:52,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:52,294 INFO L93 Difference]: Finished difference Result 292 states and 296 transitions. [2018-10-27 04:05:52,294 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 04:05:52,294 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 186 [2018-10-27 04:05:52,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:52,296 INFO L225 Difference]: With dead ends: 292 [2018-10-27 04:05:52,296 INFO L226 Difference]: Without dead ends: 200 [2018-10-27 04:05:52,296 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-27 04:05:52,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2018-10-27 04:05:52,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 190. [2018-10-27 04:05:52,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2018-10-27 04:05:52,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 191 transitions. [2018-10-27 04:05:52,317 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 191 transitions. Word has length 186 [2018-10-27 04:05:52,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:52,317 INFO L481 AbstractCegarLoop]: Abstraction has 190 states and 191 transitions. [2018-10-27 04:05:52,317 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-27 04:05:52,318 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 191 transitions. [2018-10-27 04:05:52,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-10-27 04:05:52,318 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:52,318 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:52,319 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:52,319 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:52,319 INFO L82 PathProgramCache]: Analyzing trace with hash 1686557268, now seen corresponding path program 29 times [2018-10-27 04:05:52,319 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:52,320 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:52,320 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:05:52,320 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:52,320 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:52,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:53,065 INFO L134 CoverageAnalysis]: Checked inductivity of 2555 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 04:05:53,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:53,066 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:53,066 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:53,066 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:53,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:53,066 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:53,073 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:05:53,073 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:05:54,863 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2018-10-27 04:05:54,863 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:54,870 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:55,065 INFO L134 CoverageAnalysis]: Checked inductivity of 2555 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1365 trivial. 0 not checked. [2018-10-27 04:05:55,066 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:56,359 INFO L134 CoverageAnalysis]: Checked inductivity of 2555 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1365 trivial. 0 not checked. [2018-10-27 04:05:56,381 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:56,382 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 67 [2018-10-27 04:05:56,382 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:56,382 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-27 04:05:56,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-27 04:05:56,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1963, Invalid=2459, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 04:05:56,384 INFO L87 Difference]: Start difference. First operand 190 states and 191 transitions. Second operand 36 states. [2018-10-27 04:05:56,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:56,792 INFO L93 Difference]: Finished difference Result 301 states and 306 transitions. [2018-10-27 04:05:56,793 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-27 04:05:56,793 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 189 [2018-10-27 04:05:56,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:56,795 INFO L225 Difference]: With dead ends: 301 [2018-10-27 04:05:56,795 INFO L226 Difference]: Without dead ends: 204 [2018-10-27 04:05:56,796 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 345 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1969, Invalid=2587, Unknown=0, NotChecked=0, Total=4556 [2018-10-27 04:05:56,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2018-10-27 04:05:56,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 202. [2018-10-27 04:05:56,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2018-10-27 04:05:56,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 203 transitions. [2018-10-27 04:05:56,823 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 203 transitions. Word has length 189 [2018-10-27 04:05:56,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:56,823 INFO L481 AbstractCegarLoop]: Abstraction has 202 states and 203 transitions. [2018-10-27 04:05:56,823 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-27 04:05:56,824 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 203 transitions. [2018-10-27 04:05:56,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2018-10-27 04:05:56,825 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:56,825 INFO L375 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:56,825 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:56,825 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:56,825 INFO L82 PathProgramCache]: Analyzing trace with hash 852191383, now seen corresponding path program 30 times [2018-10-27 04:05:56,826 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:56,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:56,826 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:56,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:56,826 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:56,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:05:57,391 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 04:05:57,391 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:57,391 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:05:57,391 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:05:57,391 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:05:57,391 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:05:57,391 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:05:57,398 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:05:57,398 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:05:57,549 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:05:57,549 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:05:57,555 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:05:57,688 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 04:05:57,689 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:05:59,005 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 04:05:59,035 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:05:59,035 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2018-10-27 04:05:59,036 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:05:59,036 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-27 04:05:59,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-27 04:05:59,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 04:05:59,037 INFO L87 Difference]: Start difference. First operand 202 states and 203 transitions. Second operand 35 states. [2018-10-27 04:05:59,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:05:59,459 INFO L93 Difference]: Finished difference Result 312 states and 315 transitions. [2018-10-27 04:05:59,460 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-27 04:05:59,460 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 201 [2018-10-27 04:05:59,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:05:59,461 INFO L225 Difference]: With dead ends: 312 [2018-10-27 04:05:59,461 INFO L226 Difference]: Without dead ends: 211 [2018-10-27 04:05:59,461 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 370 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 04:05:59,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2018-10-27 04:05:59,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 205. [2018-10-27 04:05:59,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-10-27 04:05:59,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 206 transitions. [2018-10-27 04:05:59,493 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 206 transitions. Word has length 201 [2018-10-27 04:05:59,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:05:59,493 INFO L481 AbstractCegarLoop]: Abstraction has 205 states and 206 transitions. [2018-10-27 04:05:59,493 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-27 04:05:59,493 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 206 transitions. [2018-10-27 04:05:59,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-10-27 04:05:59,494 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:05:59,495 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:05:59,495 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:05:59,495 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:05:59,495 INFO L82 PathProgramCache]: Analyzing trace with hash -535149646, now seen corresponding path program 31 times [2018-10-27 04:05:59,495 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:05:59,496 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:59,496 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:05:59,496 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:05:59,496 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:05:59,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:00,083 INFO L134 CoverageAnalysis]: Checked inductivity of 3009 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 04:06:00,084 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:00,084 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:00,084 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:00,084 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:00,084 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:00,085 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:00,092 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:00,092 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:00,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:00,243 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:00,282 INFO L134 CoverageAnalysis]: Checked inductivity of 3009 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 04:06:00,283 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:01,924 INFO L134 CoverageAnalysis]: Checked inductivity of 3009 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 04:06:01,946 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:01,946 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-10-27 04:06:01,946 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:01,947 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-27 04:06:01,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-27 04:06:01,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 04:06:01,948 INFO L87 Difference]: Start difference. First operand 205 states and 206 transitions. Second operand 36 states. [2018-10-27 04:06:02,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:02,415 INFO L93 Difference]: Finished difference Result 319 states and 323 transitions. [2018-10-27 04:06:02,415 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-27 04:06:02,415 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 204 [2018-10-27 04:06:02,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:02,417 INFO L225 Difference]: With dead ends: 319 [2018-10-27 04:06:02,417 INFO L226 Difference]: Without dead ends: 218 [2018-10-27 04:06:02,418 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 442 GetRequests, 375 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 04:06:02,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2018-10-27 04:06:02,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 208. [2018-10-27 04:06:02,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2018-10-27 04:06:02,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 209 transitions. [2018-10-27 04:06:02,440 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 209 transitions. Word has length 204 [2018-10-27 04:06:02,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:02,440 INFO L481 AbstractCegarLoop]: Abstraction has 208 states and 209 transitions. [2018-10-27 04:06:02,441 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-27 04:06:02,441 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 209 transitions. [2018-10-27 04:06:02,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2018-10-27 04:06:02,441 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:02,442 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:02,442 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:02,442 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:02,442 INFO L82 PathProgramCache]: Analyzing trace with hash -341455177, now seen corresponding path program 32 times [2018-10-27 04:06:02,442 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:02,443 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:02,443 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:02,443 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:02,443 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:02,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:03,050 INFO L134 CoverageAnalysis]: Checked inductivity of 3107 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 04:06:03,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:03,050 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:03,050 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:03,051 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:03,051 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:03,051 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:03,057 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:03,058 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:05,952 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-10-27 04:06:05,952 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:05,959 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:06,217 INFO L134 CoverageAnalysis]: Checked inductivity of 3107 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2018-10-27 04:06:06,217 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:07,684 INFO L134 CoverageAnalysis]: Checked inductivity of 3107 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2018-10-27 04:06:07,707 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:07,708 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 73 [2018-10-27 04:06:07,708 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:07,708 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 04:06:07,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 04:06:07,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2356, Invalid=2900, Unknown=0, NotChecked=0, Total=5256 [2018-10-27 04:06:07,709 INFO L87 Difference]: Start difference. First operand 208 states and 209 transitions. Second operand 39 states. [2018-10-27 04:06:08,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:08,085 INFO L93 Difference]: Finished difference Result 328 states and 333 transitions. [2018-10-27 04:06:08,086 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-27 04:06:08,086 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 207 [2018-10-27 04:06:08,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:08,087 INFO L225 Difference]: With dead ends: 328 [2018-10-27 04:06:08,087 INFO L226 Difference]: Without dead ends: 222 [2018-10-27 04:06:08,088 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 378 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 365 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2362, Invalid=3040, Unknown=0, NotChecked=0, Total=5402 [2018-10-27 04:06:08,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-10-27 04:06:08,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 220. [2018-10-27 04:06:08,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2018-10-27 04:06:08,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 221 transitions. [2018-10-27 04:06:08,121 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 221 transitions. Word has length 207 [2018-10-27 04:06:08,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:08,121 INFO L481 AbstractCegarLoop]: Abstraction has 220 states and 221 transitions. [2018-10-27 04:06:08,121 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 04:06:08,121 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 221 transitions. [2018-10-27 04:06:08,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2018-10-27 04:06:08,123 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:08,123 INFO L375 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:08,123 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:08,123 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:08,123 INFO L82 PathProgramCache]: Analyzing trace with hash -1617730476, now seen corresponding path program 33 times [2018-10-27 04:06:08,123 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:08,124 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:08,124 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:08,124 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:08,124 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:08,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:08,959 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 04:06:08,960 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:08,960 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:08,960 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:08,960 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:08,960 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:08,960 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:08,967 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:06:08,967 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:06:09,128 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:06:09,128 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:09,133 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:09,177 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 04:06:09,178 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:10,494 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 04:06:10,515 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:10,515 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-10-27 04:06:10,515 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:10,516 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-27 04:06:10,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-27 04:06:10,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-27 04:06:10,516 INFO L87 Difference]: Start difference. First operand 220 states and 221 transitions. Second operand 38 states. [2018-10-27 04:06:11,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:11,429 INFO L93 Difference]: Finished difference Result 339 states and 342 transitions. [2018-10-27 04:06:11,429 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-27 04:06:11,429 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 219 [2018-10-27 04:06:11,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:11,430 INFO L225 Difference]: With dead ends: 339 [2018-10-27 04:06:11,431 INFO L226 Difference]: Without dead ends: 229 [2018-10-27 04:06:11,431 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 403 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-27 04:06:11,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2018-10-27 04:06:11,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 223. [2018-10-27 04:06:11,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2018-10-27 04:06:11,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 224 transitions. [2018-10-27 04:06:11,465 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 224 transitions. Word has length 219 [2018-10-27 04:06:11,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:11,465 INFO L481 AbstractCegarLoop]: Abstraction has 223 states and 224 transitions. [2018-10-27 04:06:11,465 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-27 04:06:11,465 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 224 transitions. [2018-10-27 04:06:11,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-10-27 04:06:11,466 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:11,467 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:11,467 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:11,467 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:11,467 INFO L82 PathProgramCache]: Analyzing trace with hash 1207553711, now seen corresponding path program 34 times [2018-10-27 04:06:11,467 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:11,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:11,468 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:11,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:11,468 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:11,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:12,309 INFO L134 CoverageAnalysis]: Checked inductivity of 3606 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 04:06:12,309 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:12,309 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:12,309 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:12,309 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:12,309 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:12,310 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:12,317 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:12,317 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:12,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:12,479 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:12,534 INFO L134 CoverageAnalysis]: Checked inductivity of 3606 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 04:06:12,535 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:14,013 INFO L134 CoverageAnalysis]: Checked inductivity of 3606 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 04:06:14,035 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:14,035 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 75 [2018-10-27 04:06:14,035 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:14,035 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 04:06:14,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 04:06:14,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-27 04:06:14,036 INFO L87 Difference]: Start difference. First operand 223 states and 224 transitions. Second operand 39 states. [2018-10-27 04:06:14,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:14,435 INFO L93 Difference]: Finished difference Result 346 states and 350 transitions. [2018-10-27 04:06:14,435 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-27 04:06:14,435 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 222 [2018-10-27 04:06:14,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:14,437 INFO L225 Difference]: With dead ends: 346 [2018-10-27 04:06:14,437 INFO L226 Difference]: Without dead ends: 236 [2018-10-27 04:06:14,438 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 408 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-27 04:06:14,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2018-10-27 04:06:14,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 226. [2018-10-27 04:06:14,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2018-10-27 04:06:14,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 227 transitions. [2018-10-27 04:06:14,473 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 227 transitions. Word has length 222 [2018-10-27 04:06:14,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:14,473 INFO L481 AbstractCegarLoop]: Abstraction has 226 states and 227 transitions. [2018-10-27 04:06:14,473 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 04:06:14,473 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 227 transitions. [2018-10-27 04:06:14,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2018-10-27 04:06:14,474 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:14,475 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:14,475 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:14,475 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:14,475 INFO L82 PathProgramCache]: Analyzing trace with hash 774668916, now seen corresponding path program 35 times [2018-10-27 04:06:14,475 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:14,476 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:14,476 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:14,476 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:14,476 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:14,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:15,198 INFO L134 CoverageAnalysis]: Checked inductivity of 3713 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 04:06:15,198 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:15,199 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:15,199 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:15,199 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:15,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:15,199 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:15,206 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:15,206 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:19,413 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2018-10-27 04:06:19,413 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:19,421 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:19,506 INFO L134 CoverageAnalysis]: Checked inductivity of 3713 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1962 trivial. 0 not checked. [2018-10-27 04:06:19,506 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:21,039 INFO L134 CoverageAnalysis]: Checked inductivity of 3713 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1962 trivial. 0 not checked. [2018-10-27 04:06:21,063 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:21,064 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 79 [2018-10-27 04:06:21,064 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:21,064 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-27 04:06:21,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-27 04:06:21,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2785, Invalid=3377, Unknown=0, NotChecked=0, Total=6162 [2018-10-27 04:06:21,065 INFO L87 Difference]: Start difference. First operand 226 states and 227 transitions. Second operand 42 states. [2018-10-27 04:06:21,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:21,460 INFO L93 Difference]: Finished difference Result 355 states and 360 transitions. [2018-10-27 04:06:21,460 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-27 04:06:21,460 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 225 [2018-10-27 04:06:21,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:21,462 INFO L225 Difference]: With dead ends: 355 [2018-10-27 04:06:21,462 INFO L226 Difference]: Without dead ends: 240 [2018-10-27 04:06:21,463 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 411 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 398 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2791, Invalid=3529, Unknown=0, NotChecked=0, Total=6320 [2018-10-27 04:06:21,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2018-10-27 04:06:21,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 238. [2018-10-27 04:06:21,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2018-10-27 04:06:21,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 239 transitions. [2018-10-27 04:06:21,494 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 239 transitions. Word has length 225 [2018-10-27 04:06:21,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:21,495 INFO L481 AbstractCegarLoop]: Abstraction has 238 states and 239 transitions. [2018-10-27 04:06:21,495 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-27 04:06:21,495 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 239 transitions. [2018-10-27 04:06:21,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2018-10-27 04:06:21,496 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:21,496 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:21,496 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:21,496 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:21,496 INFO L82 PathProgramCache]: Analyzing trace with hash -74539529, now seen corresponding path program 36 times [2018-10-27 04:06:21,496 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:21,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:21,497 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:21,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:21,497 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:21,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:22,463 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 04:06:22,463 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:22,463 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:22,464 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:22,464 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:22,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:22,464 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:22,481 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:06:22,481 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:06:22,653 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:06:22,654 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:22,658 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:22,792 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 04:06:22,793 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:24,649 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 04:06:24,672 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:24,673 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2018-10-27 04:06:24,673 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:24,673 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-27 04:06:24,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-27 04:06:24,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-27 04:06:24,674 INFO L87 Difference]: Start difference. First operand 238 states and 239 transitions. Second operand 41 states. [2018-10-27 04:06:25,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:25,144 INFO L93 Difference]: Finished difference Result 366 states and 369 transitions. [2018-10-27 04:06:25,144 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-27 04:06:25,144 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 237 [2018-10-27 04:06:25,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:25,145 INFO L225 Difference]: With dead ends: 366 [2018-10-27 04:06:25,145 INFO L226 Difference]: Without dead ends: 247 [2018-10-27 04:06:25,146 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 436 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-27 04:06:25,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-10-27 04:06:25,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 241. [2018-10-27 04:06:25,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2018-10-27 04:06:25,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 242 transitions. [2018-10-27 04:06:25,175 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 242 transitions. Word has length 237 [2018-10-27 04:06:25,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:25,175 INFO L481 AbstractCegarLoop]: Abstraction has 241 states and 242 transitions. [2018-10-27 04:06:25,175 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-27 04:06:25,175 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 242 transitions. [2018-10-27 04:06:25,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2018-10-27 04:06:25,176 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:25,177 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:25,177 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:25,177 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:25,177 INFO L82 PathProgramCache]: Analyzing trace with hash 1048528786, now seen corresponding path program 37 times [2018-10-27 04:06:25,177 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:25,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:25,178 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:25,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:25,178 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:25,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:26,156 INFO L134 CoverageAnalysis]: Checked inductivity of 4257 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 04:06:26,157 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:26,157 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:26,157 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:26,157 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:26,157 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:26,157 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:26,164 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:26,165 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:26,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:26,344 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:26,397 INFO L134 CoverageAnalysis]: Checked inductivity of 4257 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 04:06:26,398 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:28,647 INFO L134 CoverageAnalysis]: Checked inductivity of 4257 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 04:06:28,669 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:28,669 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-10-27 04:06:28,669 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:28,670 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-27 04:06:28,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-27 04:06:28,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3240, Invalid=3240, Unknown=0, NotChecked=0, Total=6480 [2018-10-27 04:06:28,671 INFO L87 Difference]: Start difference. First operand 241 states and 242 transitions. Second operand 42 states. [2018-10-27 04:06:29,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:29,144 INFO L93 Difference]: Finished difference Result 373 states and 377 transitions. [2018-10-27 04:06:29,144 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-27 04:06:29,144 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 240 [2018-10-27 04:06:29,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:29,145 INFO L225 Difference]: With dead ends: 373 [2018-10-27 04:06:29,145 INFO L226 Difference]: Without dead ends: 254 [2018-10-27 04:06:29,146 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 520 GetRequests, 441 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3240, Invalid=3240, Unknown=0, NotChecked=0, Total=6480 [2018-10-27 04:06:29,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2018-10-27 04:06:29,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 244. [2018-10-27 04:06:29,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2018-10-27 04:06:29,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 245 transitions. [2018-10-27 04:06:29,178 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 245 transitions. Word has length 240 [2018-10-27 04:06:29,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:29,178 INFO L481 AbstractCegarLoop]: Abstraction has 244 states and 245 transitions. [2018-10-27 04:06:29,178 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-27 04:06:29,178 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 245 transitions. [2018-10-27 04:06:29,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2018-10-27 04:06:29,179 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:29,179 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:29,179 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:29,180 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:29,180 INFO L82 PathProgramCache]: Analyzing trace with hash 581465111, now seen corresponding path program 38 times [2018-10-27 04:06:29,180 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:29,180 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:29,180 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:29,180 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:29,181 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:29,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:29,978 INFO L134 CoverageAnalysis]: Checked inductivity of 4373 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 04:06:29,978 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:29,978 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:29,978 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:29,979 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:29,979 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:29,979 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:29,986 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:29,987 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:36,414 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-10-27 04:06:36,414 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:36,424 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:36,513 INFO L134 CoverageAnalysis]: Checked inductivity of 4373 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2301 trivial. 0 not checked. [2018-10-27 04:06:36,513 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:38,583 INFO L134 CoverageAnalysis]: Checked inductivity of 4373 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2301 trivial. 0 not checked. [2018-10-27 04:06:38,609 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:38,610 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 85 [2018-10-27 04:06:38,610 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:38,610 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-27 04:06:38,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-27 04:06:38,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3250, Invalid=3890, Unknown=0, NotChecked=0, Total=7140 [2018-10-27 04:06:38,612 INFO L87 Difference]: Start difference. First operand 244 states and 245 transitions. Second operand 45 states. [2018-10-27 04:06:39,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:39,104 INFO L93 Difference]: Finished difference Result 382 states and 387 transitions. [2018-10-27 04:06:39,105 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-27 04:06:39,105 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 243 [2018-10-27 04:06:39,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:39,106 INFO L225 Difference]: With dead ends: 382 [2018-10-27 04:06:39,106 INFO L226 Difference]: Without dead ends: 258 [2018-10-27 04:06:39,107 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 444 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=3256, Invalid=4054, Unknown=0, NotChecked=0, Total=7310 [2018-10-27 04:06:39,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2018-10-27 04:06:39,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 256. [2018-10-27 04:06:39,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2018-10-27 04:06:39,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 257 transitions. [2018-10-27 04:06:39,153 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 257 transitions. Word has length 243 [2018-10-27 04:06:39,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:39,153 INFO L481 AbstractCegarLoop]: Abstraction has 256 states and 257 transitions. [2018-10-27 04:06:39,153 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-27 04:06:39,153 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 257 transitions. [2018-10-27 04:06:39,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2018-10-27 04:06:39,155 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:39,155 INFO L375 BasicCegarLoop]: trace histogram [41, 41, 40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:39,155 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:39,155 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:39,156 INFO L82 PathProgramCache]: Analyzing trace with hash -1711526796, now seen corresponding path program 39 times [2018-10-27 04:06:39,156 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:39,156 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:39,156 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:39,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:39,157 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:39,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:40,403 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 04:06:40,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:40,403 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:40,403 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:40,403 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:40,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:40,403 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:40,412 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:06:40,412 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:06:40,598 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:06:40,598 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:40,604 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:40,668 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 04:06:40,668 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:42,805 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 04:06:42,826 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:42,827 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 85 [2018-10-27 04:06:42,827 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:42,827 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-27 04:06:42,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-27 04:06:42,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3570, Invalid=3570, Unknown=0, NotChecked=0, Total=7140 [2018-10-27 04:06:42,828 INFO L87 Difference]: Start difference. First operand 256 states and 257 transitions. Second operand 44 states. [2018-10-27 04:06:43,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:43,311 INFO L93 Difference]: Finished difference Result 393 states and 396 transitions. [2018-10-27 04:06:43,311 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-27 04:06:43,311 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 255 [2018-10-27 04:06:43,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:43,313 INFO L225 Difference]: With dead ends: 393 [2018-10-27 04:06:43,313 INFO L226 Difference]: Without dead ends: 265 [2018-10-27 04:06:43,313 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 552 GetRequests, 469 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=3570, Invalid=3570, Unknown=0, NotChecked=0, Total=7140 [2018-10-27 04:06:43,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2018-10-27 04:06:43,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 259. [2018-10-27 04:06:43,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2018-10-27 04:06:43,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 260 transitions. [2018-10-27 04:06:43,354 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 260 transitions. Word has length 255 [2018-10-27 04:06:43,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:43,355 INFO L481 AbstractCegarLoop]: Abstraction has 259 states and 260 transitions. [2018-10-27 04:06:43,355 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-27 04:06:43,355 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 260 transitions. [2018-10-27 04:06:43,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-10-27 04:06:43,356 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:43,356 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:43,356 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:43,357 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:43,357 INFO L82 PathProgramCache]: Analyzing trace with hash 27116879, now seen corresponding path program 40 times [2018-10-27 04:06:43,357 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:43,357 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:43,358 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:43,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:43,358 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:43,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:44,424 INFO L134 CoverageAnalysis]: Checked inductivity of 4962 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 04:06:44,425 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:44,425 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:44,425 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:44,425 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:44,425 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:44,425 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:44,432 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:44,432 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:44,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:44,622 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:44,700 INFO L134 CoverageAnalysis]: Checked inductivity of 4962 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 04:06:44,700 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:46,652 INFO L134 CoverageAnalysis]: Checked inductivity of 4962 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 04:06:46,674 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:46,674 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2018-10-27 04:06:46,674 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:46,675 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-27 04:06:46,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-27 04:06:46,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3741, Invalid=3741, Unknown=0, NotChecked=0, Total=7482 [2018-10-27 04:06:46,676 INFO L87 Difference]: Start difference. First operand 259 states and 260 transitions. Second operand 45 states. [2018-10-27 04:06:47,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:47,238 INFO L93 Difference]: Finished difference Result 400 states and 404 transitions. [2018-10-27 04:06:47,238 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-27 04:06:47,238 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 258 [2018-10-27 04:06:47,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:47,240 INFO L225 Difference]: With dead ends: 400 [2018-10-27 04:06:47,240 INFO L226 Difference]: Without dead ends: 272 [2018-10-27 04:06:47,241 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 559 GetRequests, 474 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3741, Invalid=3741, Unknown=0, NotChecked=0, Total=7482 [2018-10-27 04:06:47,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2018-10-27 04:06:47,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 262. [2018-10-27 04:06:47,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 262 states. [2018-10-27 04:06:47,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 263 transitions. [2018-10-27 04:06:47,273 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 263 transitions. Word has length 258 [2018-10-27 04:06:47,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:47,274 INFO L481 AbstractCegarLoop]: Abstraction has 262 states and 263 transitions. [2018-10-27 04:06:47,274 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-27 04:06:47,274 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 263 transitions. [2018-10-27 04:06:47,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2018-10-27 04:06:47,275 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:47,276 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:47,276 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:47,276 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:47,276 INFO L82 PathProgramCache]: Analyzing trace with hash -1344750956, now seen corresponding path program 41 times [2018-10-27 04:06:47,276 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:47,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:47,277 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:47,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:47,277 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:47,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:49,096 INFO L134 CoverageAnalysis]: Checked inductivity of 5087 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 04:06:49,096 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:49,097 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:49,097 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:49,097 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:49,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:49,097 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:49,105 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:49,105 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:58,195 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-10-27 04:06:58,196 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:58,205 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:58,316 INFO L134 CoverageAnalysis]: Checked inductivity of 5087 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2667 trivial. 0 not checked. [2018-10-27 04:06:58,316 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:00,266 INFO L134 CoverageAnalysis]: Checked inductivity of 5087 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2667 trivial. 0 not checked. [2018-10-27 04:07:00,291 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:00,292 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 91 [2018-10-27 04:07:00,292 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:00,292 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-27 04:07:00,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-27 04:07:00,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3751, Invalid=4439, Unknown=0, NotChecked=0, Total=8190 [2018-10-27 04:07:00,294 INFO L87 Difference]: Start difference. First operand 262 states and 263 transitions. Second operand 48 states. [2018-10-27 04:07:00,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:00,837 INFO L93 Difference]: Finished difference Result 409 states and 414 transitions. [2018-10-27 04:07:00,838 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-27 04:07:00,838 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 261 [2018-10-27 04:07:00,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:00,840 INFO L225 Difference]: With dead ends: 409 [2018-10-27 04:07:00,840 INFO L226 Difference]: Without dead ends: 276 [2018-10-27 04:07:00,841 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 567 GetRequests, 477 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3757, Invalid=4615, Unknown=0, NotChecked=0, Total=8372 [2018-10-27 04:07:00,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2018-10-27 04:07:00,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 274. [2018-10-27 04:07:00,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2018-10-27 04:07:00,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 275 transitions. [2018-10-27 04:07:00,882 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 275 transitions. Word has length 261 [2018-10-27 04:07:00,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:00,882 INFO L481 AbstractCegarLoop]: Abstraction has 274 states and 275 transitions. [2018-10-27 04:07:00,882 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-27 04:07:00,882 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 275 transitions. [2018-10-27 04:07:00,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2018-10-27 04:07:00,883 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:00,883 INFO L375 BasicCegarLoop]: trace histogram [44, 44, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:00,884 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:00,884 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:00,884 INFO L82 PathProgramCache]: Analyzing trace with hash -1216246953, now seen corresponding path program 42 times [2018-10-27 04:07:00,884 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:00,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:00,885 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:07:00,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:00,885 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:00,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:02,058 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 04:07:02,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:02,058 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:02,058 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:02,059 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:02,059 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:02,059 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:07:02,067 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:07:02,067 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:07:02,265 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:07:02,265 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:07:02,271 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:02,317 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 04:07:02,318 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:04,589 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 04:07:04,610 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:04,610 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 91 [2018-10-27 04:07:04,611 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:04,611 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-27 04:07:04,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-27 04:07:04,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4095, Invalid=4095, Unknown=0, NotChecked=0, Total=8190 [2018-10-27 04:07:04,612 INFO L87 Difference]: Start difference. First operand 274 states and 275 transitions. Second operand 47 states. [2018-10-27 04:07:05,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:05,278 INFO L93 Difference]: Finished difference Result 420 states and 423 transitions. [2018-10-27 04:07:05,279 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-27 04:07:05,279 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 273 [2018-10-27 04:07:05,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:05,280 INFO L225 Difference]: With dead ends: 420 [2018-10-27 04:07:05,280 INFO L226 Difference]: Without dead ends: 283 [2018-10-27 04:07:05,281 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=4095, Invalid=4095, Unknown=0, NotChecked=0, Total=8190 [2018-10-27 04:07:05,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2018-10-27 04:07:05,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 277. [2018-10-27 04:07:05,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 277 states. [2018-10-27 04:07:05,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 278 transitions. [2018-10-27 04:07:05,330 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 278 transitions. Word has length 273 [2018-10-27 04:07:05,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:05,331 INFO L481 AbstractCegarLoop]: Abstraction has 277 states and 278 transitions. [2018-10-27 04:07:05,331 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-27 04:07:05,331 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 278 transitions. [2018-10-27 04:07:05,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2018-10-27 04:07:05,333 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:05,333 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:05,333 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:05,333 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:05,334 INFO L82 PathProgramCache]: Analyzing trace with hash -206650510, now seen corresponding path program 43 times [2018-10-27 04:07:05,334 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:05,334 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:05,334 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:07:05,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:05,335 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:05,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:06,263 INFO L134 CoverageAnalysis]: Checked inductivity of 5721 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 04:07:06,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:06,263 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:06,263 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:06,263 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:06,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:06,264 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:07:06,272 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:07:06,273 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:07:06,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:06,474 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:06,563 INFO L134 CoverageAnalysis]: Checked inductivity of 5721 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 04:07:06,563 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:08,984 INFO L134 CoverageAnalysis]: Checked inductivity of 5721 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 04:07:09,005 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:09,006 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-10-27 04:07:09,006 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:09,006 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-27 04:07:09,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-27 04:07:09,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4278, Invalid=4278, Unknown=0, NotChecked=0, Total=8556 [2018-10-27 04:07:09,007 INFO L87 Difference]: Start difference. First operand 277 states and 278 transitions. Second operand 48 states. [2018-10-27 04:07:09,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:09,598 INFO L93 Difference]: Finished difference Result 427 states and 431 transitions. [2018-10-27 04:07:09,598 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-27 04:07:09,598 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 276 [2018-10-27 04:07:09,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:09,600 INFO L225 Difference]: With dead ends: 427 [2018-10-27 04:07:09,600 INFO L226 Difference]: Without dead ends: 290 [2018-10-27 04:07:09,601 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 598 GetRequests, 507 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=4278, Invalid=4278, Unknown=0, NotChecked=0, Total=8556 [2018-10-27 04:07:09,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2018-10-27 04:07:09,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 280. [2018-10-27 04:07:09,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2018-10-27 04:07:09,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 281 transitions. [2018-10-27 04:07:09,651 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 281 transitions. Word has length 276 [2018-10-27 04:07:09,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:09,651 INFO L481 AbstractCegarLoop]: Abstraction has 280 states and 281 transitions. [2018-10-27 04:07:09,651 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-27 04:07:09,652 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 281 transitions. [2018-10-27 04:07:09,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 280 [2018-10-27 04:07:09,653 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:09,653 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:09,653 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:09,654 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:09,654 INFO L82 PathProgramCache]: Analyzing trace with hash -974990985, now seen corresponding path program 44 times [2018-10-27 04:07:09,654 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:09,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:09,655 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:07:09,655 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:09,655 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:09,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:10,587 INFO L134 CoverageAnalysis]: Checked inductivity of 5855 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 04:07:10,587 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:10,587 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:10,587 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:10,587 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:10,588 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:10,588 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:07:10,594 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:07:10,594 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:07:38,642 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 44 check-sat command(s) [2018-10-27 04:07:38,643 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:07:38,657 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:38,772 INFO L134 CoverageAnalysis]: Checked inductivity of 5855 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 3060 trivial. 0 not checked. [2018-10-27 04:07:38,772 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:41,158 INFO L134 CoverageAnalysis]: Checked inductivity of 5855 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 3060 trivial. 0 not checked. [2018-10-27 04:07:41,184 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:41,185 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 97 [2018-10-27 04:07:41,185 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:41,185 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-27 04:07:41,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-27 04:07:41,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4288, Invalid=5024, Unknown=0, NotChecked=0, Total=9312 [2018-10-27 04:07:41,186 INFO L87 Difference]: Start difference. First operand 280 states and 281 transitions. Second operand 51 states. [2018-10-27 04:07:41,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:41,783 INFO L93 Difference]: Finished difference Result 436 states and 441 transitions. [2018-10-27 04:07:41,783 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-27 04:07:41,784 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 279 [2018-10-27 04:07:41,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:41,785 INFO L225 Difference]: With dead ends: 436 [2018-10-27 04:07:41,785 INFO L226 Difference]: Without dead ends: 294 [2018-10-27 04:07:41,786 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 606 GetRequests, 510 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 497 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=4294, Invalid=5212, Unknown=0, NotChecked=0, Total=9506 [2018-10-27 04:07:41,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2018-10-27 04:07:41,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 292. [2018-10-27 04:07:41,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2018-10-27 04:07:41,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 293 transitions. [2018-10-27 04:07:41,824 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 293 transitions. Word has length 279 [2018-10-27 04:07:41,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:41,824 INFO L481 AbstractCegarLoop]: Abstraction has 292 states and 293 transitions. [2018-10-27 04:07:41,824 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-27 04:07:41,824 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 293 transitions. [2018-10-27 04:07:41,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2018-10-27 04:07:41,825 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:41,826 INFO L375 BasicCegarLoop]: trace histogram [47, 47, 46, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:41,826 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:41,826 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:41,826 INFO L82 PathProgramCache]: Analyzing trace with hash -622232428, now seen corresponding path program 45 times [2018-10-27 04:07:41,826 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:41,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:41,827 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:07:41,827 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:41,827 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:41,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:42,774 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 04:07:42,774 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:42,774 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:42,774 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:42,775 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:42,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:42,775 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:07:42,783 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:07:42,783 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:07:42,994 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:07:42,994 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:07:43,001 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:43,091 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 04:07:43,091 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:45,678 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 04:07:45,701 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:45,701 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2018-10-27 04:07:45,701 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:45,702 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-27 04:07:45,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-27 04:07:45,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4656, Invalid=4656, Unknown=0, NotChecked=0, Total=9312 [2018-10-27 04:07:45,703 INFO L87 Difference]: Start difference. First operand 292 states and 293 transitions. Second operand 50 states. [2018-10-27 04:07:46,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:46,423 INFO L93 Difference]: Finished difference Result 447 states and 450 transitions. [2018-10-27 04:07:46,423 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-27 04:07:46,423 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 291 [2018-10-27 04:07:46,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:46,424 INFO L225 Difference]: With dead ends: 447 [2018-10-27 04:07:46,424 INFO L226 Difference]: Without dead ends: 301 [2018-10-27 04:07:46,425 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 630 GetRequests, 535 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=4656, Invalid=4656, Unknown=0, NotChecked=0, Total=9312 [2018-10-27 04:07:46,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2018-10-27 04:07:46,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 295. [2018-10-27 04:07:46,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 295 states. [2018-10-27 04:07:46,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 296 transitions. [2018-10-27 04:07:46,481 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 296 transitions. Word has length 291 [2018-10-27 04:07:46,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:46,481 INFO L481 AbstractCegarLoop]: Abstraction has 295 states and 296 transitions. [2018-10-27 04:07:46,481 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-27 04:07:46,482 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 296 transitions. [2018-10-27 04:07:46,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2018-10-27 04:07:46,483 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:46,483 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:46,484 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:46,484 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:46,484 INFO L82 PathProgramCache]: Analyzing trace with hash 1009845231, now seen corresponding path program 46 times [2018-10-27 04:07:46,484 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:46,485 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:46,485 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:07:46,485 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:46,485 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:46,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:47,487 INFO L134 CoverageAnalysis]: Checked inductivity of 6534 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 04:07:47,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:47,487 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:47,487 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:47,488 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:47,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:47,488 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 04:07:47,499 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:07:47,499 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:07:47,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:47,719 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:47,811 INFO L134 CoverageAnalysis]: Checked inductivity of 6534 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 04:07:47,811 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:50,582 INFO L134 CoverageAnalysis]: Checked inductivity of 6534 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 04:07:50,615 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:50,615 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 99 [2018-10-27 04:07:50,615 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:50,616 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-27 04:07:50,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-27 04:07:50,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4851, Invalid=4851, Unknown=0, NotChecked=0, Total=9702 [2018-10-27 04:07:50,618 INFO L87 Difference]: Start difference. First operand 295 states and 296 transitions. Second operand 51 states. [2018-10-27 04:07:51,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:51,463 INFO L93 Difference]: Finished difference Result 454 states and 458 transitions. [2018-10-27 04:07:51,467 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-27 04:07:51,467 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 294 [2018-10-27 04:07:51,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:51,468 INFO L225 Difference]: With dead ends: 454 [2018-10-27 04:07:51,468 INFO L226 Difference]: Without dead ends: 308 [2018-10-27 04:07:51,469 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 637 GetRequests, 540 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4851, Invalid=4851, Unknown=0, NotChecked=0, Total=9702 [2018-10-27 04:07:51,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2018-10-27 04:07:51,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 298. [2018-10-27 04:07:51,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 298 states. [2018-10-27 04:07:51,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 299 transitions. [2018-10-27 04:07:51,517 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 299 transitions. Word has length 294 [2018-10-27 04:07:51,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:51,517 INFO L481 AbstractCegarLoop]: Abstraction has 298 states and 299 transitions. [2018-10-27 04:07:51,517 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-27 04:07:51,517 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 299 transitions. [2018-10-27 04:07:51,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2018-10-27 04:07:51,519 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:51,519 INFO L375 BasicCegarLoop]: trace histogram [49, 48, 48, 47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:51,519 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:51,520 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:51,520 INFO L82 PathProgramCache]: Analyzing trace with hash -1089373516, now seen corresponding path program 47 times [2018-10-27 04:07:51,520 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:51,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:51,521 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:07:51,521 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:51,521 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:51,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:52,641 INFO L134 CoverageAnalysis]: Checked inductivity of 6677 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 04:07:52,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:52,642 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:52,642 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:52,642 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:52,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:52,642 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 04:07:52,651 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:07:52,651 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:08:09,293 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2018-10-27 04:08:09,294 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:08:09,308 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:08:09,503 INFO L134 CoverageAnalysis]: Checked inductivity of 6677 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3480 trivial. 0 not checked. [2018-10-27 04:08:09,503 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:08:12,027 INFO L134 CoverageAnalysis]: Checked inductivity of 6677 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3480 trivial. 0 not checked. [2018-10-27 04:08:12,055 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:08:12,055 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 103 [2018-10-27 04:08:12,055 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:08:12,056 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-27 04:08:12,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-27 04:08:12,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4861, Invalid=5645, Unknown=0, NotChecked=0, Total=10506 [2018-10-27 04:08:12,057 INFO L87 Difference]: Start difference. First operand 298 states and 299 transitions. Second operand 54 states. [2018-10-27 04:08:12,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:08:12,731 INFO L93 Difference]: Finished difference Result 463 states and 468 transitions. [2018-10-27 04:08:12,731 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-27 04:08:12,732 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 297 [2018-10-27 04:08:12,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:08:12,734 INFO L225 Difference]: With dead ends: 463 [2018-10-27 04:08:12,734 INFO L226 Difference]: Without dead ends: 312 [2018-10-27 04:08:12,735 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 645 GetRequests, 543 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4867, Invalid=5845, Unknown=0, NotChecked=0, Total=10712 [2018-10-27 04:08:12,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2018-10-27 04:08:12,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 310. [2018-10-27 04:08:12,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 310 states. [2018-10-27 04:08:12,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 311 transitions. [2018-10-27 04:08:12,781 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 311 transitions. Word has length 297 [2018-10-27 04:08:12,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:08:12,781 INFO L481 AbstractCegarLoop]: Abstraction has 310 states and 311 transitions. [2018-10-27 04:08:12,781 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-27 04:08:12,782 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 311 transitions. [2018-10-27 04:08:12,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2018-10-27 04:08:12,783 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:08:12,784 INFO L375 BasicCegarLoop]: trace histogram [50, 50, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:08:12,784 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:08:12,784 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:08:12,784 INFO L82 PathProgramCache]: Analyzing trace with hash 842936503, now seen corresponding path program 48 times [2018-10-27 04:08:12,784 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:08:12,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:12,785 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:08:12,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:12,785 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:08:12,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:08:14,189 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 04:08:14,189 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:14,189 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:08:14,190 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:08:14,190 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:08:14,190 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:14,190 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 04:08:14,197 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:08:14,197 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:08:14,428 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:08:14,428 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:08:14,436 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:08:14,508 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 04:08:14,508 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:08:17,224 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 04:08:17,247 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:08:17,248 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 103 [2018-10-27 04:08:17,248 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:08:17,248 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-27 04:08:17,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-27 04:08:17,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5253, Invalid=5253, Unknown=0, NotChecked=0, Total=10506 [2018-10-27 04:08:17,249 INFO L87 Difference]: Start difference. First operand 310 states and 311 transitions. Second operand 53 states. [2018-10-27 04:08:17,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:08:17,927 INFO L93 Difference]: Finished difference Result 474 states and 477 transitions. [2018-10-27 04:08:17,927 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-27 04:08:17,927 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 309 [2018-10-27 04:08:17,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:08:17,929 INFO L225 Difference]: With dead ends: 474 [2018-10-27 04:08:17,930 INFO L226 Difference]: Without dead ends: 319 [2018-10-27 04:08:17,930 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 669 GetRequests, 568 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=5253, Invalid=5253, Unknown=0, NotChecked=0, Total=10506 [2018-10-27 04:08:17,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2018-10-27 04:08:17,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 313. [2018-10-27 04:08:17,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 313 states. [2018-10-27 04:08:17,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 314 transitions. [2018-10-27 04:08:17,971 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 314 transitions. Word has length 309 [2018-10-27 04:08:17,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:08:17,971 INFO L481 AbstractCegarLoop]: Abstraction has 313 states and 314 transitions. [2018-10-27 04:08:17,971 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-27 04:08:17,971 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 314 transitions. [2018-10-27 04:08:17,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 313 [2018-10-27 04:08:17,973 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:08:17,973 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 50, 50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:08:17,973 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:08:17,973 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:08:17,974 INFO L82 PathProgramCache]: Analyzing trace with hash 1692579666, now seen corresponding path program 49 times [2018-10-27 04:08:17,974 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:08:17,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:17,974 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:08:17,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:17,975 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:08:18,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:08:19,081 INFO L134 CoverageAnalysis]: Checked inductivity of 7401 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 04:08:19,081 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:19,081 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:08:19,082 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:08:19,082 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:08:19,082 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:19,082 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 04:08:19,091 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:08:19,091 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:08:19,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:08:19,312 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:08:19,384 INFO L134 CoverageAnalysis]: Checked inductivity of 7401 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 04:08:19,384 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:08:22,256 INFO L134 CoverageAnalysis]: Checked inductivity of 7401 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 04:08:22,277 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:08:22,277 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 105 [2018-10-27 04:08:22,277 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:08:22,278 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-27 04:08:22,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-27 04:08:22,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5460, Invalid=5460, Unknown=0, NotChecked=0, Total=10920 [2018-10-27 04:08:22,279 INFO L87 Difference]: Start difference. First operand 313 states and 314 transitions. Second operand 54 states. [2018-10-27 04:08:23,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:08:23,008 INFO L93 Difference]: Finished difference Result 481 states and 485 transitions. [2018-10-27 04:08:23,008 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-27 04:08:23,008 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 312 [2018-10-27 04:08:23,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:08:23,009 INFO L225 Difference]: With dead ends: 481 [2018-10-27 04:08:23,009 INFO L226 Difference]: Without dead ends: 326 [2018-10-27 04:08:23,010 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 676 GetRequests, 573 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=5460, Invalid=5460, Unknown=0, NotChecked=0, Total=10920 [2018-10-27 04:08:23,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2018-10-27 04:08:23,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 316. [2018-10-27 04:08:23,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2018-10-27 04:08:23,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 317 transitions. [2018-10-27 04:08:23,061 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 317 transitions. Word has length 312 [2018-10-27 04:08:23,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:08:23,061 INFO L481 AbstractCegarLoop]: Abstraction has 316 states and 317 transitions. [2018-10-27 04:08:23,061 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-27 04:08:23,061 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 317 transitions. [2018-10-27 04:08:23,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 316 [2018-10-27 04:08:23,063 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:08:23,063 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 51, 50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:08:23,063 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:08:23,063 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:08:23,063 INFO L82 PathProgramCache]: Analyzing trace with hash -1125194025, now seen corresponding path program 50 times [2018-10-27 04:08:23,064 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:08:23,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:23,064 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:08:23,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:23,064 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:08:23,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:08:24,176 INFO L134 CoverageAnalysis]: Checked inductivity of 7553 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 04:08:24,176 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:24,176 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:08:24,176 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:08:24,176 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:08:24,176 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:24,177 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 04:08:24,186 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:08:24,187 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:08:43,394 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2018-10-27 04:08:43,394 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:08:43,411 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:08:43,537 INFO L134 CoverageAnalysis]: Checked inductivity of 7553 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3927 trivial. 0 not checked. [2018-10-27 04:08:43,537 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:08:46,683 INFO L134 CoverageAnalysis]: Checked inductivity of 7553 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3927 trivial. 0 not checked. [2018-10-27 04:08:46,712 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:08:46,712 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 109 [2018-10-27 04:08:46,712 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:08:46,713 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-27 04:08:46,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-27 04:08:46,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5470, Invalid=6302, Unknown=0, NotChecked=0, Total=11772 [2018-10-27 04:08:46,714 INFO L87 Difference]: Start difference. First operand 316 states and 317 transitions. Second operand 57 states. [2018-10-27 04:08:47,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:08:47,407 INFO L93 Difference]: Finished difference Result 490 states and 495 transitions. [2018-10-27 04:08:47,407 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-27 04:08:47,407 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 315 [2018-10-27 04:08:47,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:08:47,409 INFO L225 Difference]: With dead ends: 490 [2018-10-27 04:08:47,409 INFO L226 Difference]: Without dead ends: 330 [2018-10-27 04:08:47,411 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 684 GetRequests, 576 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 563 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=5476, Invalid=6514, Unknown=0, NotChecked=0, Total=11990 [2018-10-27 04:08:47,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2018-10-27 04:08:47,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 328. [2018-10-27 04:08:47,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 328 states. [2018-10-27 04:08:47,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 329 transitions. [2018-10-27 04:08:47,485 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 329 transitions. Word has length 315 [2018-10-27 04:08:47,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:08:47,485 INFO L481 AbstractCegarLoop]: Abstraction has 328 states and 329 transitions. [2018-10-27 04:08:47,485 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-27 04:08:47,485 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 329 transitions. [2018-10-27 04:08:47,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2018-10-27 04:08:47,487 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:08:47,487 INFO L375 BasicCegarLoop]: trace histogram [53, 53, 52, 52, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:08:47,487 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:08:47,488 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:08:47,488 INFO L82 PathProgramCache]: Analyzing trace with hash 1516328116, now seen corresponding path program 51 times [2018-10-27 04:08:47,488 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:08:47,488 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:47,489 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:08:47,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:47,489 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:08:47,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:08:48,703 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-27 04:08:48,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:48,703 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:08:48,703 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:08:48,704 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:08:48,704 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:48,704 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 04:08:48,711 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:08:48,711 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:08:48,954 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:08:48,954 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:08:48,961 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:08:49,027 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-27 04:08:49,028 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:08:52,177 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-27 04:08:52,199 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:08:52,200 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 109 [2018-10-27 04:08:52,200 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:08:52,200 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-10-27 04:08:52,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-10-27 04:08:52,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5886, Invalid=5886, Unknown=0, NotChecked=0, Total=11772 [2018-10-27 04:08:52,201 INFO L87 Difference]: Start difference. First operand 328 states and 329 transitions. Second operand 56 states. [2018-10-27 04:08:53,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:08:53,051 INFO L93 Difference]: Finished difference Result 501 states and 504 transitions. [2018-10-27 04:08:53,051 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-27 04:08:53,051 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 327 [2018-10-27 04:08:53,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:08:53,052 INFO L225 Difference]: With dead ends: 501 [2018-10-27 04:08:53,052 INFO L226 Difference]: Without dead ends: 337 [2018-10-27 04:08:53,053 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 708 GetRequests, 601 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=5886, Invalid=5886, Unknown=0, NotChecked=0, Total=11772 [2018-10-27 04:08:53,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2018-10-27 04:08:53,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 331. [2018-10-27 04:08:53,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 331 states. [2018-10-27 04:08:53,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 332 transitions. [2018-10-27 04:08:53,109 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 332 transitions. Word has length 327 [2018-10-27 04:08:53,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:08:53,109 INFO L481 AbstractCegarLoop]: Abstraction has 331 states and 332 transitions. [2018-10-27 04:08:53,109 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-10-27 04:08:53,109 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 332 transitions. [2018-10-27 04:08:53,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2018-10-27 04:08:53,110 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:08:53,111 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 53, 53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:08:53,111 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:08:53,111 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:08:53,111 INFO L82 PathProgramCache]: Analyzing trace with hash 1633258127, now seen corresponding path program 52 times [2018-10-27 04:08:53,111 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:08:53,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:53,112 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:08:53,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:53,112 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:08:53,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:08:54,418 INFO L134 CoverageAnalysis]: Checked inductivity of 8322 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-27 04:08:54,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:54,418 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:08:54,418 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:08:54,418 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:08:54,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:54,418 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 04:08:54,425 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:08:54,426 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:08:54,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:08:54,672 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:08:54,748 INFO L134 CoverageAnalysis]: Checked inductivity of 8322 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-27 04:08:54,748 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:08:57,898 INFO L134 CoverageAnalysis]: Checked inductivity of 8322 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-27 04:08:57,920 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:08:57,920 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 111 [2018-10-27 04:08:57,920 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:08:57,920 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-27 04:08:57,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-27 04:08:57,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6105, Invalid=6105, Unknown=0, NotChecked=0, Total=12210 [2018-10-27 04:08:57,921 INFO L87 Difference]: Start difference. First operand 331 states and 332 transitions. Second operand 57 states. [2018-10-27 04:08:58,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:08:58,941 INFO L93 Difference]: Finished difference Result 508 states and 512 transitions. [2018-10-27 04:08:58,941 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-27 04:08:58,942 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 330 [2018-10-27 04:08:58,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:08:58,943 INFO L225 Difference]: With dead ends: 508 [2018-10-27 04:08:58,943 INFO L226 Difference]: Without dead ends: 344 [2018-10-27 04:08:58,944 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 715 GetRequests, 606 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=6105, Invalid=6105, Unknown=0, NotChecked=0, Total=12210 [2018-10-27 04:08:58,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2018-10-27 04:08:59,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 334. [2018-10-27 04:08:59,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 334 states. [2018-10-27 04:08:59,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 335 transitions. [2018-10-27 04:08:59,012 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 335 transitions. Word has length 330 [2018-10-27 04:08:59,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:08:59,012 INFO L481 AbstractCegarLoop]: Abstraction has 334 states and 335 transitions. [2018-10-27 04:08:59,012 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-27 04:08:59,012 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 335 transitions. [2018-10-27 04:08:59,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2018-10-27 04:08:59,014 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:08:59,014 INFO L375 BasicCegarLoop]: trace histogram [55, 54, 54, 53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:08:59,014 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:08:59,014 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:08:59,015 INFO L82 PathProgramCache]: Analyzing trace with hash 1876738772, now seen corresponding path program 53 times [2018-10-27 04:08:59,015 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:08:59,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:59,015 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:08:59,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:59,016 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:08:59,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:09:00,486 INFO L134 CoverageAnalysis]: Checked inductivity of 8483 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-27 04:09:00,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:09:00,487 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:09:00,487 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:09:00,487 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:09:00,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:09:00,487 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 04:09:00,495 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:09:00,495 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown