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-EXP.epf -i ../../../trunk/examples/svcomp/loop-invgen/seq_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:34:40,114 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:34:40,116 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:34:40,130 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:34:40,131 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:34:40,132 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:34:40,134 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:34:40,136 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:34:40,139 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:34:40,141 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:34:40,142 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:34:40,142 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:34:40,145 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:34:40,146 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:34:40,147 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:34:40,150 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:34:40,151 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:34:40,153 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:34:40,163 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:34:40,167 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:34:40,168 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:34:40,169 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:34:40,174 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:34:40,174 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:34:40,174 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:34:40,175 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:34:40,180 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:34:40,181 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:34:40,182 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:34:40,183 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:34:40,183 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:34:40,184 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-24 12:34:40,186 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-24 12:34:40,207 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:34:40,207 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:34:40,208 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:34:40,208 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:34:40,208 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:34:40,208 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:34:40,209 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-24 12:34:40,209 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:34:40,209 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-24 12:34:40,209 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:34:40,209 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:34:40,210 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:34:40,210 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:34:40,210 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:34:40,211 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:34:40,211 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:34:40,211 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:34:40,211 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:34:40,211 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:34:40,212 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:34:40,212 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:34:40,212 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:34:40,212 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:34:40,212 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:34:40,213 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:34:40,213 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:34:40,213 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:34:40,213 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:34:40,213 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:34:40,214 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:34:40,214 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:34:40,214 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:34:40,214 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:34:40,214 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:34:40,214 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:34:40,215 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:34:40,257 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:34:40,276 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:34:40,282 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:34:40,283 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:34:40,284 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:34:40,284 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-invgen/seq_true-unreach-call_true-termination.i [2018-10-24 12:34:40,351 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/a4fa4e5d7/a5b501f7a1fc46f18da07d4e5cdddb85/FLAG3cdb001c9 [2018-10-24 12:34:40,827 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:34:40,827 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/seq_true-unreach-call_true-termination.i [2018-10-24 12:34:40,833 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/a4fa4e5d7/a5b501f7a1fc46f18da07d4e5cdddb85/FLAG3cdb001c9 [2018-10-24 12:34:40,849 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/a4fa4e5d7/a5b501f7a1fc46f18da07d4e5cdddb85 [2018-10-24 12:34:40,861 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:34:40,863 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:34:40,864 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:34:40,864 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:34:40,867 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:34:40,868 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:34:40" (1/1) ... [2018-10-24 12:34:40,871 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6209f138 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:40, skipping insertion in model container [2018-10-24 12:34:40,872 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:34:40" (1/1) ... [2018-10-24 12:34:40,882 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:34:40,904 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:34:41,082 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:34:41,086 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:34:41,106 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:34:41,122 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:34:41,123 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:41 WrapperNode [2018-10-24 12:34:41,123 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:34:41,124 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:34:41,124 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:34:41,124 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:34:41,133 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:41" (1/1) ... [2018-10-24 12:34:41,139 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:41" (1/1) ... [2018-10-24 12:34:41,146 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:34:41,146 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:34:41,146 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:34:41,146 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:34:41,157 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:41" (1/1) ... [2018-10-24 12:34:41,157 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:41" (1/1) ... [2018-10-24 12:34:41,158 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:41" (1/1) ... [2018-10-24 12:34:41,158 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:41" (1/1) ... [2018-10-24 12:34:41,162 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:41" (1/1) ... [2018-10-24 12:34:41,169 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:41" (1/1) ... [2018-10-24 12:34:41,171 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:41" (1/1) ... [2018-10-24 12:34:41,180 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:34:41,180 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:34:41,181 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:34:41,181 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:34:41,182 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:41" (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 12:34:41,325 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:34:41,325 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:34:41,326 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:34:41,326 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:34:41,326 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:34:41,326 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:34:41,326 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:34:41,326 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:34:41,692 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:34:41,693 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:34:41 BoogieIcfgContainer [2018-10-24 12:34:41,693 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:34:41,694 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:34:41,694 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:34:41,697 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:34:41,698 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:34:40" (1/3) ... [2018-10-24 12:34:41,698 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7435d7e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:34:41, skipping insertion in model container [2018-10-24 12:34:41,699 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:41" (2/3) ... [2018-10-24 12:34:41,699 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7435d7e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:34:41, skipping insertion in model container [2018-10-24 12:34:41,699 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:34:41" (3/3) ... [2018-10-24 12:34:41,701 INFO L112 eAbstractionObserver]: Analyzing ICFG seq_true-unreach-call_true-termination.i [2018-10-24 12:34:41,712 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:34:41,720 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:34:41,738 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:34:41,773 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:34:41,773 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:34:41,774 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:34:41,774 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:34:41,774 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:34:41,774 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:34:41,774 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:34:41,774 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:34:41,793 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2018-10-24 12:34:41,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 12:34:41,800 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:41,801 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:41,804 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:41,809 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:41,809 INFO L82 PathProgramCache]: Analyzing trace with hash 301890663, now seen corresponding path program 1 times [2018-10-24 12:34:41,811 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:41,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:41,858 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:41,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:41,858 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:41,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:41,927 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 12:34:41,929 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:34:41,929 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:34:41,929 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:34:41,934 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:34:41,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:34:41,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:34:41,953 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2018-10-24 12:34:41,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:41,980 INFO L93 Difference]: Finished difference Result 45 states and 58 transitions. [2018-10-24 12:34:41,980 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:34:41,982 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-10-24 12:34:41,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:41,992 INFO L225 Difference]: With dead ends: 45 [2018-10-24 12:34:41,992 INFO L226 Difference]: Without dead ends: 23 [2018-10-24 12:34:41,996 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 12:34:42,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-10-24 12:34:42,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-10-24 12:34:42,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-24 12:34:42,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2018-10-24 12:34:42,038 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 17 [2018-10-24 12:34:42,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:42,039 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2018-10-24 12:34:42,039 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:34:42,039 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2018-10-24 12:34:42,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-24 12:34:42,040 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:42,040 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:42,040 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:42,042 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:42,043 INFO L82 PathProgramCache]: Analyzing trace with hash 1130037681, now seen corresponding path program 1 times [2018-10-24 12:34:42,043 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:42,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:42,044 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:42,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:42,045 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:42,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:42,246 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 12:34:42,247 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:34:42,247 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2018-10-24 12:34:42,247 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:34:42,249 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:34:42,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:34:42,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:34:42,250 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 7 states. [2018-10-24 12:34:42,618 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2018-10-24 12:34:42,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:42,720 INFO L93 Difference]: Finished difference Result 48 states and 54 transitions. [2018-10-24 12:34:42,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:34:42,721 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-10-24 12:34:42,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:42,724 INFO L225 Difference]: With dead ends: 48 [2018-10-24 12:34:42,724 INFO L226 Difference]: Without dead ends: 35 [2018-10-24 12:34:42,725 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:34:42,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-10-24 12:34:42,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28. [2018-10-24 12:34:42,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-24 12:34:42,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2018-10-24 12:34:42,737 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 19 [2018-10-24 12:34:42,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:42,737 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2018-10-24 12:34:42,737 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:34:42,738 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2018-10-24 12:34:42,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-24 12:34:42,739 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:42,739 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:42,739 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:42,739 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:42,739 INFO L82 PathProgramCache]: Analyzing trace with hash -1499928661, now seen corresponding path program 1 times [2018-10-24 12:34:42,740 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:42,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:42,741 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:42,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:42,741 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:42,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:42,860 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:42,861 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:34:42,863 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-10-24 12:34:42,863 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:34:42,864 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:34:42,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:34:42,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:34:42,864 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 6 states. [2018-10-24 12:34:42,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:42,977 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2018-10-24 12:34:42,978 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:34:42,978 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2018-10-24 12:34:42,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:42,979 INFO L225 Difference]: With dead ends: 42 [2018-10-24 12:34:42,979 INFO L226 Difference]: Without dead ends: 40 [2018-10-24 12:34:42,982 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:34:42,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-24 12:34:42,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 35. [2018-10-24 12:34:42,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-24 12:34:42,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2018-10-24 12:34:42,991 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 21 [2018-10-24 12:34:42,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:42,991 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2018-10-24 12:34:42,991 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:34:42,991 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2018-10-24 12:34:42,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-24 12:34:42,992 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:42,993 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:42,993 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:42,993 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:42,993 INFO L82 PathProgramCache]: Analyzing trace with hash -1355895601, now seen corresponding path program 1 times [2018-10-24 12:34:42,993 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:42,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:42,994 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:42,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:42,995 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:43,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:43,288 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:43,288 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:43,288 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:43,289 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 30 with the following transitions: [2018-10-24 12:34:43,291 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [16], [20], [26], [30], [34], [36], [40], [44], [50], [52], [57], [60], [62], [65], [67], [68], [69], [70], [72], [73] [2018-10-24 12:34:43,323 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:34:43,324 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:34:43,587 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:34:43,588 INFO L272 AbstractInterpreter]: Visited 24 different actions 84 times. Merged at 8 different actions 28 times. Widened at 1 different actions 3 times. Found 4 fixpoints after 3 different actions. Largest state had 12 variables. [2018-10-24 12:34:43,607 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:43,608 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:34:43,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:43,608 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 12:34:43,619 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:43,619 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:43,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:43,648 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:44,055 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:44,056 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:44,295 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:44,318 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:44,319 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2018-10-24 12:34:44,319 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:44,319 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:34:44,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:34:44,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:34:44,321 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand 14 states. [2018-10-24 12:34:44,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:44,694 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2018-10-24 12:34:44,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:34:44,695 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 29 [2018-10-24 12:34:44,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:44,699 INFO L225 Difference]: With dead ends: 64 [2018-10-24 12:34:44,700 INFO L226 Difference]: Without dead ends: 47 [2018-10-24 12:34:44,700 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 48 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=275, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:34:44,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-10-24 12:34:44,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 37. [2018-10-24 12:34:44,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-24 12:34:44,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-10-24 12:34:44,710 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 29 [2018-10-24 12:34:44,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:44,711 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-10-24 12:34:44,711 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:34:44,711 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-10-24 12:34:44,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-24 12:34:44,712 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:44,712 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:44,713 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:44,713 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:44,713 INFO L82 PathProgramCache]: Analyzing trace with hash 95654235, now seen corresponding path program 1 times [2018-10-24 12:34:44,713 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:44,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:44,714 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:44,715 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:44,715 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:44,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:44,845 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:44,846 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:44,846 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:44,847 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 30 with the following transitions: [2018-10-24 12:34:44,847 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [16], [20], [22], [26], [30], [34], [40], [44], [50], [52], [57], [60], [62], [65], [67], [68], [69], [70], [72], [73] [2018-10-24 12:34:44,849 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:34:44,849 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:34:44,984 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:34:44,985 INFO L272 AbstractInterpreter]: Visited 24 different actions 90 times. Merged at 11 different actions 34 times. Widened at 1 different actions 3 times. Found 4 fixpoints after 3 different actions. Largest state had 12 variables. [2018-10-24 12:34:45,000 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:45,000 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:34:45,000 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:45,000 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 12:34:45,009 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:45,009 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:45,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:45,035 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:45,229 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:45,230 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:45,374 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:45,404 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:45,404 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 13 [2018-10-24 12:34:45,404 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:45,405 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:34:45,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:34:45,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:34:45,406 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 13 states. [2018-10-24 12:34:45,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:45,834 INFO L93 Difference]: Finished difference Result 79 states and 91 transitions. [2018-10-24 12:34:45,835 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:34:45,835 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 29 [2018-10-24 12:34:45,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:45,836 INFO L225 Difference]: With dead ends: 79 [2018-10-24 12:34:45,837 INFO L226 Difference]: Without dead ends: 62 [2018-10-24 12:34:45,838 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 49 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=105, Invalid=275, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:34:45,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-10-24 12:34:45,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 40. [2018-10-24 12:34:45,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-24 12:34:45,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2018-10-24 12:34:45,847 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 29 [2018-10-24 12:34:45,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:45,848 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2018-10-24 12:34:45,848 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:34:45,848 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2018-10-24 12:34:45,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-24 12:34:45,849 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:45,849 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:45,850 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:45,850 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:45,850 INFO L82 PathProgramCache]: Analyzing trace with hash -446111159, now seen corresponding path program 2 times [2018-10-24 12:34:45,850 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:45,851 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:45,851 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:45,852 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:45,852 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:45,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:45,946 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:45,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:45,946 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:45,947 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:45,947 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:45,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:45,947 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 12:34:45,955 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:45,955 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:45,988 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:34:45,988 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:45,991 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:46,015 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:46,016 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:46,084 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:46,104 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:46,105 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 10 [2018-10-24 12:34:46,105 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:46,105 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:34:46,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:34:46,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:34:46,106 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand 10 states. [2018-10-24 12:34:46,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:46,238 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2018-10-24 12:34:46,239 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:34:46,239 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2018-10-24 12:34:46,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:46,241 INFO L225 Difference]: With dead ends: 50 [2018-10-24 12:34:46,241 INFO L226 Difference]: Without dead ends: 48 [2018-10-24 12:34:46,242 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 59 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:34:46,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-24 12:34:46,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-24 12:34:46,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-24 12:34:46,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2018-10-24 12:34:46,251 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 31 [2018-10-24 12:34:46,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:46,251 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2018-10-24 12:34:46,252 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:34:46,252 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2018-10-24 12:34:46,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-24 12:34:46,253 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:46,253 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:46,253 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:46,254 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:46,254 INFO L82 PathProgramCache]: Analyzing trace with hash 94447981, now seen corresponding path program 3 times [2018-10-24 12:34:46,254 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:46,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:46,255 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:46,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:46,255 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:46,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:46,496 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:34:46,497 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:46,497 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:46,497 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:46,497 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:46,497 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:46,497 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 12:34:46,504 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:46,505 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:46,520 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:46,520 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:46,523 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:46,796 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:34:46,796 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:46,855 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:34:46,877 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:46,877 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 18 [2018-10-24 12:34:46,878 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:46,878 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:34:46,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:34:46,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=235, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:34:46,879 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 18 states. [2018-10-24 12:34:47,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:47,286 INFO L93 Difference]: Finished difference Result 87 states and 98 transitions. [2018-10-24 12:34:47,286 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:34:47,287 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 39 [2018-10-24 12:34:47,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:47,289 INFO L225 Difference]: With dead ends: 87 [2018-10-24 12:34:47,289 INFO L226 Difference]: Without dead ends: 66 [2018-10-24 12:34:47,291 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 64 SyntacticMatches, 8 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=163, Invalid=487, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:34:47,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-24 12:34:47,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 50. [2018-10-24 12:34:47,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-24 12:34:47,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2018-10-24 12:34:47,300 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 39 [2018-10-24 12:34:47,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:47,300 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2018-10-24 12:34:47,301 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:34:47,301 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2018-10-24 12:34:47,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-24 12:34:47,302 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:47,302 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:47,303 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:47,303 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:47,303 INFO L82 PathProgramCache]: Analyzing trace with hash 594202361, now seen corresponding path program 1 times [2018-10-24 12:34:47,303 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:47,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:47,304 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:47,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:47,305 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:47,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:47,442 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 14 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:34:47,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:47,442 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:47,442 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 40 with the following transitions: [2018-10-24 12:34:47,443 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [16], [20], [22], [26], [30], [34], [36], [40], [44], [50], [52], [57], [60], [62], [65], [67], [68], [69], [70], [72], [73] [2018-10-24 12:34:47,444 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:34:47,445 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:34:47,545 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:34:47,546 INFO L272 AbstractInterpreter]: Visited 25 different actions 107 times. Merged at 12 different actions 46 times. Widened at 2 different actions 7 times. Found 9 fixpoints after 3 different actions. Largest state had 14 variables. [2018-10-24 12:34:47,577 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:47,578 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:34:47,578 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:47,578 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 12:34:47,589 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:47,589 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:47,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:47,623 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:47,846 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 14 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:34:47,847 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:47,937 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 14 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:34:47,959 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:47,959 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2018-10-24 12:34:47,959 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:47,960 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:34:47,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:34:47,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:34:47,962 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 17 states. [2018-10-24 12:34:48,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:48,276 INFO L93 Difference]: Finished difference Result 103 states and 118 transitions. [2018-10-24 12:34:48,277 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:34:48,277 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2018-10-24 12:34:48,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:48,278 INFO L225 Difference]: With dead ends: 103 [2018-10-24 12:34:48,278 INFO L226 Difference]: Without dead ends: 82 [2018-10-24 12:34:48,279 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 65 SyntacticMatches, 8 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=171, Invalid=531, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:34:48,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-10-24 12:34:48,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 50. [2018-10-24 12:34:48,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-24 12:34:48,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2018-10-24 12:34:48,289 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 39 [2018-10-24 12:34:48,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:48,290 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2018-10-24 12:34:48,290 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:34:48,290 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2018-10-24 12:34:48,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-24 12:34:48,291 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:48,291 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:48,291 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:48,291 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:48,292 INFO L82 PathProgramCache]: Analyzing trace with hash -1103599739, now seen corresponding path program 2 times [2018-10-24 12:34:48,292 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:48,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:48,293 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:48,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:48,293 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:48,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:48,414 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:34:48,414 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:48,414 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:48,415 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:48,415 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:48,415 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:48,416 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 12:34:48,425 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:48,425 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:48,447 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:34:48,448 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:48,450 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:48,957 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:34:48,957 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:49,063 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:34:49,084 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:49,084 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 16 [2018-10-24 12:34:49,084 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:49,084 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:34:49,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:34:49,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:34:49,085 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 16 states. [2018-10-24 12:34:49,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:49,393 INFO L93 Difference]: Finished difference Result 122 states and 142 transitions. [2018-10-24 12:34:49,396 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:34:49,396 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2018-10-24 12:34:49,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:49,398 INFO L225 Difference]: With dead ends: 122 [2018-10-24 12:34:49,398 INFO L226 Difference]: Without dead ends: 101 [2018-10-24 12:34:49,399 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 66 SyntacticMatches, 8 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=163, Invalid=487, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:34:49,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2018-10-24 12:34:49,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 53. [2018-10-24 12:34:49,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-24 12:34:49,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 58 transitions. [2018-10-24 12:34:49,413 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 58 transitions. Word has length 39 [2018-10-24 12:34:49,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:49,413 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 58 transitions. [2018-10-24 12:34:49,414 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:34:49,414 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 58 transitions. [2018-10-24 12:34:49,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-24 12:34:49,415 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:49,415 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:49,415 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:49,415 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:49,416 INFO L82 PathProgramCache]: Analyzing trace with hash -1990570393, now seen corresponding path program 4 times [2018-10-24 12:34:49,416 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:49,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:49,417 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:49,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:49,417 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:49,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:49,541 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 15 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-24 12:34:49,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:49,541 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:49,542 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:49,542 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:49,542 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:49,542 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 12:34:49,550 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:49,550 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:49,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:49,569 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:49,617 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:34:49,617 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:49,684 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:34:49,706 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:49,707 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 11 [2018-10-24 12:34:49,707 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:49,707 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:34:49,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:34:49,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:34:49,708 INFO L87 Difference]: Start difference. First operand 53 states and 58 transitions. Second operand 11 states. [2018-10-24 12:34:50,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:50,080 INFO L93 Difference]: Finished difference Result 63 states and 68 transitions. [2018-10-24 12:34:50,081 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:34:50,081 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2018-10-24 12:34:50,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:50,082 INFO L225 Difference]: With dead ends: 63 [2018-10-24 12:34:50,082 INFO L226 Difference]: Without dead ends: 61 [2018-10-24 12:34:50,083 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 78 SyntacticMatches, 7 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:34:50,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-24 12:34:50,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-10-24 12:34:50,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-10-24 12:34:50,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 66 transitions. [2018-10-24 12:34:50,093 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 66 transitions. Word has length 41 [2018-10-24 12:34:50,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:50,093 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 66 transitions. [2018-10-24 12:34:50,093 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:34:50,094 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 66 transitions. [2018-10-24 12:34:50,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 12:34:50,095 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:50,095 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:50,095 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:50,095 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:50,095 INFO L82 PathProgramCache]: Analyzing trace with hash 1735104395, now seen corresponding path program 5 times [2018-10-24 12:34:50,096 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:50,096 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:50,097 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:50,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:50,097 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:50,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:50,491 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:50,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:50,491 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:50,492 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:50,492 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:50,492 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:50,492 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 12:34:50,505 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:50,505 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:50,522 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 12:34:50,522 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:50,524 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:50,772 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:50,772 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:50,931 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:50,953 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:50,953 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 22 [2018-10-24 12:34:50,953 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:50,954 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:34:50,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:34:50,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=359, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:34:50,955 INFO L87 Difference]: Start difference. First operand 61 states and 66 transitions. Second operand 22 states. [2018-10-24 12:34:51,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:51,419 INFO L93 Difference]: Finished difference Result 110 states and 124 transitions. [2018-10-24 12:34:51,424 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:34:51,424 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 49 [2018-10-24 12:34:51,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:51,425 INFO L225 Difference]: With dead ends: 110 [2018-10-24 12:34:51,426 INFO L226 Difference]: Without dead ends: 85 [2018-10-24 12:34:51,427 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 80 SyntacticMatches, 10 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 338 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=233, Invalid=759, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:34:51,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-24 12:34:51,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 63. [2018-10-24 12:34:51,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-24 12:34:51,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 68 transitions. [2018-10-24 12:34:51,440 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 68 transitions. Word has length 49 [2018-10-24 12:34:51,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:51,440 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 68 transitions. [2018-10-24 12:34:51,440 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:34:51,440 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 68 transitions. [2018-10-24 12:34:51,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 12:34:51,441 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:51,442 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:51,442 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:51,442 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:51,442 INFO L82 PathProgramCache]: Analyzing trace with hash 1916583447, now seen corresponding path program 2 times [2018-10-24 12:34:51,442 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:51,443 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:51,443 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:51,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:51,444 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:51,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:51,647 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:51,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:51,647 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:51,647 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:51,647 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:51,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:51,648 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 12:34:51,657 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:51,657 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:51,725 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 12:34:51,725 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:51,728 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:52,223 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:52,223 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:52,453 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:52,474 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:52,474 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 21 [2018-10-24 12:34:52,474 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:52,475 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:34:52,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:34:52,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=329, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:34:52,476 INFO L87 Difference]: Start difference. First operand 63 states and 68 transitions. Second operand 21 states. [2018-10-24 12:34:52,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:52,905 INFO L93 Difference]: Finished difference Result 132 states and 151 transitions. [2018-10-24 12:34:52,905 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:34:52,906 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2018-10-24 12:34:52,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:52,907 INFO L225 Difference]: With dead ends: 132 [2018-10-24 12:34:52,907 INFO L226 Difference]: Without dead ends: 107 [2018-10-24 12:34:52,908 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 81 SyntacticMatches, 10 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=253, Invalid=869, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:34:52,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2018-10-24 12:34:52,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 63. [2018-10-24 12:34:52,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-24 12:34:52,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 68 transitions. [2018-10-24 12:34:52,921 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 68 transitions. Word has length 49 [2018-10-24 12:34:52,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:52,921 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 68 transitions. [2018-10-24 12:34:52,921 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:34:52,922 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 68 transitions. [2018-10-24 12:34:52,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 12:34:52,923 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:52,923 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:52,923 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:52,923 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:52,923 INFO L82 PathProgramCache]: Analyzing trace with hash -402778205, now seen corresponding path program 3 times [2018-10-24 12:34:52,923 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:52,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:52,924 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:52,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:52,925 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:52,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:53,108 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:53,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:53,108 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:53,109 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:53,109 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:53,109 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:53,109 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 12:34:53,117 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:53,117 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:53,159 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:53,159 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:53,162 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:53,391 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:53,391 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:53,452 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:53,473 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:53,473 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2018-10-24 12:34:53,473 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:53,473 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:34:53,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:34:53,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:34:53,474 INFO L87 Difference]: Start difference. First operand 63 states and 68 transitions. Second operand 20 states. [2018-10-24 12:34:53,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:53,963 INFO L93 Difference]: Finished difference Result 152 states and 176 transitions. [2018-10-24 12:34:53,968 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:34:53,968 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 49 [2018-10-24 12:34:53,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:53,970 INFO L225 Difference]: With dead ends: 152 [2018-10-24 12:34:53,970 INFO L226 Difference]: Without dead ends: 127 [2018-10-24 12:34:53,971 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 82 SyntacticMatches, 10 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=253, Invalid=869, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:34:53,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-24 12:34:53,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 63. [2018-10-24 12:34:53,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-24 12:34:53,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 68 transitions. [2018-10-24 12:34:53,986 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 68 transitions. Word has length 49 [2018-10-24 12:34:53,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:53,986 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 68 transitions. [2018-10-24 12:34:53,986 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:34:53,986 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 68 transitions. [2018-10-24 12:34:53,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 12:34:53,987 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:53,987 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:53,987 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:53,988 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:53,988 INFO L82 PathProgramCache]: Analyzing trace with hash 488662063, now seen corresponding path program 3 times [2018-10-24 12:34:53,988 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:53,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:53,989 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:53,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:53,989 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:53,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:54,158 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:54,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:54,159 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:54,159 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:54,159 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:54,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:54,159 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 12:34:54,167 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:54,167 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:54,184 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:54,184 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:54,186 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:54,312 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:54,313 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:54,554 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:54,575 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:54,575 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 19 [2018-10-24 12:34:54,576 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:54,576 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:34:54,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:34:54,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=263, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:34:54,577 INFO L87 Difference]: Start difference. First operand 63 states and 68 transitions. Second operand 19 states. [2018-10-24 12:34:55,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:55,058 INFO L93 Difference]: Finished difference Result 175 states and 205 transitions. [2018-10-24 12:34:55,060 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:34:55,060 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 49 [2018-10-24 12:34:55,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:55,062 INFO L225 Difference]: With dead ends: 175 [2018-10-24 12:34:55,062 INFO L226 Difference]: Without dead ends: 150 [2018-10-24 12:34:55,063 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 83 SyntacticMatches, 10 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=233, Invalid=759, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:34:55,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-10-24 12:34:55,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 66. [2018-10-24 12:34:55,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-24 12:34:55,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 72 transitions. [2018-10-24 12:34:55,078 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 72 transitions. Word has length 49 [2018-10-24 12:34:55,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:55,079 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 72 transitions. [2018-10-24 12:34:55,079 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:34:55,079 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 72 transitions. [2018-10-24 12:34:55,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-24 12:34:55,080 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:55,080 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:55,080 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:55,080 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:55,081 INFO L82 PathProgramCache]: Analyzing trace with hash -396473339, now seen corresponding path program 6 times [2018-10-24 12:34:55,081 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:55,081 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:55,081 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:55,082 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:55,082 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:55,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:55,529 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 25 proven. 28 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-24 12:34:55,530 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:55,530 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:55,530 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:55,530 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:55,530 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:55,530 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 12:34:55,538 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:55,538 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:55,557 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:55,557 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:55,559 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:55,587 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:55,587 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:55,638 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:55,659 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:55,659 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 12 [2018-10-24 12:34:55,659 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:55,659 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:34:55,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:34:55,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:34:55,660 INFO L87 Difference]: Start difference. First operand 66 states and 72 transitions. Second operand 12 states. [2018-10-24 12:34:55,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:55,814 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2018-10-24 12:34:55,815 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:34:55,815 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 51 [2018-10-24 12:34:55,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:55,817 INFO L225 Difference]: With dead ends: 76 [2018-10-24 12:34:55,817 INFO L226 Difference]: Without dead ends: 74 [2018-10-24 12:34:55,818 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 97 SyntacticMatches, 9 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:34:55,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-24 12:34:55,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2018-10-24 12:34:55,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-24 12:34:55,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 80 transitions. [2018-10-24 12:34:55,830 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 80 transitions. Word has length 51 [2018-10-24 12:34:55,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:55,831 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 80 transitions. [2018-10-24 12:34:55,831 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:34:55,831 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 80 transitions. [2018-10-24 12:34:55,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:34:55,832 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:55,832 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:55,832 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:55,832 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:55,832 INFO L82 PathProgramCache]: Analyzing trace with hash 928978729, now seen corresponding path program 7 times [2018-10-24 12:34:55,833 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:55,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:55,833 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:55,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:55,833 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:55,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:55,997 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:34:55,997 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:55,997 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:55,997 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:55,997 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:55,997 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:55,998 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 12:34:56,006 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:56,006 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:56,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:56,027 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:56,233 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:34:56,233 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:56,351 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:34:56,373 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:56,373 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 26 [2018-10-24 12:34:56,373 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:56,374 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:34:56,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:34:56,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=509, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:34:56,375 INFO L87 Difference]: Start difference. First operand 74 states and 80 transitions. Second operand 26 states. [2018-10-24 12:34:56,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:56,691 INFO L93 Difference]: Finished difference Result 133 states and 150 transitions. [2018-10-24 12:34:56,692 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:34:56,692 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2018-10-24 12:34:56,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:56,693 INFO L225 Difference]: With dead ends: 133 [2018-10-24 12:34:56,693 INFO L226 Difference]: Without dead ends: 104 [2018-10-24 12:34:56,695 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 96 SyntacticMatches, 12 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=315, Invalid=1091, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:34:56,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2018-10-24 12:34:56,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 76. [2018-10-24 12:34:56,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-10-24 12:34:56,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2018-10-24 12:34:56,712 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 59 [2018-10-24 12:34:56,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:56,713 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2018-10-24 12:34:56,713 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:34:56,713 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2018-10-24 12:34:56,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:34:56,714 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:56,714 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:56,714 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:56,714 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:56,715 INFO L82 PathProgramCache]: Analyzing trace with hash 277511861, now seen corresponding path program 4 times [2018-10-24 12:34:56,715 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:56,715 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:56,716 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:56,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:56,716 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:56,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:56,916 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 44 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:34:56,916 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:56,916 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:56,916 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:56,917 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:56,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:56,917 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 12:34:56,925 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:56,925 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:56,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:56,961 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:57,161 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 44 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:34:57,161 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:57,238 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 44 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:34:57,258 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:57,258 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 25 [2018-10-24 12:34:57,258 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:57,258 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:34:57,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:34:57,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=474, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:34:57,259 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 25 states. [2018-10-24 12:34:58,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:58,090 INFO L93 Difference]: Finished difference Result 161 states and 184 transitions. [2018-10-24 12:34:58,090 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:34:58,091 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 59 [2018-10-24 12:34:58,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:58,092 INFO L225 Difference]: With dead ends: 161 [2018-10-24 12:34:58,092 INFO L226 Difference]: Without dead ends: 132 [2018-10-24 12:34:58,093 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 97 SyntacticMatches, 12 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 570 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=351, Invalid=1289, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:34:58,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-10-24 12:34:58,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 76. [2018-10-24 12:34:58,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-10-24 12:34:58,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2018-10-24 12:34:58,108 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 59 [2018-10-24 12:34:58,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:58,108 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2018-10-24 12:34:58,108 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:34:58,108 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2018-10-24 12:34:58,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:34:58,109 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:58,109 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:58,109 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:58,109 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:58,109 INFO L82 PathProgramCache]: Analyzing trace with hash -129869503, now seen corresponding path program 5 times [2018-10-24 12:34:58,109 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:58,110 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:58,110 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:58,110 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:58,110 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:58,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:58,322 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 44 proven. 12 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:34:58,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:58,322 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:58,322 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:58,322 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:58,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:58,323 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 12:34:58,330 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:58,330 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:58,349 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-24 12:34:58,349 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:58,352 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:58,509 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 44 proven. 12 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:34:58,509 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:58,596 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 44 proven. 12 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:34:58,616 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:58,616 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 24 [2018-10-24 12:34:58,617 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:58,617 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:34:58,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:34:58,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:34:58,618 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 24 states. [2018-10-24 12:34:59,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:59,071 INFO L93 Difference]: Finished difference Result 187 states and 216 transitions. [2018-10-24 12:34:59,072 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:34:59,072 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 59 [2018-10-24 12:34:59,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:59,073 INFO L225 Difference]: With dead ends: 187 [2018-10-24 12:34:59,073 INFO L226 Difference]: Without dead ends: 158 [2018-10-24 12:34:59,074 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 98 SyntacticMatches, 12 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 573 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=364, Invalid=1358, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:34:59,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2018-10-24 12:34:59,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 76. [2018-10-24 12:34:59,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-10-24 12:34:59,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2018-10-24 12:34:59,094 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 59 [2018-10-24 12:34:59,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:59,095 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2018-10-24 12:34:59,095 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:34:59,095 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2018-10-24 12:34:59,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:34:59,096 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:59,096 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:59,096 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:59,096 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:59,096 INFO L82 PathProgramCache]: Analyzing trace with hash -49846579, now seen corresponding path program 6 times [2018-10-24 12:34:59,096 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:59,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:59,097 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:59,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:59,097 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:59,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:59,242 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 44 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:34:59,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:59,242 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:59,242 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:59,242 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:59,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:59,243 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 12:34:59,250 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:59,250 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:59,289 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:59,289 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:59,291 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:59,441 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 44 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:34:59,441 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:59,529 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 44 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:34:59,549 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:59,549 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2018-10-24 12:34:59,549 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:59,550 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:34:59,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:34:59,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=398, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:34:59,550 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 23 states. [2018-10-24 12:35:00,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:00,027 INFO L93 Difference]: Finished difference Result 211 states and 246 transitions. [2018-10-24 12:35:00,027 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 12:35:00,027 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 59 [2018-10-24 12:35:00,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:00,029 INFO L225 Difference]: With dead ends: 211 [2018-10-24 12:35:00,029 INFO L226 Difference]: Without dead ends: 182 [2018-10-24 12:35:00,030 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 99 SyntacticMatches, 12 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=351, Invalid=1289, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:35:00,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-10-24 12:35:00,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 76. [2018-10-24 12:35:00,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-10-24 12:35:00,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2018-10-24 12:35:00,052 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 59 [2018-10-24 12:35:00,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:00,052 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2018-10-24 12:35:00,052 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:35:00,053 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2018-10-24 12:35:00,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:35:00,053 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:00,053 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:00,054 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:00,054 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:00,054 INFO L82 PathProgramCache]: Analyzing trace with hash 1451911001, now seen corresponding path program 4 times [2018-10-24 12:35:00,054 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:00,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:00,055 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:00,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:00,055 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:00,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:00,237 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:35:00,238 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:00,238 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:00,238 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:00,238 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:00,238 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:00,238 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 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 12:35:00,250 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:00,250 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:00,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:00,270 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:00,577 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:35:00,577 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:00,704 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:35:00,725 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:00,725 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 22 [2018-10-24 12:35:00,725 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:00,726 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:35:00,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:35:00,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:35:00,726 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 22 states. [2018-10-24 12:35:01,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:01,139 INFO L93 Difference]: Finished difference Result 238 states and 280 transitions. [2018-10-24 12:35:01,139 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:35:01,139 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 59 [2018-10-24 12:35:01,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:01,141 INFO L225 Difference]: With dead ends: 238 [2018-10-24 12:35:01,141 INFO L226 Difference]: Without dead ends: 209 [2018-10-24 12:35:01,142 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 100 SyntacticMatches, 12 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 426 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=315, Invalid=1091, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:35:01,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2018-10-24 12:35:01,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 79. [2018-10-24 12:35:01,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-24 12:35:01,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 86 transitions. [2018-10-24 12:35:01,167 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 86 transitions. Word has length 59 [2018-10-24 12:35:01,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:01,168 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 86 transitions. [2018-10-24 12:35:01,168 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:35:01,168 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 86 transitions. [2018-10-24 12:35:01,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-24 12:35:01,169 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:01,169 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:01,169 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:01,169 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:01,169 INFO L82 PathProgramCache]: Analyzing trace with hash 1954413347, now seen corresponding path program 8 times [2018-10-24 12:35:01,169 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:01,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:01,170 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:01,170 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:01,170 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:01,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:01,303 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 37 proven. 46 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:35:01,303 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:01,303 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:01,304 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:01,304 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:01,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:01,304 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 12:35:01,311 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:01,311 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:01,330 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:35:01,330 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:01,332 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:01,362 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:35:01,363 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:01,427 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:35:01,447 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:01,447 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 13 [2018-10-24 12:35:01,447 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:01,447 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:35:01,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:35:01,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:35:01,448 INFO L87 Difference]: Start difference. First operand 79 states and 86 transitions. Second operand 13 states. [2018-10-24 12:35:01,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:01,568 INFO L93 Difference]: Finished difference Result 89 states and 96 transitions. [2018-10-24 12:35:01,569 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:35:01,569 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2018-10-24 12:35:01,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:01,570 INFO L225 Difference]: With dead ends: 89 [2018-10-24 12:35:01,570 INFO L226 Difference]: Without dead ends: 87 [2018-10-24 12:35:01,571 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 116 SyntacticMatches, 11 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:35:01,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-24 12:35:01,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-10-24 12:35:01,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-10-24 12:35:01,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 94 transitions. [2018-10-24 12:35:01,588 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 94 transitions. Word has length 61 [2018-10-24 12:35:01,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:01,589 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 94 transitions. [2018-10-24 12:35:01,589 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:35:01,589 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 94 transitions. [2018-10-24 12:35:01,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-24 12:35:01,590 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:01,590 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:01,590 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:01,590 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:01,590 INFO L82 PathProgramCache]: Analyzing trace with hash 1550108743, now seen corresponding path program 9 times [2018-10-24 12:35:01,590 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:01,591 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:01,591 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:01,591 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:01,591 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:01,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:02,428 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:02,428 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:02,429 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:02,429 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:02,429 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:02,429 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:02,429 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 12:35:02,437 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:02,438 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:02,462 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:02,463 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:02,465 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:03,080 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:03,080 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:03,203 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:03,224 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:03,224 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 30 [2018-10-24 12:35:03,224 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:03,225 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:35:03,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:35:03,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=685, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:35:03,226 INFO L87 Difference]: Start difference. First operand 87 states and 94 transitions. Second operand 30 states. [2018-10-24 12:35:03,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:03,716 INFO L93 Difference]: Finished difference Result 156 states and 176 transitions. [2018-10-24 12:35:03,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:35:03,717 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 69 [2018-10-24 12:35:03,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:03,718 INFO L225 Difference]: With dead ends: 156 [2018-10-24 12:35:03,718 INFO L226 Difference]: Without dead ends: 123 [2018-10-24 12:35:03,720 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 112 SyntacticMatches, 14 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 755 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=409, Invalid=1483, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:35:03,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-24 12:35:03,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 89. [2018-10-24 12:35:03,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-24 12:35:03,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2018-10-24 12:35:03,743 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 69 [2018-10-24 12:35:03,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:03,743 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2018-10-24 12:35:03,743 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:35:03,743 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2018-10-24 12:35:03,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-24 12:35:03,744 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:03,744 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:03,744 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:03,744 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:03,745 INFO L82 PathProgramCache]: Analyzing trace with hash 1825386707, now seen corresponding path program 7 times [2018-10-24 12:35:03,745 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:03,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:03,746 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:03,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:03,746 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:03,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:04,016 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:04,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:04,016 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:04,016 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:04,016 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:04,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:04,016 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 12:35:04,024 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:04,024 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:04,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:04,045 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:04,248 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:04,249 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:04,689 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:04,709 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:04,710 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 29 [2018-10-24 12:35:04,710 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:04,710 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:35:04,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:35:04,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:35:04,711 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 29 states. [2018-10-24 12:35:05,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:05,245 INFO L93 Difference]: Finished difference Result 190 states and 217 transitions. [2018-10-24 12:35:05,245 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:35:05,246 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 69 [2018-10-24 12:35:05,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:05,247 INFO L225 Difference]: With dead ends: 190 [2018-10-24 12:35:05,247 INFO L226 Difference]: Without dead ends: 157 [2018-10-24 12:35:05,248 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 113 SyntacticMatches, 14 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 837 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=465, Invalid=1791, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:35:05,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-24 12:35:05,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 89. [2018-10-24 12:35:05,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-24 12:35:05,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2018-10-24 12:35:05,273 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 69 [2018-10-24 12:35:05,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:05,274 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2018-10-24 12:35:05,274 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:35:05,274 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2018-10-24 12:35:05,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-24 12:35:05,275 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:05,275 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:05,275 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:05,275 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:05,275 INFO L82 PathProgramCache]: Analyzing trace with hash -1995551649, now seen corresponding path program 8 times [2018-10-24 12:35:05,275 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:05,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:05,276 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:05,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:05,276 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:05,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:05,634 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 65 proven. 18 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:05,634 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:05,634 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:05,635 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:05,635 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:05,635 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:05,635 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 12:35:05,643 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:05,643 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:05,665 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:35:05,665 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:05,668 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:05,945 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 65 proven. 18 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:05,945 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:06,064 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 65 proven. 18 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:06,084 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:06,084 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 28 [2018-10-24 12:35:06,085 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:06,085 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:35:06,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:35:06,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=603, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:35:06,086 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 28 states. [2018-10-24 12:35:06,428 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-24 12:35:07,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:07,023 INFO L93 Difference]: Finished difference Result 222 states and 256 transitions. [2018-10-24 12:35:07,024 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:35:07,024 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 69 [2018-10-24 12:35:07,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:07,026 INFO L225 Difference]: With dead ends: 222 [2018-10-24 12:35:07,026 INFO L226 Difference]: Without dead ends: 189 [2018-10-24 12:35:07,027 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 114 SyntacticMatches, 14 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 873 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=496, Invalid=1954, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:35:07,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2018-10-24 12:35:07,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 89. [2018-10-24 12:35:07,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-24 12:35:07,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2018-10-24 12:35:07,054 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 69 [2018-10-24 12:35:07,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:07,055 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2018-10-24 12:35:07,055 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:35:07,055 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2018-10-24 12:35:07,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-24 12:35:07,056 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:07,056 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:07,056 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:07,056 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:07,056 INFO L82 PathProgramCache]: Analyzing trace with hash 632871659, now seen corresponding path program 9 times [2018-10-24 12:35:07,056 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:07,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:07,057 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:07,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:07,057 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:07,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:07,222 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 65 proven. 18 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:07,222 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:07,222 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:07,223 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:07,223 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:07,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:07,223 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 12:35:07,231 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:07,231 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:07,249 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:07,249 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:07,251 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:07,469 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 65 proven. 18 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:07,469 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:07,592 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 65 proven. 18 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:07,612 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:07,612 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 27 [2018-10-24 12:35:07,612 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:07,613 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:35:07,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:35:07,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=559, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:35:07,613 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 27 states. [2018-10-24 12:35:08,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:08,639 INFO L93 Difference]: Finished difference Result 252 states and 293 transitions. [2018-10-24 12:35:08,639 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:35:08,639 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 69 [2018-10-24 12:35:08,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:08,640 INFO L225 Difference]: With dead ends: 252 [2018-10-24 12:35:08,640 INFO L226 Difference]: Without dead ends: 219 [2018-10-24 12:35:08,641 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 115 SyntacticMatches, 14 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 849 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=496, Invalid=1954, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:35:08,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-10-24 12:35:08,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 89. [2018-10-24 12:35:08,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-24 12:35:08,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2018-10-24 12:35:08,680 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 69 [2018-10-24 12:35:08,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:08,681 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2018-10-24 12:35:08,681 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:35:08,681 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2018-10-24 12:35:08,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-24 12:35:08,682 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:08,682 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:08,682 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:08,682 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:08,683 INFO L82 PathProgramCache]: Analyzing trace with hash 613260407, now seen corresponding path program 10 times [2018-10-24 12:35:08,683 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:08,683 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:08,683 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:08,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:08,684 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:08,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:09,394 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:09,395 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:09,395 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:09,395 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:09,395 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:09,395 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:09,395 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 12:35:09,402 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:09,402 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:09,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:09,423 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:09,628 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:09,628 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:09,759 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:09,778 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:09,779 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2018-10-24 12:35:09,779 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:09,779 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:35:09,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:35:09,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=513, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:35:09,780 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 26 states. [2018-10-24 12:35:10,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:10,356 INFO L93 Difference]: Finished difference Result 280 states and 328 transitions. [2018-10-24 12:35:10,357 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:35:10,357 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 69 [2018-10-24 12:35:10,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:10,359 INFO L225 Difference]: With dead ends: 280 [2018-10-24 12:35:10,359 INFO L226 Difference]: Without dead ends: 247 [2018-10-24 12:35:10,360 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 116 SyntacticMatches, 14 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 759 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=465, Invalid=1791, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:35:10,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-10-24 12:35:10,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 89. [2018-10-24 12:35:10,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-24 12:35:10,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2018-10-24 12:35:10,398 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 69 [2018-10-24 12:35:10,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:10,399 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2018-10-24 12:35:10,399 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:35:10,399 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2018-10-24 12:35:10,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-24 12:35:10,400 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:10,400 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:10,400 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:10,400 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:10,400 INFO L82 PathProgramCache]: Analyzing trace with hash 1618825475, now seen corresponding path program 5 times [2018-10-24 12:35:10,400 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:10,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:10,401 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:10,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:10,401 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:10,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:10,781 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:10,781 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:10,781 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:10,782 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:10,782 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:10,782 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:10,782 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 12:35:10,790 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:10,791 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:10,817 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:35:10,818 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:10,820 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:11,018 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:11,019 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:11,136 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:11,157 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:11,157 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 25 [2018-10-24 12:35:11,157 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:11,157 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:35:11,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:35:11,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=465, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:35:11,158 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 25 states. [2018-10-24 12:35:11,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:11,846 INFO L93 Difference]: Finished difference Result 311 states and 367 transitions. [2018-10-24 12:35:11,847 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:35:11,847 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 69 [2018-10-24 12:35:11,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:11,849 INFO L225 Difference]: With dead ends: 311 [2018-10-24 12:35:11,849 INFO L226 Difference]: Without dead ends: 278 [2018-10-24 12:35:11,850 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 117 SyntacticMatches, 14 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 605 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=409, Invalid=1483, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:35:11,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2018-10-24 12:35:11,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 92. [2018-10-24 12:35:11,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-10-24 12:35:11,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 100 transitions. [2018-10-24 12:35:11,898 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 100 transitions. Word has length 69 [2018-10-24 12:35:11,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:11,898 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 100 transitions. [2018-10-24 12:35:11,898 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:35:11,898 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 100 transitions. [2018-10-24 12:35:11,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-24 12:35:11,899 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:11,899 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:11,899 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:11,900 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:11,900 INFO L82 PathProgramCache]: Analyzing trace with hash 2111470529, now seen corresponding path program 10 times [2018-10-24 12:35:11,900 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:11,901 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:11,901 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:11,901 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:11,901 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:11,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:12,416 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 51 proven. 68 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-24 12:35:12,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:12,417 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:12,417 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:12,417 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:12,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:12,417 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 12:35:12,425 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:12,425 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:12,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:12,447 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:12,847 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:12,848 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:13,069 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:35:13,089 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:13,089 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 14 [2018-10-24 12:35:13,089 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:13,090 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:35:13,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:35:13,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:35:13,090 INFO L87 Difference]: Start difference. First operand 92 states and 100 transitions. Second operand 14 states. [2018-10-24 12:35:13,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:13,261 INFO L93 Difference]: Finished difference Result 102 states and 110 transitions. [2018-10-24 12:35:13,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:35:13,262 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 71 [2018-10-24 12:35:13,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:13,263 INFO L225 Difference]: With dead ends: 102 [2018-10-24 12:35:13,263 INFO L226 Difference]: Without dead ends: 100 [2018-10-24 12:35:13,263 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 135 SyntacticMatches, 13 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:35:13,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-24 12:35:13,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2018-10-24 12:35:13,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-10-24 12:35:13,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 108 transitions. [2018-10-24 12:35:13,291 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 108 transitions. Word has length 71 [2018-10-24 12:35:13,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:13,291 INFO L481 AbstractCegarLoop]: Abstraction has 100 states and 108 transitions. [2018-10-24 12:35:13,291 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:35:13,291 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 108 transitions. [2018-10-24 12:35:13,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-24 12:35:13,292 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:13,292 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:13,292 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:13,292 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:13,292 INFO L82 PathProgramCache]: Analyzing trace with hash 58575589, now seen corresponding path program 11 times [2018-10-24 12:35:13,292 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:13,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:13,293 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:13,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:13,293 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:13,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:13,503 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:13,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:13,504 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:13,504 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:13,504 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:13,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:13,504 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 12:35:13,512 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:13,512 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:13,541 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-24 12:35:13,541 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:13,543 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:13,848 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:13,848 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:13,981 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:14,002 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:14,002 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 34 [2018-10-24 12:35:14,002 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:14,002 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:35:14,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:35:14,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=887, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:35:14,003 INFO L87 Difference]: Start difference. First operand 100 states and 108 transitions. Second operand 34 states. [2018-10-24 12:35:14,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:14,837 INFO L93 Difference]: Finished difference Result 179 states and 202 transitions. [2018-10-24 12:35:14,838 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:35:14,838 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 79 [2018-10-24 12:35:14,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:14,839 INFO L225 Difference]: With dead ends: 179 [2018-10-24 12:35:14,839 INFO L226 Difference]: Without dead ends: 142 [2018-10-24 12:35:14,840 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 128 SyntacticMatches, 16 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1025 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=515, Invalid=1935, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:35:14,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-10-24 12:35:14,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 102. [2018-10-24 12:35:14,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-24 12:35:14,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 110 transitions. [2018-10-24 12:35:14,878 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 110 transitions. Word has length 79 [2018-10-24 12:35:14,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:14,879 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 110 transitions. [2018-10-24 12:35:14,879 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:35:14,879 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 110 transitions. [2018-10-24 12:35:14,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-24 12:35:14,879 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:14,879 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:14,879 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:14,880 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:14,880 INFO L82 PathProgramCache]: Analyzing trace with hash 127267953, now seen corresponding path program 11 times [2018-10-24 12:35:14,880 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:14,880 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:14,880 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:14,881 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:14,881 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:14,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:15,097 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 90 proven. 32 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:15,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:15,097 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:15,097 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:15,097 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:15,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:15,098 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 12:35:15,107 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:15,108 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:15,134 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-24 12:35:15,134 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:15,137 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:15,409 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 90 proven. 32 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:15,409 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:15,523 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 90 proven. 32 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:15,543 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:15,543 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 33 [2018-10-24 12:35:15,543 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:15,543 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:35:15,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:35:15,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=842, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:35:15,544 INFO L87 Difference]: Start difference. First operand 102 states and 110 transitions. Second operand 33 states. [2018-10-24 12:35:16,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:16,488 INFO L93 Difference]: Finished difference Result 219 states and 250 transitions. [2018-10-24 12:35:16,489 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:35:16,489 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 79 [2018-10-24 12:35:16,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:16,490 INFO L225 Difference]: With dead ends: 219 [2018-10-24 12:35:16,490 INFO L226 Difference]: Without dead ends: 182 [2018-10-24 12:35:16,492 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 129 SyntacticMatches, 16 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1155 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=595, Invalid=2375, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:35:16,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-10-24 12:35:16,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 102. [2018-10-24 12:35:16,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-24 12:35:16,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 110 transitions. [2018-10-24 12:35:16,555 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 110 transitions. Word has length 79 [2018-10-24 12:35:16,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:16,555 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 110 transitions. [2018-10-24 12:35:16,555 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:35:16,555 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 110 transitions. [2018-10-24 12:35:16,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-24 12:35:16,556 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:16,556 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:16,557 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:16,557 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:16,557 INFO L82 PathProgramCache]: Analyzing trace with hash 310579453, now seen corresponding path program 12 times [2018-10-24 12:35:16,557 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:16,558 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:16,558 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:16,558 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:16,558 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:16,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:16,896 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 90 proven. 26 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:16,897 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:16,897 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:16,897 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:16,897 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:16,897 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:16,897 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 12:35:16,904 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:16,904 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:16,925 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:16,925 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:16,927 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:17,189 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 90 proven. 26 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:17,189 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:17,313 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 90 proven. 26 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:17,334 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:17,334 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 32 [2018-10-24 12:35:17,334 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:17,334 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:35:17,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:35:17,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=795, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:35:17,335 INFO L87 Difference]: Start difference. First operand 102 states and 110 transitions. Second operand 32 states. [2018-10-24 12:35:18,119 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-24 12:35:18,477 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-10-24 12:35:18,864 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2018-10-24 12:35:19,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:19,774 INFO L93 Difference]: Finished difference Result 257 states and 296 transitions. [2018-10-24 12:35:19,775 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:35:19,775 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 79 [2018-10-24 12:35:19,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:19,777 INFO L225 Difference]: With dead ends: 257 [2018-10-24 12:35:19,777 INFO L226 Difference]: Without dead ends: 220 [2018-10-24 12:35:19,779 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 130 SyntacticMatches, 16 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1236 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=649, Invalid=2657, Unknown=0, NotChecked=0, Total=3306 [2018-10-24 12:35:19,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-10-24 12:35:19,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 102. [2018-10-24 12:35:19,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-24 12:35:19,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 110 transitions. [2018-10-24 12:35:19,823 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 110 transitions. Word has length 79 [2018-10-24 12:35:19,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:19,823 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 110 transitions. [2018-10-24 12:35:19,823 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:35:19,823 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 110 transitions. [2018-10-24 12:35:19,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-24 12:35:19,824 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:19,824 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:19,824 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:19,824 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:19,825 INFO L82 PathProgramCache]: Analyzing trace with hash -1427775351, now seen corresponding path program 13 times [2018-10-24 12:35:19,825 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:19,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:19,825 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:19,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:19,826 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:19,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:20,357 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 90 proven. 24 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:20,357 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:20,357 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:20,357 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:20,358 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:20,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:20,358 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 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 12:35:20,368 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:20,368 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:20,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:20,407 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:20,661 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 90 proven. 24 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:20,661 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:20,818 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 90 proven. 24 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:20,838 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:20,838 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 31 [2018-10-24 12:35:20,838 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:20,839 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:35:20,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:35:20,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=746, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:35:20,840 INFO L87 Difference]: Start difference. First operand 102 states and 110 transitions. Second operand 31 states. [2018-10-24 12:35:21,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:21,736 INFO L93 Difference]: Finished difference Result 293 states and 340 transitions. [2018-10-24 12:35:21,736 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:35:21,736 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 79 [2018-10-24 12:35:21,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:21,738 INFO L225 Difference]: With dead ends: 293 [2018-10-24 12:35:21,738 INFO L226 Difference]: Without dead ends: 256 [2018-10-24 12:35:21,739 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 131 SyntacticMatches, 16 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1248 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=668, Invalid=2754, Unknown=0, NotChecked=0, Total=3422 [2018-10-24 12:35:21,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2018-10-24 12:35:21,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 102. [2018-10-24 12:35:21,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-24 12:35:21,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 110 transitions. [2018-10-24 12:35:21,788 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 110 transitions. Word has length 79 [2018-10-24 12:35:21,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:21,788 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 110 transitions. [2018-10-24 12:35:21,788 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:35:21,789 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 110 transitions. [2018-10-24 12:35:21,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-24 12:35:21,789 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:21,789 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:21,790 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:21,790 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:21,790 INFO L82 PathProgramCache]: Analyzing trace with hash 143598357, now seen corresponding path program 14 times [2018-10-24 12:35:21,790 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:21,791 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:21,791 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:21,791 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:21,791 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:21,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:22,050 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 90 proven. 26 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:22,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:22,050 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:22,050 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:22,050 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:22,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:22,051 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 12:35:22,058 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:22,058 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:22,086 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-24 12:35:22,086 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:22,088 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:22,283 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 90 proven. 26 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:22,283 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:22,398 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 90 proven. 26 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:22,417 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:22,418 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 30 [2018-10-24 12:35:22,418 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:22,418 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:35:22,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:35:22,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=695, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:35:22,419 INFO L87 Difference]: Start difference. First operand 102 states and 110 transitions. Second operand 30 states. [2018-10-24 12:35:23,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:23,215 INFO L93 Difference]: Finished difference Result 327 states and 382 transitions. [2018-10-24 12:35:23,215 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:35:23,215 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 79 [2018-10-24 12:35:23,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:23,216 INFO L225 Difference]: With dead ends: 327 [2018-10-24 12:35:23,216 INFO L226 Difference]: Without dead ends: 290 [2018-10-24 12:35:23,218 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 132 SyntacticMatches, 16 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1182 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=649, Invalid=2657, Unknown=0, NotChecked=0, Total=3306 [2018-10-24 12:35:23,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2018-10-24 12:35:23,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 102. [2018-10-24 12:35:23,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-24 12:35:23,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 110 transitions. [2018-10-24 12:35:23,281 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 110 transitions. Word has length 79 [2018-10-24 12:35:23,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:23,281 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 110 transitions. [2018-10-24 12:35:23,282 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:35:23,282 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 110 transitions. [2018-10-24 12:35:23,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-24 12:35:23,282 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:23,283 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:23,283 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:23,283 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:23,283 INFO L82 PathProgramCache]: Analyzing trace with hash -1602250591, now seen corresponding path program 15 times [2018-10-24 12:35:23,283 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:23,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:23,284 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:23,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:23,284 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:23,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:23,978 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 90 proven. 32 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:23,978 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:23,979 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:23,979 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:23,979 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:23,979 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:23,979 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 12:35:23,987 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:23,987 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:24,011 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:24,011 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:24,013 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:24,203 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 90 proven. 32 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:24,203 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:24,338 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 90 proven. 32 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:24,358 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:24,358 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2018-10-24 12:35:24,358 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:24,358 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:35:24,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:35:24,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=642, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:35:24,359 INFO L87 Difference]: Start difference. First operand 102 states and 110 transitions. Second operand 29 states. [2018-10-24 12:35:25,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:25,184 INFO L93 Difference]: Finished difference Result 359 states and 422 transitions. [2018-10-24 12:35:25,186 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:35:25,186 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 79 [2018-10-24 12:35:25,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:25,188 INFO L225 Difference]: With dead ends: 359 [2018-10-24 12:35:25,188 INFO L226 Difference]: Without dead ends: 322 [2018-10-24 12:35:25,189 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 133 SyntacticMatches, 16 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1035 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=595, Invalid=2375, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:35:25,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2018-10-24 12:35:25,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 102. [2018-10-24 12:35:25,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-24 12:35:25,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 110 transitions. [2018-10-24 12:35:25,236 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 110 transitions. Word has length 79 [2018-10-24 12:35:25,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:25,237 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 110 transitions. [2018-10-24 12:35:25,237 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:35:25,237 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 110 transitions. [2018-10-24 12:35:25,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-24 12:35:25,237 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:25,237 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:25,238 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:25,238 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:25,238 INFO L82 PathProgramCache]: Analyzing trace with hash -1326972627, now seen corresponding path program 6 times [2018-10-24 12:35:25,238 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:25,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:25,239 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:25,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:25,239 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:25,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:25,797 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:25,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:25,798 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:25,798 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:25,798 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:25,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:25,798 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 12:35:25,805 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:25,805 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:25,830 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:25,830 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:25,832 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:26,214 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:26,214 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:26,334 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:26,354 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:26,354 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 28 [2018-10-24 12:35:26,354 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:26,354 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:35:26,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:35:26,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=587, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:35:26,355 INFO L87 Difference]: Start difference. First operand 102 states and 110 transitions. Second operand 28 states. [2018-10-24 12:35:27,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:27,154 INFO L93 Difference]: Finished difference Result 394 states and 466 transitions. [2018-10-24 12:35:27,155 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:35:27,155 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 79 [2018-10-24 12:35:27,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:27,157 INFO L225 Difference]: With dead ends: 394 [2018-10-24 12:35:27,157 INFO L226 Difference]: Without dead ends: 357 [2018-10-24 12:35:27,158 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 134 SyntacticMatches, 16 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 815 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=515, Invalid=1935, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:35:27,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2018-10-24 12:35:27,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 105. [2018-10-24 12:35:27,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-10-24 12:35:27,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 114 transitions. [2018-10-24 12:35:27,213 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 114 transitions. Word has length 79 [2018-10-24 12:35:27,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:27,213 INFO L481 AbstractCegarLoop]: Abstraction has 105 states and 114 transitions. [2018-10-24 12:35:27,213 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:35:27,213 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 114 transitions. [2018-10-24 12:35:27,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-10-24 12:35:27,214 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:27,214 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:27,214 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:27,214 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:27,215 INFO L82 PathProgramCache]: Analyzing trace with hash 1957490143, now seen corresponding path program 12 times [2018-10-24 12:35:27,215 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:27,215 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:27,215 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:27,215 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:27,215 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:27,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:27,492 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 67 proven. 94 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-24 12:35:27,492 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:27,492 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:27,492 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:27,492 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:27,492 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:27,493 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 12:35:27,499 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:27,499 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:27,523 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:27,523 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:27,525 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:27,594 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:27,595 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:27,709 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:35:27,729 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:27,729 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 15 [2018-10-24 12:35:27,729 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:27,730 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:35:27,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:35:27,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:35:27,730 INFO L87 Difference]: Start difference. First operand 105 states and 114 transitions. Second operand 15 states. [2018-10-24 12:35:27,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:27,988 INFO L93 Difference]: Finished difference Result 115 states and 124 transitions. [2018-10-24 12:35:27,988 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:35:27,988 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 81 [2018-10-24 12:35:27,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:27,990 INFO L225 Difference]: With dead ends: 115 [2018-10-24 12:35:27,990 INFO L226 Difference]: Without dead ends: 113 [2018-10-24 12:35:27,990 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 154 SyntacticMatches, 15 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:35:27,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2018-10-24 12:35:28,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2018-10-24 12:35:28,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2018-10-24 12:35:28,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 122 transitions. [2018-10-24 12:35:28,043 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 122 transitions. Word has length 81 [2018-10-24 12:35:28,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:28,043 INFO L481 AbstractCegarLoop]: Abstraction has 113 states and 122 transitions. [2018-10-24 12:35:28,043 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:35:28,043 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 122 transitions. [2018-10-24 12:35:28,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:35:28,044 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:28,044 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:28,044 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:28,044 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:28,044 INFO L82 PathProgramCache]: Analyzing trace with hash -507298045, now seen corresponding path program 13 times [2018-10-24 12:35:28,045 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:28,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:28,045 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:28,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:28,045 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:28,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:28,274 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:28,274 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:28,274 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:28,274 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:28,274 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:28,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:28,275 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 12:35:28,282 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:28,282 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:28,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:28,309 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:28,649 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:28,649 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:28,811 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:28,831 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:28,832 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 38 [2018-10-24 12:35:28,832 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:28,832 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:35:28,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:35:28,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=1115, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:35:28,833 INFO L87 Difference]: Start difference. First operand 113 states and 122 transitions. Second operand 38 states. [2018-10-24 12:35:29,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:29,459 INFO L93 Difference]: Finished difference Result 202 states and 228 transitions. [2018-10-24 12:35:29,460 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:35:29,460 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 89 [2018-10-24 12:35:29,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:29,461 INFO L225 Difference]: With dead ends: 202 [2018-10-24 12:35:29,461 INFO L226 Difference]: Without dead ends: 161 [2018-10-24 12:35:29,462 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 144 SyntacticMatches, 18 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1336 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=633, Invalid=2447, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:35:29,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2018-10-24 12:35:29,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 115. [2018-10-24 12:35:29,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-24 12:35:29,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-10-24 12:35:29,549 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-10-24 12:35:29,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:29,549 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-10-24 12:35:29,550 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:35:29,550 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-10-24 12:35:29,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:35:29,550 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:29,551 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:29,551 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:29,551 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:29,551 INFO L82 PathProgramCache]: Analyzing trace with hash -1248990833, now seen corresponding path program 16 times [2018-10-24 12:35:29,551 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:29,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:29,552 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:29,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:29,552 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:29,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:30,443 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 119 proven. 44 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:30,443 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:30,443 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:30,443 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:30,443 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:30,444 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:30,444 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 12:35:30,451 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:30,451 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:30,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:30,482 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:30,850 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 119 proven. 44 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:30,850 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:30,994 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 119 proven. 44 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:31,016 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:31,016 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 37 [2018-10-24 12:35:31,016 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:31,016 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-24 12:35:31,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-24 12:35:31,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=267, Invalid=1065, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:35:31,017 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 37 states. [2018-10-24 12:35:32,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:32,107 INFO L93 Difference]: Finished difference Result 248 states and 283 transitions. [2018-10-24 12:35:32,107 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:35:32,107 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 89 [2018-10-24 12:35:32,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:32,108 INFO L225 Difference]: With dead ends: 248 [2018-10-24 12:35:32,108 INFO L226 Difference]: Without dead ends: 207 [2018-10-24 12:35:32,109 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 145 SyntacticMatches, 18 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1524 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=741, Invalid=3041, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:35:32,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2018-10-24 12:35:32,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 115. [2018-10-24 12:35:32,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-24 12:35:32,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-10-24 12:35:32,191 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-10-24 12:35:32,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:32,192 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-10-24 12:35:32,192 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-24 12:35:32,192 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-10-24 12:35:32,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:35:32,192 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:32,192 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 6, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:32,192 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:32,192 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:32,193 INFO L82 PathProgramCache]: Analyzing trace with hash 752469787, now seen corresponding path program 17 times [2018-10-24 12:35:32,193 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:32,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:32,193 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:32,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:32,194 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:32,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:32,436 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 119 proven. 36 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:32,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:32,437 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:32,437 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:32,437 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:32,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:32,437 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 12:35:32,445 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:32,445 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:32,576 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-24 12:35:32,576 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:32,579 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:33,507 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 119 proven. 36 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:33,507 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:33,645 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 119 proven. 36 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:33,665 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:33,666 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 36 [2018-10-24 12:35:33,666 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:33,666 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:35:33,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:35:33,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=1013, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:35:33,667 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 36 states. [2018-10-24 12:35:34,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:34,632 INFO L93 Difference]: Finished difference Result 292 states and 336 transitions. [2018-10-24 12:35:34,632 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:35:34,632 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 89 [2018-10-24 12:35:34,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:34,634 INFO L225 Difference]: With dead ends: 292 [2018-10-24 12:35:34,634 INFO L226 Difference]: Without dead ends: 251 [2018-10-24 12:35:34,635 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 146 SyntacticMatches, 18 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1662 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=823, Invalid=3467, Unknown=0, NotChecked=0, Total=4290 [2018-10-24 12:35:34,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2018-10-24 12:35:34,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 115. [2018-10-24 12:35:34,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-24 12:35:34,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-10-24 12:35:34,726 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-10-24 12:35:34,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:34,727 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-10-24 12:35:34,727 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:35:34,727 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-10-24 12:35:34,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:35:34,727 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:34,728 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:34,728 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:34,728 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:34,728 INFO L82 PathProgramCache]: Analyzing trace with hash -1940416601, now seen corresponding path program 18 times [2018-10-24 12:35:34,728 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:34,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:34,729 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:34,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:34,729 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:34,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:35,824 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 119 proven. 32 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:35,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:35,824 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:35,824 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:35,824 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:35,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:35,824 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 12:35:35,832 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:35,832 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:35,859 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:35,859 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:35,861 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:36,569 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 119 proven. 32 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:36,569 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:36,719 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 119 proven. 32 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:36,738 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:36,739 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 35 [2018-10-24 12:35:36,739 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:36,739 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 12:35:36,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 12:35:36,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=959, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:35:36,740 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 35 states. [2018-10-24 12:35:37,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:37,949 INFO L93 Difference]: Finished difference Result 334 states and 387 transitions. [2018-10-24 12:35:37,955 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:35:37,955 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 89 [2018-10-24 12:35:37,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:37,956 INFO L225 Difference]: With dead ends: 334 [2018-10-24 12:35:37,956 INFO L226 Difference]: Without dead ends: 293 [2018-10-24 12:35:37,957 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 147 SyntacticMatches, 18 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1724 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=867, Invalid=3689, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:35:37,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2018-10-24 12:35:38,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 115. [2018-10-24 12:35:38,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-24 12:35:38,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-10-24 12:35:38,036 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-10-24 12:35:38,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:38,036 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-10-24 12:35:38,036 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 12:35:38,036 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-10-24 12:35:38,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:35:38,037 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:38,037 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:38,037 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:38,037 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:38,038 INFO L82 PathProgramCache]: Analyzing trace with hash 233315123, now seen corresponding path program 19 times [2018-10-24 12:35:38,038 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:38,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:38,038 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:38,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:38,038 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:38,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:38,365 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 119 proven. 32 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:38,365 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:38,365 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:38,365 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:38,366 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:38,366 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:38,366 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 12:35:38,390 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:38,390 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:38,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:38,416 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:38,683 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 119 proven. 32 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:38,683 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:38,981 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 119 proven. 32 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:39,002 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:39,002 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 34 [2018-10-24 12:35:39,002 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:39,003 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:35:39,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:35:39,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=903, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:35:39,003 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 34 states. [2018-10-24 12:35:40,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:40,120 INFO L93 Difference]: Finished difference Result 374 states and 436 transitions. [2018-10-24 12:35:40,121 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:35:40,121 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 89 [2018-10-24 12:35:40,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:40,123 INFO L225 Difference]: With dead ends: 374 [2018-10-24 12:35:40,123 INFO L226 Difference]: Without dead ends: 333 [2018-10-24 12:35:40,124 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 148 SyntacticMatches, 18 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1696 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=867, Invalid=3689, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:35:40,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2018-10-24 12:35:40,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 115. [2018-10-24 12:35:40,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-24 12:35:40,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-10-24 12:35:40,194 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-10-24 12:35:40,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:40,195 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-10-24 12:35:40,195 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:35:40,195 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-10-24 12:35:40,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:35:40,195 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:40,195 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 6, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:40,195 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:40,196 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:40,196 INFO L82 PathProgramCache]: Analyzing trace with hash 1822167487, now seen corresponding path program 20 times [2018-10-24 12:35:40,196 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:40,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:40,196 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:40,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:40,197 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:40,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:40,520 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 119 proven. 36 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:40,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:40,521 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:40,521 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:40,521 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:40,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:40,521 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 12:35:40,529 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:40,529 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:40,565 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-24 12:35:40,566 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:40,569 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:40,899 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 119 proven. 36 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:40,899 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:41,066 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 119 proven. 36 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:41,087 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:41,087 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 33 [2018-10-24 12:35:41,087 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:41,088 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:35:41,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:35:41,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=845, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:35:41,088 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 33 states. [2018-10-24 12:35:42,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:42,357 INFO L93 Difference]: Finished difference Result 412 states and 483 transitions. [2018-10-24 12:35:42,357 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:35:42,357 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 89 [2018-10-24 12:35:42,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:42,359 INFO L225 Difference]: With dead ends: 412 [2018-10-24 12:35:42,359 INFO L226 Difference]: Without dead ends: 371 [2018-10-24 12:35:42,360 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 149 SyntacticMatches, 18 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1572 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=823, Invalid=3467, Unknown=0, NotChecked=0, Total=4290 [2018-10-24 12:35:42,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2018-10-24 12:35:42,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 115. [2018-10-24 12:35:42,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-24 12:35:42,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-10-24 12:35:42,434 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-10-24 12:35:42,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:42,434 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-10-24 12:35:42,434 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:35:42,434 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-10-24 12:35:42,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:35:42,435 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:42,435 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:42,435 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:42,435 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:42,435 INFO L82 PathProgramCache]: Analyzing trace with hash 1890859851, now seen corresponding path program 21 times [2018-10-24 12:35:42,435 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:42,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:42,436 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:42,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:42,436 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:42,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:42,681 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 119 proven. 44 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:42,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:42,681 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:42,682 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:42,682 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:42,682 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:42,682 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 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 12:35:42,690 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:42,690 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:42,718 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:42,718 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:42,721 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:42,951 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 119 proven. 44 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:42,952 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:43,187 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 119 proven. 44 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:43,207 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:43,207 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2018-10-24 12:35:43,208 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:43,208 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:35:43,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:35:43,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=785, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:35:43,208 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 32 states. [2018-10-24 12:35:44,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:44,679 INFO L93 Difference]: Finished difference Result 448 states and 528 transitions. [2018-10-24 12:35:44,680 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:35:44,680 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 89 [2018-10-24 12:35:44,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:44,682 INFO L225 Difference]: With dead ends: 448 [2018-10-24 12:35:44,682 INFO L226 Difference]: Without dead ends: 407 [2018-10-24 12:35:44,682 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 150 SyntacticMatches, 18 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1354 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=741, Invalid=3041, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:35:44,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 407 states. [2018-10-24 12:35:44,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 407 to 115. [2018-10-24 12:35:44,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-24 12:35:44,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-10-24 12:35:44,766 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-10-24 12:35:44,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:44,767 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-10-24 12:35:44,767 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:35:44,767 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-10-24 12:35:44,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:35:44,767 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:44,767 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:44,768 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:44,768 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:44,768 INFO L82 PathProgramCache]: Analyzing trace with hash 2074171351, now seen corresponding path program 7 times [2018-10-24 12:35:44,768 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:44,768 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:44,768 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:44,768 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:44,768 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:44,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:45,555 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:45,555 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:45,555 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:45,555 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:45,555 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:45,555 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:45,555 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 12:35:45,564 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:45,564 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:45,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:45,593 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:45,823 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:45,823 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:45,952 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:45,973 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:45,973 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 31 [2018-10-24 12:35:45,974 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:45,974 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:35:45,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:35:45,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=723, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:35:45,975 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 31 states. [2018-10-24 12:35:47,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:47,547 INFO L93 Difference]: Finished difference Result 487 states and 577 transitions. [2018-10-24 12:35:47,548 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:35:47,548 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 89 [2018-10-24 12:35:47,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:47,550 INFO L225 Difference]: With dead ends: 487 [2018-10-24 12:35:47,550 INFO L226 Difference]: Without dead ends: 446 [2018-10-24 12:35:47,550 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 151 SyntacticMatches, 18 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1056 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=633, Invalid=2447, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:35:47,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2018-10-24 12:35:47,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 118. [2018-10-24 12:35:47,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-10-24 12:35:47,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 128 transitions. [2018-10-24 12:35:47,676 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 128 transitions. Word has length 89 [2018-10-24 12:35:47,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:47,677 INFO L481 AbstractCegarLoop]: Abstraction has 118 states and 128 transitions. [2018-10-24 12:35:47,677 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:35:47,677 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 128 transitions. [2018-10-24 12:35:47,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-10-24 12:35:47,678 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:47,678 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:47,678 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:47,678 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:47,678 INFO L82 PathProgramCache]: Analyzing trace with hash -1421446787, now seen corresponding path program 14 times [2018-10-24 12:35:47,679 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:47,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:47,679 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:47,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:47,679 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:47,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:48,186 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 85 proven. 124 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-24 12:35:48,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:48,186 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:48,186 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:48,186 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:48,187 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:48,187 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 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 12:35:48,193 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:48,194 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:48,223 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:35:48,223 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:48,226 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:48,302 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:48,303 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:48,437 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:35:48,457 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:48,457 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 16 [2018-10-24 12:35:48,457 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:48,457 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:35:48,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:35:48,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:35:48,458 INFO L87 Difference]: Start difference. First operand 118 states and 128 transitions. Second operand 16 states. [2018-10-24 12:35:48,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:48,791 INFO L93 Difference]: Finished difference Result 128 states and 138 transitions. [2018-10-24 12:35:48,791 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:35:48,791 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 91 [2018-10-24 12:35:48,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:48,793 INFO L225 Difference]: With dead ends: 128 [2018-10-24 12:35:48,793 INFO L226 Difference]: Without dead ends: 126 [2018-10-24 12:35:48,793 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 173 SyntacticMatches, 17 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:35:48,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-10-24 12:35:48,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2018-10-24 12:35:48,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-10-24 12:35:48,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 136 transitions. [2018-10-24 12:35:48,913 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 136 transitions. Word has length 91 [2018-10-24 12:35:48,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:48,913 INFO L481 AbstractCegarLoop]: Abstraction has 126 states and 136 transitions. [2018-10-24 12:35:48,914 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:35:48,914 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 136 transitions. [2018-10-24 12:35:48,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:35:48,914 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:48,915 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:48,915 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:48,915 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:48,915 INFO L82 PathProgramCache]: Analyzing trace with hash -161069919, now seen corresponding path program 15 times [2018-10-24 12:35:48,915 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:48,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:48,916 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:48,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:48,916 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:48,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:49,269 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:35:49,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:49,269 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:49,269 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:49,269 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:49,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:49,269 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 12:35:49,277 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:49,277 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:49,302 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:49,303 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:49,305 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:50,499 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:35:50,500 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:50,669 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:35:50,689 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:50,689 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 42 [2018-10-24 12:35:50,689 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:50,689 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:35:50,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:35:50,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=1369, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:35:50,690 INFO L87 Difference]: Start difference. First operand 126 states and 136 transitions. Second operand 42 states. [2018-10-24 12:35:51,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:51,464 INFO L93 Difference]: Finished difference Result 225 states and 254 transitions. [2018-10-24 12:35:51,465 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:35:51,465 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 99 [2018-10-24 12:35:51,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:51,466 INFO L225 Difference]: With dead ends: 225 [2018-10-24 12:35:51,466 INFO L226 Difference]: Without dead ends: 180 [2018-10-24 12:35:51,468 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 160 SyntacticMatches, 20 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1688 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=763, Invalid=3019, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:35:51,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-10-24 12:35:51,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 128. [2018-10-24 12:35:51,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:35:51,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-10-24 12:35:51,558 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-10-24 12:35:51,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:51,559 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-10-24 12:35:51,559 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:35:51,559 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-10-24 12:35:51,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:35:51,560 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:51,560 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:51,560 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:51,560 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:51,560 INFO L82 PathProgramCache]: Analyzing trace with hash 1635135533, now seen corresponding path program 22 times [2018-10-24 12:35:51,560 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:51,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:51,561 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:51,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:51,561 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:51,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:52,047 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 152 proven. 58 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:35:52,047 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:52,047 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:52,047 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:52,047 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:52,047 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:52,047 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 12:35:52,055 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:52,056 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:52,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:52,089 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:52,438 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 152 proven. 58 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:35:52,439 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:52,620 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 152 proven. 58 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:35:52,640 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:52,640 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 41 [2018-10-24 12:35:52,640 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:52,640 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-24 12:35:52,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-24 12:35:52,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=1314, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:35:52,641 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 41 states. [2018-10-24 12:35:53,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:53,714 INFO L93 Difference]: Finished difference Result 277 states and 316 transitions. [2018-10-24 12:35:53,715 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:35:53,715 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 99 [2018-10-24 12:35:53,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:53,716 INFO L225 Difference]: With dead ends: 277 [2018-10-24 12:35:53,716 INFO L226 Difference]: Without dead ends: 232 [2018-10-24 12:35:53,717 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 161 SyntacticMatches, 20 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1944 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=903, Invalid=3789, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:35:53,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2018-10-24 12:35:53,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 128. [2018-10-24 12:35:53,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:35:53,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-10-24 12:35:53,871 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-10-24 12:35:53,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:53,872 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-10-24 12:35:53,872 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-24 12:35:53,872 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-10-24 12:35:53,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:35:53,873 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:53,873 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 7, 6, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:53,873 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:53,873 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:53,873 INFO L82 PathProgramCache]: Analyzing trace with hash 1382256313, now seen corresponding path program 23 times [2018-10-24 12:35:53,874 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:53,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:53,876 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:53,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:53,877 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:53,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:54,313 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 152 proven. 48 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:35:54,313 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:54,313 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:54,313 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:54,314 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:54,314 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:54,314 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 12:35:54,322 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:54,322 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:54,351 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:35:54,351 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:54,353 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:56,021 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 152 proven. 48 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:35:56,021 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:56,280 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 152 proven. 48 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:35:56,299 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:56,300 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 40 [2018-10-24 12:35:56,300 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:56,300 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-24 12:35:56,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-24 12:35:56,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=1257, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:35:56,301 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 40 states. [2018-10-24 12:35:57,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:57,691 INFO L93 Difference]: Finished difference Result 327 states and 376 transitions. [2018-10-24 12:35:57,691 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:35:57,691 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 99 [2018-10-24 12:35:57,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:57,693 INFO L225 Difference]: With dead ends: 327 [2018-10-24 12:35:57,693 INFO L226 Difference]: Without dead ends: 282 [2018-10-24 12:35:57,694 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 162 SyntacticMatches, 20 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2151 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1018, Invalid=4384, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:35:57,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2018-10-24 12:35:57,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 128. [2018-10-24 12:35:57,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:35:57,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-10-24 12:35:57,798 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-10-24 12:35:57,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:57,798 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-10-24 12:35:57,798 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-24 12:35:57,798 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-10-24 12:35:57,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:35:57,799 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:57,799 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 6, 5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:57,799 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:57,799 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:57,799 INFO L82 PathProgramCache]: Analyzing trace with hash 2012160069, now seen corresponding path program 24 times [2018-10-24 12:35:57,799 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:57,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:57,800 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:57,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:57,800 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:57,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:58,056 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 152 proven. 42 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:35:58,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:58,057 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:58,057 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:58,057 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:58,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:58,057 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 12:35:58,065 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:58,065 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:58,091 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:58,091 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:58,093 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:58,416 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 152 proven. 42 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:35:58,416 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:58,579 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 152 proven. 42 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:35:58,599 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:58,599 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 39 [2018-10-24 12:35:58,599 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:58,600 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:35:58,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:35:58,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=1198, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:35:58,600 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 39 states. [2018-10-24 12:36:00,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:00,135 INFO L93 Difference]: Finished difference Result 375 states and 434 transitions. [2018-10-24 12:36:00,135 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-24 12:36:00,136 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 99 [2018-10-24 12:36:00,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:00,137 INFO L225 Difference]: With dead ends: 375 [2018-10-24 12:36:00,137 INFO L226 Difference]: Without dead ends: 330 [2018-10-24 12:36:00,138 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 163 SyntacticMatches, 20 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2277 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1093, Invalid=4759, Unknown=0, NotChecked=0, Total=5852 [2018-10-24 12:36:00,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2018-10-24 12:36:00,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 128. [2018-10-24 12:36:00,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:36:00,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-10-24 12:36:00,254 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-10-24 12:36:00,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:00,255 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-10-24 12:36:00,255 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:36:00,255 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-10-24 12:36:00,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:36:00,255 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:00,255 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:00,256 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:00,256 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:00,256 INFO L82 PathProgramCache]: Analyzing trace with hash -1173773103, now seen corresponding path program 25 times [2018-10-24 12:36:00,256 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:00,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:00,257 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:00,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:00,257 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:00,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:00,717 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 152 proven. 40 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:36:00,717 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:00,717 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:00,718 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:00,718 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:00,718 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:00,718 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 12:36:00,725 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:00,725 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:00,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:00,753 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:01,198 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 152 proven. 40 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:36:01,199 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:01,398 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 152 proven. 40 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:36:01,418 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:01,418 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 38 [2018-10-24 12:36:01,418 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:01,419 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:36:01,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:36:01,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=1137, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:36:01,419 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 38 states. [2018-10-24 12:36:03,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:03,052 INFO L93 Difference]: Finished difference Result 421 states and 490 transitions. [2018-10-24 12:36:03,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:36:03,052 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 99 [2018-10-24 12:36:03,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:03,054 INFO L225 Difference]: With dead ends: 421 [2018-10-24 12:36:03,054 INFO L226 Difference]: Without dead ends: 376 [2018-10-24 12:36:03,055 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 164 SyntacticMatches, 20 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2302 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1119, Invalid=4887, Unknown=0, NotChecked=0, Total=6006 [2018-10-24 12:36:03,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2018-10-24 12:36:03,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 128. [2018-10-24 12:36:03,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:36:03,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-10-24 12:36:03,175 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-10-24 12:36:03,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:03,175 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-10-24 12:36:03,175 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:36:03,175 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-10-24 12:36:03,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:36:03,176 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:03,176 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 6, 5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:03,176 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:03,176 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:03,177 INFO L82 PathProgramCache]: Analyzing trace with hash -975971235, now seen corresponding path program 26 times [2018-10-24 12:36:03,177 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:03,177 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:03,177 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:03,177 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:03,177 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:03,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:03,453 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 152 proven. 42 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:36:03,453 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:03,453 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:03,453 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:03,453 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:03,453 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:03,454 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 12:36:03,460 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:03,460 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:03,494 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:36:03,494 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:03,497 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:03,829 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 152 proven. 42 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:36:03,829 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:03,986 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 152 proven. 42 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:36:04,006 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:04,006 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 37 [2018-10-24 12:36:04,006 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:04,006 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-24 12:36:04,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-24 12:36:04,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=1074, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:36:04,007 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 37 states. [2018-10-24 12:36:05,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:05,617 INFO L93 Difference]: Finished difference Result 465 states and 544 transitions. [2018-10-24 12:36:05,617 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-24 12:36:05,617 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 99 [2018-10-24 12:36:05,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:05,620 INFO L225 Difference]: With dead ends: 465 [2018-10-24 12:36:05,620 INFO L226 Difference]: Without dead ends: 420 [2018-10-24 12:36:05,621 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 165 SyntacticMatches, 20 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2217 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1093, Invalid=4759, Unknown=0, NotChecked=0, Total=5852 [2018-10-24 12:36:05,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 420 states. [2018-10-24 12:36:05,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 420 to 128. [2018-10-24 12:36:05,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:36:05,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-10-24 12:36:05,739 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-10-24 12:36:05,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:05,739 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-10-24 12:36:05,739 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-24 12:36:05,739 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-10-24 12:36:05,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:36:05,740 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:05,740 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 7, 6, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:05,740 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:05,741 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:05,741 INFO L82 PathProgramCache]: Analyzing trace with hash -1717664023, now seen corresponding path program 27 times [2018-10-24 12:36:05,741 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:05,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:05,742 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:05,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:05,742 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:05,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:06,134 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 152 proven. 48 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:36:06,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:06,135 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:06,135 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:06,135 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:06,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:06,135 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 12:36:06,142 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:06,142 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:06,172 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:06,172 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:06,174 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:06,473 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 152 proven. 48 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:36:06,473 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:06,627 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 152 proven. 48 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:36:06,647 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:06,647 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 36 [2018-10-24 12:36:06,647 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:06,648 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:36:06,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:36:06,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=1009, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:36:06,648 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 36 states. [2018-10-24 12:36:08,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:08,442 INFO L93 Difference]: Finished difference Result 507 states and 596 transitions. [2018-10-24 12:36:08,442 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:36:08,442 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 99 [2018-10-24 12:36:08,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:08,444 INFO L225 Difference]: With dead ends: 507 [2018-10-24 12:36:08,444 INFO L226 Difference]: Without dead ends: 462 [2018-10-24 12:36:08,445 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 166 SyntacticMatches, 20 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2019 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1018, Invalid=4384, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:36:08,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 462 states. [2018-10-24 12:36:08,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 462 to 128. [2018-10-24 12:36:08,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:36:08,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-10-24 12:36:08,579 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-10-24 12:36:08,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:08,579 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-10-24 12:36:08,579 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:36:08,579 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-10-24 12:36:08,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:36:08,579 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:08,580 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:08,580 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:08,580 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:08,580 INFO L82 PathProgramCache]: Analyzing trace with hash 283796597, now seen corresponding path program 28 times [2018-10-24 12:36:08,580 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:08,581 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:08,581 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:08,581 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:08,581 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:08,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:08,917 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 152 proven. 58 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:36:08,918 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:08,918 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:08,918 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:08,918 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:08,918 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:08,918 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 12:36:08,926 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:08,926 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:08,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:08,954 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:09,308 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 152 proven. 58 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:36:09,308 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:09,485 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 152 proven. 58 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:36:09,504 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:09,504 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2018-10-24 12:36:09,504 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:09,505 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 12:36:09,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 12:36:09,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=942, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:36:09,505 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 35 states. [2018-10-24 12:36:11,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:11,206 INFO L93 Difference]: Finished difference Result 547 states and 646 transitions. [2018-10-24 12:36:11,206 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-24 12:36:11,206 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 99 [2018-10-24 12:36:11,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:11,209 INFO L225 Difference]: With dead ends: 547 [2018-10-24 12:36:11,209 INFO L226 Difference]: Without dead ends: 502 [2018-10-24 12:36:11,210 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 167 SyntacticMatches, 20 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1716 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=903, Invalid=3789, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:36:11,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2018-10-24 12:36:11,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 128. [2018-10-24 12:36:11,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:36:11,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-10-24 12:36:11,391 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-10-24 12:36:11,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:11,392 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-10-24 12:36:11,392 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 12:36:11,392 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-10-24 12:36:11,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:36:11,392 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:11,393 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:11,393 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:11,393 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:11,393 INFO L82 PathProgramCache]: Analyzing trace with hash 1885877505, now seen corresponding path program 8 times [2018-10-24 12:36:11,393 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:11,394 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:11,394 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:11,394 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:11,394 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:11,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:11,701 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:36:11,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:11,702 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:11,702 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:11,702 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:11,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:11,702 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 12:36:11,709 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:11,709 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:11,743 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:36:11,743 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:11,745 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:12,078 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:36:12,078 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:12,509 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:36:12,529 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:12,529 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 34 [2018-10-24 12:36:12,529 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:12,529 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:36:12,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:36:12,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=873, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:36:12,530 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 34 states. [2018-10-24 12:36:14,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:14,285 INFO L93 Difference]: Finished difference Result 590 states and 700 transitions. [2018-10-24 12:36:14,286 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:36:14,286 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 99 [2018-10-24 12:36:14,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:14,288 INFO L225 Difference]: With dead ends: 590 [2018-10-24 12:36:14,288 INFO L226 Difference]: Without dead ends: 545 [2018-10-24 12:36:14,290 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 168 SyntacticMatches, 20 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1328 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=763, Invalid=3019, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:36:14,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 545 states. [2018-10-24 12:36:14,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 545 to 131. [2018-10-24 12:36:14,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-10-24 12:36:14,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 142 transitions. [2018-10-24 12:36:14,429 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 142 transitions. Word has length 99 [2018-10-24 12:36:14,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:14,429 INFO L481 AbstractCegarLoop]: Abstraction has 131 states and 142 transitions. [2018-10-24 12:36:14,430 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:36:14,430 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 142 transitions. [2018-10-24 12:36:14,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-24 12:36:14,430 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:14,431 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:14,431 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:14,431 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:14,431 INFO L82 PathProgramCache]: Analyzing trace with hash -1743772005, now seen corresponding path program 16 times [2018-10-24 12:36:14,431 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:14,432 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:14,432 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:14,432 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:14,432 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:14,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:14,638 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 105 proven. 158 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-24 12:36:14,639 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:14,639 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:14,639 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:14,639 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:14,639 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:14,639 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:14,647 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:14,647 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:14,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:14,675 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:14,862 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:36:14,863 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:14,964 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:36:14,984 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:14,984 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 17 [2018-10-24 12:36:14,984 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:14,984 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:36:14,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:36:14,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=194, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:36:14,985 INFO L87 Difference]: Start difference. First operand 131 states and 142 transitions. Second operand 17 states. [2018-10-24 12:36:15,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:15,314 INFO L93 Difference]: Finished difference Result 141 states and 152 transitions. [2018-10-24 12:36:15,315 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:36:15,315 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 101 [2018-10-24 12:36:15,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:15,316 INFO L225 Difference]: With dead ends: 141 [2018-10-24 12:36:15,316 INFO L226 Difference]: Without dead ends: 139 [2018-10-24 12:36:15,317 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 192 SyntacticMatches, 19 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:36:15,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-24 12:36:15,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2018-10-24 12:36:15,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-10-24 12:36:15,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 150 transitions. [2018-10-24 12:36:15,455 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 150 transitions. Word has length 101 [2018-10-24 12:36:15,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:15,455 INFO L481 AbstractCegarLoop]: Abstraction has 139 states and 150 transitions. [2018-10-24 12:36:15,455 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:36:15,455 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 150 transitions. [2018-10-24 12:36:15,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:36:15,456 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:15,456 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:15,456 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:15,456 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:15,456 INFO L82 PathProgramCache]: Analyzing trace with hash -860881985, now seen corresponding path program 17 times [2018-10-24 12:36:15,456 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:15,457 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:15,457 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:15,457 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:15,457 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:15,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:17,361 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:17,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:17,361 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:17,361 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:17,361 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:17,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:17,361 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:17,368 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:17,368 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:17,401 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 12:36:17,401 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:17,404 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:17,880 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:17,881 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:18,095 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:18,115 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:18,115 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 46 [2018-10-24 12:36:18,115 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:18,115 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-24 12:36:18,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-24 12:36:18,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=421, Invalid=1649, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:36:18,116 INFO L87 Difference]: Start difference. First operand 139 states and 150 transitions. Second operand 46 states. [2018-10-24 12:36:18,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:18,983 INFO L93 Difference]: Finished difference Result 248 states and 280 transitions. [2018-10-24 12:36:18,983 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:36:18,983 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 109 [2018-10-24 12:36:18,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:18,984 INFO L225 Difference]: With dead ends: 248 [2018-10-24 12:36:18,984 INFO L226 Difference]: Without dead ends: 199 [2018-10-24 12:36:18,985 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 176 SyntacticMatches, 22 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2081 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=905, Invalid=3651, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:36:18,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-10-24 12:36:19,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 141. [2018-10-24 12:36:19,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:36:19,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-10-24 12:36:19,141 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-10-24 12:36:19,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:19,142 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-10-24 12:36:19,142 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-24 12:36:19,142 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-10-24 12:36:19,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:36:19,142 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:19,142 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 9, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:19,142 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:19,143 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:19,143 INFO L82 PathProgramCache]: Analyzing trace with hash 1311238219, now seen corresponding path program 29 times [2018-10-24 12:36:19,143 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:19,143 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:19,143 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:19,143 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:19,144 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:19,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:19,659 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 189 proven. 74 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:19,659 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:19,659 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:19,659 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:19,659 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:19,659 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:19,659 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 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:19,668 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:19,668 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:19,704 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 12:36:19,704 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:19,707 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:20,178 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 189 proven. 74 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:20,179 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:20,387 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 189 proven. 74 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:20,407 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:20,407 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 45 [2018-10-24 12:36:20,407 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:20,408 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:36:20,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:36:20,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=391, Invalid=1589, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:36:20,408 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 45 states. [2018-10-24 12:36:21,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:21,793 INFO L93 Difference]: Finished difference Result 306 states and 349 transitions. [2018-10-24 12:36:21,794 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:36:21,794 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 109 [2018-10-24 12:36:21,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:21,795 INFO L225 Difference]: With dead ends: 306 [2018-10-24 12:36:21,795 INFO L226 Difference]: Without dead ends: 257 [2018-10-24 12:36:21,796 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 177 SyntacticMatches, 22 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2415 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1081, Invalid=4619, Unknown=0, NotChecked=0, Total=5700 [2018-10-24 12:36:21,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2018-10-24 12:36:21,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 141. [2018-10-24 12:36:21,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:36:21,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-10-24 12:36:21,947 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-10-24 12:36:21,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:21,948 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-10-24 12:36:21,948 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:36:21,948 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-10-24 12:36:21,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:36:21,949 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:21,949 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 8, 7, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:21,949 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:21,949 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:21,949 INFO L82 PathProgramCache]: Analyzing trace with hash 562661335, now seen corresponding path program 30 times [2018-10-24 12:36:21,950 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:21,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:21,950 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:21,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:21,950 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:21,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:22,505 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 189 proven. 62 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:22,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:22,506 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:22,506 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:22,506 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:22,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:22,506 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 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:22,514 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:22,514 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:22,547 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:22,547 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:22,549 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:22,982 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 189 proven. 62 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:22,982 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:23,177 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 189 proven. 62 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:23,197 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:23,197 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 44 [2018-10-24 12:36:23,197 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:23,197 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-24 12:36:23,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-24 12:36:23,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=365, Invalid=1527, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:36:23,198 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 44 states. [2018-10-24 12:36:24,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:24,883 INFO L93 Difference]: Finished difference Result 362 states and 416 transitions. [2018-10-24 12:36:24,884 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:36:24,884 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 109 [2018-10-24 12:36:24,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:24,885 INFO L225 Difference]: With dead ends: 362 [2018-10-24 12:36:24,885 INFO L226 Difference]: Without dead ends: 313 [2018-10-24 12:36:24,886 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 178 SyntacticMatches, 22 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2703 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1234, Invalid=5408, Unknown=0, NotChecked=0, Total=6642 [2018-10-24 12:36:24,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 313 states. [2018-10-24 12:36:25,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 313 to 141. [2018-10-24 12:36:25,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:36:25,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-10-24 12:36:25,076 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-10-24 12:36:25,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:25,076 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-10-24 12:36:25,076 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-24 12:36:25,076 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-10-24 12:36:25,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:36:25,077 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:25,077 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 7, 6, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:25,078 INFO L424 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:25,078 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:25,078 INFO L82 PathProgramCache]: Analyzing trace with hash 195402339, now seen corresponding path program 31 times [2018-10-24 12:36:25,078 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:25,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:25,079 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:25,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:25,079 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:25,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:25,876 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 189 proven. 54 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:25,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:25,876 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:25,877 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:25,877 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:25,877 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:25,877 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 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:25,884 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:25,884 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:25,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:25,922 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:26,390 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 189 proven. 54 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:26,390 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:26,580 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 189 proven. 54 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:26,600 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:26,601 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 43 [2018-10-24 12:36:26,601 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:26,601 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-24 12:36:26,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-24 12:36:26,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=343, Invalid=1463, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:36:26,602 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 43 states. [2018-10-24 12:36:28,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:28,587 INFO L93 Difference]: Finished difference Result 416 states and 481 transitions. [2018-10-24 12:36:28,587 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-24 12:36:28,587 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 109 [2018-10-24 12:36:28,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:28,589 INFO L225 Difference]: With dead ends: 416 [2018-10-24 12:36:28,589 INFO L226 Difference]: Without dead ends: 367 [2018-10-24 12:36:28,590 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 179 SyntacticMatches, 22 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2907 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1346, Invalid=5964, Unknown=0, NotChecked=0, Total=7310 [2018-10-24 12:36:28,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2018-10-24 12:36:28,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 141. [2018-10-24 12:36:28,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:36:28,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-10-24 12:36:28,746 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-10-24 12:36:28,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:28,746 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-10-24 12:36:28,746 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-24 12:36:28,746 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-10-24 12:36:28,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:36:28,747 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:28,747 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 6, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:28,747 INFO L424 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:28,747 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:28,748 INFO L82 PathProgramCache]: Analyzing trace with hash 1316806639, now seen corresponding path program 32 times [2018-10-24 12:36:28,748 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:28,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:28,748 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:28,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:28,749 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:28,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:29,037 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 189 proven. 50 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:29,038 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:29,038 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:29,038 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:29,038 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:29,038 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:29,038 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:29,045 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:29,045 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:29,083 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 12:36:29,084 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:29,086 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:29,461 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 189 proven. 50 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:29,461 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:29,652 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 189 proven. 50 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:29,672 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:29,673 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 42 [2018-10-24 12:36:29,673 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:29,673 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:36:29,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:36:29,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=1397, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:36:29,674 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 42 states. [2018-10-24 12:36:31,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:31,709 INFO L93 Difference]: Finished difference Result 468 states and 544 transitions. [2018-10-24 12:36:31,709 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-24 12:36:31,709 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 109 [2018-10-24 12:36:31,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:31,711 INFO L225 Difference]: With dead ends: 468 [2018-10-24 12:36:31,711 INFO L226 Difference]: Without dead ends: 419 [2018-10-24 12:36:31,712 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 180 SyntacticMatches, 22 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3001 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1405, Invalid=6251, Unknown=0, NotChecked=0, Total=7656 [2018-10-24 12:36:31,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2018-10-24 12:36:31,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 141. [2018-10-24 12:36:31,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:36:31,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-10-24 12:36:31,880 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-10-24 12:36:31,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:31,880 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-10-24 12:36:31,880 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:36:31,880 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-10-24 12:36:31,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:36:31,881 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:31,881 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 6, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:31,882 INFO L424 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:31,882 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:31,882 INFO L82 PathProgramCache]: Analyzing trace with hash 893393019, now seen corresponding path program 33 times [2018-10-24 12:36:31,882 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:31,883 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:31,883 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:31,883 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:31,883 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:31,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:32,203 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 189 proven. 50 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:32,203 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:32,203 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:32,203 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:32,203 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:32,203 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:32,204 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 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:32,228 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:32,228 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:32,282 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:32,282 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:32,285 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:33,049 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 189 proven. 50 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:33,050 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:33,251 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 189 proven. 50 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:33,271 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:33,271 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 41 [2018-10-24 12:36:33,271 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:33,272 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-24 12:36:33,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-24 12:36:33,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=1329, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:36:33,272 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 41 states. [2018-10-24 12:36:34,937 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-10-24 12:36:35,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:35,875 INFO L93 Difference]: Finished difference Result 518 states and 605 transitions. [2018-10-24 12:36:35,875 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-24 12:36:35,875 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 109 [2018-10-24 12:36:35,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:35,877 INFO L225 Difference]: With dead ends: 518 [2018-10-24 12:36:35,877 INFO L226 Difference]: Without dead ends: 469 [2018-10-24 12:36:35,878 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 181 SyntacticMatches, 22 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2971 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1405, Invalid=6251, Unknown=0, NotChecked=0, Total=7656 [2018-10-24 12:36:35,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2018-10-24 12:36:36,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 141. [2018-10-24 12:36:36,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:36:36,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-10-24 12:36:36,030 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-10-24 12:36:36,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:36,030 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-10-24 12:36:36,030 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-24 12:36:36,030 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-10-24 12:36:36,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:36:36,031 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:36,031 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 7, 6, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:36,031 INFO L424 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:36,031 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:36,031 INFO L82 PathProgramCache]: Analyzing trace with hash -1605368825, now seen corresponding path program 34 times [2018-10-24 12:36:36,032 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:36,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:36,032 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:36,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:36,032 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:36,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:36,317 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 189 proven. 54 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:36,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:36,318 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:36,318 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:36,318 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:36,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:36,318 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 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:36,325 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:36,326 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:36,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:36,358 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:36,742 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 189 proven. 54 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:36,743 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:36,926 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 189 proven. 54 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:36,946 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:36,946 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 40 [2018-10-24 12:36:36,946 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:36,947 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-24 12:36:36,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-24 12:36:36,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=1259, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:36:36,947 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 40 states. [2018-10-24 12:36:39,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:39,441 INFO L93 Difference]: Finished difference Result 566 states and 664 transitions. [2018-10-24 12:36:39,441 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-24 12:36:39,441 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 109 [2018-10-24 12:36:39,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:39,443 INFO L225 Difference]: With dead ends: 566 [2018-10-24 12:36:39,443 INFO L226 Difference]: Without dead ends: 517 [2018-10-24 12:36:39,444 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 182 SyntacticMatches, 22 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2811 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1346, Invalid=5964, Unknown=0, NotChecked=0, Total=7310 [2018-10-24 12:36:39,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 517 states. [2018-10-24 12:36:39,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 517 to 141. [2018-10-24 12:36:39,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:36:39,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-10-24 12:36:39,615 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-10-24 12:36:39,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:39,615 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-10-24 12:36:39,615 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-24 12:36:39,615 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-10-24 12:36:39,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:36:39,616 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:39,616 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 8, 7, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:39,616 INFO L424 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:39,616 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:39,617 INFO L82 PathProgramCache]: Analyzing trace with hash -1858248045, now seen corresponding path program 35 times [2018-10-24 12:36:39,617 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:39,617 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:39,617 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:39,617 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:39,617 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:39,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:39,863 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 189 proven. 62 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:39,864 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:39,864 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:39,864 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:39,864 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:39,864 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:39,864 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 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:39,872 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:39,872 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:39,909 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 12:36:39,909 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:39,912 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:40,256 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 189 proven. 62 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:40,256 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:40,458 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 189 proven. 62 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:40,478 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:40,478 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 39 [2018-10-24 12:36:40,478 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:40,478 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:36:40,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:36:40,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=295, Invalid=1187, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:36:40,479 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 39 states. [2018-10-24 12:36:42,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:42,852 INFO L93 Difference]: Finished difference Result 612 states and 721 transitions. [2018-10-24 12:36:42,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-24 12:36:42,852 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 109 [2018-10-24 12:36:42,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:42,855 INFO L225 Difference]: With dead ends: 612 [2018-10-24 12:36:42,855 INFO L226 Difference]: Without dead ends: 563 [2018-10-24 12:36:42,857 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 183 SyntacticMatches, 22 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2523 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1234, Invalid=5408, Unknown=0, NotChecked=0, Total=6642 [2018-10-24 12:36:42,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 563 states. [2018-10-24 12:36:43,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 563 to 141. [2018-10-24 12:36:43,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:36:43,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-10-24 12:36:43,021 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-10-24 12:36:43,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:43,021 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-10-24 12:36:43,021 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:36:43,021 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-10-24 12:36:43,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:36:43,022 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:43,022 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 9, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:43,022 INFO L424 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:43,022 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:43,022 INFO L82 PathProgramCache]: Analyzing trace with hash -1228344289, now seen corresponding path program 36 times [2018-10-24 12:36:43,022 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:43,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:43,023 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:43,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:43,023 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:43,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:43,270 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 189 proven. 74 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:43,270 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:43,270 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:43,271 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:43,271 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:43,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:43,271 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 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:43,285 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:43,285 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:43,337 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:43,337 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:43,340 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:43,659 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 189 proven. 74 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:43,659 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:43,841 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 189 proven. 74 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:43,860 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:43,861 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2018-10-24 12:36:43,861 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:43,861 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:36:43,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:36:43,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=1113, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:36:43,862 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 38 states. [2018-10-24 12:36:46,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:46,253 INFO L93 Difference]: Finished difference Result 656 states and 776 transitions. [2018-10-24 12:36:46,253 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-24 12:36:46,253 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 109 [2018-10-24 12:36:46,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:46,255 INFO L225 Difference]: With dead ends: 656 [2018-10-24 12:36:46,255 INFO L226 Difference]: Without dead ends: 607 [2018-10-24 12:36:46,256 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 184 SyntacticMatches, 22 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2121 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1081, Invalid=4619, Unknown=0, NotChecked=0, Total=5700 [2018-10-24 12:36:46,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2018-10-24 12:36:46,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 141. [2018-10-24 12:36:46,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:36:46,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-10-24 12:36:46,423 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-10-24 12:36:46,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:46,423 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-10-24 12:36:46,423 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:36:46,423 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-10-24 12:36:46,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:36:46,424 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:46,424 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:46,424 INFO L424 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:46,424 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:46,425 INFO L82 PathProgramCache]: Analyzing trace with hash -119310165, now seen corresponding path program 9 times [2018-10-24 12:36:46,425 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:46,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:46,425 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:46,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:46,425 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:46,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:46,668 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:46,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:46,668 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:46,668 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:46,668 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:46,669 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:46,669 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 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:46,680 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:46,680 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:46,708 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:46,708 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:46,710 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:47,030 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:47,031 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:47,230 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:47,251 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:47,251 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 37 [2018-10-24 12:36:47,252 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:47,252 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-24 12:36:47,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-24 12:36:47,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=295, Invalid=1037, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:36:47,253 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 37 states. [2018-10-24 12:36:49,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:49,617 INFO L93 Difference]: Finished difference Result 703 states and 835 transitions. [2018-10-24 12:36:49,617 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:36:49,617 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 109 [2018-10-24 12:36:49,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:49,620 INFO L225 Difference]: With dead ends: 703 [2018-10-24 12:36:49,620 INFO L226 Difference]: Without dead ends: 654 [2018-10-24 12:36:49,621 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 185 SyntacticMatches, 22 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1631 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=905, Invalid=3651, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:36:49,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 654 states. [2018-10-24 12:36:49,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 654 to 144. [2018-10-24 12:36:49,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-10-24 12:36:49,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 156 transitions. [2018-10-24 12:36:49,823 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 156 transitions. Word has length 109 [2018-10-24 12:36:49,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:49,823 INFO L481 AbstractCegarLoop]: Abstraction has 144 states and 156 transitions. [2018-10-24 12:36:49,823 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-24 12:36:49,823 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 156 transitions. [2018-10-24 12:36:49,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-10-24 12:36:49,824 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:49,824 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:49,824 INFO L424 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:49,824 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:49,824 INFO L82 PathProgramCache]: Analyzing trace with hash -1752486599, now seen corresponding path program 18 times [2018-10-24 12:36:49,824 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:49,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:49,825 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:49,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:49,825 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:49,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:49,978 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 127 proven. 196 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-24 12:36:49,978 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:49,978 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:49,979 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:49,979 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:49,979 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:49,979 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:49,987 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:49,987 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:50,019 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:50,019 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:50,021 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:50,052 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:50,052 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:50,185 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:36:50,204 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:50,204 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 18 [2018-10-24 12:36:50,205 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:50,205 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:36:50,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:36:50,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:36:50,205 INFO L87 Difference]: Start difference. First operand 144 states and 156 transitions. Second operand 18 states. [2018-10-24 12:36:50,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:50,678 INFO L93 Difference]: Finished difference Result 154 states and 166 transitions. [2018-10-24 12:36:50,678 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:36:50,678 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 111 [2018-10-24 12:36:50,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:50,679 INFO L225 Difference]: With dead ends: 154 [2018-10-24 12:36:50,680 INFO L226 Difference]: Without dead ends: 152 [2018-10-24 12:36:50,680 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 211 SyntacticMatches, 21 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:36:50,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2018-10-24 12:36:50,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 152. [2018-10-24 12:36:50,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2018-10-24 12:36:50,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 164 transitions. [2018-10-24 12:36:50,862 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 164 transitions. Word has length 111 [2018-10-24 12:36:50,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:50,862 INFO L481 AbstractCegarLoop]: Abstraction has 152 states and 164 transitions. [2018-10-24 12:36:50,862 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:36:50,862 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 164 transitions. [2018-10-24 12:36:50,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:36:50,863 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:50,863 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:50,863 INFO L424 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:50,863 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:50,863 INFO L82 PathProgramCache]: Analyzing trace with hash 1040286813, now seen corresponding path program 19 times [2018-10-24 12:36:50,863 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:50,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:50,864 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:50,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:50,864 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:50,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:51,173 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:36:51,174 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:51,174 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:51,174 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:51,174 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:51,174 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:51,174 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 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:51,182 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:51,182 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:51,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:51,218 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:51,713 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:36:51,714 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:51,977 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:36:51,996 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:51,996 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 50 [2018-10-24 12:36:51,997 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:51,997 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-24 12:36:51,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-24 12:36:51,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=495, Invalid=1955, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:36:51,998 INFO L87 Difference]: Start difference. First operand 152 states and 164 transitions. Second operand 50 states. [2018-10-24 12:36:53,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:53,350 INFO L93 Difference]: Finished difference Result 271 states and 306 transitions. [2018-10-24 12:36:53,350 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:36:53,350 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 119 [2018-10-24 12:36:53,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:53,351 INFO L225 Difference]: With dead ends: 271 [2018-10-24 12:36:53,352 INFO L226 Difference]: Without dead ends: 218 [2018-10-24 12:36:53,352 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 192 SyntacticMatches, 24 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2515 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1059, Invalid=4343, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:36:53,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2018-10-24 12:36:53,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 154. [2018-10-24 12:36:53,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:36:53,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-10-24 12:36:53,562 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-10-24 12:36:53,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:53,562 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-10-24 12:36:53,562 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-24 12:36:53,563 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-10-24 12:36:53,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:36:53,563 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:53,563 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 10, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:53,564 INFO L424 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:53,564 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:53,564 INFO L82 PathProgramCache]: Analyzing trace with hash -661376535, now seen corresponding path program 37 times [2018-10-24 12:36:53,564 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:53,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:53,565 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:53,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:53,565 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:53,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:53,879 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 230 proven. 92 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:36:53,879 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:53,879 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:53,879 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:53,879 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:53,879 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:53,879 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 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:53,889 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:53,889 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:53,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:53,925 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:54,414 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 230 proven. 92 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:36:54,414 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:54,744 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 230 proven. 92 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:36:54,763 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:54,764 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 49 [2018-10-24 12:36:54,764 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:54,764 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-24 12:36:54,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-24 12:36:54,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=462, Invalid=1890, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:36:54,765 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 49 states. [2018-10-24 12:36:56,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:56,472 INFO L93 Difference]: Finished difference Result 335 states and 382 transitions. [2018-10-24 12:36:56,473 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-24 12:36:56,473 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 119 [2018-10-24 12:36:56,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:56,474 INFO L225 Difference]: With dead ends: 335 [2018-10-24 12:36:56,474 INFO L226 Difference]: Without dead ends: 282 [2018-10-24 12:36:56,475 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 193 SyntacticMatches, 24 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2937 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1275, Invalid=5531, Unknown=0, NotChecked=0, Total=6806 [2018-10-24 12:36:56,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2018-10-24 12:36:56,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 154. [2018-10-24 12:36:56,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:36:56,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-10-24 12:36:56,760 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-10-24 12:36:56,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:56,760 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-10-24 12:36:56,760 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-24 12:36:56,761 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-10-24 12:36:56,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:36:56,761 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:56,761 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 9, 8, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:56,761 INFO L424 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:56,762 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:56,762 INFO L82 PathProgramCache]: Analyzing trace with hash 516739701, now seen corresponding path program 38 times [2018-10-24 12:36:56,762 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:56,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:56,762 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:56,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:56,762 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:56,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:57,036 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 230 proven. 78 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:36:57,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:57,037 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:57,037 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:57,037 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:57,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:57,037 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 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:57,044 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:57,044 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:57,084 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-24 12:36:57,085 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:57,088 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:57,626 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 230 proven. 78 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:36:57,626 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:57,864 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 230 proven. 78 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:36:57,884 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:57,884 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 48 [2018-10-24 12:36:57,884 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:57,884 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-24 12:36:57,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-24 12:36:57,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=433, Invalid=1823, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:36:57,885 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 48 states. [2018-10-24 12:37:00,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:00,030 INFO L93 Difference]: Finished difference Result 397 states and 456 transitions. [2018-10-24 12:37:00,031 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:37:00,031 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 119 [2018-10-24 12:37:00,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:00,032 INFO L225 Difference]: With dead ends: 397 [2018-10-24 12:37:00,032 INFO L226 Difference]: Without dead ends: 344 [2018-10-24 12:37:00,033 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 194 SyntacticMatches, 24 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3318 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1471, Invalid=6539, Unknown=0, NotChecked=0, Total=8010 [2018-10-24 12:37:00,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2018-10-24 12:37:00,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 154. [2018-10-24 12:37:00,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:37:00,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-10-24 12:37:00,259 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-10-24 12:37:00,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:00,259 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-10-24 12:37:00,259 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-24 12:37:00,260 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-10-24 12:37:00,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:37:00,260 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:00,260 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 8, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:00,260 INFO L424 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:00,260 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:00,261 INFO L82 PathProgramCache]: Analyzing trace with hash -1752422911, now seen corresponding path program 39 times [2018-10-24 12:37:00,261 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:00,261 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:00,261 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:00,261 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:00,261 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:00,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:00,536 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 230 proven. 68 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:00,536 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:00,536 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:00,536 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:00,536 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:00,536 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:00,536 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 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:00,544 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:37:00,544 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:37:00,580 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:37:00,580 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:00,582 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:01,245 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 230 proven. 68 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:01,246 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:01,501 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 230 proven. 68 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:01,521 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:01,522 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 47 [2018-10-24 12:37:01,522 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:01,522 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-24 12:37:01,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-24 12:37:01,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=1754, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:37:01,523 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 47 states. [2018-10-24 12:37:04,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:04,194 INFO L93 Difference]: Finished difference Result 457 states and 528 transitions. [2018-10-24 12:37:04,195 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-10-24 12:37:04,195 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 119 [2018-10-24 12:37:04,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:04,196 INFO L225 Difference]: With dead ends: 457 [2018-10-24 12:37:04,196 INFO L226 Difference]: Without dead ends: 404 [2018-10-24 12:37:04,197 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 195 SyntacticMatches, 24 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3614 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1626, Invalid=7304, Unknown=0, NotChecked=0, Total=8930 [2018-10-24 12:37:04,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2018-10-24 12:37:04,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 154. [2018-10-24 12:37:04,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:37:04,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-10-24 12:37:04,428 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-10-24 12:37:04,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:04,428 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-10-24 12:37:04,428 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-24 12:37:04,428 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-10-24 12:37:04,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:37:04,428 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:04,428 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 7, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:04,429 INFO L424 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:04,429 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:04,429 INFO L82 PathProgramCache]: Analyzing trace with hash -1964839795, now seen corresponding path program 40 times [2018-10-24 12:37:04,429 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:04,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:04,430 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:04,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:04,430 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:04,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:04,734 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 230 proven. 62 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:04,734 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:04,734 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:04,734 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:04,734 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:04,734 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:04,734 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 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:04,742 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:04,742 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:37:04,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:04,777 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:05,950 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 230 proven. 62 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:05,950 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:06,175 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 230 proven. 62 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:06,196 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:06,197 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 46 [2018-10-24 12:37:06,197 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:06,197 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-24 12:37:06,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-24 12:37:06,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=387, Invalid=1683, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:37:06,198 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 46 states. [2018-10-24 12:37:09,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:09,195 INFO L93 Difference]: Finished difference Result 515 states and 598 transitions. [2018-10-24 12:37:09,195 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-24 12:37:09,195 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 119 [2018-10-24 12:37:09,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:09,198 INFO L225 Difference]: With dead ends: 515 [2018-10-24 12:37:09,198 INFO L226 Difference]: Without dead ends: 462 [2018-10-24 12:37:09,199 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 196 SyntacticMatches, 24 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3793 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1725, Invalid=7781, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:37:09,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 462 states. [2018-10-24 12:37:09,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 462 to 154. [2018-10-24 12:37:09,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:37:09,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-10-24 12:37:09,441 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-10-24 12:37:09,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:09,441 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-10-24 12:37:09,441 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-24 12:37:09,442 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-10-24 12:37:09,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:37:09,442 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:09,442 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:09,443 INFO L424 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:09,443 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:09,443 INFO L82 PathProgramCache]: Analyzing trace with hash -1911429607, now seen corresponding path program 41 times [2018-10-24 12:37:09,443 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:09,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:09,444 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:09,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:09,444 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:09,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:09,738 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 230 proven. 60 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:09,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:09,738 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:09,739 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:09,739 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:09,739 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:09,739 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:09,746 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:37:09,746 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:37:09,788 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-24 12:37:09,788 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:09,790 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:10,464 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 230 proven. 60 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:10,464 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:10,710 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 230 proven. 60 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:10,730 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:10,730 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 45 [2018-10-24 12:37:10,730 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:10,730 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:37:10,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:37:10,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=1610, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:37:10,731 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 45 states. [2018-10-24 12:37:13,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:13,640 INFO L93 Difference]: Finished difference Result 571 states and 666 transitions. [2018-10-24 12:37:13,641 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-10-24 12:37:13,641 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 119 [2018-10-24 12:37:13,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:13,643 INFO L225 Difference]: With dead ends: 571 [2018-10-24 12:37:13,643 INFO L226 Difference]: Without dead ends: 518 [2018-10-24 12:37:13,645 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 197 SyntacticMatches, 24 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3835 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1759, Invalid=7943, Unknown=0, NotChecked=0, Total=9702 [2018-10-24 12:37:13,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2018-10-24 12:37:13,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 154. [2018-10-24 12:37:13,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:37:13,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-10-24 12:37:13,899 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-10-24 12:37:13,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:13,899 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-10-24 12:37:13,899 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:37:13,899 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-10-24 12:37:13,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:37:13,900 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:13,900 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 7, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:13,900 INFO L424 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:13,901 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:13,901 INFO L82 PathProgramCache]: Analyzing trace with hash 260690597, now seen corresponding path program 42 times [2018-10-24 12:37:13,901 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:13,901 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:13,901 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:13,902 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:13,902 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:13,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:14,347 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 230 proven. 62 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:14,348 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:14,348 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:14,348 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:14,348 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:14,348 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:14,348 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 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:14,355 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:37:14,356 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:37:14,391 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:37:14,391 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:14,393 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:14,821 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 230 proven. 62 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:14,821 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:15,042 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 230 proven. 62 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:15,062 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:15,062 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 44 [2018-10-24 12:37:15,062 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:15,062 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-24 12:37:15,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-24 12:37:15,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=1535, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:37:15,063 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 44 states. [2018-10-24 12:37:18,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:18,178 INFO L93 Difference]: Finished difference Result 625 states and 732 transitions. [2018-10-24 12:37:18,179 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-24 12:37:18,179 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 119 [2018-10-24 12:37:18,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:18,181 INFO L225 Difference]: With dead ends: 625 [2018-10-24 12:37:18,181 INFO L226 Difference]: Without dead ends: 572 [2018-10-24 12:37:18,182 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 198 SyntacticMatches, 24 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3731 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1725, Invalid=7781, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:37:18,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2018-10-24 12:37:18,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 154. [2018-10-24 12:37:18,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:37:18,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-10-24 12:37:18,442 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-10-24 12:37:18,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:18,442 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-10-24 12:37:18,442 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-24 12:37:18,442 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-10-24 12:37:18,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:37:18,442 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:18,443 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 8, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:18,443 INFO L424 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:18,443 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:18,443 INFO L82 PathProgramCache]: Analyzing trace with hash -487886287, now seen corresponding path program 43 times [2018-10-24 12:37:18,443 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:18,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:18,444 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:18,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:18,444 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:18,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:18,998 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 230 proven. 68 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:18,998 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:18,999 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:18,999 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:18,999 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:18,999 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:18,999 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 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:19,007 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:19,007 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:37:19,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:19,042 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:19,414 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 230 proven. 68 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:19,415 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:19,638 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 230 proven. 68 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:19,658 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:19,658 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 43 [2018-10-24 12:37:19,658 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:19,658 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-24 12:37:19,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-24 12:37:19,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=348, Invalid=1458, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:37:19,659 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 43 states. [2018-10-24 12:37:22,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:22,886 INFO L93 Difference]: Finished difference Result 677 states and 796 transitions. [2018-10-24 12:37:22,886 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-10-24 12:37:22,886 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 119 [2018-10-24 12:37:22,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:22,888 INFO L225 Difference]: With dead ends: 677 [2018-10-24 12:37:22,888 INFO L226 Difference]: Without dead ends: 624 [2018-10-24 12:37:22,889 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 199 SyntacticMatches, 24 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3478 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1626, Invalid=7304, Unknown=0, NotChecked=0, Total=8930 [2018-10-24 12:37:22,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2018-10-24 12:37:23,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 154. [2018-10-24 12:37:23,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:37:23,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-10-24 12:37:23,120 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-10-24 12:37:23,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:23,120 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-10-24 12:37:23,120 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-24 12:37:23,120 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-10-24 12:37:23,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:37:23,121 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:23,121 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 9, 8, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:23,122 INFO L424 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:23,122 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:23,122 INFO L82 PathProgramCache]: Analyzing trace with hash -855145283, now seen corresponding path program 44 times [2018-10-24 12:37:23,122 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:23,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:23,123 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:23,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:23,123 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:23,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:23,431 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 230 proven. 78 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:23,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:23,431 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:23,431 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:23,431 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:23,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:23,432 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 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:23,438 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:37:23,438 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:37:23,478 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-24 12:37:23,478 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:23,480 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:24,138 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 230 proven. 78 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:24,138 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:24,351 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 230 proven. 78 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:24,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:24,371 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 42 [2018-10-24 12:37:24,371 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:24,371 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:37:24,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:37:24,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=343, Invalid=1379, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:37:24,372 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 42 states. [2018-10-24 12:37:27,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:27,755 INFO L93 Difference]: Finished difference Result 727 states and 858 transitions. [2018-10-24 12:37:27,755 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-24 12:37:27,755 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 119 [2018-10-24 12:37:27,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:27,758 INFO L225 Difference]: With dead ends: 727 [2018-10-24 12:37:27,758 INFO L226 Difference]: Without dead ends: 674 [2018-10-24 12:37:27,760 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 200 SyntacticMatches, 24 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3084 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1471, Invalid=6539, Unknown=0, NotChecked=0, Total=8010 [2018-10-24 12:37:27,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 674 states. [2018-10-24 12:37:28,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 674 to 154. [2018-10-24 12:37:28,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:37:28,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-10-24 12:37:28,008 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-10-24 12:37:28,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:28,008 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-10-24 12:37:28,008 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:37:28,008 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-10-24 12:37:28,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:37:28,009 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:28,009 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 10, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:28,009 INFO L424 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:28,009 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:28,009 INFO L82 PathProgramCache]: Analyzing trace with hash 266259017, now seen corresponding path program 45 times [2018-10-24 12:37:28,009 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:28,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:28,010 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:28,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:28,010 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:28,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:28,279 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 230 proven. 92 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:28,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:28,279 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:28,279 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:28,279 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:28,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:28,280 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:28,296 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:37:28,296 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:37:28,328 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:37:28,328 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:28,330 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:28,694 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 230 proven. 92 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:28,694 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:29,504 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 230 proven. 92 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:29,525 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:29,525 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2018-10-24 12:37:29,525 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:29,525 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-24 12:37:29,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-24 12:37:29,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=342, Invalid=1298, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:37:29,526 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 41 states. [2018-10-24 12:37:32,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:32,789 INFO L93 Difference]: Finished difference Result 775 states and 918 transitions. [2018-10-24 12:37:32,789 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-10-24 12:37:32,789 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 119 [2018-10-24 12:37:32,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:32,792 INFO L225 Difference]: With dead ends: 775 [2018-10-24 12:37:32,792 INFO L226 Difference]: Without dead ends: 722 [2018-10-24 12:37:32,792 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 201 SyntacticMatches, 24 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2569 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1275, Invalid=5531, Unknown=0, NotChecked=0, Total=6806 [2018-10-24 12:37:32,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 722 states. [2018-10-24 12:37:33,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 722 to 154. [2018-10-24 12:37:33,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:37:33,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-10-24 12:37:33,054 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-10-24 12:37:33,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:33,054 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-10-24 12:37:33,054 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-24 12:37:33,054 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-10-24 12:37:33,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:37:33,055 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:33,055 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:33,055 INFO L424 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:33,055 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:33,055 INFO L82 PathProgramCache]: Analyzing trace with hash -157154603, now seen corresponding path program 10 times [2018-10-24 12:37:33,055 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:33,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:33,056 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:33,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:33,056 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:33,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:33,396 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:33,396 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:33,396 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:33,397 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:33,397 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:33,397 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:33,397 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 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:33,403 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:33,403 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:37:33,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:33,436 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:33,786 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:33,786 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:34,341 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:34,361 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:34,361 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 40 [2018-10-24 12:37:34,362 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:34,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-24 12:37:34,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-24 12:37:34,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=345, Invalid=1215, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:37:34,363 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 40 states. [2018-10-24 12:37:37,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:37,588 INFO L93 Difference]: Finished difference Result 826 states and 982 transitions. [2018-10-24 12:37:37,588 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:37:37,588 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 119 [2018-10-24 12:37:37,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:37,591 INFO L225 Difference]: With dead ends: 826 [2018-10-24 12:37:37,591 INFO L226 Difference]: Without dead ends: 773 [2018-10-24 12:37:37,592 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 202 SyntacticMatches, 24 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1965 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1059, Invalid=4343, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:37:37,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 773 states. [2018-10-24 12:37:37,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 773 to 157. [2018-10-24 12:37:37,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-10-24 12:37:37,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 170 transitions. [2018-10-24 12:37:37,864 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 170 transitions. Word has length 119 [2018-10-24 12:37:37,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:37,864 INFO L481 AbstractCegarLoop]: Abstraction has 157 states and 170 transitions. [2018-10-24 12:37:37,864 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-24 12:37:37,865 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 170 transitions. [2018-10-24 12:37:37,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-10-24 12:37:37,865 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:37,865 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:37,866 INFO L424 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:37,866 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:37,866 INFO L82 PathProgramCache]: Analyzing trace with hash 777037143, now seen corresponding path program 20 times [2018-10-24 12:37:37,866 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:37,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:37,867 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:37,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:37,867 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:37,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:38,063 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 151 proven. 238 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-24 12:37:38,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:38,063 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:38,063 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:38,063 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:38,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:38,063 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 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:38,081 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:37:38,081 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:37:38,124 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:37:38,124 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:38,126 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:38,169 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:38,169 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:38,313 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:37:38,333 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:38,333 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 19 [2018-10-24 12:37:38,333 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:38,333 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:37:38,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:37:38,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=239, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:37:38,334 INFO L87 Difference]: Start difference. First operand 157 states and 170 transitions. Second operand 19 states. [2018-10-24 12:37:38,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:38,924 INFO L93 Difference]: Finished difference Result 167 states and 180 transitions. [2018-10-24 12:37:38,924 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:37:38,924 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 121 [2018-10-24 12:37:38,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:38,925 INFO L225 Difference]: With dead ends: 167 [2018-10-24 12:37:38,926 INFO L226 Difference]: Without dead ends: 165 [2018-10-24 12:37:38,926 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 230 SyntacticMatches, 23 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=116, Invalid=304, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:37:38,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2018-10-24 12:37:39,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 165. [2018-10-24 12:37:39,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-10-24 12:37:39,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 178 transitions. [2018-10-24 12:37:39,189 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 178 transitions. Word has length 121 [2018-10-24 12:37:39,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:39,189 INFO L481 AbstractCegarLoop]: Abstraction has 165 states and 178 transitions. [2018-10-24 12:37:39,189 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:37:39,189 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 178 transitions. [2018-10-24 12:37:39,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:37:39,190 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:39,190 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:39,190 INFO L424 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:39,190 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:39,190 INFO L82 PathProgramCache]: Analyzing trace with hash -1277952389, now seen corresponding path program 21 times [2018-10-24 12:37:39,190 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:39,190 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:39,191 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:39,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:39,191 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:39,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:39,708 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:37:39,708 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:39,708 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:39,709 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:39,709 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:39,709 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:39,709 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 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:39,715 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:37:39,715 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:37:39,749 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:37:39,750 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:39,751 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:40,332 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:37:40,332 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:40,599 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:37:40,618 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:40,618 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 54 [2018-10-24 12:37:40,619 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:40,619 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-24 12:37:40,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-24 12:37:40,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=575, Invalid=2287, Unknown=0, NotChecked=0, Total=2862 [2018-10-24 12:37:40,620 INFO L87 Difference]: Start difference. First operand 165 states and 178 transitions. Second operand 54 states. [2018-10-24 12:37:42,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:42,423 INFO L93 Difference]: Finished difference Result 294 states and 332 transitions. [2018-10-24 12:37:42,423 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:37:42,423 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 129 [2018-10-24 12:37:42,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:42,425 INFO L225 Difference]: With dead ends: 294 [2018-10-24 12:37:42,425 INFO L226 Difference]: Without dead ends: 237 [2018-10-24 12:37:42,425 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 208 SyntacticMatches, 26 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2990 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1225, Invalid=5095, Unknown=0, NotChecked=0, Total=6320 [2018-10-24 12:37:42,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2018-10-24 12:37:42,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 167. [2018-10-24 12:37:42,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:37:42,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-10-24 12:37:42,728 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-10-24 12:37:42,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:42,728 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-10-24 12:37:42,728 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-24 12:37:42,728 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-10-24 12:37:42,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:37:42,729 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:42,729 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 11, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:42,729 INFO L424 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:42,729 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:42,729 INFO L82 PathProgramCache]: Analyzing trace with hash -1178325753, now seen corresponding path program 46 times [2018-10-24 12:37:42,730 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:42,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:42,730 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:42,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:42,730 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:42,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:43,083 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 275 proven. 112 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:37:43,083 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:43,084 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:43,084 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:43,084 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:43,084 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:43,084 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 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:43,091 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:43,091 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:37:43,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:43,128 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:43,677 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 275 proven. 112 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:37:43,678 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:43,945 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 275 proven. 112 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:37:43,966 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:43,966 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 53 [2018-10-24 12:37:43,966 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:43,967 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-24 12:37:43,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-24 12:37:43,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=539, Invalid=2217, Unknown=0, NotChecked=0, Total=2756 [2018-10-24 12:37:43,967 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 53 states. [2018-10-24 12:37:46,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:46,338 INFO L93 Difference]: Finished difference Result 364 states and 415 transitions. [2018-10-24 12:37:46,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:37:46,338 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 129 [2018-10-24 12:37:46,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:46,340 INFO L225 Difference]: With dead ends: 364 [2018-10-24 12:37:46,340 INFO L226 Difference]: Without dead ends: 307 [2018-10-24 12:37:46,340 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 209 SyntacticMatches, 26 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3510 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1485, Invalid=6525, Unknown=0, NotChecked=0, Total=8010 [2018-10-24 12:37:46,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2018-10-24 12:37:46,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 167. [2018-10-24 12:37:46,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:37:46,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-10-24 12:37:46,631 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-10-24 12:37:46,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:46,631 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-10-24 12:37:46,631 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-24 12:37:46,631 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-10-24 12:37:46,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:37:46,632 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:46,632 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 10, 9, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:46,632 INFO L424 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:46,632 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:46,633 INFO L82 PathProgramCache]: Analyzing trace with hash -154759533, now seen corresponding path program 47 times [2018-10-24 12:37:46,633 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:46,633 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:46,633 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:46,633 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:46,634 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:46,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:47,210 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 275 proven. 96 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:37:47,210 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:47,210 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:47,210 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:47,210 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:47,211 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:47,211 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 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:47,217 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:37:47,217 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:37:47,261 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:37:47,262 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:47,264 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:47,824 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 275 proven. 96 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:37:47,824 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:48,088 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 275 proven. 96 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:37:48,108 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:48,108 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 52 [2018-10-24 12:37:48,108 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:48,108 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-24 12:37:48,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-24 12:37:48,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=507, Invalid=2145, Unknown=0, NotChecked=0, Total=2652 [2018-10-24 12:37:48,109 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 52 states. [2018-10-24 12:37:51,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:51,122 INFO L93 Difference]: Finished difference Result 432 states and 496 transitions. [2018-10-24 12:37:51,123 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-24 12:37:51,123 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 129 [2018-10-24 12:37:51,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:51,124 INFO L225 Difference]: With dead ends: 432 [2018-10-24 12:37:51,124 INFO L226 Difference]: Without dead ends: 375 [2018-10-24 12:37:51,125 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 210 SyntacticMatches, 26 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3996 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1729, Invalid=7777, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:37:51,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 375 states. [2018-10-24 12:37:51,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 375 to 167. [2018-10-24 12:37:51,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:37:51,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-10-24 12:37:51,425 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-10-24 12:37:51,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:51,425 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-10-24 12:37:51,425 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-24 12:37:51,425 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-10-24 12:37:51,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:37:51,426 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:51,426 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 9, 8, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:51,426 INFO L424 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:51,426 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:51,426 INFO L82 PathProgramCache]: Analyzing trace with hash 1607197471, now seen corresponding path program 48 times [2018-10-24 12:37:51,426 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:51,427 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:51,427 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:51,427 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:51,427 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:51,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:51,768 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 275 proven. 84 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:37:51,768 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:51,769 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:51,769 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:51,769 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:51,769 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:51,769 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 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:51,778 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:37:51,778 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:37:51,814 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:37:51,814 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:51,816 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:52,319 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 275 proven. 84 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:37:52,319 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:52,759 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 275 proven. 84 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:37:52,779 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:52,779 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 51 [2018-10-24 12:37:52,780 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:52,780 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-24 12:37:52,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-24 12:37:52,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=479, Invalid=2071, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:37:52,781 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 51 states. [2018-10-24 12:37:56,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:56,258 INFO L93 Difference]: Finished difference Result 498 states and 575 transitions. [2018-10-24 12:37:56,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-24 12:37:56,259 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 129 [2018-10-24 12:37:56,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:56,260 INFO L225 Difference]: With dead ends: 498 [2018-10-24 12:37:56,260 INFO L226 Difference]: Without dead ends: 441 [2018-10-24 12:37:56,261 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 211 SyntacticMatches, 26 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4398 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1933, Invalid=8779, Unknown=0, NotChecked=0, Total=10712 [2018-10-24 12:37:56,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2018-10-24 12:37:56,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 167. [2018-10-24 12:37:56,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:37:56,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-10-24 12:37:56,598 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-10-24 12:37:56,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:56,598 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-10-24 12:37:56,598 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-24 12:37:56,598 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-10-24 12:37:56,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:37:56,599 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:56,599 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 8, 7, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:56,599 INFO L424 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:56,599 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:56,599 INFO L82 PathProgramCache]: Analyzing trace with hash -285939029, now seen corresponding path program 49 times [2018-10-24 12:37:56,599 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:56,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:56,600 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:56,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:56,600 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:56,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:57,050 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 275 proven. 76 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:37:57,051 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:57,051 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:57,051 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:57,051 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:57,051 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:57,051 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:57,059 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:57,059 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:37:57,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:57,098 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:57,591 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 275 proven. 76 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:37:57,591 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:57,889 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 275 proven. 76 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:37:57,908 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:57,908 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 50 [2018-10-24 12:37:57,909 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:57,909 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-24 12:37:57,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-24 12:37:57,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=455, Invalid=1995, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:37:57,910 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 50 states. [2018-10-24 12:38:01,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:01,636 INFO L93 Difference]: Finished difference Result 562 states and 652 transitions. [2018-10-24 12:38:01,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-24 12:38:01,636 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 129 [2018-10-24 12:38:01,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:01,638 INFO L225 Difference]: With dead ends: 562 [2018-10-24 12:38:01,638 INFO L226 Difference]: Without dead ends: 505 [2018-10-24 12:38:01,639 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 212 SyntacticMatches, 26 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4678 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2079, Invalid=9477, Unknown=0, NotChecked=0, Total=11556 [2018-10-24 12:38:01,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2018-10-24 12:38:01,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 167. [2018-10-24 12:38:01,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:38:01,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-10-24 12:38:01,961 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-10-24 12:38:01,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:01,961 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-10-24 12:38:01,961 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-24 12:38:01,961 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-10-24 12:38:01,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:38:01,962 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:01,962 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 7, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:01,962 INFO L424 AbstractCegarLoop]: === Iteration 84 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:01,962 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:01,963 INFO L82 PathProgramCache]: Analyzing trace with hash 798123319, now seen corresponding path program 50 times [2018-10-24 12:38:01,963 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:01,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:01,963 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:01,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:01,964 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:01,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:02,271 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 275 proven. 72 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:38:02,272 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:02,272 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:02,272 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:02,272 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:02,272 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:02,272 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 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:02,280 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:02,280 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:02,326 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:38:02,326 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:02,328 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:02,826 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 275 proven. 72 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:38:02,826 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:03,085 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 275 proven. 72 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:38:03,105 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:03,105 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 49 [2018-10-24 12:38:03,105 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:03,106 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-24 12:38:03,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-24 12:38:03,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=1917, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:38:03,106 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 49 states. [2018-10-24 12:38:07,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:07,140 INFO L93 Difference]: Finished difference Result 624 states and 727 transitions. [2018-10-24 12:38:07,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-24 12:38:07,140 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 129 [2018-10-24 12:38:07,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:07,142 INFO L225 Difference]: With dead ends: 624 [2018-10-24 12:38:07,142 INFO L226 Difference]: Without dead ends: 567 [2018-10-24 12:38:07,143 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 213 SyntacticMatches, 26 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4810 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2155, Invalid=9835, Unknown=0, NotChecked=0, Total=11990 [2018-10-24 12:38:07,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 567 states. [2018-10-24 12:38:07,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 567 to 167. [2018-10-24 12:38:07,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:38:07,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-10-24 12:38:07,493 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-10-24 12:38:07,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:07,493 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-10-24 12:38:07,493 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-24 12:38:07,493 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-10-24 12:38:07,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:38:07,494 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:07,494 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 7, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:07,494 INFO L424 AbstractCegarLoop]: === Iteration 85 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:07,494 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:07,495 INFO L82 PathProgramCache]: Analyzing trace with hash -903540029, now seen corresponding path program 51 times [2018-10-24 12:38:07,495 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:07,495 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:07,495 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:07,496 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:07,496 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:07,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:07,808 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 275 proven. 72 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:38:07,808 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:07,808 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:07,809 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:07,809 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:07,809 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:07,809 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 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:07,818 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:07,818 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:07,852 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:07,852 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:07,854 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:08,442 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 275 proven. 72 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:38:08,442 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:08,693 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 275 proven. 72 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:38:08,712 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:08,713 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 48 [2018-10-24 12:38:08,713 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:08,713 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-24 12:38:08,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-24 12:38:08,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=1837, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:38:08,714 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 48 states. [2018-10-24 12:38:13,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:13,052 INFO L93 Difference]: Finished difference Result 684 states and 800 transitions. [2018-10-24 12:38:13,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-10-24 12:38:13,052 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 129 [2018-10-24 12:38:13,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:13,054 INFO L225 Difference]: With dead ends: 684 [2018-10-24 12:38:13,055 INFO L226 Difference]: Without dead ends: 627 [2018-10-24 12:38:13,056 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 214 SyntacticMatches, 26 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4780 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2155, Invalid=9835, Unknown=0, NotChecked=0, Total=11990 [2018-10-24 12:38:13,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 627 states. [2018-10-24 12:38:13,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 627 to 167. [2018-10-24 12:38:13,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:38:13,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-10-24 12:38:13,678 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-10-24 12:38:13,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:13,678 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-10-24 12:38:13,678 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-24 12:38:13,678 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-10-24 12:38:13,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:38:13,679 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:13,679 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 8, 7, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:13,679 INFO L424 AbstractCegarLoop]: === Iteration 86 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:13,679 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:13,680 INFO L82 PathProgramCache]: Analyzing trace with hash 274576207, now seen corresponding path program 52 times [2018-10-24 12:38:13,680 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:13,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:13,680 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:13,681 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:13,681 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:13,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:14,261 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 275 proven. 76 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:38:14,262 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:14,262 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:14,262 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:14,262 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:14,262 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:14,262 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 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:14,270 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:14,270 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:14,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:14,309 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:14,763 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 275 proven. 76 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:38:14,764 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:15,350 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 275 proven. 76 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:38:15,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:15,372 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 47 [2018-10-24 12:38:15,372 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:15,372 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-24 12:38:15,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-24 12:38:15,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=407, Invalid=1755, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:38:15,373 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 47 states. [2018-10-24 12:38:19,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:19,803 INFO L93 Difference]: Finished difference Result 742 states and 871 transitions. [2018-10-24 12:38:19,803 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-10-24 12:38:19,803 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 129 [2018-10-24 12:38:19,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:19,806 INFO L225 Difference]: With dead ends: 742 [2018-10-24 12:38:19,806 INFO L226 Difference]: Without dead ends: 685 [2018-10-24 12:38:19,807 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 215 SyntacticMatches, 26 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4582 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2079, Invalid=9477, Unknown=0, NotChecked=0, Total=11556 [2018-10-24 12:38:19,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 685 states. [2018-10-24 12:38:20,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 685 to 167. [2018-10-24 12:38:20,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:38:20,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-10-24 12:38:20,163 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-10-24 12:38:20,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:20,163 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-10-24 12:38:20,163 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-24 12:38:20,163 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-10-24 12:38:20,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:38:20,164 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:20,164 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 9, 8, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:20,164 INFO L424 AbstractCegarLoop]: === Iteration 87 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:20,164 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:20,164 INFO L82 PathProgramCache]: Analyzing trace with hash -1994586405, now seen corresponding path program 53 times [2018-10-24 12:38:20,164 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:20,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:20,165 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:20,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:20,165 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:20,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:20,802 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 275 proven. 84 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:38:20,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:20,803 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:20,803 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:20,803 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:20,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:20,803 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 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:20,811 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:20,811 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:20,857 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:38:20,858 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:20,861 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:21,315 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 275 proven. 84 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:38:21,315 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:21,651 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 275 proven. 84 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:38:21,671 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:21,671 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 46 [2018-10-24 12:38:21,671 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:21,672 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-24 12:38:21,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-24 12:38:21,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=399, Invalid=1671, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:38:21,672 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 46 states. [2018-10-24 12:38:26,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:26,552 INFO L93 Difference]: Finished difference Result 798 states and 940 transitions. [2018-10-24 12:38:26,553 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-24 12:38:26,553 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 129 [2018-10-24 12:38:26,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:26,555 INFO L225 Difference]: With dead ends: 798 [2018-10-24 12:38:26,555 INFO L226 Difference]: Without dead ends: 741 [2018-10-24 12:38:26,556 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 216 SyntacticMatches, 26 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4218 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1933, Invalid=8779, Unknown=0, NotChecked=0, Total=10712 [2018-10-24 12:38:26,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 741 states. [2018-10-24 12:38:26,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 741 to 167. [2018-10-24 12:38:26,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:38:26,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-10-24 12:38:26,904 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-10-24 12:38:26,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:26,904 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-10-24 12:38:26,904 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-24 12:38:26,904 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-10-24 12:38:26,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:38:26,905 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:26,905 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 10, 9, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:26,905 INFO L424 AbstractCegarLoop]: === Iteration 88 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:26,905 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:26,905 INFO L82 PathProgramCache]: Analyzing trace with hash 2087964007, now seen corresponding path program 54 times [2018-10-24 12:38:26,905 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:26,906 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:26,906 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:26,906 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:26,906 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:26,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:27,229 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 275 proven. 96 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:38:27,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:27,230 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:27,230 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:27,230 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:27,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:27,230 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 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:27,239 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:27,240 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:27,277 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:27,277 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:27,281 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:27,698 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 275 proven. 96 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:38:27,699 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:27,946 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 275 proven. 96 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:38:27,966 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:27,966 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 45 [2018-10-24 12:38:27,966 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:27,967 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:38:27,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:38:27,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=1585, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:38:27,967 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 45 states. [2018-10-24 12:38:32,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:32,668 INFO L93 Difference]: Finished difference Result 852 states and 1007 transitions. [2018-10-24 12:38:32,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-24 12:38:32,669 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 129 [2018-10-24 12:38:32,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:32,672 INFO L225 Difference]: With dead ends: 852 [2018-10-24 12:38:32,673 INFO L226 Difference]: Without dead ends: 795 [2018-10-24 12:38:32,673 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 217 SyntacticMatches, 26 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3702 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1729, Invalid=7777, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:38:32,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 795 states. [2018-10-24 12:38:33,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 795 to 167. [2018-10-24 12:38:33,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:38:33,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-10-24 12:38:33,050 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-10-24 12:38:33,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:33,050 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-10-24 12:38:33,050 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:38:33,050 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-10-24 12:38:33,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:38:33,051 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:33,051 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 11, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:33,051 INFO L424 AbstractCegarLoop]: === Iteration 89 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:33,051 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:33,051 INFO L82 PathProgramCache]: Analyzing trace with hash 2141374195, now seen corresponding path program 55 times [2018-10-24 12:38:33,051 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:33,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:33,052 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:33,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:33,052 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:33,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:33,374 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 275 proven. 112 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:38:33,374 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:33,374 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:33,375 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:33,375 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:33,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:33,375 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 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:33,384 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:33,384 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:33,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:33,420 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:33,817 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 275 proven. 112 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:38:33,817 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:34,065 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 275 proven. 112 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:38:34,085 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:34,085 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 44 [2018-10-24 12:38:34,085 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:34,086 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-24 12:38:34,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-24 12:38:34,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=1497, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:38:34,086 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 44 states. [2018-10-24 12:38:37,665 WARN L179 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 14 Received shutdown request... [2018-10-24 12:38:37,857 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-24 12:38:37,857 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-24 12:38:37,864 WARN L205 ceAbstractionStarter]: Timeout [2018-10-24 12:38:37,865 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:38:37 BoogieIcfgContainer [2018-10-24 12:38:37,865 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:38:37,866 INFO L168 Benchmark]: Toolchain (without parser) took 237004.03 ms. Allocated memory was 1.5 GB in the beginning and 2.1 GB in the end (delta: 621.8 MB). Free memory was 1.4 GB in the beginning and 1.6 GB in the end (delta: -234.4 MB). Peak memory consumption was 387.4 MB. Max. memory is 7.1 GB. [2018-10-24 12:38:37,867 INFO L168 Benchmark]: CDTParser took 0.20 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 12:38:37,873 INFO L168 Benchmark]: CACSL2BoogieTranslator took 259.51 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 12:38:37,873 INFO L168 Benchmark]: Boogie Procedure Inliner took 22.14 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 12:38:37,874 INFO L168 Benchmark]: Boogie Preprocessor took 34.06 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 12:38:37,874 INFO L168 Benchmark]: RCFGBuilder took 512.93 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 726.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -765.6 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. [2018-10-24 12:38:37,874 INFO L168 Benchmark]: TraceAbstraction took 236170.87 ms. Allocated memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: -104.3 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 520.6 MB). Peak memory consumption was 416.3 MB. Max. memory is 7.1 GB. [2018-10-24 12:38:37,880 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 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 259.51 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 22.14 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 34.06 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 512.93 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 726.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -765.6 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 236170.87 ms. Allocated memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: -104.3 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 520.6 MB). Peak memory consumption was 416.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was constructing difference of abstraction (167states) and FLOYD_HOARE automaton (currently 50 states, 44 states before enhancement),while ReachableStatesComputation was computing reachable states (295 states constructedinput type IntersectNwa). - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. TIMEOUT Result, 236.1s OverallTime, 89 OverallIterations, 12 TraceHistogramMax, 135.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 4242 SDtfs, 11573 SDslu, 35596 SDs, 0 SdLazy, 32401 SolverSat, 7608 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 32.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 19843 GetRequests, 13134 SyntacticMatches, 1566 SemanticMatches, 5143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152011 ImplicationChecksByTransitivity, 118.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=167occurred in iteration=79, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.6s AbstIntTime, 3 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 11.4s AutomataMinimizationTime, 88 MinimizatonAttempts, 16662 StatesRemovedByMinimization, 77 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.4s SsaConstructionTime, 2.8s SatisfiabilityAnalysisTime, 81.6s InterpolantComputationTime, 15685 NumberOfCodeBlocks, 15685 NumberOfCodeBlocksAsserted, 406 NumberOfCheckSat, 23238 ConstructedInterpolants, 0 QuantifiedInterpolants, 9284136 SizeOfPredicates, 552 NumberOfNonLiveVariables, 16866 ConjunctsInSsa, 1768 ConjunctsInUnsatCore, 261 InterpolantComputations, 3 PerfectInterpolantSequences, 62452/76688 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown