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-d380424 [2018-10-24 12:09:19,202 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:09:19,204 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:09:19,221 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:09:19,222 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:09:19,223 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:09:19,225 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:09:19,227 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:09:19,230 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:09:19,231 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:09:19,233 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:09:19,233 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:09:19,234 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:09:19,236 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:09:19,237 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:09:19,238 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:09:19,247 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:09:19,251 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:09:19,252 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:09:19,254 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:09:19,255 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:09:19,256 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:09:19,258 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:09:19,258 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:09:19,258 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:09:19,259 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:09:19,260 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:09:19,260 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:09:19,261 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:09:19,262 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:09:19,262 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:09:19,263 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-24 12:09:19,265 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 [2018-10-24 12:09:19,279 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:09:19,280 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:09:19,280 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:09:19,281 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:09:19,281 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:09:19,281 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:09:19,281 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:09:19,281 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:09:19,281 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:09:19,282 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:09:19,282 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:09:19,282 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:09:19,283 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:09:19,283 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:09:19,283 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:09:19,283 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:09:19,283 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:09:19,283 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:09:19,284 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:09:19,284 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:09:19,284 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:09:19,284 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:09:19,284 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:09:19,285 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:09:19,285 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:09:19,285 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:09:19,285 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:09:19,285 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:09:19,286 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:09:19,286 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:09:19,286 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:09:19,286 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:09:19,286 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:09:19,286 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:09:19,328 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:09:19,342 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:09:19,345 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:09:19,347 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:09:19,347 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:09:19,348 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/array_false-unreach-call3_true-termination.i [2018-10-24 12:09:19,404 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2fed93159/20d4a83473554699a48b180f6c7b196e/FLAGe8732f16f [2018-10-24 12:09:19,858 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:09:19,859 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_false-unreach-call3_true-termination.i [2018-10-24 12:09:19,865 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2fed93159/20d4a83473554699a48b180f6c7b196e/FLAGe8732f16f [2018-10-24 12:09:19,881 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2fed93159/20d4a83473554699a48b180f6c7b196e [2018-10-24 12:09:19,894 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:09:19,896 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:09:19,897 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:09:19,897 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:09:19,901 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:09:19,902 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:09:19" (1/1) ... [2018-10-24 12:09:19,904 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6c671f0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:19, skipping insertion in model container [2018-10-24 12:09:19,905 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:09:19" (1/1) ... [2018-10-24 12:09:19,915 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:09:19,936 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:09:20,101 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:09:20,105 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:09:20,124 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:09:20,145 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:09:20,146 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:20 WrapperNode [2018-10-24 12:09:20,146 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:09:20,147 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:09:20,147 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:09:20,147 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:09:20,157 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:20" (1/1) ... [2018-10-24 12:09:20,166 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:20" (1/1) ... [2018-10-24 12:09:20,187 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:09:20,188 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:09:20,188 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:09:20,188 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:09:20,198 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:20" (1/1) ... [2018-10-24 12:09:20,199 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:20" (1/1) ... [2018-10-24 12:09:20,200 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:20" (1/1) ... [2018-10-24 12:09:20,200 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:20" (1/1) ... [2018-10-24 12:09:20,205 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:20" (1/1) ... [2018-10-24 12:09:20,212 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:20" (1/1) ... [2018-10-24 12:09:20,213 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:20" (1/1) ... [2018-10-24 12:09:20,215 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:09:20,216 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:09:20,216 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:09:20,216 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:09:20,217 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:20" (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 [2018-10-24 12:09:20,338 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:09:20,338 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:09:20,338 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:09:20,339 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:09:20,339 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:09:20,339 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:09:20,339 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:09:20,339 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:09:20,705 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:09:20,706 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:09:20 BoogieIcfgContainer [2018-10-24 12:09:20,706 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:09:20,707 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:09:20,707 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:09:20,710 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:09:20,711 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:09:19" (1/3) ... [2018-10-24 12:09:20,711 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43fe2a00 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:09:20, skipping insertion in model container [2018-10-24 12:09:20,712 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:20" (2/3) ... [2018-10-24 12:09:20,712 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43fe2a00 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:09:20, skipping insertion in model container [2018-10-24 12:09:20,712 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:09:20" (3/3) ... [2018-10-24 12:09:20,714 INFO L112 eAbstractionObserver]: Analyzing ICFG array_false-unreach-call3_true-termination.i [2018-10-24 12:09:20,722 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:09:20,730 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:09:20,747 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:09:20,780 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:09:20,781 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:09:20,781 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:09:20,781 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:09:20,781 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:09:20,781 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:09:20,781 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:09:20,781 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:09:20,797 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2018-10-24 12:09:20,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 12:09:20,803 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:20,804 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:20,806 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:20,812 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:20,812 INFO L82 PathProgramCache]: Analyzing trace with hash 1097964223, now seen corresponding path program 1 times [2018-10-24 12:09:20,815 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:20,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:20,861 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:20,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:20,861 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:20,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:20,938 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:20,940 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:09:20,941 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:09:20,941 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:09:20,945 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:09:20,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:09:20,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:09:20,961 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2018-10-24 12:09:20,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:20,983 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2018-10-24 12:09:20,983 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:09:20,984 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-10-24 12:09:20,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:20,992 INFO L225 Difference]: With dead ends: 41 [2018-10-24 12:09:20,992 INFO L226 Difference]: Without dead ends: 18 [2018-10-24 12:09:20,996 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 [2018-10-24 12:09:21,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-24 12:09:21,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-24 12:09:21,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 12:09:21,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-10-24 12:09:21,035 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-10-24 12:09:21,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:21,036 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-10-24 12:09:21,036 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:09:21,036 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-10-24 12:09:21,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-24 12:09:21,037 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:21,037 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:21,038 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:21,038 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:21,038 INFO L82 PathProgramCache]: Analyzing trace with hash 1413574900, now seen corresponding path program 1 times [2018-10-24 12:09:21,038 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:21,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:21,040 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:21,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:21,040 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:21,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:21,150 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:21,150 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:09:21,151 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:09:21,151 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:09:21,153 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:09:21,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:09:21,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:09:21,154 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 3 states. [2018-10-24 12:09:21,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:21,354 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-24 12:09:21,354 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:09:21,355 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2018-10-24 12:09:21,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:21,358 INFO L225 Difference]: With dead ends: 34 [2018-10-24 12:09:21,358 INFO L226 Difference]: Without dead ends: 25 [2018-10-24 12:09:21,359 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 [2018-10-24 12:09:21,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-24 12:09:21,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 20. [2018-10-24 12:09:21,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-24 12:09:21,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2018-10-24 12:09:21,366 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2018-10-24 12:09:21,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:21,366 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2018-10-24 12:09:21,367 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:09:21,367 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2018-10-24 12:09:21,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-24 12:09:21,368 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:21,368 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:21,368 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:21,369 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:21,369 INFO L82 PathProgramCache]: Analyzing trace with hash -1818930225, now seen corresponding path program 1 times [2018-10-24 12:09:21,369 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:21,370 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:21,371 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:21,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:21,371 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:21,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:21,467 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:21,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:21,468 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:21,469 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-10-24 12:09:21,471 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [38], [41], [43], [49], [50], [51], [53] [2018-10-24 12:09:21,534 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:09:21,534 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:09:22,166 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-10-24 12:09:22,168 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. [2018-10-24 12:09:22,202 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:22,202 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-10-24 12:09:22,368 INFO L232 lantSequenceWeakener]: Weakened 16 states. On average, predicates are now at 84.88% of their original sizes. [2018-10-24 12:09:22,369 INFO L411 sIntCurrentIteration]: Unifying AI predicates [2018-10-24 12:09:22,615 INFO L413 sIntCurrentIteration]: We have 17 unified AI predicates [2018-10-24 12:09:22,616 INFO L422 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-10-24 12:09:22,617 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-10-24 12:09:22,617 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [9] imperfect sequences [4] total 11 [2018-10-24 12:09:22,617 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:09:22,618 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:09:22,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:09:22,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:09:22,619 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 9 states. [2018-10-24 12:09:23,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:23,292 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2018-10-24 12:09:23,293 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:09:23,293 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 18 [2018-10-24 12:09:23,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:23,294 INFO L225 Difference]: With dead ends: 41 [2018-10-24 12:09:23,294 INFO L226 Difference]: Without dead ends: 29 [2018-10-24 12:09:23,295 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 [2018-10-24 12:09:23,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-24 12:09:23,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 25. [2018-10-24 12:09:23,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-24 12:09:23,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2018-10-24 12:09:23,303 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 18 [2018-10-24 12:09:23,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:23,303 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2018-10-24 12:09:23,303 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:09:23,304 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2018-10-24 12:09:23,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-24 12:09:23,305 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:23,305 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:23,305 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:23,305 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:23,306 INFO L82 PathProgramCache]: Analyzing trace with hash 1343240274, now seen corresponding path program 1 times [2018-10-24 12:09:23,306 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:23,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:23,307 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:23,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:23,308 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:23,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:23,520 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:09:23,520 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:23,520 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:23,521 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-10-24 12:09:23,521 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [29], [31], [38], [41], [43], [49], [50], [51], [53] [2018-10-24 12:09:23,523 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:09:23,523 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:09:24,094 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:09:24,095 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. [2018-10-24 12:09:24,137 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:24,139 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:09:24,139 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:24,139 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 [2018-10-24 12:09:24,156 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:24,156 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:09:24,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:24,218 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:24,283 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:09:24,283 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:24,511 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:09:24,536 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:24,536 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-10-24 12:09:24,536 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:24,537 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:09:24,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:09:24,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:09:24,538 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 6 states. [2018-10-24 12:09:24,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:24,773 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2018-10-24 12:09:24,774 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:09:24,774 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 24 [2018-10-24 12:09:24,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:24,776 INFO L225 Difference]: With dead ends: 49 [2018-10-24 12:09:24,776 INFO L226 Difference]: Without dead ends: 38 [2018-10-24 12:09:24,777 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:09:24,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-24 12:09:24,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28. [2018-10-24 12:09:24,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-24 12:09:24,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2018-10-24 12:09:24,784 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 24 [2018-10-24 12:09:24,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:24,785 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2018-10-24 12:09:24,785 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:09:24,785 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2018-10-24 12:09:24,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-24 12:09:24,786 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:24,786 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:24,786 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:24,787 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:24,787 INFO L82 PathProgramCache]: Analyzing trace with hash 1859017687, now seen corresponding path program 2 times [2018-10-24 12:09:24,787 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:24,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:24,788 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:24,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:24,788 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:24,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:24,920 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:09:24,920 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:24,920 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:24,922 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:24,922 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:24,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:24,922 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 [2018-10-24 12:09:24,935 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:09:24,935 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:09:24,964 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-24 12:09:24,964 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:24,967 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:25,069 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:09:25,069 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:25,448 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:09:25,470 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:25,471 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 13 [2018-10-24 12:09:25,471 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:25,471 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:09:25,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:09:25,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:09:25,472 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 9 states. [2018-10-24 12:09:25,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:25,696 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2018-10-24 12:09:25,698 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:09:25,698 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2018-10-24 12:09:25,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:25,699 INFO L225 Difference]: With dead ends: 58 [2018-10-24 12:09:25,699 INFO L226 Difference]: Without dead ends: 42 [2018-10-24 12:09:25,700 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:09:25,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-24 12:09:25,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2018-10-24 12:09:25,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-24 12:09:25,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2018-10-24 12:09:25,708 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 27 [2018-10-24 12:09:25,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:25,709 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2018-10-24 12:09:25,709 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:09:25,709 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2018-10-24 12:09:25,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-24 12:09:25,710 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:25,710 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:25,710 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:25,711 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:25,711 INFO L82 PathProgramCache]: Analyzing trace with hash 192508852, now seen corresponding path program 3 times [2018-10-24 12:09:25,711 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:25,712 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:25,712 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:25,712 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:25,712 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:25,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:25,872 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:09:25,873 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:25,873 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:25,873 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:25,873 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:25,873 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:25,874 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 [2018-10-24 12:09:25,889 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:09:25,889 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:09:25,925 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:09:25,926 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:25,928 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:25,952 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:09:25,953 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:26,079 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:09:26,100 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:26,100 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-10-24 12:09:26,100 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:26,101 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:09:26,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:09:26,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:09:26,103 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 8 states. [2018-10-24 12:09:26,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:26,228 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2018-10-24 12:09:26,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:09:26,229 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 39 [2018-10-24 12:09:26,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:26,229 INFO L225 Difference]: With dead ends: 69 [2018-10-24 12:09:26,230 INFO L226 Difference]: Without dead ends: 49 [2018-10-24 12:09:26,230 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:09:26,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-24 12:09:26,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 43. [2018-10-24 12:09:26,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-24 12:09:26,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2018-10-24 12:09:26,239 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 39 [2018-10-24 12:09:26,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:26,240 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2018-10-24 12:09:26,240 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:09:26,240 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2018-10-24 12:09:26,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-10-24 12:09:26,241 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:26,241 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:26,242 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:26,242 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:26,242 INFO L82 PathProgramCache]: Analyzing trace with hash -82233969, now seen corresponding path program 4 times [2018-10-24 12:09:26,242 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:26,243 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:26,243 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:26,243 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:26,244 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:26,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:26,441 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:09:26,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:26,441 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:26,441 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:26,441 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:26,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:26,442 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 [2018-10-24 12:09:26,450 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:26,450 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:09:26,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:26,494 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:26,592 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:09:26,593 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:26,897 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:09:26,918 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:26,918 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-10-24 12:09:26,919 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:26,919 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:09:26,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:09:26,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:09:26,920 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 9 states. [2018-10-24 12:09:27,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:27,202 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2018-10-24 12:09:27,203 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:09:27,203 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 42 [2018-10-24 12:09:27,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:27,204 INFO L225 Difference]: With dead ends: 76 [2018-10-24 12:09:27,205 INFO L226 Difference]: Without dead ends: 56 [2018-10-24 12:09:27,206 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:09:27,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-10-24 12:09:27,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 46. [2018-10-24 12:09:27,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-24 12:09:27,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2018-10-24 12:09:27,219 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 42 [2018-10-24 12:09:27,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:27,219 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2018-10-24 12:09:27,219 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:09:27,220 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2018-10-24 12:09:27,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-24 12:09:27,226 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:27,226 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:27,226 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:27,227 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:27,227 INFO L82 PathProgramCache]: Analyzing trace with hash 1262051796, now seen corresponding path program 5 times [2018-10-24 12:09:27,227 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:27,228 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:27,228 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:27,228 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:27,229 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:27,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:27,422 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 12:09:27,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:27,422 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:27,422 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:27,423 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:27,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:27,423 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 [2018-10-24 12:09:27,431 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:09:27,431 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:09:27,534 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-24 12:09:27,534 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:27,537 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:27,732 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-24 12:09:27,732 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:28,014 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-24 12:09:28,036 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:28,036 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 19 [2018-10-24 12:09:28,036 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:28,037 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:09:28,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:09:28,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=227, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:09:28,038 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 12 states. [2018-10-24 12:09:28,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:28,234 INFO L93 Difference]: Finished difference Result 85 states and 90 transitions. [2018-10-24 12:09:28,234 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:09:28,234 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 45 [2018-10-24 12:09:28,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:28,236 INFO L225 Difference]: With dead ends: 85 [2018-10-24 12:09:28,236 INFO L226 Difference]: Without dead ends: 60 [2018-10-24 12:09:28,237 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=121, Invalid=259, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:09:28,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-24 12:09:28,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2018-10-24 12:09:28,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-24 12:09:28,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2018-10-24 12:09:28,247 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 45 [2018-10-24 12:09:28,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:28,247 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2018-10-24 12:09:28,248 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:09:28,248 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2018-10-24 12:09:28,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-24 12:09:28,249 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:28,249 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:28,249 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:28,249 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:28,249 INFO L82 PathProgramCache]: Analyzing trace with hash -65813737, now seen corresponding path program 6 times [2018-10-24 12:09:28,249 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:28,250 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:28,250 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:28,250 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:28,250 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:28,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:28,358 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:09:28,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:28,358 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:28,358 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:28,358 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:28,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:28,358 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 [2018-10-24 12:09:28,366 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:09:28,366 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:09:28,404 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:09:28,405 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:28,408 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:28,422 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:09:28,422 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:28,545 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:09:28,566 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:28,567 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-10-24 12:09:28,567 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:28,567 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:09:28,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:09:28,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:09:28,568 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand 11 states. [2018-10-24 12:09:28,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:28,720 INFO L93 Difference]: Finished difference Result 96 states and 99 transitions. [2018-10-24 12:09:28,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:09:28,721 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 57 [2018-10-24 12:09:28,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:28,722 INFO L225 Difference]: With dead ends: 96 [2018-10-24 12:09:28,723 INFO L226 Difference]: Without dead ends: 67 [2018-10-24 12:09:28,723 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:09:28,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-24 12:09:28,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 61. [2018-10-24 12:09:28,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-10-24 12:09:28,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2018-10-24 12:09:28,733 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 57 [2018-10-24 12:09:28,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:28,733 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2018-10-24 12:09:28,734 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:09:28,734 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2018-10-24 12:09:28,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-10-24 12:09:28,735 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:28,735 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:28,735 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:28,735 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:28,735 INFO L82 PathProgramCache]: Analyzing trace with hash 1181148210, now seen corresponding path program 7 times [2018-10-24 12:09:28,736 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:28,736 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:28,736 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:28,737 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:28,737 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:28,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:28,945 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:09:28,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:28,946 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:28,946 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:28,946 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:28,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:28,946 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 [2018-10-24 12:09:28,953 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:28,953 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:09:29,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:29,006 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:29,074 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:09:29,074 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:29,249 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:09:29,271 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:29,271 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-10-24 12:09:29,271 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:29,272 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:09:29,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:09:29,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:09:29,273 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand 12 states. [2018-10-24 12:09:29,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:29,497 INFO L93 Difference]: Finished difference Result 103 states and 107 transitions. [2018-10-24 12:09:29,498 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:09:29,498 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 60 [2018-10-24 12:09:29,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:29,499 INFO L225 Difference]: With dead ends: 103 [2018-10-24 12:09:29,499 INFO L226 Difference]: Without dead ends: 74 [2018-10-24 12:09:29,501 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 [2018-10-24 12:09:29,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-24 12:09:29,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 64. [2018-10-24 12:09:29,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-10-24 12:09:29,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2018-10-24 12:09:29,510 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 60 [2018-10-24 12:09:29,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:29,511 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2018-10-24 12:09:29,511 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:09:29,511 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2018-10-24 12:09:29,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-10-24 12:09:29,512 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:29,512 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:29,512 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:29,513 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:29,513 INFO L82 PathProgramCache]: Analyzing trace with hash -2042599113, now seen corresponding path program 8 times [2018-10-24 12:09:29,513 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:29,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:29,514 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:29,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:29,514 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:29,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:29,768 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:09:29,769 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:29,769 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:29,769 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:29,769 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:29,769 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:29,770 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 [2018-10-24 12:09:29,779 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:09:29,779 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:09:29,846 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-24 12:09:29,846 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:29,850 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:29,908 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-24 12:09:29,908 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:30,039 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-24 12:09:30,060 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:30,060 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 25 [2018-10-24 12:09:30,061 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:30,061 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:09:30,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:09:30,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=380, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:09:30,062 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand 15 states. [2018-10-24 12:09:30,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:30,407 INFO L93 Difference]: Finished difference Result 112 states and 117 transitions. [2018-10-24 12:09:30,407 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:09:30,408 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 63 [2018-10-24 12:09:30,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:30,409 INFO L225 Difference]: With dead ends: 112 [2018-10-24 12:09:30,409 INFO L226 Difference]: Without dead ends: 78 [2018-10-24 12:09:30,411 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=226, Invalid=424, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:09:30,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-24 12:09:30,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2018-10-24 12:09:30,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-10-24 12:09:30,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2018-10-24 12:09:30,422 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 63 [2018-10-24 12:09:30,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:30,423 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2018-10-24 12:09:30,423 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:09:30,423 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2018-10-24 12:09:30,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-10-24 12:09:30,424 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:30,424 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:30,424 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:30,425 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:30,425 INFO L82 PathProgramCache]: Analyzing trace with hash -1037724716, now seen corresponding path program 9 times [2018-10-24 12:09:30,425 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:30,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:30,426 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:30,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:30,426 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:30,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:31,418 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:09:31,419 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:31,419 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:31,419 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:31,419 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:31,419 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:31,419 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 [2018-10-24 12:09:31,427 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:09:31,427 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:09:31,490 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:09:31,490 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:31,494 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:31,522 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:09:31,522 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:31,788 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:09:31,808 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:31,809 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-10-24 12:09:31,809 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:31,809 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:09:31,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:09:31,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:09:31,810 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand 14 states. [2018-10-24 12:09:32,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:32,004 INFO L93 Difference]: Finished difference Result 123 states and 126 transitions. [2018-10-24 12:09:32,004 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:09:32,005 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 75 [2018-10-24 12:09:32,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:32,006 INFO L225 Difference]: With dead ends: 123 [2018-10-24 12:09:32,006 INFO L226 Difference]: Without dead ends: 85 [2018-10-24 12:09:32,007 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:09:32,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-24 12:09:32,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 79. [2018-10-24 12:09:32,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-24 12:09:32,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-10-24 12:09:32,031 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 75 [2018-10-24 12:09:32,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:32,031 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-10-24 12:09:32,031 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:09:32,032 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-10-24 12:09:32,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-10-24 12:09:32,041 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:32,041 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:32,041 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:32,041 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:32,041 INFO L82 PathProgramCache]: Analyzing trace with hash -448084945, now seen corresponding path program 10 times [2018-10-24 12:09:32,042 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:32,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:32,042 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:32,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:32,043 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:32,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:32,241 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:09:32,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:32,241 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:32,241 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:32,242 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:32,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:32,242 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 [2018-10-24 12:09:32,251 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:32,251 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:09:32,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:32,317 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:32,342 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:09:32,342 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:32,737 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:09:32,759 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:32,760 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-10-24 12:09:32,760 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:32,760 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:09:32,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:09:32,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:09:32,762 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 15 states. [2018-10-24 12:09:33,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:33,012 INFO L93 Difference]: Finished difference Result 130 states and 134 transitions. [2018-10-24 12:09:33,013 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:09:33,013 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 78 [2018-10-24 12:09:33,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:33,014 INFO L225 Difference]: With dead ends: 130 [2018-10-24 12:09:33,014 INFO L226 Difference]: Without dead ends: 92 [2018-10-24 12:09:33,015 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:09:33,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-10-24 12:09:33,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 82. [2018-10-24 12:09:33,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-10-24 12:09:33,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2018-10-24 12:09:33,027 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 78 [2018-10-24 12:09:33,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:33,027 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2018-10-24 12:09:33,027 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:09:33,028 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2018-10-24 12:09:33,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-10-24 12:09:33,029 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:33,029 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:33,029 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:33,030 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:33,030 INFO L82 PathProgramCache]: Analyzing trace with hash -905907724, now seen corresponding path program 11 times [2018-10-24 12:09:33,030 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:33,031 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:33,031 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:33,031 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:33,031 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:33,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:33,990 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:09:33,990 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:33,990 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:33,990 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:33,990 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:33,991 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:33,991 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 [2018-10-24 12:09:33,999 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:09:33,999 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:09:34,084 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-24 12:09:34,084 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:34,087 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:34,134 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-24 12:09:34,134 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:34,980 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-24 12:09:35,001 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:35,002 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 31 [2018-10-24 12:09:35,002 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:35,002 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:09:35,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:09:35,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=569, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:09:35,005 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand 18 states. [2018-10-24 12:09:35,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:35,338 INFO L93 Difference]: Finished difference Result 139 states and 144 transitions. [2018-10-24 12:09:35,339 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:09:35,339 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 81 [2018-10-24 12:09:35,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:35,341 INFO L225 Difference]: With dead ends: 139 [2018-10-24 12:09:35,341 INFO L226 Difference]: Without dead ends: 96 [2018-10-24 12:09:35,342 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=367, Invalid=625, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:09:35,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-24 12:09:35,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 94. [2018-10-24 12:09:35,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-10-24 12:09:35,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2018-10-24 12:09:35,352 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 81 [2018-10-24 12:09:35,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:35,353 INFO L481 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2018-10-24 12:09:35,353 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:09:35,353 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2018-10-24 12:09:35,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-10-24 12:09:35,354 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:35,354 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:35,354 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:35,354 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:35,354 INFO L82 PathProgramCache]: Analyzing trace with hash 773593207, now seen corresponding path program 12 times [2018-10-24 12:09:35,355 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:35,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:35,355 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:35,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:35,355 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:35,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:35,572 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:09:35,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:35,573 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:35,573 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:35,573 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:35,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:35,573 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 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 [2018-10-24 12:09:35,581 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:09:35,581 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:09:35,650 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:09:35,650 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:35,654 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:35,675 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:09:35,675 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:35,948 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:09:35,969 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:35,969 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-10-24 12:09:35,969 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:35,970 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:09:35,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:09:35,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:09:35,971 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand 17 states. [2018-10-24 12:09:36,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:36,165 INFO L93 Difference]: Finished difference Result 150 states and 153 transitions. [2018-10-24 12:09:36,165 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:09:36,165 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 93 [2018-10-24 12:09:36,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:36,167 INFO L225 Difference]: With dead ends: 150 [2018-10-24 12:09:36,167 INFO L226 Difference]: Without dead ends: 103 [2018-10-24 12:09:36,168 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:09:36,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-24 12:09:36,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 97. [2018-10-24 12:09:36,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-10-24 12:09:36,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-10-24 12:09:36,178 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 93 [2018-10-24 12:09:36,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:36,179 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-10-24 12:09:36,179 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:09:36,179 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-10-24 12:09:36,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-24 12:09:36,179 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:36,180 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:36,180 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:36,180 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:36,180 INFO L82 PathProgramCache]: Analyzing trace with hash -1075443694, now seen corresponding path program 13 times [2018-10-24 12:09:36,180 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:36,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:36,181 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:36,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:36,181 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:36,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:36,443 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:09:36,443 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:36,443 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:36,443 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:36,443 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:36,443 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:36,443 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 [2018-10-24 12:09:36,451 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:36,451 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:09:36,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:36,527 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:36,579 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:09:36,579 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:36,916 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:09:36,937 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:36,937 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-10-24 12:09:36,937 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:36,937 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:09:36,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:09:36,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:09:36,938 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 18 states. [2018-10-24 12:09:37,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:37,146 INFO L93 Difference]: Finished difference Result 157 states and 161 transitions. [2018-10-24 12:09:37,146 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:09:37,146 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 96 [2018-10-24 12:09:37,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:37,148 INFO L225 Difference]: With dead ends: 157 [2018-10-24 12:09:37,148 INFO L226 Difference]: Without dead ends: 110 [2018-10-24 12:09:37,150 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 177 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:09:37,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2018-10-24 12:09:37,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 100. [2018-10-24 12:09:37,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-10-24 12:09:37,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2018-10-24 12:09:37,161 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 96 [2018-10-24 12:09:37,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:37,161 INFO L481 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2018-10-24 12:09:37,161 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:09:37,162 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2018-10-24 12:09:37,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:09:37,162 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:37,163 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:37,163 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:37,163 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:37,163 INFO L82 PathProgramCache]: Analyzing trace with hash 1516777111, now seen corresponding path program 14 times [2018-10-24 12:09:37,163 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:37,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:37,164 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:37,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:37,164 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:37,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:37,682 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:09:37,682 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:37,682 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:37,682 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:37,682 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:37,682 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:37,682 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 [2018-10-24 12:09:37,690 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:09:37,690 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:09:37,832 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-10-24 12:09:37,832 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:37,835 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:37,896 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-24 12:09:37,897 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:38,654 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-24 12:09:38,676 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:38,676 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 37 [2018-10-24 12:09:38,676 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:38,677 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:09:38,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:09:38,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=538, Invalid=794, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:09:38,678 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand 21 states. [2018-10-24 12:09:38,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:38,961 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2018-10-24 12:09:38,962 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:09:38,962 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 99 [2018-10-24 12:09:38,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:38,963 INFO L225 Difference]: With dead ends: 166 [2018-10-24 12:09:38,963 INFO L226 Difference]: Without dead ends: 114 [2018-10-24 12:09:38,964 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=544, Invalid=862, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:09:38,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-24 12:09:38,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2018-10-24 12:09:38,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-10-24 12:09:38,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2018-10-24 12:09:38,979 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 99 [2018-10-24 12:09:38,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:38,979 INFO L481 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2018-10-24 12:09:38,979 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:09:38,979 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2018-10-24 12:09:38,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-10-24 12:09:38,980 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:38,980 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:38,981 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:38,981 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:38,981 INFO L82 PathProgramCache]: Analyzing trace with hash 280509428, now seen corresponding path program 15 times [2018-10-24 12:09:38,981 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:38,982 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:38,982 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:38,982 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:38,982 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:39,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:39,354 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:09:39,354 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:39,354 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:39,354 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:39,355 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:39,355 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:39,355 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 [2018-10-24 12:09:39,363 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:09:39,363 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:09:39,454 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:09:39,455 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:39,459 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:39,506 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:09:39,507 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:40,533 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:09:40,554 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:40,554 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-10-24 12:09:40,554 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:40,554 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:09:40,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:09:40,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:09:40,555 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand 20 states. [2018-10-24 12:09:40,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:40,763 INFO L93 Difference]: Finished difference Result 177 states and 180 transitions. [2018-10-24 12:09:40,763 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:09:40,763 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 111 [2018-10-24 12:09:40,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:40,764 INFO L225 Difference]: With dead ends: 177 [2018-10-24 12:09:40,764 INFO L226 Difference]: Without dead ends: 121 [2018-10-24 12:09:40,766 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:09:40,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-10-24 12:09:40,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 115. [2018-10-24 12:09:40,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-24 12:09:40,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 116 transitions. [2018-10-24 12:09:40,779 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 116 transitions. Word has length 111 [2018-10-24 12:09:40,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:40,779 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 116 transitions. [2018-10-24 12:09:40,780 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:09:40,780 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 116 transitions. [2018-10-24 12:09:40,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-10-24 12:09:40,781 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:40,781 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:40,781 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:40,781 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:40,781 INFO L82 PathProgramCache]: Analyzing trace with hash -1179804977, now seen corresponding path program 16 times [2018-10-24 12:09:40,782 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:40,782 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:40,782 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:40,782 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:40,782 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:40,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:41,090 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:09:41,091 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:41,091 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:41,091 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:41,091 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:41,091 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:41,091 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 [2018-10-24 12:09:41,099 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:41,099 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:09:41,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:41,183 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:41,206 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:09:41,206 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:41,599 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:09:41,620 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:41,621 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-10-24 12:09:41,621 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:41,621 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:09:41,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:09:41,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:09:41,622 INFO L87 Difference]: Start difference. First operand 115 states and 116 transitions. Second operand 21 states. [2018-10-24 12:09:41,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:41,881 INFO L93 Difference]: Finished difference Result 184 states and 188 transitions. [2018-10-24 12:09:41,881 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:09:41,881 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 114 [2018-10-24 12:09:41,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:41,882 INFO L225 Difference]: With dead ends: 184 [2018-10-24 12:09:41,883 INFO L226 Difference]: Without dead ends: 128 [2018-10-24 12:09:41,884 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 [2018-10-24 12:09:41,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-10-24 12:09:41,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 118. [2018-10-24 12:09:41,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-10-24 12:09:41,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2018-10-24 12:09:41,897 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 114 [2018-10-24 12:09:41,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:41,897 INFO L481 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2018-10-24 12:09:41,898 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:09:41,898 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2018-10-24 12:09:41,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-10-24 12:09:41,899 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:41,899 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:41,899 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:41,899 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:41,899 INFO L82 PathProgramCache]: Analyzing trace with hash -1682503148, now seen corresponding path program 17 times [2018-10-24 12:09:41,899 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:41,900 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:41,900 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:41,900 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:41,901 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:41,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:42,840 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:09:42,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:42,841 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:42,841 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:42,841 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:42,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:42,841 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 [2018-10-24 12:09:42,849 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:09:42,849 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:09:43,089 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2018-10-24 12:09:43,089 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:43,093 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:43,133 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-10-24 12:09:43,133 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:43,554 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-10-24 12:09:43,576 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:43,576 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 43 [2018-10-24 12:09:43,576 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:43,577 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:09:43,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:09:43,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=751, Invalid=1055, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:09:43,578 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand 24 states. [2018-10-24 12:09:43,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:43,856 INFO L93 Difference]: Finished difference Result 193 states and 198 transitions. [2018-10-24 12:09:43,856 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:09:43,856 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 117 [2018-10-24 12:09:43,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:43,857 INFO L225 Difference]: With dead ends: 193 [2018-10-24 12:09:43,857 INFO L226 Difference]: Without dead ends: 132 [2018-10-24 12:09:43,858 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=757, Invalid=1135, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:09:43,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-10-24 12:09:43,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 130. [2018-10-24 12:09:43,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-10-24 12:09:43,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2018-10-24 12:09:43,869 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 117 [2018-10-24 12:09:43,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:43,870 INFO L481 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2018-10-24 12:09:43,870 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:09:43,870 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2018-10-24 12:09:43,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:09:43,870 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:43,870 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:43,871 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:43,871 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:43,871 INFO L82 PathProgramCache]: Analyzing trace with hash 1944856023, now seen corresponding path program 18 times [2018-10-24 12:09:43,871 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:43,871 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:43,872 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:43,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:43,872 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:43,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:44,218 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:09:44,219 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:44,219 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:44,219 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:44,219 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:44,219 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:44,219 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 [2018-10-24 12:09:44,231 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:09:44,231 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:09:44,324 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:09:44,324 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:44,327 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:44,356 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:09:44,356 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:45,177 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:09:45,198 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:45,198 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-10-24 12:09:45,199 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:45,199 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:09:45,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:09:45,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:09:45,200 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand 23 states. [2018-10-24 12:09:45,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:45,440 INFO L93 Difference]: Finished difference Result 204 states and 207 transitions. [2018-10-24 12:09:45,440 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:09:45,440 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 129 [2018-10-24 12:09:45,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:45,442 INFO L225 Difference]: With dead ends: 204 [2018-10-24 12:09:45,442 INFO L226 Difference]: Without dead ends: 139 [2018-10-24 12:09:45,443 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 238 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:09:45,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-24 12:09:45,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 133. [2018-10-24 12:09:45,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-10-24 12:09:45,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 134 transitions. [2018-10-24 12:09:45,458 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 134 transitions. Word has length 129 [2018-10-24 12:09:45,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:45,459 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 134 transitions. [2018-10-24 12:09:45,459 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:09:45,459 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 134 transitions. [2018-10-24 12:09:45,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-10-24 12:09:45,460 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:45,460 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:45,460 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:45,461 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:45,461 INFO L82 PathProgramCache]: Analyzing trace with hash 709338098, now seen corresponding path program 19 times [2018-10-24 12:09:45,461 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:45,462 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:45,462 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:45,462 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:45,462 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:45,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:46,032 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:09:46,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:46,033 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:46,033 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:46,033 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:46,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:46,033 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 [2018-10-24 12:09:46,041 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:46,041 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:09:46,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:46,136 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:46,166 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:09:46,166 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:46,689 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:09:46,711 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:46,711 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-10-24 12:09:46,711 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:46,711 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:09:46,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:09:46,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:09:46,713 INFO L87 Difference]: Start difference. First operand 133 states and 134 transitions. Second operand 24 states. [2018-10-24 12:09:46,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:46,927 INFO L93 Difference]: Finished difference Result 211 states and 215 transitions. [2018-10-24 12:09:46,929 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:09:46,929 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 132 [2018-10-24 12:09:46,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:46,930 INFO L225 Difference]: With dead ends: 211 [2018-10-24 12:09:46,930 INFO L226 Difference]: Without dead ends: 146 [2018-10-24 12:09:46,931 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:09:46,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2018-10-24 12:09:46,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 136. [2018-10-24 12:09:46,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-10-24 12:09:46,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2018-10-24 12:09:46,945 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 132 [2018-10-24 12:09:46,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:46,946 INFO L481 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2018-10-24 12:09:46,946 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:09:46,946 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2018-10-24 12:09:46,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-10-24 12:09:46,947 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:46,947 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:46,947 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:46,947 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:46,947 INFO L82 PathProgramCache]: Analyzing trace with hash 1264561143, now seen corresponding path program 20 times [2018-10-24 12:09:46,947 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:46,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:46,948 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:46,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:46,948 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:46,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:47,626 INFO L134 CoverageAnalysis]: Checked inductivity of 1223 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:09:47,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:47,626 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:47,626 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:47,626 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:47,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:47,627 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 [2018-10-24 12:09:47,634 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:09:47,634 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:09:48,037 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2018-10-24 12:09:48,037 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:48,042 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:48,114 INFO L134 CoverageAnalysis]: Checked inductivity of 1223 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-10-24 12:09:48,114 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:48,725 INFO L134 CoverageAnalysis]: Checked inductivity of 1223 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-10-24 12:09:48,748 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:48,749 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 49 [2018-10-24 12:09:48,749 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:48,749 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:09:48,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:09:48,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1000, Invalid=1352, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:09:48,750 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand 27 states. [2018-10-24 12:09:49,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:49,012 INFO L93 Difference]: Finished difference Result 220 states and 225 transitions. [2018-10-24 12:09:49,012 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:09:49,013 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 135 [2018-10-24 12:09:49,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:49,014 INFO L225 Difference]: With dead ends: 220 [2018-10-24 12:09:49,014 INFO L226 Difference]: Without dead ends: 150 [2018-10-24 12:09:49,016 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 246 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1006, Invalid=1444, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:09:49,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-10-24 12:09:49,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 148. [2018-10-24 12:09:49,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2018-10-24 12:09:49,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 149 transitions. [2018-10-24 12:09:49,035 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 149 transitions. Word has length 135 [2018-10-24 12:09:49,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:49,036 INFO L481 AbstractCegarLoop]: Abstraction has 148 states and 149 transitions. [2018-10-24 12:09:49,036 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:09:49,036 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 149 transitions. [2018-10-24 12:09:49,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-10-24 12:09:49,037 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:49,037 INFO L375 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:49,037 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:49,037 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:49,037 INFO L82 PathProgramCache]: Analyzing trace with hash 1991732244, now seen corresponding path program 21 times [2018-10-24 12:09:49,037 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:49,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:49,038 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:49,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:49,038 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:49,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:50,206 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:09:50,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:50,206 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:50,206 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:50,207 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:50,207 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:50,207 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 [2018-10-24 12:09:50,214 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:09:50,214 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:09:50,313 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:09:50,314 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:50,319 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:50,401 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:09:50,401 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:51,229 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:09:51,251 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:51,251 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-10-24 12:09:51,251 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:51,251 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:09:51,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:09:51,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:09:51,253 INFO L87 Difference]: Start difference. First operand 148 states and 149 transitions. Second operand 26 states. [2018-10-24 12:09:51,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:51,663 INFO L93 Difference]: Finished difference Result 231 states and 234 transitions. [2018-10-24 12:09:51,664 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:09:51,664 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 147 [2018-10-24 12:09:51,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:51,665 INFO L225 Difference]: With dead ends: 231 [2018-10-24 12:09:51,665 INFO L226 Difference]: Without dead ends: 157 [2018-10-24 12:09:51,666 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 271 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:09:51,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-24 12:09:51,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 151. [2018-10-24 12:09:51,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-10-24 12:09:51,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 152 transitions. [2018-10-24 12:09:51,680 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 152 transitions. Word has length 147 [2018-10-24 12:09:51,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:51,681 INFO L481 AbstractCegarLoop]: Abstraction has 151 states and 152 transitions. [2018-10-24 12:09:51,681 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:09:51,681 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 152 transitions. [2018-10-24 12:09:51,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-10-24 12:09:51,681 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:51,681 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:51,682 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:51,682 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:51,682 INFO L82 PathProgramCache]: Analyzing trace with hash -110642833, now seen corresponding path program 22 times [2018-10-24 12:09:51,682 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:51,683 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:51,683 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:51,683 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:51,683 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:51,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:52,194 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:09:52,194 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:52,194 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:52,194 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:52,194 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:52,194 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:52,194 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 [2018-10-24 12:09:52,204 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:52,204 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:09:52,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:52,314 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:52,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:09:52,370 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:53,027 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:09:53,049 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:53,049 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-10-24 12:09:53,049 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:53,050 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:09:53,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:09:53,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:09:53,051 INFO L87 Difference]: Start difference. First operand 151 states and 152 transitions. Second operand 27 states. [2018-10-24 12:09:53,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:53,318 INFO L93 Difference]: Finished difference Result 238 states and 242 transitions. [2018-10-24 12:09:53,318 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:09:53,318 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 150 [2018-10-24 12:09:53,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:53,319 INFO L225 Difference]: With dead ends: 238 [2018-10-24 12:09:53,319 INFO L226 Difference]: Without dead ends: 164 [2018-10-24 12:09:53,321 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 276 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:09:53,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2018-10-24 12:09:53,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 154. [2018-10-24 12:09:53,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:09:53,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 155 transitions. [2018-10-24 12:09:53,337 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 155 transitions. Word has length 150 [2018-10-24 12:09:53,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:53,338 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 155 transitions. [2018-10-24 12:09:53,338 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:09:53,338 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 155 transitions. [2018-10-24 12:09:53,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-10-24 12:09:53,339 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:53,339 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:53,339 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:53,339 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:53,339 INFO L82 PathProgramCache]: Analyzing trace with hash 1541515828, now seen corresponding path program 23 times [2018-10-24 12:09:53,340 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:53,340 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:53,340 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:53,340 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:53,341 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:53,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:54,706 INFO L134 CoverageAnalysis]: Checked inductivity of 1613 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:09:54,706 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:54,706 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:54,706 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:54,706 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:54,706 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:54,707 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 [2018-10-24 12:09:54,714 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:09:54,714 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:09:55,482 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-10-24 12:09:55,482 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:55,488 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:55,556 INFO L134 CoverageAnalysis]: Checked inductivity of 1613 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-24 12:09:55,556 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:56,262 INFO L134 CoverageAnalysis]: Checked inductivity of 1613 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-24 12:09:56,284 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:56,284 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 55 [2018-10-24 12:09:56,284 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:56,284 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:09:56,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:09:56,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1285, Invalid=1685, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:09:56,286 INFO L87 Difference]: Start difference. First operand 154 states and 155 transitions. Second operand 30 states. [2018-10-24 12:09:57,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:57,361 INFO L93 Difference]: Finished difference Result 247 states and 252 transitions. [2018-10-24 12:09:57,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:09:57,361 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 153 [2018-10-24 12:09:57,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:57,363 INFO L225 Difference]: With dead ends: 247 [2018-10-24 12:09:57,363 INFO L226 Difference]: Without dead ends: 168 [2018-10-24 12:09:57,365 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1291, Invalid=1789, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:09:57,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2018-10-24 12:09:57,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 166. [2018-10-24 12:09:57,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-10-24 12:09:57,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 167 transitions. [2018-10-24 12:09:57,381 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 167 transitions. Word has length 153 [2018-10-24 12:09:57,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:57,381 INFO L481 AbstractCegarLoop]: Abstraction has 166 states and 167 transitions. [2018-10-24 12:09:57,382 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:09:57,382 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 167 transitions. [2018-10-24 12:09:57,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-10-24 12:09:57,382 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:57,382 INFO L375 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:57,383 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:57,383 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:57,383 INFO L82 PathProgramCache]: Analyzing trace with hash 1394469687, now seen corresponding path program 24 times [2018-10-24 12:09:57,383 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:57,384 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:57,384 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:57,384 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:57,384 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:57,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:57,940 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:09:57,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:57,940 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:57,940 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:57,940 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:57,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:57,941 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 [2018-10-24 12:09:57,972 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:09:57,973 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:09:58,085 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:09:58,085 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:58,091 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:58,216 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:09:58,217 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:00,591 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:10:00,612 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:00,613 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-10-24 12:10:00,613 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:00,613 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:10:00,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:10:00,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:10:00,615 INFO L87 Difference]: Start difference. First operand 166 states and 167 transitions. Second operand 29 states. [2018-10-24 12:10:00,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:00,869 INFO L93 Difference]: Finished difference Result 258 states and 261 transitions. [2018-10-24 12:10:00,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:10:00,869 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 165 [2018-10-24 12:10:00,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:00,870 INFO L225 Difference]: With dead ends: 258 [2018-10-24 12:10:00,870 INFO L226 Difference]: Without dead ends: 175 [2018-10-24 12:10:00,872 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 304 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:10:00,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-10-24 12:10:00,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 169. [2018-10-24 12:10:00,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-10-24 12:10:00,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2018-10-24 12:10:00,888 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 165 [2018-10-24 12:10:00,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:00,889 INFO L481 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2018-10-24 12:10:00,889 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:10:00,889 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2018-10-24 12:10:00,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-10-24 12:10:00,890 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:00,890 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:00,890 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:00,890 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:00,890 INFO L82 PathProgramCache]: Analyzing trace with hash -456804398, now seen corresponding path program 25 times [2018-10-24 12:10:00,890 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:00,891 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:00,891 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:00,891 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:00,891 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:00,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:01,657 INFO L134 CoverageAnalysis]: Checked inductivity of 1977 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:10:01,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:01,657 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:01,657 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:01,657 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:01,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:01,657 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 [2018-10-24 12:10:01,666 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:01,666 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:01,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:01,792 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:01,883 INFO L134 CoverageAnalysis]: Checked inductivity of 1977 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:10:01,883 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:02,710 INFO L134 CoverageAnalysis]: Checked inductivity of 1977 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:10:02,731 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:02,731 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-10-24 12:10:02,732 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:02,732 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:10:02,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:10:02,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:10:02,733 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand 30 states. [2018-10-24 12:10:03,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:03,161 INFO L93 Difference]: Finished difference Result 265 states and 269 transitions. [2018-10-24 12:10:03,161 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:10:03,162 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 168 [2018-10-24 12:10:03,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:03,163 INFO L225 Difference]: With dead ends: 265 [2018-10-24 12:10:03,163 INFO L226 Difference]: Without dead ends: 182 [2018-10-24 12:10:03,164 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 309 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:10:03,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-10-24 12:10:03,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 172. [2018-10-24 12:10:03,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-10-24 12:10:03,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 173 transitions. [2018-10-24 12:10:03,186 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 173 transitions. Word has length 168 [2018-10-24 12:10:03,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:03,187 INFO L481 AbstractCegarLoop]: Abstraction has 172 states and 173 transitions. [2018-10-24 12:10:03,187 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:10:03,187 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 173 transitions. [2018-10-24 12:10:03,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2018-10-24 12:10:03,188 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:03,188 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:03,188 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:03,189 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:03,189 INFO L82 PathProgramCache]: Analyzing trace with hash -88022697, now seen corresponding path program 26 times [2018-10-24 12:10:03,189 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:03,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:03,189 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:03,190 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:03,190 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:03,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:04,821 INFO L134 CoverageAnalysis]: Checked inductivity of 2057 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:10:04,822 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:04,822 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:04,822 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:04,822 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:04,822 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:04,822 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 [2018-10-24 12:10:04,831 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:04,831 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:06,136 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2018-10-24 12:10:06,136 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:06,143 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:06,387 INFO L134 CoverageAnalysis]: Checked inductivity of 2057 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-24 12:10:06,387 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:07,674 INFO L134 CoverageAnalysis]: Checked inductivity of 2057 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-24 12:10:07,709 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:07,709 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 61 [2018-10-24 12:10:07,709 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:07,710 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:10:07,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:10:07,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1606, Invalid=2054, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:10:07,711 INFO L87 Difference]: Start difference. First operand 172 states and 173 transitions. Second operand 33 states. [2018-10-24 12:10:08,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:08,057 INFO L93 Difference]: Finished difference Result 274 states and 279 transitions. [2018-10-24 12:10:08,057 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:10:08,057 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 171 [2018-10-24 12:10:08,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:08,058 INFO L225 Difference]: With dead ends: 274 [2018-10-24 12:10:08,059 INFO L226 Difference]: Without dead ends: 186 [2018-10-24 12:10:08,060 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 312 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1612, Invalid=2170, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:10:08,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-10-24 12:10:08,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 184. [2018-10-24 12:10:08,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-10-24 12:10:08,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 185 transitions. [2018-10-24 12:10:08,080 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 185 transitions. Word has length 171 [2018-10-24 12:10:08,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:08,081 INFO L481 AbstractCegarLoop]: Abstraction has 184 states and 185 transitions. [2018-10-24 12:10:08,081 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:10:08,081 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 185 transitions. [2018-10-24 12:10:08,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2018-10-24 12:10:08,081 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:08,082 INFO L375 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:08,082 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:08,082 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:08,082 INFO L82 PathProgramCache]: Analyzing trace with hash 841557044, now seen corresponding path program 27 times [2018-10-24 12:10:08,082 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:08,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:08,083 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:08,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:08,083 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:08,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:08,859 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:10:08,860 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:08,860 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:08,860 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:08,860 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:08,860 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:08,860 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 [2018-10-24 12:10:08,870 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:08,870 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:09,000 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:09,000 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:09,004 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:09,049 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:10:09,049 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:10,011 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:10:10,033 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:10,033 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-10-24 12:10:10,033 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:10,034 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:10:10,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:10:10,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:10:10,035 INFO L87 Difference]: Start difference. First operand 184 states and 185 transitions. Second operand 32 states. [2018-10-24 12:10:10,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:10,475 INFO L93 Difference]: Finished difference Result 285 states and 288 transitions. [2018-10-24 12:10:10,475 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:10:10,475 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 183 [2018-10-24 12:10:10,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:10,476 INFO L225 Difference]: With dead ends: 285 [2018-10-24 12:10:10,476 INFO L226 Difference]: Without dead ends: 193 [2018-10-24 12:10:10,478 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 337 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:10:10,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-10-24 12:10:10,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 187. [2018-10-24 12:10:10,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-10-24 12:10:10,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 188 transitions. [2018-10-24 12:10:10,504 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 188 transitions. Word has length 183 [2018-10-24 12:10:10,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:10,504 INFO L481 AbstractCegarLoop]: Abstraction has 187 states and 188 transitions. [2018-10-24 12:10:10,504 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:10:10,505 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 188 transitions. [2018-10-24 12:10:10,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-10-24 12:10:10,506 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:10,506 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:10,506 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:10,506 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:10,506 INFO L82 PathProgramCache]: Analyzing trace with hash -1809899505, now seen corresponding path program 28 times [2018-10-24 12:10:10,506 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:10,507 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:10,507 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:10,507 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:10,507 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:10,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:11,344 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:10:11,344 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:11,344 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:11,344 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:11,345 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:11,345 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:11,345 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 [2018-10-24 12:10:11,352 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:11,352 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:11,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:11,486 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:11,529 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:10:11,529 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:12,571 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:10:12,593 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:12,593 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2018-10-24 12:10:12,593 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:12,594 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:10:12,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:10:12,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:10:12,594 INFO L87 Difference]: Start difference. First operand 187 states and 188 transitions. Second operand 33 states. [2018-10-24 12:10:12,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:12,930 INFO L93 Difference]: Finished difference Result 292 states and 296 transitions. [2018-10-24 12:10:12,931 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:10:12,931 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 186 [2018-10-24 12:10:12,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:12,933 INFO L225 Difference]: With dead ends: 292 [2018-10-24 12:10:12,933 INFO L226 Difference]: Without dead ends: 200 [2018-10-24 12:10:12,934 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:10:12,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2018-10-24 12:10:12,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 190. [2018-10-24 12:10:12,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2018-10-24 12:10:12,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 191 transitions. [2018-10-24 12:10:12,963 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 191 transitions. Word has length 186 [2018-10-24 12:10:12,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:12,963 INFO L481 AbstractCegarLoop]: Abstraction has 190 states and 191 transitions. [2018-10-24 12:10:12,963 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:10:12,963 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 191 transitions. [2018-10-24 12:10:12,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-10-24 12:10:12,965 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:12,965 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:12,965 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:12,965 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:12,965 INFO L82 PathProgramCache]: Analyzing trace with hash 1686557268, now seen corresponding path program 29 times [2018-10-24 12:10:12,966 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:12,966 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:12,966 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:12,967 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:12,967 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:12,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:13,741 INFO L134 CoverageAnalysis]: Checked inductivity of 2555 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:10:13,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:13,741 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:13,741 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:13,741 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:13,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:13,741 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 [2018-10-24 12:10:13,748 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:13,749 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:15,702 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2018-10-24 12:10:15,702 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:15,709 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:15,984 INFO L134 CoverageAnalysis]: Checked inductivity of 2555 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1365 trivial. 0 not checked. [2018-10-24 12:10:15,984 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:17,008 INFO L134 CoverageAnalysis]: Checked inductivity of 2555 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1365 trivial. 0 not checked. [2018-10-24 12:10:17,031 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:17,031 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 67 [2018-10-24 12:10:17,031 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:17,031 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:10:17,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:10:17,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1963, Invalid=2459, Unknown=0, NotChecked=0, Total=4422 [2018-10-24 12:10:17,033 INFO L87 Difference]: Start difference. First operand 190 states and 191 transitions. Second operand 36 states. [2018-10-24 12:10:17,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:17,451 INFO L93 Difference]: Finished difference Result 301 states and 306 transitions. [2018-10-24 12:10:17,451 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:10:17,452 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 189 [2018-10-24 12:10:17,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:17,454 INFO L225 Difference]: With dead ends: 301 [2018-10-24 12:10:17,454 INFO L226 Difference]: Without dead ends: 204 [2018-10-24 12:10:17,456 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 345 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1969, Invalid=2587, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:10:17,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2018-10-24 12:10:17,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 202. [2018-10-24 12:10:17,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2018-10-24 12:10:17,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 203 transitions. [2018-10-24 12:10:17,483 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 203 transitions. Word has length 189 [2018-10-24 12:10:17,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:17,483 INFO L481 AbstractCegarLoop]: Abstraction has 202 states and 203 transitions. [2018-10-24 12:10:17,483 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:10:17,483 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 203 transitions. [2018-10-24 12:10:17,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2018-10-24 12:10:17,484 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:17,485 INFO L375 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:17,485 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:17,485 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:17,485 INFO L82 PathProgramCache]: Analyzing trace with hash 852191383, now seen corresponding path program 30 times [2018-10-24 12:10:17,485 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:17,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:17,486 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:17,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:17,486 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:17,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:19,005 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:10:19,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:19,006 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:19,006 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:19,006 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:19,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:19,006 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 [2018-10-24 12:10:19,013 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:19,014 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:19,163 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:19,163 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:19,170 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:19,319 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:10:19,319 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:20,923 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:10:20,956 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:20,956 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2018-10-24 12:10:20,957 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:20,957 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 12:10:20,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 12:10:20,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-24 12:10:20,958 INFO L87 Difference]: Start difference. First operand 202 states and 203 transitions. Second operand 35 states. [2018-10-24 12:10:21,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:21,399 INFO L93 Difference]: Finished difference Result 312 states and 315 transitions. [2018-10-24 12:10:21,399 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:10:21,399 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 201 [2018-10-24 12:10:21,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:21,400 INFO L225 Difference]: With dead ends: 312 [2018-10-24 12:10:21,400 INFO L226 Difference]: Without dead ends: 211 [2018-10-24 12:10:21,402 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 370 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-24 12:10:21,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2018-10-24 12:10:21,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 205. [2018-10-24 12:10:21,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-10-24 12:10:21,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 206 transitions. [2018-10-24 12:10:21,434 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 206 transitions. Word has length 201 [2018-10-24 12:10:21,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:21,434 INFO L481 AbstractCegarLoop]: Abstraction has 205 states and 206 transitions. [2018-10-24 12:10:21,434 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 12:10:21,434 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 206 transitions. [2018-10-24 12:10:21,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-10-24 12:10:21,435 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:21,435 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:21,436 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:21,436 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:21,436 INFO L82 PathProgramCache]: Analyzing trace with hash -535149646, now seen corresponding path program 31 times [2018-10-24 12:10:21,436 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:21,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:21,437 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:21,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:21,437 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:21,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:22,104 INFO L134 CoverageAnalysis]: Checked inductivity of 3009 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:10:22,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:22,104 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:22,105 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:22,105 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:22,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:22,105 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 [2018-10-24 12:10:22,113 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:22,113 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:22,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:22,270 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:22,336 INFO L134 CoverageAnalysis]: Checked inductivity of 3009 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:10:22,336 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:23,646 INFO L134 CoverageAnalysis]: Checked inductivity of 3009 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:10:23,668 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:23,669 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-10-24 12:10:23,669 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:23,669 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:10:23,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:10:23,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:10:23,671 INFO L87 Difference]: Start difference. First operand 205 states and 206 transitions. Second operand 36 states. [2018-10-24 12:10:24,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:24,116 INFO L93 Difference]: Finished difference Result 319 states and 323 transitions. [2018-10-24 12:10:24,116 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:10:24,116 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 204 [2018-10-24 12:10:24,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:24,118 INFO L225 Difference]: With dead ends: 319 [2018-10-24 12:10:24,118 INFO L226 Difference]: Without dead ends: 218 [2018-10-24 12:10:24,119 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 442 GetRequests, 375 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:10:24,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2018-10-24 12:10:24,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 208. [2018-10-24 12:10:24,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2018-10-24 12:10:24,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 209 transitions. [2018-10-24 12:10:24,145 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 209 transitions. Word has length 204 [2018-10-24 12:10:24,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:24,145 INFO L481 AbstractCegarLoop]: Abstraction has 208 states and 209 transitions. [2018-10-24 12:10:24,145 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:10:24,145 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 209 transitions. [2018-10-24 12:10:24,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2018-10-24 12:10:24,146 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:24,146 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:24,146 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:24,146 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:24,147 INFO L82 PathProgramCache]: Analyzing trace with hash -341455177, now seen corresponding path program 32 times [2018-10-24 12:10:24,147 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:24,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:24,147 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:24,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:24,147 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:24,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:25,008 INFO L134 CoverageAnalysis]: Checked inductivity of 3107 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:10:25,009 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:25,009 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:25,009 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:25,009 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:25,009 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:25,009 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 [2018-10-24 12:10:25,016 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:25,016 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:28,171 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-10-24 12:10:28,171 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:28,179 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:28,546 INFO L134 CoverageAnalysis]: Checked inductivity of 3107 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2018-10-24 12:10:28,546 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:29,780 INFO L134 CoverageAnalysis]: Checked inductivity of 3107 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2018-10-24 12:10:29,804 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:29,804 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 73 [2018-10-24 12:10:29,805 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:29,805 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:10:29,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:10:29,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2356, Invalid=2900, Unknown=0, NotChecked=0, Total=5256 [2018-10-24 12:10:29,806 INFO L87 Difference]: Start difference. First operand 208 states and 209 transitions. Second operand 39 states. [2018-10-24 12:10:30,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:30,192 INFO L93 Difference]: Finished difference Result 328 states and 333 transitions. [2018-10-24 12:10:30,192 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-24 12:10:30,192 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 207 [2018-10-24 12:10:30,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:30,194 INFO L225 Difference]: With dead ends: 328 [2018-10-24 12:10:30,194 INFO L226 Difference]: Without dead ends: 222 [2018-10-24 12:10:30,195 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 378 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 365 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2362, Invalid=3040, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:10:30,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-10-24 12:10:30,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 220. [2018-10-24 12:10:30,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2018-10-24 12:10:30,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 221 transitions. [2018-10-24 12:10:30,230 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 221 transitions. Word has length 207 [2018-10-24 12:10:30,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:30,231 INFO L481 AbstractCegarLoop]: Abstraction has 220 states and 221 transitions. [2018-10-24 12:10:30,231 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:10:30,231 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 221 transitions. [2018-10-24 12:10:30,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2018-10-24 12:10:30,232 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:30,232 INFO L375 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:30,232 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:30,233 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:30,233 INFO L82 PathProgramCache]: Analyzing trace with hash -1617730476, now seen corresponding path program 33 times [2018-10-24 12:10:30,233 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:30,234 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:30,234 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:30,234 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:30,234 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:30,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:31,256 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:10:31,256 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:31,256 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:31,257 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:31,257 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:31,257 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:31,257 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 [2018-10-24 12:10:31,264 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:31,264 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:31,427 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:31,427 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:31,432 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:31,509 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:10:31,509 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:32,993 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:10:33,015 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:33,015 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-10-24 12:10:33,015 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:33,015 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:10:33,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:10:33,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-24 12:10:33,016 INFO L87 Difference]: Start difference. First operand 220 states and 221 transitions. Second operand 38 states. [2018-10-24 12:10:35,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:35,412 INFO L93 Difference]: Finished difference Result 339 states and 342 transitions. [2018-10-24 12:10:35,413 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-24 12:10:35,413 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 219 [2018-10-24 12:10:35,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:35,414 INFO L225 Difference]: With dead ends: 339 [2018-10-24 12:10:35,414 INFO L226 Difference]: Without dead ends: 229 [2018-10-24 12:10:35,415 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 403 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-24 12:10:35,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2018-10-24 12:10:35,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 223. [2018-10-24 12:10:35,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2018-10-24 12:10:35,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 224 transitions. [2018-10-24 12:10:35,440 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 224 transitions. Word has length 219 [2018-10-24 12:10:35,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:35,440 INFO L481 AbstractCegarLoop]: Abstraction has 223 states and 224 transitions. [2018-10-24 12:10:35,440 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:10:35,440 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 224 transitions. [2018-10-24 12:10:35,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-10-24 12:10:35,441 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:35,441 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:35,441 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:35,442 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:35,442 INFO L82 PathProgramCache]: Analyzing trace with hash 1207553711, now seen corresponding path program 34 times [2018-10-24 12:10:35,442 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:35,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:35,442 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:35,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:35,443 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:35,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:36,512 INFO L134 CoverageAnalysis]: Checked inductivity of 3606 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:10:36,512 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:36,512 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:36,512 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:36,513 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:36,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:36,513 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 [2018-10-24 12:10:36,520 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:36,520 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:36,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:36,685 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:36,756 INFO L134 CoverageAnalysis]: Checked inductivity of 3606 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:10:36,757 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:38,355 INFO L134 CoverageAnalysis]: Checked inductivity of 3606 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:10:38,377 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:38,377 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 75 [2018-10-24 12:10:38,377 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:38,378 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:10:38,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:10:38,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-24 12:10:38,379 INFO L87 Difference]: Start difference. First operand 223 states and 224 transitions. Second operand 39 states. [2018-10-24 12:10:38,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:38,797 INFO L93 Difference]: Finished difference Result 346 states and 350 transitions. [2018-10-24 12:10:38,797 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-24 12:10:38,797 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 222 [2018-10-24 12:10:38,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:38,798 INFO L225 Difference]: With dead ends: 346 [2018-10-24 12:10:38,798 INFO L226 Difference]: Without dead ends: 236 [2018-10-24 12:10:38,799 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 408 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-24 12:10:38,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2018-10-24 12:10:38,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 226. [2018-10-24 12:10:38,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2018-10-24 12:10:38,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 227 transitions. [2018-10-24 12:10:38,825 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 227 transitions. Word has length 222 [2018-10-24 12:10:38,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:38,826 INFO L481 AbstractCegarLoop]: Abstraction has 226 states and 227 transitions. [2018-10-24 12:10:38,826 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:10:38,826 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 227 transitions. [2018-10-24 12:10:38,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2018-10-24 12:10:38,827 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:38,827 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:38,827 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:38,828 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:38,828 INFO L82 PathProgramCache]: Analyzing trace with hash 774668916, now seen corresponding path program 35 times [2018-10-24 12:10:38,828 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:38,828 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:38,829 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:38,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:38,829 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:38,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:39,547 INFO L134 CoverageAnalysis]: Checked inductivity of 3713 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:10:39,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:39,548 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:39,548 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:39,548 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:39,548 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:39,548 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 [2018-10-24 12:10:39,556 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:39,556 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:43,994 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2018-10-24 12:10:43,994 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:44,003 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:44,123 INFO L134 CoverageAnalysis]: Checked inductivity of 3713 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1962 trivial. 0 not checked. [2018-10-24 12:10:44,123 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:45,570 INFO L134 CoverageAnalysis]: Checked inductivity of 3713 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1962 trivial. 0 not checked. [2018-10-24 12:10:45,596 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:45,596 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 79 [2018-10-24 12:10:45,596 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:45,597 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:10:45,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:10:45,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2785, Invalid=3377, Unknown=0, NotChecked=0, Total=6162 [2018-10-24 12:10:45,598 INFO L87 Difference]: Start difference. First operand 226 states and 227 transitions. Second operand 42 states. [2018-10-24 12:10:46,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:46,008 INFO L93 Difference]: Finished difference Result 355 states and 360 transitions. [2018-10-24 12:10:46,008 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:10:46,008 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 225 [2018-10-24 12:10:46,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:46,010 INFO L225 Difference]: With dead ends: 355 [2018-10-24 12:10:46,010 INFO L226 Difference]: Without dead ends: 240 [2018-10-24 12:10:46,011 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 411 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 398 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2791, Invalid=3529, Unknown=0, NotChecked=0, Total=6320 [2018-10-24 12:10:46,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2018-10-24 12:10:46,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 238. [2018-10-24 12:10:46,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2018-10-24 12:10:46,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 239 transitions. [2018-10-24 12:10:46,040 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 239 transitions. Word has length 225 [2018-10-24 12:10:46,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:46,040 INFO L481 AbstractCegarLoop]: Abstraction has 238 states and 239 transitions. [2018-10-24 12:10:46,040 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:10:46,040 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 239 transitions. [2018-10-24 12:10:46,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2018-10-24 12:10:46,041 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:46,041 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:46,042 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:46,042 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:46,042 INFO L82 PathProgramCache]: Analyzing trace with hash -74539529, now seen corresponding path program 36 times [2018-10-24 12:10:46,042 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:46,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:46,043 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:46,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:46,043 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:46,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:46,915 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:10:46,916 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:46,916 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:46,916 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:46,916 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:46,916 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:46,916 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 [2018-10-24 12:10:46,937 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:46,937 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:47,103 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:47,103 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:47,109 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:47,255 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:10:47,255 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:49,261 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:10:49,282 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:49,282 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2018-10-24 12:10:49,283 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:49,283 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-24 12:10:49,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-24 12:10:49,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-24 12:10:49,284 INFO L87 Difference]: Start difference. First operand 238 states and 239 transitions. Second operand 41 states. [2018-10-24 12:10:50,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:50,199 INFO L93 Difference]: Finished difference Result 366 states and 369 transitions. [2018-10-24 12:10:50,200 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-24 12:10:50,200 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 237 [2018-10-24 12:10:50,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:50,202 INFO L225 Difference]: With dead ends: 366 [2018-10-24 12:10:50,202 INFO L226 Difference]: Without dead ends: 247 [2018-10-24 12:10:50,202 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 [2018-10-24 12:10:50,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-10-24 12:10:50,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 241. [2018-10-24 12:10:50,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2018-10-24 12:10:50,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 242 transitions. [2018-10-24 12:10:50,230 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 242 transitions. Word has length 237 [2018-10-24 12:10:50,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:50,231 INFO L481 AbstractCegarLoop]: Abstraction has 241 states and 242 transitions. [2018-10-24 12:10:50,231 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-24 12:10:50,231 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 242 transitions. [2018-10-24 12:10:50,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2018-10-24 12:10:50,232 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:50,232 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:50,232 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:50,232 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:50,232 INFO L82 PathProgramCache]: Analyzing trace with hash 1048528786, now seen corresponding path program 37 times [2018-10-24 12:10:50,232 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:50,233 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:50,233 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:50,233 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:50,233 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:50,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:52,187 INFO L134 CoverageAnalysis]: Checked inductivity of 4257 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:10:52,187 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:52,187 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:52,187 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:52,187 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:52,187 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:52,187 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 [2018-10-24 12:10:52,195 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:52,195 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:52,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:52,374 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:52,431 INFO L134 CoverageAnalysis]: Checked inductivity of 4257 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:10:52,431 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:54,822 INFO L134 CoverageAnalysis]: Checked inductivity of 4257 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:10:54,843 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:54,844 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-10-24 12:10:54,844 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:54,844 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:10:54,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:10:54,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3240, Invalid=3240, Unknown=0, NotChecked=0, Total=6480 [2018-10-24 12:10:54,845 INFO L87 Difference]: Start difference. First operand 241 states and 242 transitions. Second operand 42 states. [2018-10-24 12:10:55,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:55,304 INFO L93 Difference]: Finished difference Result 373 states and 377 transitions. [2018-10-24 12:10:55,305 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:10:55,305 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 240 [2018-10-24 12:10:55,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:55,306 INFO L225 Difference]: With dead ends: 373 [2018-10-24 12:10:55,306 INFO L226 Difference]: Without dead ends: 254 [2018-10-24 12:10:55,307 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 520 GetRequests, 441 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3240, Invalid=3240, Unknown=0, NotChecked=0, Total=6480 [2018-10-24 12:10:55,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2018-10-24 12:10:55,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 244. [2018-10-24 12:10:55,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2018-10-24 12:10:55,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 245 transitions. [2018-10-24 12:10:55,347 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 245 transitions. Word has length 240 [2018-10-24 12:10:55,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:55,348 INFO L481 AbstractCegarLoop]: Abstraction has 244 states and 245 transitions. [2018-10-24 12:10:55,348 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:10:55,348 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 245 transitions. [2018-10-24 12:10:55,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2018-10-24 12:10:55,349 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:55,349 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:55,349 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:55,349 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:55,349 INFO L82 PathProgramCache]: Analyzing trace with hash 581465111, now seen corresponding path program 38 times [2018-10-24 12:10:55,349 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:55,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:55,350 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:55,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:55,350 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:55,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:56,237 INFO L134 CoverageAnalysis]: Checked inductivity of 4373 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:10:56,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:56,237 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:56,237 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:56,237 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:56,238 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:56,238 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 [2018-10-24 12:10:56,247 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:56,248 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:11:02,718 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-10-24 12:11:02,718 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:02,726 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:02,826 INFO L134 CoverageAnalysis]: Checked inductivity of 4373 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2301 trivial. 0 not checked. [2018-10-24 12:11:02,827 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:04,522 INFO L134 CoverageAnalysis]: Checked inductivity of 4373 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2301 trivial. 0 not checked. [2018-10-24 12:11:04,548 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:04,549 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 85 [2018-10-24 12:11:04,549 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:04,549 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:11:04,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:11:04,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3250, Invalid=3890, Unknown=0, NotChecked=0, Total=7140 [2018-10-24 12:11:04,550 INFO L87 Difference]: Start difference. First operand 244 states and 245 transitions. Second operand 45 states. [2018-10-24 12:11:05,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:05,040 INFO L93 Difference]: Finished difference Result 382 states and 387 transitions. [2018-10-24 12:11:05,040 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-24 12:11:05,040 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 243 [2018-10-24 12:11:05,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:05,042 INFO L225 Difference]: With dead ends: 382 [2018-10-24 12:11:05,042 INFO L226 Difference]: Without dead ends: 258 [2018-10-24 12:11:05,044 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 444 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3256, Invalid=4054, Unknown=0, NotChecked=0, Total=7310 [2018-10-24 12:11:05,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2018-10-24 12:11:05,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 256. [2018-10-24 12:11:05,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2018-10-24 12:11:05,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 257 transitions. [2018-10-24 12:11:05,089 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 257 transitions. Word has length 243 [2018-10-24 12:11:05,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:05,089 INFO L481 AbstractCegarLoop]: Abstraction has 256 states and 257 transitions. [2018-10-24 12:11:05,089 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:11:05,090 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 257 transitions. [2018-10-24 12:11:05,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2018-10-24 12:11:05,091 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:05,091 INFO L375 BasicCegarLoop]: trace histogram [41, 41, 40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:05,091 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:05,092 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:05,092 INFO L82 PathProgramCache]: Analyzing trace with hash -1711526796, now seen corresponding path program 39 times [2018-10-24 12:11:05,092 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:05,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:05,093 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:05,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:05,093 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:05,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:06,641 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:11:06,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:06,642 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:06,642 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:06,642 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:06,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:06,642 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 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 [2018-10-24 12:11:06,650 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:11:06,650 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:11:06,837 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:11:06,837 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:06,843 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:06,927 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:11:06,927 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:08,871 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:11:08,893 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:08,893 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 85 [2018-10-24 12:11:08,893 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:08,893 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-24 12:11:08,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-24 12:11:08,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3570, Invalid=3570, Unknown=0, NotChecked=0, Total=7140 [2018-10-24 12:11:08,894 INFO L87 Difference]: Start difference. First operand 256 states and 257 transitions. Second operand 44 states. [2018-10-24 12:11:09,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:09,388 INFO L93 Difference]: Finished difference Result 393 states and 396 transitions. [2018-10-24 12:11:09,388 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:11:09,388 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 255 [2018-10-24 12:11:09,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:09,390 INFO L225 Difference]: With dead ends: 393 [2018-10-24 12:11:09,390 INFO L226 Difference]: Without dead ends: 265 [2018-10-24 12:11:09,391 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 552 GetRequests, 469 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3570, Invalid=3570, Unknown=0, NotChecked=0, Total=7140 [2018-10-24 12:11:09,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2018-10-24 12:11:09,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 259. [2018-10-24 12:11:09,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2018-10-24 12:11:09,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 260 transitions. [2018-10-24 12:11:09,435 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 260 transitions. Word has length 255 [2018-10-24 12:11:09,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:09,436 INFO L481 AbstractCegarLoop]: Abstraction has 259 states and 260 transitions. [2018-10-24 12:11:09,436 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-24 12:11:09,436 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 260 transitions. [2018-10-24 12:11:09,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-10-24 12:11:09,437 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:09,438 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:09,438 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:09,438 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:09,438 INFO L82 PathProgramCache]: Analyzing trace with hash 27116879, now seen corresponding path program 40 times [2018-10-24 12:11:09,438 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:09,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:09,441 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:09,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:09,441 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:09,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:10,342 INFO L134 CoverageAnalysis]: Checked inductivity of 4962 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:11:10,342 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:10,342 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:10,343 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:10,343 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:10,343 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:10,343 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 [2018-10-24 12:11:10,351 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:10,351 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:11:10,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:10,536 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:10,625 INFO L134 CoverageAnalysis]: Checked inductivity of 4962 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:11:10,625 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:12,914 INFO L134 CoverageAnalysis]: Checked inductivity of 4962 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:11:12,936 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:12,936 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2018-10-24 12:11:12,936 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:12,937 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:11:12,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:11:12,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3741, Invalid=3741, Unknown=0, NotChecked=0, Total=7482 [2018-10-24 12:11:12,938 INFO L87 Difference]: Start difference. First operand 259 states and 260 transitions. Second operand 45 states. [2018-10-24 12:11:13,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:13,439 INFO L93 Difference]: Finished difference Result 400 states and 404 transitions. [2018-10-24 12:11:13,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-24 12:11:13,439 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 258 [2018-10-24 12:11:13,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:13,440 INFO L225 Difference]: With dead ends: 400 [2018-10-24 12:11:13,440 INFO L226 Difference]: Without dead ends: 272 [2018-10-24 12:11:13,441 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 559 GetRequests, 474 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3741, Invalid=3741, Unknown=0, NotChecked=0, Total=7482 [2018-10-24 12:11:13,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2018-10-24 12:11:13,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 262. [2018-10-24 12:11:13,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 262 states. [2018-10-24 12:11:13,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 263 transitions. [2018-10-24 12:11:13,474 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 263 transitions. Word has length 258 [2018-10-24 12:11:13,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:13,474 INFO L481 AbstractCegarLoop]: Abstraction has 262 states and 263 transitions. [2018-10-24 12:11:13,474 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:11:13,474 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 263 transitions. [2018-10-24 12:11:13,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2018-10-24 12:11:13,476 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:13,476 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:13,476 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:13,476 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:13,477 INFO L82 PathProgramCache]: Analyzing trace with hash -1344750956, now seen corresponding path program 41 times [2018-10-24 12:11:13,477 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:13,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:13,478 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:13,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:13,478 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:13,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:14,426 INFO L134 CoverageAnalysis]: Checked inductivity of 5087 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:11:14,426 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:14,427 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:14,427 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:14,427 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:14,427 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:14,427 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 [2018-10-24 12:11:14,434 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:14,434 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:11:23,297 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-10-24 12:11:23,297 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:23,307 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:23,524 INFO L134 CoverageAnalysis]: Checked inductivity of 5087 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2667 trivial. 0 not checked. [2018-10-24 12:11:23,525 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:25,555 INFO L134 CoverageAnalysis]: Checked inductivity of 5087 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2667 trivial. 0 not checked. [2018-10-24 12:11:25,580 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:25,581 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 91 [2018-10-24 12:11:25,581 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:25,581 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-24 12:11:25,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-24 12:11:25,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3751, Invalid=4439, Unknown=0, NotChecked=0, Total=8190 [2018-10-24 12:11:25,583 INFO L87 Difference]: Start difference. First operand 262 states and 263 transitions. Second operand 48 states. [2018-10-24 12:11:26,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:26,138 INFO L93 Difference]: Finished difference Result 409 states and 414 transitions. [2018-10-24 12:11:26,138 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:11:26,138 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 261 [2018-10-24 12:11:26,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:26,140 INFO L225 Difference]: With dead ends: 409 [2018-10-24 12:11:26,140 INFO L226 Difference]: Without dead ends: 276 [2018-10-24 12:11:26,141 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 567 GetRequests, 477 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=3757, Invalid=4615, Unknown=0, NotChecked=0, Total=8372 [2018-10-24 12:11:26,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2018-10-24 12:11:26,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 274. [2018-10-24 12:11:26,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2018-10-24 12:11:26,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 275 transitions. [2018-10-24 12:11:26,190 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 275 transitions. Word has length 261 [2018-10-24 12:11:26,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:26,190 INFO L481 AbstractCegarLoop]: Abstraction has 274 states and 275 transitions. [2018-10-24 12:11:26,190 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-24 12:11:26,190 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 275 transitions. [2018-10-24 12:11:26,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2018-10-24 12:11:26,192 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:26,192 INFO L375 BasicCegarLoop]: trace histogram [44, 44, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:26,192 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:26,192 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:26,193 INFO L82 PathProgramCache]: Analyzing trace with hash -1216246953, now seen corresponding path program 42 times [2018-10-24 12:11:26,193 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:26,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:26,193 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:26,194 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:26,194 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:26,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:27,766 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:11:27,766 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:27,766 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:27,766 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:27,766 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:27,766 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:27,766 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 [2018-10-24 12:11:27,774 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:11:27,775 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:11:27,983 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:11:27,983 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:27,989 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:28,052 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:11:28,052 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:30,084 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:11:30,105 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:30,106 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 91 [2018-10-24 12:11:30,106 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:30,106 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-24 12:11:30,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-24 12:11:30,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4095, Invalid=4095, Unknown=0, NotChecked=0, Total=8190 [2018-10-24 12:11:30,108 INFO L87 Difference]: Start difference. First operand 274 states and 275 transitions. Second operand 47 states. [2018-10-24 12:11:30,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:30,786 INFO L93 Difference]: Finished difference Result 420 states and 423 transitions. [2018-10-24 12:11:30,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-24 12:11:30,787 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 273 [2018-10-24 12:11:30,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:30,788 INFO L225 Difference]: With dead ends: 420 [2018-10-24 12:11:30,788 INFO L226 Difference]: Without dead ends: 283 [2018-10-24 12:11:30,789 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=4095, Invalid=4095, Unknown=0, NotChecked=0, Total=8190 [2018-10-24 12:11:30,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2018-10-24 12:11:30,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 277. [2018-10-24 12:11:30,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 277 states. [2018-10-24 12:11:30,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 278 transitions. [2018-10-24 12:11:30,837 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 278 transitions. Word has length 273 [2018-10-24 12:11:30,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:30,837 INFO L481 AbstractCegarLoop]: Abstraction has 277 states and 278 transitions. [2018-10-24 12:11:30,837 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-24 12:11:30,838 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 278 transitions. [2018-10-24 12:11:30,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2018-10-24 12:11:30,839 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:30,839 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:30,839 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:30,840 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:30,840 INFO L82 PathProgramCache]: Analyzing trace with hash -206650510, now seen corresponding path program 43 times [2018-10-24 12:11:30,840 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:30,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:30,841 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:30,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:30,841 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:30,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:31,907 INFO L134 CoverageAnalysis]: Checked inductivity of 5721 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:11:31,908 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:31,908 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:31,908 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:31,908 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:31,908 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:31,908 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 [2018-10-24 12:11:31,917 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:31,917 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:11:32,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:32,122 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:32,185 INFO L134 CoverageAnalysis]: Checked inductivity of 5721 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:11:32,185 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:34,538 INFO L134 CoverageAnalysis]: Checked inductivity of 5721 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:11:34,559 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:34,560 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-10-24 12:11:34,560 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:34,560 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-24 12:11:34,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-24 12:11:34,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4278, Invalid=4278, Unknown=0, NotChecked=0, Total=8556 [2018-10-24 12:11:34,561 INFO L87 Difference]: Start difference. First operand 277 states and 278 transitions. Second operand 48 states. [2018-10-24 12:11:35,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:35,161 INFO L93 Difference]: Finished difference Result 427 states and 431 transitions. [2018-10-24 12:11:35,161 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:11:35,161 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 276 [2018-10-24 12:11:35,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:35,163 INFO L225 Difference]: With dead ends: 427 [2018-10-24 12:11:35,163 INFO L226 Difference]: Without dead ends: 290 [2018-10-24 12:11:35,164 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 598 GetRequests, 507 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=4278, Invalid=4278, Unknown=0, NotChecked=0, Total=8556 [2018-10-24 12:11:35,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2018-10-24 12:11:35,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 280. [2018-10-24 12:11:35,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2018-10-24 12:11:35,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 281 transitions. [2018-10-24 12:11:35,205 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 281 transitions. Word has length 276 [2018-10-24 12:11:35,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:35,205 INFO L481 AbstractCegarLoop]: Abstraction has 280 states and 281 transitions. [2018-10-24 12:11:35,205 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-24 12:11:35,205 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 281 transitions. [2018-10-24 12:11:35,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 280 [2018-10-24 12:11:35,207 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:35,207 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:35,207 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:35,207 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:35,207 INFO L82 PathProgramCache]: Analyzing trace with hash -974990985, now seen corresponding path program 44 times [2018-10-24 12:11:35,208 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:35,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:35,208 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:35,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:35,209 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:35,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:36,400 INFO L134 CoverageAnalysis]: Checked inductivity of 5855 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:11:36,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:36,400 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:36,400 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:36,400 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:36,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:36,400 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 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 [2018-10-24 12:11:36,407 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:36,407 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:12:04,495 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 44 check-sat command(s) [2018-10-24 12:12:04,495 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:12:04,510 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:04,618 INFO L134 CoverageAnalysis]: Checked inductivity of 5855 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 3060 trivial. 0 not checked. [2018-10-24 12:12:04,619 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:06,925 INFO L134 CoverageAnalysis]: Checked inductivity of 5855 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 3060 trivial. 0 not checked. [2018-10-24 12:12:06,952 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:06,952 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 97 [2018-10-24 12:12:06,953 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:06,953 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-24 12:12:06,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-24 12:12:06,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4288, Invalid=5024, Unknown=0, NotChecked=0, Total=9312 [2018-10-24 12:12:06,954 INFO L87 Difference]: Start difference. First operand 280 states and 281 transitions. Second operand 51 states. [2018-10-24 12:12:07,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:07,585 INFO L93 Difference]: Finished difference Result 436 states and 441 transitions. [2018-10-24 12:12:07,586 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-24 12:12:07,586 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 279 [2018-10-24 12:12:07,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:07,588 INFO L225 Difference]: With dead ends: 436 [2018-10-24 12:12:07,588 INFO L226 Difference]: Without dead ends: 294 [2018-10-24 12:12:07,589 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 606 GetRequests, 510 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 497 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=4294, Invalid=5212, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:12:07,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2018-10-24 12:12:07,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 292. [2018-10-24 12:12:07,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2018-10-24 12:12:07,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 293 transitions. [2018-10-24 12:12:07,636 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 293 transitions. Word has length 279 [2018-10-24 12:12:07,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:07,636 INFO L481 AbstractCegarLoop]: Abstraction has 292 states and 293 transitions. [2018-10-24 12:12:07,636 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-24 12:12:07,637 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 293 transitions. [2018-10-24 12:12:07,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2018-10-24 12:12:07,638 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:07,638 INFO L375 BasicCegarLoop]: trace histogram [47, 47, 46, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:07,638 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:07,638 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:07,638 INFO L82 PathProgramCache]: Analyzing trace with hash -622232428, now seen corresponding path program 45 times [2018-10-24 12:12:07,638 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:07,639 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:07,639 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:12:07,639 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:07,639 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:07,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:08,748 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-24 12:12:08,748 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:08,748 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:08,748 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:08,749 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:08,749 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:08,749 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 [2018-10-24 12:12:08,758 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:12:08,758 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:12:08,973 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:12:08,973 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:12:08,980 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:09,041 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-24 12:12:09,041 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:11,359 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-24 12:12:11,382 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:11,383 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2018-10-24 12:12:11,383 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:11,383 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-24 12:12:11,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-24 12:12:11,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4656, Invalid=4656, Unknown=0, NotChecked=0, Total=9312 [2018-10-24 12:12:11,384 INFO L87 Difference]: Start difference. First operand 292 states and 293 transitions. Second operand 50 states. [2018-10-24 12:12:12,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:12,105 INFO L93 Difference]: Finished difference Result 447 states and 450 transitions. [2018-10-24 12:12:12,105 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-24 12:12:12,105 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 291 [2018-10-24 12:12:12,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:12,107 INFO L225 Difference]: With dead ends: 447 [2018-10-24 12:12:12,107 INFO L226 Difference]: Without dead ends: 301 [2018-10-24 12:12:12,108 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 630 GetRequests, 535 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=4656, Invalid=4656, Unknown=0, NotChecked=0, Total=9312 [2018-10-24 12:12:12,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2018-10-24 12:12:12,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 295. [2018-10-24 12:12:12,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 295 states. [2018-10-24 12:12:12,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 296 transitions. [2018-10-24 12:12:12,165 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 296 transitions. Word has length 291 [2018-10-24 12:12:12,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:12,165 INFO L481 AbstractCegarLoop]: Abstraction has 295 states and 296 transitions. [2018-10-24 12:12:12,165 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-24 12:12:12,166 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 296 transitions. [2018-10-24 12:12:12,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2018-10-24 12:12:12,167 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:12,167 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:12,168 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:12,168 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:12,168 INFO L82 PathProgramCache]: Analyzing trace with hash 1009845231, now seen corresponding path program 46 times [2018-10-24 12:12:12,168 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:12,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:12,169 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:12:12,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:12,169 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:12,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:13,410 INFO L134 CoverageAnalysis]: Checked inductivity of 6534 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-24 12:12:13,410 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:13,410 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:13,411 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:13,411 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:13,411 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:13,411 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 [2018-10-24 12:12:13,418 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:12:13,419 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:12:13,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:13,639 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:13,705 INFO L134 CoverageAnalysis]: Checked inductivity of 6534 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-24 12:12:13,705 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:16,427 INFO L134 CoverageAnalysis]: Checked inductivity of 6534 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-24 12:12:16,449 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:16,449 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 99 [2018-10-24 12:12:16,449 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:16,450 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-24 12:12:16,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-24 12:12:16,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4851, Invalid=4851, Unknown=0, NotChecked=0, Total=9702 [2018-10-24 12:12:16,451 INFO L87 Difference]: Start difference. First operand 295 states and 296 transitions. Second operand 51 states. [2018-10-24 12:12:17,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:17,285 INFO L93 Difference]: Finished difference Result 454 states and 458 transitions. [2018-10-24 12:12:17,287 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-24 12:12:17,288 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 294 [2018-10-24 12:12:17,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:17,289 INFO L225 Difference]: With dead ends: 454 [2018-10-24 12:12:17,289 INFO L226 Difference]: Without dead ends: 308 [2018-10-24 12:12:17,290 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 637 GetRequests, 540 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=4851, Invalid=4851, Unknown=0, NotChecked=0, Total=9702 [2018-10-24 12:12:17,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2018-10-24 12:12:17,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 298. [2018-10-24 12:12:17,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 298 states. [2018-10-24 12:12:17,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 299 transitions. [2018-10-24 12:12:17,336 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 299 transitions. Word has length 294 [2018-10-24 12:12:17,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:17,336 INFO L481 AbstractCegarLoop]: Abstraction has 298 states and 299 transitions. [2018-10-24 12:12:17,337 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-24 12:12:17,337 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 299 transitions. [2018-10-24 12:12:17,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2018-10-24 12:12:17,338 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:17,339 INFO L375 BasicCegarLoop]: trace histogram [49, 48, 48, 47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:17,339 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:17,339 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:17,339 INFO L82 PathProgramCache]: Analyzing trace with hash -1089373516, now seen corresponding path program 47 times [2018-10-24 12:12:17,339 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:17,340 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:17,340 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:12:17,340 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:17,340 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:17,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:18,388 INFO L134 CoverageAnalysis]: Checked inductivity of 6677 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-24 12:12:18,389 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:18,389 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:18,389 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:18,389 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:18,389 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:18,389 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 [2018-10-24 12:12:18,397 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:12:18,397 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:12:35,839 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2018-10-24 12:12:35,840 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:12:35,857 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:35,976 INFO L134 CoverageAnalysis]: Checked inductivity of 6677 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3480 trivial. 0 not checked. [2018-10-24 12:12:35,976 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:38,575 INFO L134 CoverageAnalysis]: Checked inductivity of 6677 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3480 trivial. 0 not checked. [2018-10-24 12:12:38,602 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:38,602 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 103 [2018-10-24 12:12:38,603 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:38,603 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-24 12:12:38,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-24 12:12:38,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4861, Invalid=5645, Unknown=0, NotChecked=0, Total=10506 [2018-10-24 12:12:38,604 INFO L87 Difference]: Start difference. First operand 298 states and 299 transitions. Second operand 54 states. [2018-10-24 12:12:39,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:39,391 INFO L93 Difference]: Finished difference Result 463 states and 468 transitions. [2018-10-24 12:12:39,392 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-24 12:12:39,392 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 297 [2018-10-24 12:12:39,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:39,393 INFO L225 Difference]: With dead ends: 463 [2018-10-24 12:12:39,393 INFO L226 Difference]: Without dead ends: 312 [2018-10-24 12:12:39,395 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 [2018-10-24 12:12:39,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2018-10-24 12:12:39,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 310. [2018-10-24 12:12:39,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 310 states. [2018-10-24 12:12:39,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 311 transitions. [2018-10-24 12:12:39,435 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 311 transitions. Word has length 297 [2018-10-24 12:12:39,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:39,435 INFO L481 AbstractCegarLoop]: Abstraction has 310 states and 311 transitions. [2018-10-24 12:12:39,435 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-24 12:12:39,435 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 311 transitions. [2018-10-24 12:12:39,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2018-10-24 12:12:39,437 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:39,437 INFO L375 BasicCegarLoop]: trace histogram [50, 50, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:39,438 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:39,438 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:39,438 INFO L82 PathProgramCache]: Analyzing trace with hash 842936503, now seen corresponding path program 48 times [2018-10-24 12:12:39,438 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:39,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:39,439 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:12:39,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:39,439 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:39,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:40,599 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-24 12:12:40,600 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:40,600 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:40,600 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:40,600 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:40,600 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:40,600 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 [2018-10-24 12:12:40,609 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:12:40,609 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:12:40,839 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:12:40,839 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:12:40,845 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:40,920 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-24 12:12:40,921 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:43,621 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-24 12:12:43,643 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:43,643 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 103 [2018-10-24 12:12:43,643 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:43,643 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-24 12:12:43,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-24 12:12:43,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5253, Invalid=5253, Unknown=0, NotChecked=0, Total=10506 [2018-10-24 12:12:43,645 INFO L87 Difference]: Start difference. First operand 310 states and 311 transitions. Second operand 53 states. [2018-10-24 12:12:44,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:44,432 INFO L93 Difference]: Finished difference Result 474 states and 477 transitions. [2018-10-24 12:12:44,432 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-24 12:12:44,432 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 309 [2018-10-24 12:12:44,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:44,434 INFO L225 Difference]: With dead ends: 474 [2018-10-24 12:12:44,434 INFO L226 Difference]: Without dead ends: 319 [2018-10-24 12:12:44,436 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 669 GetRequests, 568 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=5253, Invalid=5253, Unknown=0, NotChecked=0, Total=10506 [2018-10-24 12:12:44,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2018-10-24 12:12:44,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 313. [2018-10-24 12:12:44,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 313 states. [2018-10-24 12:12:44,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 314 transitions. [2018-10-24 12:12:44,480 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 314 transitions. Word has length 309 [2018-10-24 12:12:44,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:44,480 INFO L481 AbstractCegarLoop]: Abstraction has 313 states and 314 transitions. [2018-10-24 12:12:44,480 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-24 12:12:44,480 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 314 transitions. [2018-10-24 12:12:44,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 313 [2018-10-24 12:12:44,482 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:44,482 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 50, 50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:44,483 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:44,483 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:44,483 INFO L82 PathProgramCache]: Analyzing trace with hash 1692579666, now seen corresponding path program 49 times [2018-10-24 12:12:44,483 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:44,484 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:44,484 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:12:44,484 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:44,484 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:44,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:45,646 INFO L134 CoverageAnalysis]: Checked inductivity of 7401 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-24 12:12:45,646 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:45,647 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:45,647 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:45,647 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:45,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:45,647 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 [2018-10-24 12:12:45,655 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:12:45,655 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:12:45,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:45,888 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:45,981 INFO L134 CoverageAnalysis]: Checked inductivity of 7401 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-24 12:12:45,981 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:48,793 INFO L134 CoverageAnalysis]: Checked inductivity of 7401 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-24 12:12:48,816 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:48,816 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 105 [2018-10-24 12:12:48,816 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:48,817 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-24 12:12:48,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-24 12:12:48,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5460, Invalid=5460, Unknown=0, NotChecked=0, Total=10920 [2018-10-24 12:12:48,818 INFO L87 Difference]: Start difference. First operand 313 states and 314 transitions. Second operand 54 states. [2018-10-24 12:12:49,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:49,631 INFO L93 Difference]: Finished difference Result 481 states and 485 transitions. [2018-10-24 12:12:49,632 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-24 12:12:49,632 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 312 [2018-10-24 12:12:49,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:49,634 INFO L225 Difference]: With dead ends: 481 [2018-10-24 12:12:49,634 INFO L226 Difference]: Without dead ends: 326 [2018-10-24 12:12:49,635 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 [2018-10-24 12:12:49,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2018-10-24 12:12:49,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 316. [2018-10-24 12:12:49,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2018-10-24 12:12:49,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 317 transitions. [2018-10-24 12:12:49,684 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 317 transitions. Word has length 312 [2018-10-24 12:12:49,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:49,684 INFO L481 AbstractCegarLoop]: Abstraction has 316 states and 317 transitions. [2018-10-24 12:12:49,684 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-24 12:12:49,684 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 317 transitions. [2018-10-24 12:12:49,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 316 [2018-10-24 12:12:49,686 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:49,686 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 51, 50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:49,686 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:49,686 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:49,687 INFO L82 PathProgramCache]: Analyzing trace with hash -1125194025, now seen corresponding path program 50 times [2018-10-24 12:12:49,687 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:49,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:49,687 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:12:49,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:49,688 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:49,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:50,957 INFO L134 CoverageAnalysis]: Checked inductivity of 7553 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-24 12:12:50,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:50,958 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:50,958 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:50,958 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:50,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:50,958 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 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 [2018-10-24 12:12:50,966 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:12:50,966 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:13:10,528 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2018-10-24 12:13:10,529 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:13:10,548 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:10,676 INFO L134 CoverageAnalysis]: Checked inductivity of 7553 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3927 trivial. 0 not checked. [2018-10-24 12:13:10,677 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:13,599 INFO L134 CoverageAnalysis]: Checked inductivity of 7553 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3927 trivial. 0 not checked. [2018-10-24 12:13:13,627 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:13,627 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 109 [2018-10-24 12:13:13,628 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:13,628 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-24 12:13:13,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-24 12:13:13,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5470, Invalid=6302, Unknown=0, NotChecked=0, Total=11772 [2018-10-24 12:13:13,629 INFO L87 Difference]: Start difference. First operand 316 states and 317 transitions. Second operand 57 states. [2018-10-24 12:13:14,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:14,328 INFO L93 Difference]: Finished difference Result 490 states and 495 transitions. [2018-10-24 12:13:14,328 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-24 12:13:14,328 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 315 [2018-10-24 12:13:14,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:14,330 INFO L225 Difference]: With dead ends: 490 [2018-10-24 12:13:14,330 INFO L226 Difference]: Without dead ends: 330 [2018-10-24 12:13:14,332 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 684 GetRequests, 576 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 563 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=5476, Invalid=6514, Unknown=0, NotChecked=0, Total=11990 [2018-10-24 12:13:14,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2018-10-24 12:13:14,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 328. [2018-10-24 12:13:14,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 328 states. [2018-10-24 12:13:14,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 329 transitions. [2018-10-24 12:13:14,379 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 329 transitions. Word has length 315 [2018-10-24 12:13:14,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:14,380 INFO L481 AbstractCegarLoop]: Abstraction has 328 states and 329 transitions. [2018-10-24 12:13:14,380 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-24 12:13:14,380 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 329 transitions. [2018-10-24 12:13:14,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2018-10-24 12:13:14,382 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:14,382 INFO L375 BasicCegarLoop]: trace histogram [53, 53, 52, 52, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:14,382 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:14,382 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:14,382 INFO L82 PathProgramCache]: Analyzing trace with hash 1516328116, now seen corresponding path program 51 times [2018-10-24 12:13:14,382 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:14,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:14,383 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:13:14,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:14,383 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:14,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:15,895 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-24 12:13:15,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:15,896 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:15,896 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:15,896 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:15,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:15,896 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 [2018-10-24 12:13:15,904 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:13:15,904 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:13:16,145 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:13:16,145 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:13:16,152 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:16,261 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-24 12:13:16,262 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:19,181 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-24 12:13:19,204 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:19,204 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 109 [2018-10-24 12:13:19,205 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:19,205 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-10-24 12:13:19,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-10-24 12:13:19,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5886, Invalid=5886, Unknown=0, NotChecked=0, Total=11772 [2018-10-24 12:13:19,206 INFO L87 Difference]: Start difference. First operand 328 states and 329 transitions. Second operand 56 states. Received shutdown request... [2018-10-24 12:13:19,930 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-24 12:13:19,931 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-24 12:13:19,935 WARN L205 ceAbstractionStarter]: Timeout [2018-10-24 12:13:19,936 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:13:19 BoogieIcfgContainer [2018-10-24 12:13:19,936 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:13:19,937 INFO L168 Benchmark]: Toolchain (without parser) took 240042.08 ms. Allocated memory was 1.5 GB in the beginning and 2.7 GB in the end (delta: 1.2 GB). Free memory was 1.4 GB in the beginning and 1.6 GB in the end (delta: -178.4 MB). Peak memory consumption was 972.9 MB. Max. memory is 7.1 GB. [2018-10-24 12:13:19,938 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:13:19,938 INFO L168 Benchmark]: CACSL2BoogieTranslator took 249.80 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:13:19,939 INFO L168 Benchmark]: Boogie Procedure Inliner took 40.75 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:13:19,939 INFO L168 Benchmark]: Boogie Preprocessor took 27.61 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:13:19,940 INFO L168 Benchmark]: RCFGBuilder took 490.50 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 756.5 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -809.3 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. [2018-10-24 12:13:19,940 INFO L168 Benchmark]: TraceAbstraction took 239228.76 ms. Allocated memory was 2.3 GB in the beginning and 2.7 GB in the end (delta: 394.8 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 620.3 MB). Peak memory consumption was 1.0 GB. Max. memory is 7.1 GB. [2018-10-24 12:13:19,944 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 249.80 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 40.75 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 27.61 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 490.50 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 756.5 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -809.3 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 239228.76 ms. Allocated memory was 2.3 GB in the beginning and 2.7 GB in the end (delta: 394.8 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 620.3 MB). Peak memory consumption was 1.0 GB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 4]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 4). Cancelled while BasicCegarLoop was constructing difference of abstraction (328states) and FLOYD_HOARE automaton (currently 55 states, 56 states before enhancement),while ReachableStatesComputation was computing reachable states (440 states constructedinput type IntersectNwa). - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 25 locations, 1 error locations. TIMEOUT Result, 239.1s OverallTime, 54 OverallIterations, 53 TraceHistogramMax, 24.9s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 692 SDtfs, 5375 SDslu, 10150 SDs, 0 SdLazy, 10144 SolverSat, 2025 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 16.1s Time, PredicateUnifierStatistics: 2 DeclaredPredicates, 19267 GetRequests, 16300 SyntacticMatches, 0 SemanticMatches, 2967 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8772 ImplicationChecksByTransitivity, 102.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=328occurred in iteration=53, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 1.3s AbstIntTime, 2 AbstIntIterations, 1 AbstIntStrong, 0.942156862745098 AbsIntWeakeningRatio, 1.411764705882353 AbsIntAvgWeakeningVarsNumRemoved, 99.88235294117646 AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 1.2s AutomataMinimizationTime, 53 MinimizatonAttempts, 309 StatesRemovedByMinimization, 52 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 1.6s SsaConstructionTime, 97.5s SatisfiabilityAnalysisTime, 108.6s InterpolantComputationTime, 17794 NumberOfCodeBlocks, 17692 NumberOfCodeBlocksAsserted, 547 NumberOfCheckSat, 26512 ConstructedInterpolants, 0 QuantifiedInterpolants, 11335418 SizeOfPredicates, 71 NumberOfNonLiveVariables, 43520 ConjunctsInSsa, 1534 ConjunctsInUnsatCore, 156 InterpolantComputations, 2 PerfectInterpolantSequences, 212500/426260 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown