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-INT.epf -i ../../../trunk/examples/svcomp/loop-invgen/string_concat-noarr_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 15:39:06,201 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 15:39:06,203 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 15:39:06,215 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 15:39:06,215 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 15:39:06,216 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 15:39:06,217 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 15:39:06,219 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 15:39:06,221 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 15:39:06,222 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 15:39:06,223 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 15:39:06,223 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 15:39:06,224 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 15:39:06,225 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 15:39:06,226 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 15:39:06,226 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 15:39:06,227 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 15:39:06,229 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 15:39:06,231 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 15:39:06,233 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 15:39:06,234 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 15:39:06,235 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 15:39:06,238 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 15:39:06,238 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 15:39:06,239 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 15:39:06,240 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 15:39:06,241 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 15:39:06,241 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 15:39:06,242 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 15:39:06,244 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 15:39:06,244 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 15:39:06,245 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-27 15:39:06,250 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf [2018-10-27 15:39:06,284 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 15:39:06,285 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 15:39:06,285 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 15:39:06,286 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 15:39:06,286 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 15:39:06,286 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 15:39:06,286 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 15:39:06,286 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 15:39:06,287 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 15:39:06,287 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 15:39:06,287 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 15:39:06,287 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 15:39:06,288 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 15:39:06,288 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 15:39:06,288 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 15:39:06,288 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 15:39:06,288 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 15:39:06,289 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 15:39:06,289 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 15:39:06,289 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 15:39:06,290 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 15:39:06,290 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 15:39:06,290 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 15:39:06,290 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 15:39:06,290 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 15:39:06,291 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 15:39:06,294 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 15:39:06,294 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 15:39:06,294 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 15:39:06,294 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 15:39:06,294 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 15:39:06,295 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 15:39:06,295 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 15:39:06,295 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 15:39:06,339 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 15:39:06,353 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 15:39:06,357 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 15:39:06,359 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 15:39:06,359 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 15:39:06,360 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-invgen/string_concat-noarr_true-unreach-call_true-termination.i [2018-10-27 15:39:06,422 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/05823d2c3/68ab7ecf731d41b1a8ba5c86858bc946/FLAG100b44ba1 [2018-10-27 15:39:06,812 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 15:39:06,813 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/string_concat-noarr_true-unreach-call_true-termination.i [2018-10-27 15:39:06,819 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/05823d2c3/68ab7ecf731d41b1a8ba5c86858bc946/FLAG100b44ba1 [2018-10-27 15:39:06,834 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/05823d2c3/68ab7ecf731d41b1a8ba5c86858bc946 [2018-10-27 15:39:06,845 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 15:39:06,846 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 15:39:06,847 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 15:39:06,848 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 15:39:06,851 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 15:39:06,852 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 03:39:06" (1/1) ... [2018-10-27 15:39:06,855 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ad33cd2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:39:06, skipping insertion in model container [2018-10-27 15:39:06,855 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 03:39:06" (1/1) ... [2018-10-27 15:39:06,865 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 15:39:06,887 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 15:39:07,093 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 15:39:07,097 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 15:39:07,115 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 15:39:07,131 INFO L193 MainTranslator]: Completed translation [2018-10-27 15:39:07,131 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:39:07 WrapperNode [2018-10-27 15:39:07,131 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 15:39:07,132 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 15:39:07,133 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 15:39:07,133 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 15:39:07,142 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:39:07" (1/1) ... [2018-10-27 15:39:07,148 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:39:07" (1/1) ... [2018-10-27 15:39:07,154 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 15:39:07,155 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 15:39:07,155 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 15:39:07,155 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 15:39:07,165 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:39:07" (1/1) ... [2018-10-27 15:39:07,165 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:39:07" (1/1) ... [2018-10-27 15:39:07,166 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:39:07" (1/1) ... [2018-10-27 15:39:07,166 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:39:07" (1/1) ... [2018-10-27 15:39:07,170 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:39:07" (1/1) ... [2018-10-27 15:39:07,175 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:39:07" (1/1) ... [2018-10-27 15:39:07,177 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:39:07" (1/1) ... [2018-10-27 15:39:07,178 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 15:39:07,179 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 15:39:07,179 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 15:39:07,179 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 15:39:07,180 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:39:07" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 15:39:07,330 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 15:39:07,330 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 15:39:07,330 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 15:39:07,333 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 15:39:07,334 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 15:39:07,334 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 15:39:07,334 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 15:39:07,334 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 15:39:07,625 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 15:39:07,626 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 03:39:07 BoogieIcfgContainer [2018-10-27 15:39:07,626 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 15:39:07,627 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 15:39:07,627 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 15:39:07,630 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 15:39:07,630 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 03:39:06" (1/3) ... [2018-10-27 15:39:07,631 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46adf69 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 03:39:07, skipping insertion in model container [2018-10-27 15:39:07,631 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:39:07" (2/3) ... [2018-10-27 15:39:07,632 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46adf69 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 03:39:07, skipping insertion in model container [2018-10-27 15:39:07,632 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 03:39:07" (3/3) ... [2018-10-27 15:39:07,634 INFO L112 eAbstractionObserver]: Analyzing ICFG string_concat-noarr_true-unreach-call_true-termination.i [2018-10-27 15:39:07,643 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 15:39:07,650 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 15:39:07,667 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 15:39:07,701 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 15:39:07,701 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 15:39:07,702 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 15:39:07,702 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 15:39:07,702 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 15:39:07,702 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 15:39:07,702 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 15:39:07,703 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 15:39:07,721 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2018-10-27 15:39:07,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-27 15:39:07,727 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:07,728 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:07,730 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:07,736 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:07,736 INFO L82 PathProgramCache]: Analyzing trace with hash -745796184, now seen corresponding path program 1 times [2018-10-27 15:39:07,739 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:07,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:07,786 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:07,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:07,786 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:07,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:07,837 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:07,839 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 15:39:07,840 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 15:39:07,840 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:39:07,844 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 15:39:07,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 15:39:07,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 15:39:07,863 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2018-10-27 15:39:07,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:07,889 INFO L93 Difference]: Finished difference Result 45 states and 54 transitions. [2018-10-27 15:39:07,889 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 15:39:07,890 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 14 [2018-10-27 15:39:07,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:07,900 INFO L225 Difference]: With dead ends: 45 [2018-10-27 15:39:07,901 INFO L226 Difference]: Without dead ends: 19 [2018-10-27 15:39:07,904 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 15:39:07,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-27 15:39:07,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-27 15:39:07,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-27 15:39:07,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-10-27 15:39:07,945 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2018-10-27 15:39:07,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:07,945 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-10-27 15:39:07,945 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 15:39:07,945 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-10-27 15:39:07,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-27 15:39:07,949 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:07,949 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:07,950 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:07,950 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:07,950 INFO L82 PathProgramCache]: Analyzing trace with hash 800081396, now seen corresponding path program 1 times [2018-10-27 15:39:07,951 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:07,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:07,954 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:07,954 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:07,954 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:07,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:08,186 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:08,187 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 15:39:08,187 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-27 15:39:08,187 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:39:08,189 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 15:39:08,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 15:39:08,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-27 15:39:08,190 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 5 states. [2018-10-27 15:39:08,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:08,322 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2018-10-27 15:39:08,322 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 15:39:08,322 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2018-10-27 15:39:08,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:08,324 INFO L225 Difference]: With dead ends: 32 [2018-10-27 15:39:08,324 INFO L226 Difference]: Without dead ends: 26 [2018-10-27 15:39:08,325 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-27 15:39:08,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-27 15:39:08,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-27 15:39:08,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-27 15:39:08,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2018-10-27 15:39:08,331 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 18 [2018-10-27 15:39:08,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:08,331 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2018-10-27 15:39:08,331 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 15:39:08,331 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2018-10-27 15:39:08,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-27 15:39:08,332 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:08,333 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:08,333 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:08,333 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:08,334 INFO L82 PathProgramCache]: Analyzing trace with hash 1097925811, now seen corresponding path program 1 times [2018-10-27 15:39:08,334 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:08,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:08,335 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:08,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:08,335 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:08,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:08,437 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-27 15:39:08,437 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 15:39:08,437 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-27 15:39:08,437 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:39:08,438 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 15:39:08,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 15:39:08,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-27 15:39:08,439 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 5 states. [2018-10-27 15:39:08,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:08,629 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2018-10-27 15:39:08,630 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 15:39:08,631 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 21 [2018-10-27 15:39:08,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:08,632 INFO L225 Difference]: With dead ends: 35 [2018-10-27 15:39:08,632 INFO L226 Difference]: Without dead ends: 29 [2018-10-27 15:39:08,633 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-27 15:39:08,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-27 15:39:08,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 22. [2018-10-27 15:39:08,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-27 15:39:08,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2018-10-27 15:39:08,642 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 21 [2018-10-27 15:39:08,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:08,642 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2018-10-27 15:39:08,642 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 15:39:08,643 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2018-10-27 15:39:08,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-27 15:39:08,643 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:08,644 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:08,644 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:08,644 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:08,644 INFO L82 PathProgramCache]: Analyzing trace with hash -278190259, now seen corresponding path program 1 times [2018-10-27 15:39:08,644 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:08,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:08,646 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:08,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:08,646 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:08,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:08,795 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:08,795 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:08,795 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:08,797 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-10-27 15:39:08,798 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [10], [12], [15], [26], [30], [32], [35], [37], [45], [49], [52], [54], [60], [61], [62], [64] [2018-10-27 15:39:08,841 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-10-27 15:39:08,842 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 15:39:09,090 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 15:39:09,092 INFO L272 AbstractInterpreter]: Visited 19 different actions 92 times. Merged at 5 different actions 43 times. Widened at 1 different actions 5 times. Found 3 fixpoints after 2 different actions. Largest state had 6 variables. [2018-10-27 15:39:09,127 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:09,128 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 15:39:09,128 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:09,129 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:09,137 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:09,138 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:39:09,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:09,162 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:09,261 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:09,262 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:09,407 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:09,429 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:09,430 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2018-10-27 15:39:09,430 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:09,430 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 15:39:09,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 15:39:09,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2018-10-27 15:39:09,431 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 8 states. [2018-10-27 15:39:09,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:09,668 INFO L93 Difference]: Finished difference Result 63 states and 70 transitions. [2018-10-27 15:39:09,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 15:39:09,669 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-10-27 15:39:09,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:09,671 INFO L225 Difference]: With dead ends: 63 [2018-10-27 15:39:09,671 INFO L226 Difference]: Without dead ends: 53 [2018-10-27 15:39:09,672 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-10-27 15:39:09,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-10-27 15:39:09,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 39. [2018-10-27 15:39:09,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-27 15:39:09,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2018-10-27 15:39:09,680 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 21 [2018-10-27 15:39:09,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:09,681 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2018-10-27 15:39:09,681 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 15:39:09,681 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2018-10-27 15:39:09,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-27 15:39:09,682 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:09,682 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:09,683 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:09,683 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:09,683 INFO L82 PathProgramCache]: Analyzing trace with hash -2006845708, now seen corresponding path program 1 times [2018-10-27 15:39:09,683 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:09,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:09,685 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:09,685 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:09,685 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:09,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:09,832 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:09,832 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:09,833 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:09,833 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 31 with the following transitions: [2018-10-27 15:39:09,833 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [10], [12], [15], [17], [26], [30], [32], [35], [37], [45], [49], [52], [54], [60], [61], [62], [64] [2018-10-27 15:39:09,835 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-10-27 15:39:09,835 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 15:39:10,047 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 15:39:10,047 INFO L272 AbstractInterpreter]: Visited 20 different actions 156 times. Merged at 10 different actions 89 times. Widened at 3 different actions 11 times. Found 13 fixpoints after 4 different actions. Largest state had 7 variables. [2018-10-27 15:39:10,055 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:10,055 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 15:39:10,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:10,055 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:10,066 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:10,067 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:39:10,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:10,097 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:10,156 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:10,157 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:10,611 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:10,632 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:10,632 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-27 15:39:10,632 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:10,633 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 15:39:10,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 15:39:10,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=164, Unknown=0, NotChecked=0, Total=240 [2018-10-27 15:39:10,634 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 9 states. [2018-10-27 15:39:10,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:10,761 INFO L93 Difference]: Finished difference Result 75 states and 81 transitions. [2018-10-27 15:39:10,761 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 15:39:10,761 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 30 [2018-10-27 15:39:10,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:10,764 INFO L225 Difference]: With dead ends: 75 [2018-10-27 15:39:10,764 INFO L226 Difference]: Without dead ends: 69 [2018-10-27 15:39:10,766 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=82, Invalid=190, Unknown=0, NotChecked=0, Total=272 [2018-10-27 15:39:10,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-27 15:39:10,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 46. [2018-10-27 15:39:10,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-27 15:39:10,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2018-10-27 15:39:10,773 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 30 [2018-10-27 15:39:10,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:10,773 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2018-10-27 15:39:10,773 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 15:39:10,774 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2018-10-27 15:39:10,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-27 15:39:10,775 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:10,775 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:10,775 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:10,775 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:10,776 INFO L82 PathProgramCache]: Analyzing trace with hash 750227251, now seen corresponding path program 2 times [2018-10-27 15:39:10,776 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:10,777 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:10,777 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:10,777 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:10,777 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:10,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:10,976 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:10,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:10,976 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:10,976 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:10,977 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:10,977 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:10,977 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:10,996 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:39:10,996 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:39:11,034 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 15:39:11,035 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:39:11,037 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:11,157 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-10-27 15:39:11,157 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:11,397 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-10-27 15:39:11,418 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:11,419 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7, 7] total 18 [2018-10-27 15:39:11,419 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:11,419 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 15:39:11,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 15:39:11,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=205, Unknown=0, NotChecked=0, Total=306 [2018-10-27 15:39:11,420 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 13 states. [2018-10-27 15:39:11,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:11,731 INFO L93 Difference]: Finished difference Result 112 states and 125 transitions. [2018-10-27 15:39:11,734 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 15:39:11,735 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2018-10-27 15:39:11,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:11,736 INFO L225 Difference]: With dead ends: 112 [2018-10-27 15:39:11,737 INFO L226 Difference]: Without dead ends: 100 [2018-10-27 15:39:11,737 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=107, Invalid=235, Unknown=0, NotChecked=0, Total=342 [2018-10-27 15:39:11,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-27 15:39:11,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 70. [2018-10-27 15:39:11,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-10-27 15:39:11,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 77 transitions. [2018-10-27 15:39:11,746 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 77 transitions. Word has length 33 [2018-10-27 15:39:11,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:11,746 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 77 transitions. [2018-10-27 15:39:11,746 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 15:39:11,746 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 77 transitions. [2018-10-27 15:39:11,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-27 15:39:11,748 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:11,748 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 6, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:11,748 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:11,748 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:11,749 INFO L82 PathProgramCache]: Analyzing trace with hash -1707835635, now seen corresponding path program 3 times [2018-10-27 15:39:11,749 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:11,750 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:11,750 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:39:11,750 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:11,750 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:11,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:11,957 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:11,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:11,957 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:11,958 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:11,958 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:11,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:11,958 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:11,967 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:39:11,967 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:39:11,987 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:39:11,987 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:39:11,990 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:12,032 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:12,032 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:12,338 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:12,359 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:12,359 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-27 15:39:12,359 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:12,360 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 15:39:12,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 15:39:12,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=409, Unknown=0, NotChecked=0, Total=650 [2018-10-27 15:39:12,362 INFO L87 Difference]: Start difference. First operand 70 states and 77 transitions. Second operand 14 states. [2018-10-27 15:39:12,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:12,509 INFO L93 Difference]: Finished difference Result 122 states and 133 transitions. [2018-10-27 15:39:12,509 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 15:39:12,509 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 45 [2018-10-27 15:39:12,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:12,512 INFO L225 Difference]: With dead ends: 122 [2018-10-27 15:39:12,512 INFO L226 Difference]: Without dead ends: 116 [2018-10-27 15:39:12,513 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=247, Invalid=455, Unknown=0, NotChecked=0, Total=702 [2018-10-27 15:39:12,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2018-10-27 15:39:12,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 77. [2018-10-27 15:39:12,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-27 15:39:12,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 85 transitions. [2018-10-27 15:39:12,522 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 85 transitions. Word has length 45 [2018-10-27 15:39:12,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:12,523 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 85 transitions. [2018-10-27 15:39:12,523 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 15:39:12,523 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 85 transitions. [2018-10-27 15:39:12,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-10-27 15:39:12,525 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:12,525 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:12,525 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:12,525 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:12,526 INFO L82 PathProgramCache]: Analyzing trace with hash 1071743214, now seen corresponding path program 4 times [2018-10-27 15:39:12,526 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:12,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:12,527 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:39:12,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:12,527 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:12,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:12,814 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:12,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:12,815 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:12,815 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:12,815 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:12,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:12,816 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:12,827 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:12,827 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:39:12,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:12,852 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:12,935 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:12,935 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:13,374 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:13,394 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:13,395 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-27 15:39:13,395 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:13,396 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 15:39:13,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 15:39:13,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=470, Unknown=0, NotChecked=0, Total=756 [2018-10-27 15:39:13,397 INFO L87 Difference]: Start difference. First operand 77 states and 85 transitions. Second operand 15 states. [2018-10-27 15:39:13,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:13,560 INFO L93 Difference]: Finished difference Result 129 states and 141 transitions. [2018-10-27 15:39:13,560 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-27 15:39:13,560 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 48 [2018-10-27 15:39:13,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:13,563 INFO L225 Difference]: With dead ends: 129 [2018-10-27 15:39:13,563 INFO L226 Difference]: Without dead ends: 123 [2018-10-27 15:39:13,565 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=292, Invalid=520, Unknown=0, NotChecked=0, Total=812 [2018-10-27 15:39:13,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-27 15:39:13,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 84. [2018-10-27 15:39:13,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-27 15:39:13,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 93 transitions. [2018-10-27 15:39:13,572 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 93 transitions. Word has length 48 [2018-10-27 15:39:13,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:13,573 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 93 transitions. [2018-10-27 15:39:13,573 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 15:39:13,573 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 93 transitions. [2018-10-27 15:39:13,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-27 15:39:13,575 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:13,575 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 8, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:13,575 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:13,575 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:13,575 INFO L82 PathProgramCache]: Analyzing trace with hash 535766893, now seen corresponding path program 5 times [2018-10-27 15:39:13,576 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:13,576 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:13,577 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:13,577 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:13,577 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:13,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:13,857 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:13,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:13,858 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:13,858 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:13,858 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:13,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:13,858 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:13,866 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:39:13,866 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:39:13,894 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-27 15:39:13,894 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:39:13,897 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:14,015 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-27 15:39:14,015 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:14,152 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-27 15:39:14,173 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:14,174 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 8, 8] total 26 [2018-10-27 15:39:14,174 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:14,174 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 15:39:14,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 15:39:14,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=409, Unknown=0, NotChecked=0, Total=650 [2018-10-27 15:39:14,175 INFO L87 Difference]: Start difference. First operand 84 states and 93 transitions. Second operand 20 states. [2018-10-27 15:39:14,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:14,491 INFO L93 Difference]: Finished difference Result 181 states and 202 transitions. [2018-10-27 15:39:14,491 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 15:39:14,491 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 51 [2018-10-27 15:39:14,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:14,494 INFO L225 Difference]: With dead ends: 181 [2018-10-27 15:39:14,494 INFO L226 Difference]: Without dead ends: 167 [2018-10-27 15:39:14,496 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=247, Invalid=455, Unknown=0, NotChecked=0, Total=702 [2018-10-27 15:39:14,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2018-10-27 15:39:14,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 115. [2018-10-27 15:39:14,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-27 15:39:14,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 128 transitions. [2018-10-27 15:39:14,505 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 128 transitions. Word has length 51 [2018-10-27 15:39:14,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:14,506 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 128 transitions. [2018-10-27 15:39:14,506 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 15:39:14,506 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 128 transitions. [2018-10-27 15:39:14,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-10-27 15:39:14,509 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:14,509 INFO L375 BasicCegarLoop]: trace histogram [13, 13, 12, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:14,509 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:14,510 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:14,510 INFO L82 PathProgramCache]: Analyzing trace with hash 227276404, now seen corresponding path program 6 times [2018-10-27 15:39:14,510 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:14,511 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:14,511 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:39:14,511 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:14,511 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:14,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:14,842 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:14,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:14,842 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:14,842 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:14,842 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:14,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:14,843 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:14,851 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:39:14,851 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:39:14,908 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:39:14,908 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:39:14,912 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:15,149 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:15,150 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:15,754 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 264 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:15,775 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:15,776 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-27 15:39:15,776 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:15,776 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 15:39:15,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 15:39:15,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=640, Invalid=920, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 15:39:15,778 INFO L87 Difference]: Start difference. First operand 115 states and 128 transitions. Second operand 21 states. [2018-10-27 15:39:15,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:15,967 INFO L93 Difference]: Finished difference Result 186 states and 204 transitions. [2018-10-27 15:39:15,968 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-27 15:39:15,968 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 66 [2018-10-27 15:39:15,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:15,970 INFO L225 Difference]: With dead ends: 186 [2018-10-27 15:39:15,970 INFO L226 Difference]: Without dead ends: 180 [2018-10-27 15:39:15,972 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 113 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=646, Invalid=994, Unknown=0, NotChecked=0, Total=1640 [2018-10-27 15:39:15,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-10-27 15:39:15,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 122. [2018-10-27 15:39:15,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-10-27 15:39:15,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 136 transitions. [2018-10-27 15:39:15,980 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 136 transitions. Word has length 66 [2018-10-27 15:39:15,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:15,980 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 136 transitions. [2018-10-27 15:39:15,980 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 15:39:15,980 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 136 transitions. [2018-10-27 15:39:15,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-27 15:39:15,982 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:15,982 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 13, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:15,982 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:15,983 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:15,983 INFO L82 PathProgramCache]: Analyzing trace with hash 1732418355, now seen corresponding path program 7 times [2018-10-27 15:39:15,983 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:15,984 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:15,984 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:39:15,984 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:15,984 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:15,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:16,327 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 0 proven. 303 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:16,327 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:16,327 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:16,328 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:16,328 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:16,328 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:16,328 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:16,337 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:16,337 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:39:16,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:16,364 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:16,425 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 0 proven. 303 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:16,426 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:17,345 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 0 proven. 303 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:17,366 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:17,366 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-27 15:39:17,367 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:17,367 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 15:39:17,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 15:39:17,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=713, Invalid=1009, Unknown=0, NotChecked=0, Total=1722 [2018-10-27 15:39:17,368 INFO L87 Difference]: Start difference. First operand 122 states and 136 transitions. Second operand 22 states. [2018-10-27 15:39:17,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:17,571 INFO L93 Difference]: Finished difference Result 193 states and 212 transitions. [2018-10-27 15:39:17,571 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 15:39:17,572 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 69 [2018-10-27 15:39:17,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:17,574 INFO L225 Difference]: With dead ends: 193 [2018-10-27 15:39:17,574 INFO L226 Difference]: Without dead ends: 187 [2018-10-27 15:39:17,576 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 118 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=719, Invalid=1087, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 15:39:17,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-27 15:39:17,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 129. [2018-10-27 15:39:17,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-10-27 15:39:17,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 144 transitions. [2018-10-27 15:39:17,583 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 144 transitions. Word has length 69 [2018-10-27 15:39:17,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:17,583 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 144 transitions. [2018-10-27 15:39:17,583 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 15:39:17,583 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 144 transitions. [2018-10-27 15:39:17,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-10-27 15:39:17,585 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:17,585 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 14, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:17,585 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:17,586 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:17,586 INFO L82 PathProgramCache]: Analyzing trace with hash 1957710356, now seen corresponding path program 8 times [2018-10-27 15:39:17,586 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:17,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:17,587 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:17,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:17,587 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:17,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:18,003 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:18,003 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:18,004 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:18,004 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:18,004 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:18,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:18,004 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:18,012 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:39:18,012 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:39:18,048 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-27 15:39:18,048 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:39:18,052 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:18,808 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-27 15:39:18,808 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:18,950 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-27 15:39:18,971 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:18,971 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 9, 9] total 35 [2018-10-27 15:39:18,971 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:18,972 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-27 15:39:18,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-27 15:39:18,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=475, Invalid=715, Unknown=0, NotChecked=0, Total=1190 [2018-10-27 15:39:18,973 INFO L87 Difference]: Start difference. First operand 129 states and 144 transitions. Second operand 28 states. [2018-10-27 15:39:19,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:19,366 INFO L93 Difference]: Finished difference Result 263 states and 293 transitions. [2018-10-27 15:39:19,367 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 15:39:19,367 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 72 [2018-10-27 15:39:19,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:19,369 INFO L225 Difference]: With dead ends: 263 [2018-10-27 15:39:19,370 INFO L226 Difference]: Without dead ends: 247 [2018-10-27 15:39:19,371 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 132 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=481, Invalid=779, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 15:39:19,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-10-27 15:39:19,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 167. [2018-10-27 15:39:19,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-27 15:39:19,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 187 transitions. [2018-10-27 15:39:19,379 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 187 transitions. Word has length 72 [2018-10-27 15:39:19,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:19,379 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 187 transitions. [2018-10-27 15:39:19,379 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-27 15:39:19,379 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 187 transitions. [2018-10-27 15:39:19,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-10-27 15:39:19,381 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:19,382 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 19, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:19,382 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:19,382 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:19,382 INFO L82 PathProgramCache]: Analyzing trace with hash -1693515634, now seen corresponding path program 9 times [2018-10-27 15:39:19,382 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:19,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:19,383 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:39:19,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:19,383 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:19,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:20,032 INFO L134 CoverageAnalysis]: Checked inductivity of 615 backedges. 0 proven. 615 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:20,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:20,033 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:20,033 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:20,033 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:20,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:20,033 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:20,043 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:39:20,043 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:39:20,073 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:39:20,073 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:39:20,076 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:20,175 INFO L134 CoverageAnalysis]: Checked inductivity of 615 backedges. 0 proven. 615 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:20,175 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:21,965 INFO L134 CoverageAnalysis]: Checked inductivity of 615 backedges. 0 proven. 615 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:21,994 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:21,994 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-10-27 15:39:21,994 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:21,995 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-27 15:39:21,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-27 15:39:21,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1336, Invalid=1744, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 15:39:21,996 INFO L87 Difference]: Start difference. First operand 167 states and 187 transitions. Second operand 29 states. [2018-10-27 15:39:22,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:22,332 INFO L93 Difference]: Finished difference Result 260 states and 286 transitions. [2018-10-27 15:39:22,333 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-27 15:39:22,333 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 90 [2018-10-27 15:39:22,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:22,336 INFO L225 Difference]: With dead ends: 260 [2018-10-27 15:39:22,336 INFO L226 Difference]: Without dead ends: 254 [2018-10-27 15:39:22,338 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 153 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1342, Invalid=1850, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 15:39:22,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2018-10-27 15:39:22,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 174. [2018-10-27 15:39:22,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-10-27 15:39:22,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 195 transitions. [2018-10-27 15:39:22,343 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 195 transitions. Word has length 90 [2018-10-27 15:39:22,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:22,344 INFO L481 AbstractCegarLoop]: Abstraction has 174 states and 195 transitions. [2018-10-27 15:39:22,344 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-27 15:39:22,344 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 195 transitions. [2018-10-27 15:39:22,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-10-27 15:39:22,346 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:22,346 INFO L375 BasicCegarLoop]: trace histogram [21, 21, 20, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:22,346 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:22,347 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:22,347 INFO L82 PathProgramCache]: Analyzing trace with hash 1143150669, now seen corresponding path program 10 times [2018-10-27 15:39:22,347 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:22,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:22,348 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:39:22,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:22,348 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:22,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:22,783 INFO L134 CoverageAnalysis]: Checked inductivity of 675 backedges. 0 proven. 675 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:22,783 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:22,783 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:22,783 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:22,783 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:22,784 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:22,784 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:22,792 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:22,792 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:39:22,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:22,834 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:22,906 INFO L134 CoverageAnalysis]: Checked inductivity of 675 backedges. 0 proven. 675 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:22,906 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:23,769 INFO L134 CoverageAnalysis]: Checked inductivity of 675 backedges. 0 proven. 675 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:23,790 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:23,790 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 58 [2018-10-27 15:39:23,790 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:23,790 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-27 15:39:23,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-27 15:39:23,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1441, Invalid=1865, Unknown=0, NotChecked=0, Total=3306 [2018-10-27 15:39:23,792 INFO L87 Difference]: Start difference. First operand 174 states and 195 transitions. Second operand 30 states. [2018-10-27 15:39:24,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:24,050 INFO L93 Difference]: Finished difference Result 267 states and 294 transitions. [2018-10-27 15:39:24,051 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-27 15:39:24,051 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 93 [2018-10-27 15:39:24,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:24,053 INFO L225 Difference]: With dead ends: 267 [2018-10-27 15:39:24,053 INFO L226 Difference]: Without dead ends: 261 [2018-10-27 15:39:24,056 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 158 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1447, Invalid=1975, Unknown=0, NotChecked=0, Total=3422 [2018-10-27 15:39:24,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2018-10-27 15:39:24,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 181. [2018-10-27 15:39:24,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2018-10-27 15:39:24,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 203 transitions. [2018-10-27 15:39:24,061 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 203 transitions. Word has length 93 [2018-10-27 15:39:24,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:24,062 INFO L481 AbstractCegarLoop]: Abstraction has 181 states and 203 transitions. [2018-10-27 15:39:24,062 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-27 15:39:24,062 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 203 transitions. [2018-10-27 15:39:24,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-27 15:39:24,064 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:24,064 INFO L375 BasicCegarLoop]: trace histogram [22, 22, 21, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:24,064 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:24,064 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:24,065 INFO L82 PathProgramCache]: Analyzing trace with hash 492467246, now seen corresponding path program 11 times [2018-10-27 15:39:24,065 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:24,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:24,066 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:24,066 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:24,066 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:24,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:24,518 INFO L134 CoverageAnalysis]: Checked inductivity of 738 backedges. 0 proven. 738 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:24,518 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:24,518 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:24,518 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:24,519 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:24,519 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:24,519 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:24,526 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:39:24,526 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:39:24,547 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 15:39:24,548 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:39:24,551 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:24,765 INFO L134 CoverageAnalysis]: Checked inductivity of 738 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 693 trivial. 0 not checked. [2018-10-27 15:39:24,765 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:25,045 INFO L134 CoverageAnalysis]: Checked inductivity of 738 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 693 trivial. 0 not checked. [2018-10-27 15:39:25,065 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:25,065 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 10, 10] total 45 [2018-10-27 15:39:25,065 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:25,066 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-27 15:39:25,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-27 15:39:25,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=830, Invalid=1150, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 15:39:25,067 INFO L87 Difference]: Start difference. First operand 181 states and 203 transitions. Second operand 37 states. [2018-10-27 15:39:25,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:25,544 INFO L93 Difference]: Finished difference Result 358 states and 398 transitions. [2018-10-27 15:39:25,552 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-27 15:39:25,552 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 96 [2018-10-27 15:39:25,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:25,554 INFO L225 Difference]: With dead ends: 358 [2018-10-27 15:39:25,554 INFO L226 Difference]: Without dead ends: 340 [2018-10-27 15:39:25,555 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 178 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=836, Invalid=1234, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 15:39:25,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2018-10-27 15:39:25,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 226. [2018-10-27 15:39:25,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2018-10-27 15:39:25,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 254 transitions. [2018-10-27 15:39:25,564 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 254 transitions. Word has length 96 [2018-10-27 15:39:25,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:25,565 INFO L481 AbstractCegarLoop]: Abstraction has 226 states and 254 transitions. [2018-10-27 15:39:25,565 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-27 15:39:25,565 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 254 transitions. [2018-10-27 15:39:25,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-10-27 15:39:25,567 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:25,567 INFO L375 BasicCegarLoop]: trace histogram [28, 28, 27, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:25,567 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:25,567 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:25,568 INFO L82 PathProgramCache]: Analyzing trace with hash 494608371, now seen corresponding path program 12 times [2018-10-27 15:39:25,569 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:25,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:25,570 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:39:25,570 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:25,570 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:25,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:26,205 INFO L134 CoverageAnalysis]: Checked inductivity of 1197 backedges. 0 proven. 1197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:26,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:26,206 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:26,206 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:26,206 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:26,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:26,206 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:26,213 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:39:26,214 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:39:26,259 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:39:26,259 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:39:26,263 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:26,360 INFO L134 CoverageAnalysis]: Checked inductivity of 1197 backedges. 0 proven. 1197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:26,361 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:28,261 INFO L134 CoverageAnalysis]: Checked inductivity of 1197 backedges. 0 proven. 1197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:28,282 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:28,282 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 74 [2018-10-27 15:39:28,282 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:28,283 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-27 15:39:28,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-27 15:39:28,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2018-10-27 15:39:28,285 INFO L87 Difference]: Start difference. First operand 226 states and 254 transitions. Second operand 38 states. [2018-10-27 15:39:28,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:28,751 INFO L93 Difference]: Finished difference Result 344 states and 379 transitions. [2018-10-27 15:39:28,751 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-27 15:39:28,751 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 117 [2018-10-27 15:39:28,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:28,755 INFO L225 Difference]: With dead ends: 344 [2018-10-27 15:39:28,755 INFO L226 Difference]: Without dead ends: 338 [2018-10-27 15:39:28,757 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 198 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 267 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2431, Invalid=3119, Unknown=0, NotChecked=0, Total=5550 [2018-10-27 15:39:28,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2018-10-27 15:39:28,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 233. [2018-10-27 15:39:28,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2018-10-27 15:39:28,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 262 transitions. [2018-10-27 15:39:28,763 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 262 transitions. Word has length 117 [2018-10-27 15:39:28,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:28,763 INFO L481 AbstractCegarLoop]: Abstraction has 233 states and 262 transitions. [2018-10-27 15:39:28,764 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-27 15:39:28,764 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 262 transitions. [2018-10-27 15:39:28,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2018-10-27 15:39:28,765 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:28,765 INFO L375 BasicCegarLoop]: trace histogram [29, 29, 28, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:28,766 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:28,766 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:28,766 INFO L82 PathProgramCache]: Analyzing trace with hash -612030252, now seen corresponding path program 13 times [2018-10-27 15:39:28,766 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:28,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:28,767 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:39:28,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:28,767 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:28,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:29,835 INFO L134 CoverageAnalysis]: Checked inductivity of 1281 backedges. 0 proven. 1281 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:29,835 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:29,835 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:29,836 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:29,836 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:29,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:29,836 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:29,843 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:29,844 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:39:29,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:29,884 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:29,958 INFO L134 CoverageAnalysis]: Checked inductivity of 1281 backedges. 0 proven. 1281 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:29,958 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:31,444 INFO L134 CoverageAnalysis]: Checked inductivity of 1281 backedges. 0 proven. 1281 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:31,465 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:31,466 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 76 [2018-10-27 15:39:31,466 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:31,466 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 15:39:31,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 15:39:31,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2566, Invalid=3134, Unknown=0, NotChecked=0, Total=5700 [2018-10-27 15:39:31,469 INFO L87 Difference]: Start difference. First operand 233 states and 262 transitions. Second operand 39 states. [2018-10-27 15:39:32,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:32,025 INFO L93 Difference]: Finished difference Result 351 states and 387 transitions. [2018-10-27 15:39:32,025 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-27 15:39:32,025 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 120 [2018-10-27 15:39:32,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:32,039 INFO L225 Difference]: With dead ends: 351 [2018-10-27 15:39:32,039 INFO L226 Difference]: Without dead ends: 345 [2018-10-27 15:39:32,042 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 203 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2572, Invalid=3280, Unknown=0, NotChecked=0, Total=5852 [2018-10-27 15:39:32,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 345 states. [2018-10-27 15:39:32,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 345 to 240. [2018-10-27 15:39:32,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2018-10-27 15:39:32,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 270 transitions. [2018-10-27 15:39:32,048 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 270 transitions. Word has length 120 [2018-10-27 15:39:32,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:32,048 INFO L481 AbstractCegarLoop]: Abstraction has 240 states and 270 transitions. [2018-10-27 15:39:32,048 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 15:39:32,048 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 270 transitions. [2018-10-27 15:39:32,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-10-27 15:39:32,050 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:32,050 INFO L375 BasicCegarLoop]: trace histogram [30, 30, 29, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:32,050 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:32,050 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:32,050 INFO L82 PathProgramCache]: Analyzing trace with hash -314283949, now seen corresponding path program 14 times [2018-10-27 15:39:32,051 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:32,051 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:32,051 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:32,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:32,052 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:32,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:32,668 INFO L134 CoverageAnalysis]: Checked inductivity of 1368 backedges. 0 proven. 1368 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:32,669 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:32,669 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:32,669 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:32,669 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:32,669 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:32,669 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:32,676 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:39:32,677 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:39:32,699 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-27 15:39:32,699 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:39:32,702 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:32,935 INFO L134 CoverageAnalysis]: Checked inductivity of 1368 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 1305 trivial. 0 not checked. [2018-10-27 15:39:32,935 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:33,226 INFO L134 CoverageAnalysis]: Checked inductivity of 1368 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 1305 trivial. 0 not checked. [2018-10-27 15:39:33,246 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:33,246 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 11, 11] total 56 [2018-10-27 15:39:33,246 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:33,247 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-27 15:39:33,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-27 15:39:33,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1336, Invalid=1744, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 15:39:33,249 INFO L87 Difference]: Start difference. First operand 240 states and 270 transitions. Second operand 47 states. [2018-10-27 15:39:34,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:34,258 INFO L93 Difference]: Finished difference Result 466 states and 517 transitions. [2018-10-27 15:39:34,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-27 15:39:34,259 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 123 [2018-10-27 15:39:34,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:34,261 INFO L225 Difference]: With dead ends: 466 [2018-10-27 15:39:34,261 INFO L226 Difference]: Without dead ends: 446 [2018-10-27 15:39:34,264 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 230 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1342, Invalid=1850, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 15:39:34,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2018-10-27 15:39:34,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 292. [2018-10-27 15:39:34,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2018-10-27 15:39:34,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 329 transitions. [2018-10-27 15:39:34,273 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 329 transitions. Word has length 123 [2018-10-27 15:39:34,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:34,273 INFO L481 AbstractCegarLoop]: Abstraction has 292 states and 329 transitions. [2018-10-27 15:39:34,273 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-27 15:39:34,274 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 329 transitions. [2018-10-27 15:39:34,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-10-27 15:39:34,275 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:34,275 INFO L375 BasicCegarLoop]: trace histogram [37, 37, 36, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:34,276 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:34,276 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:34,276 INFO L82 PathProgramCache]: Analyzing trace with hash -755226131, now seen corresponding path program 15 times [2018-10-27 15:39:34,276 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:34,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:34,277 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:39:34,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:34,277 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:34,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:35,884 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 0 proven. 2082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:35,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:35,885 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:35,885 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:35,885 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:35,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:35,885 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:35,894 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:39:35,894 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:39:35,945 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:39:35,945 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:39:35,950 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:36,026 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 0 proven. 2082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:36,027 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:38,869 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 0 proven. 2082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:38,890 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:38,891 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 94 [2018-10-27 15:39:38,891 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:38,891 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-27 15:39:38,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-27 15:39:38,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4015, Invalid=4727, Unknown=0, NotChecked=0, Total=8742 [2018-10-27 15:39:38,893 INFO L87 Difference]: Start difference. First operand 292 states and 329 transitions. Second operand 48 states. [2018-10-27 15:39:39,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:39,493 INFO L93 Difference]: Finished difference Result 438 states and 483 transitions. [2018-10-27 15:39:39,494 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-27 15:39:39,494 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 147 [2018-10-27 15:39:39,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:39,497 INFO L225 Difference]: With dead ends: 438 [2018-10-27 15:39:39,497 INFO L226 Difference]: Without dead ends: 432 [2018-10-27 15:39:39,499 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 248 SyntacticMatches, 1 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=4021, Invalid=4909, Unknown=0, NotChecked=0, Total=8930 [2018-10-27 15:39:39,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states. [2018-10-27 15:39:39,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 299. [2018-10-27 15:39:39,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 299 states. [2018-10-27 15:39:39,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 337 transitions. [2018-10-27 15:39:39,506 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 337 transitions. Word has length 147 [2018-10-27 15:39:39,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:39,506 INFO L481 AbstractCegarLoop]: Abstraction has 299 states and 337 transitions. [2018-10-27 15:39:39,507 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-27 15:39:39,507 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 337 transitions. [2018-10-27 15:39:39,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-10-27 15:39:39,508 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:39,509 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 37, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:39,509 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:39,509 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:39,509 INFO L82 PathProgramCache]: Analyzing trace with hash -1973406962, now seen corresponding path program 16 times [2018-10-27 15:39:39,509 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:39,510 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:39,510 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:39:39,510 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:39,510 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:39,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:40,534 INFO L134 CoverageAnalysis]: Checked inductivity of 2193 backedges. 0 proven. 2193 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:40,534 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:40,534 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:40,534 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:40,534 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:40,534 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:40,534 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:40,542 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:40,542 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:39:40,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:40,592 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:40,668 INFO L134 CoverageAnalysis]: Checked inductivity of 2193 backedges. 0 proven. 2193 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:40,668 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:43,351 INFO L134 CoverageAnalysis]: Checked inductivity of 2193 backedges. 0 proven. 2193 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:43,374 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:43,375 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 96 [2018-10-27 15:39:43,375 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:43,375 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-27 15:39:43,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-27 15:39:43,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4196, Invalid=4924, Unknown=0, NotChecked=0, Total=9120 [2018-10-27 15:39:43,377 INFO L87 Difference]: Start difference. First operand 299 states and 337 transitions. Second operand 49 states. [2018-10-27 15:39:44,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:44,280 INFO L93 Difference]: Finished difference Result 445 states and 491 transitions. [2018-10-27 15:39:44,280 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-27 15:39:44,280 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 150 [2018-10-27 15:39:44,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:44,284 INFO L225 Difference]: With dead ends: 445 [2018-10-27 15:39:44,284 INFO L226 Difference]: Without dead ends: 439 [2018-10-27 15:39:44,285 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 253 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4202, Invalid=5110, Unknown=0, NotChecked=0, Total=9312 [2018-10-27 15:39:44,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 439 states. [2018-10-27 15:39:44,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 439 to 306. [2018-10-27 15:39:44,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 306 states. [2018-10-27 15:39:44,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 345 transitions. [2018-10-27 15:39:44,293 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 345 transitions. Word has length 150 [2018-10-27 15:39:44,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:44,293 INFO L481 AbstractCegarLoop]: Abstraction has 306 states and 345 transitions. [2018-10-27 15:39:44,293 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-27 15:39:44,294 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 345 transitions. [2018-10-27 15:39:44,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-10-27 15:39:44,295 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:44,296 INFO L375 BasicCegarLoop]: trace histogram [39, 39, 38, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:44,296 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:44,296 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:44,296 INFO L82 PathProgramCache]: Analyzing trace with hash -324892083, now seen corresponding path program 17 times [2018-10-27 15:39:44,296 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:44,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:44,297 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:44,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:44,297 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:44,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:45,299 INFO L134 CoverageAnalysis]: Checked inductivity of 2307 backedges. 0 proven. 2307 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:45,299 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:45,299 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:45,299 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:45,299 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:45,299 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:45,299 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:45,308 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:39:45,308 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:39:45,336 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-27 15:39:45,336 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:39:45,339 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:45,779 INFO L134 CoverageAnalysis]: Checked inductivity of 2307 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 2223 trivial. 0 not checked. [2018-10-27 15:39:45,779 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:47,584 INFO L134 CoverageAnalysis]: Checked inductivity of 2307 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 2223 trivial. 0 not checked. [2018-10-27 15:39:47,605 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:47,605 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 12, 12] total 68 [2018-10-27 15:39:47,605 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:47,605 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-10-27 15:39:47,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-10-27 15:39:47,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2026, Invalid=2530, Unknown=0, NotChecked=0, Total=4556 [2018-10-27 15:39:47,607 INFO L87 Difference]: Start difference. First operand 306 states and 345 transitions. Second operand 58 states. [2018-10-27 15:39:48,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:48,646 INFO L93 Difference]: Finished difference Result 587 states and 650 transitions. [2018-10-27 15:39:48,646 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-27 15:39:48,646 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 153 [2018-10-27 15:39:48,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:48,650 INFO L225 Difference]: With dead ends: 587 [2018-10-27 15:39:48,651 INFO L226 Difference]: Without dead ends: 565 [2018-10-27 15:39:48,652 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 288 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 273 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2032, Invalid=2660, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 15:39:48,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2018-10-27 15:39:48,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 365. [2018-10-27 15:39:48,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 365 states. [2018-10-27 15:39:48,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365 states to 365 states and 412 transitions. [2018-10-27 15:39:48,659 INFO L78 Accepts]: Start accepts. Automaton has 365 states and 412 transitions. Word has length 153 [2018-10-27 15:39:48,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:48,660 INFO L481 AbstractCegarLoop]: Abstraction has 365 states and 412 transitions. [2018-10-27 15:39:48,660 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-10-27 15:39:48,660 INFO L276 IsEmpty]: Start isEmpty. Operand 365 states and 412 transitions. [2018-10-27 15:39:48,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2018-10-27 15:39:48,662 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:48,662 INFO L375 BasicCegarLoop]: trace histogram [47, 47, 46, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:48,663 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:48,663 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:48,663 INFO L82 PathProgramCache]: Analyzing trace with hash 752334548, now seen corresponding path program 18 times [2018-10-27 15:39:48,663 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:48,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:48,664 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:39:48,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:48,664 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:48,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:50,151 INFO L134 CoverageAnalysis]: Checked inductivity of 3351 backedges. 0 proven. 3351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:50,151 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:50,151 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:50,151 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:50,151 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:50,152 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:50,152 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:50,159 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:39:50,159 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:39:50,227 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:39:50,227 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:39:50,231 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:50,352 INFO L134 CoverageAnalysis]: Checked inductivity of 3351 backedges. 0 proven. 3351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:50,353 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:54,172 INFO L134 CoverageAnalysis]: Checked inductivity of 3351 backedges. 0 proven. 3351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:54,193 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:54,193 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 116 [2018-10-27 15:39:54,193 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:54,194 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-10-27 15:39:54,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-10-27 15:39:54,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6226, Invalid=7114, Unknown=0, NotChecked=0, Total=13340 [2018-10-27 15:39:54,196 INFO L87 Difference]: Start difference. First operand 365 states and 412 transitions. Second operand 59 states. [2018-10-27 15:39:55,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:55,379 INFO L93 Difference]: Finished difference Result 542 states and 598 transitions. [2018-10-27 15:39:55,382 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-27 15:39:55,382 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 180 [2018-10-27 15:39:55,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:55,386 INFO L225 Difference]: With dead ends: 542 [2018-10-27 15:39:55,386 INFO L226 Difference]: Without dead ends: 536 [2018-10-27 15:39:55,387 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 303 SyntacticMatches, 1 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=6232, Invalid=7340, Unknown=0, NotChecked=0, Total=13572 [2018-10-27 15:39:55,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 536 states. [2018-10-27 15:39:55,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 536 to 372. [2018-10-27 15:39:55,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 372 states. [2018-10-27 15:39:55,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 420 transitions. [2018-10-27 15:39:55,394 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 420 transitions. Word has length 180 [2018-10-27 15:39:55,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:55,395 INFO L481 AbstractCegarLoop]: Abstraction has 372 states and 420 transitions. [2018-10-27 15:39:55,395 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-10-27 15:39:55,395 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 420 transitions. [2018-10-27 15:39:55,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2018-10-27 15:39:55,397 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:55,397 INFO L375 BasicCegarLoop]: trace histogram [48, 48, 47, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:55,397 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:55,397 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:55,397 INFO L82 PathProgramCache]: Analyzing trace with hash -252635693, now seen corresponding path program 19 times [2018-10-27 15:39:55,398 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:55,398 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:55,398 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:39:55,398 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:55,399 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:55,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:56,780 INFO L134 CoverageAnalysis]: Checked inductivity of 3492 backedges. 0 proven. 3492 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:56,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:56,781 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:56,781 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:56,781 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:56,781 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:56,781 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:56,790 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:56,790 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:39:56,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:56,852 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:56,958 INFO L134 CoverageAnalysis]: Checked inductivity of 3492 backedges. 0 proven. 3492 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:56,958 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:40:00,809 INFO L134 CoverageAnalysis]: Checked inductivity of 3492 backedges. 0 proven. 3492 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:40:00,830 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:40:00,831 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 118 [2018-10-27 15:40:00,831 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:40:00,831 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-27 15:40:00,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-27 15:40:00,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6451, Invalid=7355, Unknown=0, NotChecked=0, Total=13806 [2018-10-27 15:40:00,833 INFO L87 Difference]: Start difference. First operand 372 states and 420 transitions. Second operand 60 states. [2018-10-27 15:40:02,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:40:02,274 INFO L93 Difference]: Finished difference Result 549 states and 606 transitions. [2018-10-27 15:40:02,274 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-10-27 15:40:02,275 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 183 [2018-10-27 15:40:02,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:40:02,278 INFO L225 Difference]: With dead ends: 549 [2018-10-27 15:40:02,278 INFO L226 Difference]: Without dead ends: 543 [2018-10-27 15:40:02,279 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 308 SyntacticMatches, 1 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=6457, Invalid=7585, Unknown=0, NotChecked=0, Total=14042 [2018-10-27 15:40:02,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 543 states. [2018-10-27 15:40:02,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 543 to 379. [2018-10-27 15:40:02,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 379 states. [2018-10-27 15:40:02,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 428 transitions. [2018-10-27 15:40:02,287 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 428 transitions. Word has length 183 [2018-10-27 15:40:02,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:40:02,288 INFO L481 AbstractCegarLoop]: Abstraction has 379 states and 428 transitions. [2018-10-27 15:40:02,288 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-27 15:40:02,288 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 428 transitions. [2018-10-27 15:40:02,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-10-27 15:40:02,290 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:40:02,291 INFO L375 BasicCegarLoop]: trace histogram [49, 49, 48, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:40:02,291 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:40:02,291 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:40:02,291 INFO L82 PathProgramCache]: Analyzing trace with hash 895935092, now seen corresponding path program 20 times [2018-10-27 15:40:02,292 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:40:02,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:40:02,293 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:40:02,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:40:02,293 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:40:02,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:40:03,875 INFO L134 CoverageAnalysis]: Checked inductivity of 3636 backedges. 0 proven. 3636 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:40:03,875 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:40:03,876 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:40:03,876 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:40:03,876 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:40:03,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:40:03,876 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:40:03,884 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:40:03,885 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:40:03,917 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 15:40:03,917 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:40:03,920 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:40:04,422 INFO L134 CoverageAnalysis]: Checked inductivity of 3636 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 3528 trivial. 0 not checked. [2018-10-27 15:40:04,422 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:40:04,956 INFO L134 CoverageAnalysis]: Checked inductivity of 3636 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 3528 trivial. 0 not checked. [2018-10-27 15:40:04,976 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:40:04,976 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 13, 13] total 81 [2018-10-27 15:40:04,976 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:40:04,977 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-10-27 15:40:04,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-10-27 15:40:04,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2936, Invalid=3544, Unknown=0, NotChecked=0, Total=6480 [2018-10-27 15:40:04,978 INFO L87 Difference]: Start difference. First operand 379 states and 428 transitions. Second operand 70 states. [2018-10-27 15:40:08,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:40:08,196 INFO L93 Difference]: Finished difference Result 721 states and 797 transitions. [2018-10-27 15:40:08,196 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-10-27 15:40:08,196 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 186 [2018-10-27 15:40:08,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:40:08,200 INFO L225 Difference]: With dead ends: 721 [2018-10-27 15:40:08,200 INFO L226 Difference]: Without dead ends: 697 [2018-10-27 15:40:08,201 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 352 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 334 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2942, Invalid=3700, Unknown=0, NotChecked=0, Total=6642 [2018-10-27 15:40:08,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 697 states. [2018-10-27 15:40:08,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 697 to 445. [2018-10-27 15:40:08,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 445 states. [2018-10-27 15:40:08,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 503 transitions. [2018-10-27 15:40:08,210 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 503 transitions. Word has length 186 [2018-10-27 15:40:08,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:40:08,211 INFO L481 AbstractCegarLoop]: Abstraction has 445 states and 503 transitions. [2018-10-27 15:40:08,211 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-10-27 15:40:08,211 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 503 transitions. [2018-10-27 15:40:08,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2018-10-27 15:40:08,213 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:40:08,213 INFO L375 BasicCegarLoop]: trace histogram [58, 58, 57, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:40:08,213 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:40:08,213 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:40:08,213 INFO L82 PathProgramCache]: Analyzing trace with hash 1102113070, now seen corresponding path program 21 times [2018-10-27 15:40:08,214 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:40:08,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:40:08,214 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:40:08,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:40:08,215 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:40:08,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:40:10,070 INFO L134 CoverageAnalysis]: Checked inductivity of 5094 backedges. 0 proven. 5094 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:40:10,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:40:10,071 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:40:10,071 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:40:10,071 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:40:10,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:40:10,071 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:40:10,079 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:40:10,079 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:40:10,153 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:40:10,154 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:40:10,158 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:40:10,464 INFO L134 CoverageAnalysis]: Checked inductivity of 5094 backedges. 0 proven. 5094 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:40:10,465 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:40:15,885 INFO L134 CoverageAnalysis]: Checked inductivity of 5094 backedges. 0 proven. 5094 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:40:15,906 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:40:15,906 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 140 [2018-10-27 15:40:15,906 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:40:15,907 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-10-27 15:40:15,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-10-27 15:40:15,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9190, Invalid=10270, Unknown=0, NotChecked=0, Total=19460 [2018-10-27 15:40:15,908 INFO L87 Difference]: Start difference. First operand 445 states and 503 transitions. Second operand 71 states. [2018-10-27 15:40:18,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:40:18,260 INFO L93 Difference]: Finished difference Result 656 states and 724 transitions. [2018-10-27 15:40:18,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-10-27 15:40:18,261 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 216 [2018-10-27 15:40:18,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:40:18,265 INFO L225 Difference]: With dead ends: 656 [2018-10-27 15:40:18,265 INFO L226 Difference]: Without dead ends: 650 [2018-10-27 15:40:18,266 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 363 SyntacticMatches, 1 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=9196, Invalid=10544, Unknown=0, NotChecked=0, Total=19740 [2018-10-27 15:40:18,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 650 states. [2018-10-27 15:40:18,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 650 to 452. [2018-10-27 15:40:18,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 452 states. [2018-10-27 15:40:18,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 511 transitions. [2018-10-27 15:40:18,275 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 511 transitions. Word has length 216 [2018-10-27 15:40:18,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:40:18,275 INFO L481 AbstractCegarLoop]: Abstraction has 452 states and 511 transitions. [2018-10-27 15:40:18,275 INFO L482 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-10-27 15:40:18,275 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 511 transitions. [2018-10-27 15:40:18,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2018-10-27 15:40:18,277 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:40:18,277 INFO L375 BasicCegarLoop]: trace histogram [59, 59, 58, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:40:18,277 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:40:18,278 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:40:18,278 INFO L82 PathProgramCache]: Analyzing trace with hash -518064979, now seen corresponding path program 22 times [2018-10-27 15:40:18,278 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:40:18,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:40:18,279 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:40:18,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:40:18,279 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:40:18,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:40:20,186 INFO L134 CoverageAnalysis]: Checked inductivity of 5268 backedges. 0 proven. 5268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:40:20,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:40:20,186 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:40:20,186 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:40:20,186 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:40:20,187 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:40:20,187 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:40:20,201 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:40:20,201 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:40:20,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:40:20,274 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:40:20,409 INFO L134 CoverageAnalysis]: Checked inductivity of 5268 backedges. 0 proven. 5268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:40:20,409 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:40:25,774 INFO L134 CoverageAnalysis]: Checked inductivity of 5268 backedges. 0 proven. 5268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:40:25,805 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:40:25,805 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 142 [2018-10-27 15:40:25,805 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:40:25,806 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-10-27 15:40:25,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-10-27 15:40:25,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9463, Invalid=10559, Unknown=0, NotChecked=0, Total=20022 [2018-10-27 15:40:25,808 INFO L87 Difference]: Start difference. First operand 452 states and 511 transitions. Second operand 72 states. [2018-10-27 15:40:28,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:40:28,193 INFO L93 Difference]: Finished difference Result 663 states and 732 transitions. [2018-10-27 15:40:28,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-10-27 15:40:28,194 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 219 [2018-10-27 15:40:28,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:40:28,196 INFO L225 Difference]: With dead ends: 663 [2018-10-27 15:40:28,196 INFO L226 Difference]: Without dead ends: 657 [2018-10-27 15:40:28,197 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 510 GetRequests, 368 SyntacticMatches, 1 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=9469, Invalid=10837, Unknown=0, NotChecked=0, Total=20306 [2018-10-27 15:40:28,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 657 states. [2018-10-27 15:40:28,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 657 to 459. [2018-10-27 15:40:28,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 459 states. [2018-10-27 15:40:28,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 519 transitions. [2018-10-27 15:40:28,207 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 519 transitions. Word has length 219 [2018-10-27 15:40:28,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:40:28,207 INFO L481 AbstractCegarLoop]: Abstraction has 459 states and 519 transitions. [2018-10-27 15:40:28,207 INFO L482 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-10-27 15:40:28,207 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 519 transitions. [2018-10-27 15:40:28,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-10-27 15:40:28,209 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:40:28,209 INFO L375 BasicCegarLoop]: trace histogram [60, 60, 59, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:40:28,209 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:40:28,210 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:40:28,210 INFO L82 PathProgramCache]: Analyzing trace with hash -399850290, now seen corresponding path program 23 times [2018-10-27 15:40:28,210 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:40:28,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:40:28,211 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:40:28,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:40:28,211 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:40:28,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:40:30,303 INFO L134 CoverageAnalysis]: Checked inductivity of 5445 backedges. 0 proven. 5445 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:40:30,303 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:40:30,303 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:40:30,303 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:40:30,303 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:40:30,303 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:40:30,303 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:40:30,314 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:40:30,314 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:40:30,441 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-27 15:40:30,441 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:40:30,444 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:40:31,013 INFO L134 CoverageAnalysis]: Checked inductivity of 5445 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 5310 trivial. 0 not checked. [2018-10-27 15:40:31,013 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:40:31,714 INFO L134 CoverageAnalysis]: Checked inductivity of 5445 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 5310 trivial. 0 not checked. [2018-10-27 15:40:31,735 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:40:31,735 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 14, 14] total 95 [2018-10-27 15:40:31,736 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:40:31,736 INFO L460 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-10-27 15:40:31,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-10-27 15:40:31,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4105, Invalid=4825, Unknown=0, NotChecked=0, Total=8930 [2018-10-27 15:40:31,738 INFO L87 Difference]: Start difference. First operand 459 states and 519 transitions. Second operand 83 states. [2018-10-27 15:40:34,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:40:34,489 INFO L93 Difference]: Finished difference Result 868 states and 958 transitions. [2018-10-27 15:40:34,489 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-10-27 15:40:34,489 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 222 [2018-10-27 15:40:34,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:40:34,493 INFO L225 Difference]: With dead ends: 868 [2018-10-27 15:40:34,494 INFO L226 Difference]: Without dead ends: 842 [2018-10-27 15:40:34,495 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 422 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=4111, Invalid=5009, Unknown=0, NotChecked=0, Total=9120 [2018-10-27 15:40:34,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 842 states. [2018-10-27 15:40:34,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 842 to 532. [2018-10-27 15:40:34,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 532 states. [2018-10-27 15:40:34,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 602 transitions. [2018-10-27 15:40:34,505 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 602 transitions. Word has length 222 [2018-10-27 15:40:34,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:40:34,505 INFO L481 AbstractCegarLoop]: Abstraction has 532 states and 602 transitions. [2018-10-27 15:40:34,506 INFO L482 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-10-27 15:40:34,506 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 602 transitions. [2018-10-27 15:40:34,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2018-10-27 15:40:34,508 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:40:34,508 INFO L375 BasicCegarLoop]: trace histogram [70, 70, 69, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:40:34,508 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:40:34,508 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:40:34,508 INFO L82 PathProgramCache]: Analyzing trace with hash -1768862701, now seen corresponding path program 24 times [2018-10-27 15:40:34,508 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:40:34,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:40:34,509 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:40:34,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:40:34,509 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:40:34,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:40:37,057 INFO L134 CoverageAnalysis]: Checked inductivity of 7410 backedges. 0 proven. 7410 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:40:37,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:40:37,057 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:40:37,057 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:40:37,057 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:40:37,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:40:37,057 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:40:37,065 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:40:37,065 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:40:37,140 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:40:37,141 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:40:37,145 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:40:37,365 INFO L134 CoverageAnalysis]: Checked inductivity of 7410 backedges. 0 proven. 7410 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:40:37,365 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:40:45,023 INFO L134 CoverageAnalysis]: Checked inductivity of 7410 backedges. 0 proven. 7410 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:40:45,044 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:40:45,044 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84, 84] total 166 [2018-10-27 15:40:45,044 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:40:45,045 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2018-10-27 15:40:45,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2018-10-27 15:40:45,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13051, Invalid=14339, Unknown=0, NotChecked=0, Total=27390 [2018-10-27 15:40:45,047 INFO L87 Difference]: Start difference. First operand 532 states and 602 transitions. Second operand 84 states. [2018-10-27 15:40:47,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:40:47,943 INFO L93 Difference]: Finished difference Result 780 states and 861 transitions. [2018-10-27 15:40:47,943 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2018-10-27 15:40:47,943 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 255 [2018-10-27 15:40:47,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:40:47,947 INFO L225 Difference]: With dead ends: 780 [2018-10-27 15:40:47,947 INFO L226 Difference]: Without dead ends: 774 [2018-10-27 15:40:47,948 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 594 GetRequests, 428 SyntacticMatches, 1 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 635 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=13057, Invalid=14665, Unknown=0, NotChecked=0, Total=27722 [2018-10-27 15:40:47,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 774 states. [2018-10-27 15:40:47,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 774 to 539. [2018-10-27 15:40:47,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 539 states. [2018-10-27 15:40:47,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 610 transitions. [2018-10-27 15:40:47,957 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 610 transitions. Word has length 255 [2018-10-27 15:40:47,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:40:47,958 INFO L481 AbstractCegarLoop]: Abstraction has 539 states and 610 transitions. [2018-10-27 15:40:47,958 INFO L482 AbstractCegarLoop]: Interpolant automaton has 84 states. [2018-10-27 15:40:47,958 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 610 transitions. [2018-10-27 15:40:47,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-10-27 15:40:47,960 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:40:47,960 INFO L375 BasicCegarLoop]: trace histogram [71, 71, 70, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:40:47,960 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:40:47,961 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:40:47,961 INFO L82 PathProgramCache]: Analyzing trace with hash 412573620, now seen corresponding path program 25 times [2018-10-27 15:40:47,961 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:40:47,962 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:40:47,962 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:40:47,962 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:40:47,962 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:40:47,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:40:50,968 INFO L134 CoverageAnalysis]: Checked inductivity of 7620 backedges. 0 proven. 7620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:40:50,968 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:40:50,968 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:40:50,968 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:40:50,968 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:40:50,969 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:40:50,969 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:40:50,978 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:40:50,978 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:40:51,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:40:51,061 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:40:51,239 INFO L134 CoverageAnalysis]: Checked inductivity of 7620 backedges. 0 proven. 7620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:40:51,239 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:40:58,680 INFO L134 CoverageAnalysis]: Checked inductivity of 7620 backedges. 0 proven. 7620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:40:58,715 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:40:58,716 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 168 [2018-10-27 15:40:58,716 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:40:58,716 INFO L460 AbstractCegarLoop]: Interpolant automaton has 85 states [2018-10-27 15:40:58,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2018-10-27 15:40:58,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13376, Invalid=14680, Unknown=0, NotChecked=0, Total=28056 [2018-10-27 15:40:58,719 INFO L87 Difference]: Start difference. First operand 539 states and 610 transitions. Second operand 85 states. [2018-10-27 15:41:02,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:02,394 INFO L93 Difference]: Finished difference Result 787 states and 869 transitions. [2018-10-27 15:41:02,394 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-10-27 15:41:02,394 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 258 [2018-10-27 15:41:02,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:02,399 INFO L225 Difference]: With dead ends: 787 [2018-10-27 15:41:02,399 INFO L226 Difference]: Without dead ends: 781 [2018-10-27 15:41:02,400 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 433 SyntacticMatches, 1 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 643 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=13382, Invalid=15010, Unknown=0, NotChecked=0, Total=28392 [2018-10-27 15:41:02,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 781 states. [2018-10-27 15:41:02,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 781 to 546. [2018-10-27 15:41:02,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 546 states. [2018-10-27 15:41:02,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 546 states to 546 states and 618 transitions. [2018-10-27 15:41:02,409 INFO L78 Accepts]: Start accepts. Automaton has 546 states and 618 transitions. Word has length 258 [2018-10-27 15:41:02,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:02,409 INFO L481 AbstractCegarLoop]: Abstraction has 546 states and 618 transitions. [2018-10-27 15:41:02,409 INFO L482 AbstractCegarLoop]: Interpolant automaton has 85 states. [2018-10-27 15:41:02,409 INFO L276 IsEmpty]: Start isEmpty. Operand 546 states and 618 transitions. [2018-10-27 15:41:02,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2018-10-27 15:41:02,411 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:02,412 INFO L375 BasicCegarLoop]: trace histogram [72, 72, 71, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:02,412 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:02,412 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:02,412 INFO L82 PathProgramCache]: Analyzing trace with hash 431856755, now seen corresponding path program 26 times [2018-10-27 15:41:02,412 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:02,413 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:02,413 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:02,413 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:02,413 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:02,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:05,581 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 7833 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:05,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:05,582 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:05,582 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:05,582 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:05,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:05,582 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:05,592 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:41:05,592 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:41:05,748 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-27 15:41:05,748 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:05,754 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:06,601 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 7668 trivial. 0 not checked. [2018-10-27 15:41:06,602 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:07,523 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 7668 trivial. 0 not checked. [2018-10-27 15:41:07,544 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:07,545 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 15, 15] total 110 [2018-10-27 15:41:07,545 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:07,545 INFO L460 AbstractCegarLoop]: Interpolant automaton has 97 states [2018-10-27 15:41:07,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2018-10-27 15:41:07,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5575, Invalid=6415, Unknown=0, NotChecked=0, Total=11990 [2018-10-27 15:41:07,546 INFO L87 Difference]: Start difference. First operand 546 states and 618 transitions. Second operand 97 states. [2018-10-27 15:41:11,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:11,650 INFO L93 Difference]: Finished difference Result 1028 states and 1133 transitions. [2018-10-27 15:41:11,651 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2018-10-27 15:41:11,651 INFO L78 Accepts]: Start accepts. Automaton has 97 states. Word has length 261 [2018-10-27 15:41:11,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:11,656 INFO L225 Difference]: With dead ends: 1028 [2018-10-27 15:41:11,656 INFO L226 Difference]: Without dead ends: 1000 [2018-10-27 15:41:11,657 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 608 GetRequests, 498 SyntacticMatches, 1 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 471 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=5581, Invalid=6629, Unknown=0, NotChecked=0, Total=12210 [2018-10-27 15:41:11,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1000 states. [2018-10-27 15:41:11,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1000 to 626. [2018-10-27 15:41:11,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 626 states. [2018-10-27 15:41:11,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 626 states to 626 states and 709 transitions. [2018-10-27 15:41:11,666 INFO L78 Accepts]: Start accepts. Automaton has 626 states and 709 transitions. Word has length 261 [2018-10-27 15:41:11,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:11,666 INFO L481 AbstractCegarLoop]: Abstraction has 626 states and 709 transitions. [2018-10-27 15:41:11,666 INFO L482 AbstractCegarLoop]: Interpolant automaton has 97 states. [2018-10-27 15:41:11,666 INFO L276 IsEmpty]: Start isEmpty. Operand 626 states and 709 transitions. [2018-10-27 15:41:11,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2018-10-27 15:41:11,669 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:11,669 INFO L375 BasicCegarLoop]: trace histogram [83, 83, 82, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:11,669 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:11,669 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:11,669 INFO L82 PathProgramCache]: Analyzing trace with hash -1637142579, now seen corresponding path program 27 times [2018-10-27 15:41:11,670 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:11,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:11,670 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:11,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:11,670 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:11,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:15,930 INFO L134 CoverageAnalysis]: Checked inductivity of 10407 backedges. 0 proven. 10407 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:15,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:15,930 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:15,931 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:15,931 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:15,931 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:15,931 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:15,938 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:41:15,938 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:41:16,029 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:41:16,029 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:16,035 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:16,165 INFO L134 CoverageAnalysis]: Checked inductivity of 10407 backedges. 0 proven. 10407 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:16,166 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:26,670 INFO L134 CoverageAnalysis]: Checked inductivity of 10407 backedges. 0 proven. 10407 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:26,691 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:26,691 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98, 98] total 194 [2018-10-27 15:41:26,691 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:26,692 INFO L460 AbstractCegarLoop]: Interpolant automaton has 98 states [2018-10-27 15:41:26,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2018-10-27 15:41:26,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17965, Invalid=19477, Unknown=0, NotChecked=0, Total=37442 [2018-10-27 15:41:26,694 INFO L87 Difference]: Start difference. First operand 626 states and 709 transitions. Second operand 98 states. [2018-10-27 15:41:32,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:32,335 INFO L93 Difference]: Finished difference Result 914 states and 1009 transitions. [2018-10-27 15:41:32,336 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2018-10-27 15:41:32,336 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 297 [2018-10-27 15:41:32,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:32,341 INFO L225 Difference]: With dead ends: 914 [2018-10-27 15:41:32,341 INFO L226 Difference]: Without dead ends: 908 [2018-10-27 15:41:32,342 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 692 GetRequests, 498 SyntacticMatches, 1 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 747 ImplicationChecksByTransitivity, 14.5s TimeCoverageRelationStatistics Valid=17971, Invalid=19859, Unknown=0, NotChecked=0, Total=37830 [2018-10-27 15:41:32,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 908 states. [2018-10-27 15:41:32,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 908 to 633. [2018-10-27 15:41:32,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 633 states. [2018-10-27 15:41:32,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 633 states to 633 states and 717 transitions. [2018-10-27 15:41:32,351 INFO L78 Accepts]: Start accepts. Automaton has 633 states and 717 transitions. Word has length 297 [2018-10-27 15:41:32,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:32,351 INFO L481 AbstractCegarLoop]: Abstraction has 633 states and 717 transitions. [2018-10-27 15:41:32,352 INFO L482 AbstractCegarLoop]: Interpolant automaton has 98 states. [2018-10-27 15:41:32,352 INFO L276 IsEmpty]: Start isEmpty. Operand 633 states and 717 transitions. [2018-10-27 15:41:32,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2018-10-27 15:41:32,354 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:32,354 INFO L375 BasicCegarLoop]: trace histogram [84, 84, 83, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:32,354 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:32,354 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:32,355 INFO L82 PathProgramCache]: Analyzing trace with hash 1112549934, now seen corresponding path program 28 times [2018-10-27 15:41:32,355 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:32,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:32,355 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:32,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:32,356 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:32,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:36,820 INFO L134 CoverageAnalysis]: Checked inductivity of 10656 backedges. 0 proven. 10656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:36,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:36,821 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:36,821 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:36,821 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:36,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:36,821 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:36,829 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:36,829 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:41:36,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:36,922 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:37,092 INFO L134 CoverageAnalysis]: Checked inductivity of 10656 backedges. 0 proven. 10656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:37,092 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:47,417 INFO L134 CoverageAnalysis]: Checked inductivity of 10656 backedges. 0 proven. 10656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:47,437 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:47,438 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 196 [2018-10-27 15:41:47,438 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:47,438 INFO L460 AbstractCegarLoop]: Interpolant automaton has 99 states [2018-10-27 15:41:47,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2018-10-27 15:41:47,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18346, Invalid=19874, Unknown=0, NotChecked=0, Total=38220 [2018-10-27 15:41:47,441 INFO L87 Difference]: Start difference. First operand 633 states and 717 transitions. Second operand 99 states. [2018-10-27 15:41:53,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:53,046 INFO L93 Difference]: Finished difference Result 921 states and 1017 transitions. [2018-10-27 15:41:53,046 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-10-27 15:41:53,046 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 300 [2018-10-27 15:41:53,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:53,051 INFO L225 Difference]: With dead ends: 921 [2018-10-27 15:41:53,051 INFO L226 Difference]: Without dead ends: 915 [2018-10-27 15:41:53,053 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 699 GetRequests, 503 SyntacticMatches, 1 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 755 ImplicationChecksByTransitivity, 14.6s TimeCoverageRelationStatistics Valid=18352, Invalid=20260, Unknown=0, NotChecked=0, Total=38612 [2018-10-27 15:41:53,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 915 states. [2018-10-27 15:41:53,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 915 to 640. [2018-10-27 15:41:53,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 640 states. [2018-10-27 15:41:53,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 640 states to 640 states and 725 transitions. [2018-10-27 15:41:53,062 INFO L78 Accepts]: Start accepts. Automaton has 640 states and 725 transitions. Word has length 300 [2018-10-27 15:41:53,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:53,063 INFO L481 AbstractCegarLoop]: Abstraction has 640 states and 725 transitions. [2018-10-27 15:41:53,063 INFO L482 AbstractCegarLoop]: Interpolant automaton has 99 states. [2018-10-27 15:41:53,063 INFO L276 IsEmpty]: Start isEmpty. Operand 640 states and 725 transitions. [2018-10-27 15:41:53,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 304 [2018-10-27 15:41:53,065 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:53,065 INFO L375 BasicCegarLoop]: trace histogram [85, 85, 84, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:53,066 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:53,066 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:53,066 INFO L82 PathProgramCache]: Analyzing trace with hash -709031891, now seen corresponding path program 29 times [2018-10-27 15:41:53,066 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:53,067 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:53,067 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:53,067 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:53,067 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:53,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:57,349 INFO L134 CoverageAnalysis]: Checked inductivity of 10908 backedges. 0 proven. 10908 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:57,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:57,349 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:57,349 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:57,349 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:57,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:57,349 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:57,357 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:41:57,357 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:41:57,409 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 15:41:57,409 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:57,414 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:59,465 INFO L134 CoverageAnalysis]: Checked inductivity of 10908 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 10710 trivial. 0 not checked. [2018-10-27 15:41:59,466 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:00,869 INFO L134 CoverageAnalysis]: Checked inductivity of 10908 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 10710 trivial. 0 not checked. [2018-10-27 15:42:00,890 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:00,890 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 16, 16] total 126 [2018-10-27 15:42:00,890 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:00,891 INFO L460 AbstractCegarLoop]: Interpolant automaton has 112 states [2018-10-27 15:42:00,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2018-10-27 15:42:00,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7391, Invalid=8359, Unknown=0, NotChecked=0, Total=15750 [2018-10-27 15:42:00,892 INFO L87 Difference]: Start difference. First operand 640 states and 725 transitions. Second operand 112 states. [2018-10-27 15:42:06,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:06,239 INFO L93 Difference]: Finished difference Result 1201 states and 1322 transitions. [2018-10-27 15:42:06,239 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2018-10-27 15:42:06,239 INFO L78 Accepts]: Start accepts. Automaton has 112 states. Word has length 303 [2018-10-27 15:42:06,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:06,245 INFO L225 Difference]: With dead ends: 1201 [2018-10-27 15:42:06,245 INFO L226 Difference]: Without dead ends: 1171 [2018-10-27 15:42:06,246 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 706 GetRequests, 580 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=7397, Invalid=8605, Unknown=0, NotChecked=0, Total=16002 [2018-10-27 15:42:06,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1171 states. [2018-10-27 15:42:06,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1171 to 727. [2018-10-27 15:42:06,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 727 states. [2018-10-27 15:42:06,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 727 states to 727 states and 824 transitions. [2018-10-27 15:42:06,257 INFO L78 Accepts]: Start accepts. Automaton has 727 states and 824 transitions. Word has length 303 [2018-10-27 15:42:06,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:06,258 INFO L481 AbstractCegarLoop]: Abstraction has 727 states and 824 transitions. [2018-10-27 15:42:06,258 INFO L482 AbstractCegarLoop]: Interpolant automaton has 112 states. [2018-10-27 15:42:06,258 INFO L276 IsEmpty]: Start isEmpty. Operand 727 states and 824 transitions. [2018-10-27 15:42:06,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 343 [2018-10-27 15:42:06,260 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:06,261 INFO L375 BasicCegarLoop]: trace histogram [97, 97, 96, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:06,261 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:06,261 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:06,261 INFO L82 PathProgramCache]: Analyzing trace with hash -1992803276, now seen corresponding path program 30 times [2018-10-27 15:42:06,261 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:06,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:06,262 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:06,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:06,262 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:06,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:11,020 INFO L134 CoverageAnalysis]: Checked inductivity of 14202 backedges. 0 proven. 14202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:11,020 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:11,020 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:11,020 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:11,021 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:11,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:11,021 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:42:11,028 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:42:11,028 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:42:11,141 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:42:11,141 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:11,148 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:11,429 INFO L134 CoverageAnalysis]: Checked inductivity of 14202 backedges. 0 proven. 14202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:11,429 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:23,642 INFO L134 CoverageAnalysis]: Checked inductivity of 14202 backedges. 0 proven. 14202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:23,662 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:23,663 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [113, 113, 113] total 206 [2018-10-27 15:42:23,663 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:23,663 INFO L460 AbstractCegarLoop]: Interpolant automaton has 113 states [2018-10-27 15:42:23,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2018-10-27 15:42:23,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20311, Invalid=21919, Unknown=0, NotChecked=0, Total=42230 [2018-10-27 15:42:23,666 INFO L87 Difference]: Start difference. First operand 727 states and 824 transitions. Second operand 113 states. [2018-10-27 15:42:31,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:31,978 INFO L93 Difference]: Finished difference Result 893 states and 1003 transitions. [2018-10-27 15:42:31,978 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2018-10-27 15:42:31,978 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 342 [2018-10-27 15:42:31,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:31,983 INFO L225 Difference]: With dead ends: 893 [2018-10-27 15:42:31,983 INFO L226 Difference]: Without dead ends: 887 [2018-10-27 15:42:31,984 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 797 GetRequests, 573 SyntacticMatches, 19 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2604 ImplicationChecksByTransitivity, 16.8s TimeCoverageRelationStatistics Valid=20317, Invalid=22325, Unknown=0, NotChecked=0, Total=42642 [2018-10-27 15:42:31,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 887 states. [2018-10-27 15:42:31,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 887 to 734. [2018-10-27 15:42:31,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 734 states. [2018-10-27 15:42:31,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 734 states to 734 states and 832 transitions. [2018-10-27 15:42:31,993 INFO L78 Accepts]: Start accepts. Automaton has 734 states and 832 transitions. Word has length 342 [2018-10-27 15:42:31,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:31,994 INFO L481 AbstractCegarLoop]: Abstraction has 734 states and 832 transitions. [2018-10-27 15:42:31,994 INFO L482 AbstractCegarLoop]: Interpolant automaton has 113 states. [2018-10-27 15:42:31,994 INFO L276 IsEmpty]: Start isEmpty. Operand 734 states and 832 transitions. [2018-10-27 15:42:31,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2018-10-27 15:42:31,997 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:31,997 INFO L375 BasicCegarLoop]: trace histogram [98, 98, 97, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:31,997 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:31,997 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:31,998 INFO L82 PathProgramCache]: Analyzing trace with hash -294769805, now seen corresponding path program 31 times [2018-10-27 15:42:31,998 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:31,998 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:31,999 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:31,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:31,999 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:32,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:36,843 INFO L134 CoverageAnalysis]: Checked inductivity of 14493 backedges. 0 proven. 14493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:36,843 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:36,844 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:36,844 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:36,844 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:36,844 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:36,844 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:42:36,851 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:36,851 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:42:36,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:36,977 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:37,506 INFO L134 CoverageAnalysis]: Checked inductivity of 14493 backedges. 0 proven. 14493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:37,506 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:49,513 INFO L134 CoverageAnalysis]: Checked inductivity of 14493 backedges. 0 proven. 14493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:49,535 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:49,535 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [114, 114, 114] total 206 [2018-10-27 15:42:49,535 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:49,536 INFO L460 AbstractCegarLoop]: Interpolant automaton has 114 states [2018-10-27 15:42:49,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2018-10-27 15:42:49,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20311, Invalid=21919, Unknown=0, NotChecked=0, Total=42230 [2018-10-27 15:42:49,538 INFO L87 Difference]: Start difference. First operand 734 states and 832 transitions. Second operand 114 states. [2018-10-27 15:42:56,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:56,529 INFO L93 Difference]: Finished difference Result 867 states and 978 transitions. [2018-10-27 15:42:56,529 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2018-10-27 15:42:56,529 INFO L78 Accepts]: Start accepts. Automaton has 114 states. Word has length 345 [2018-10-27 15:42:56,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:56,533 INFO L225 Difference]: With dead ends: 867 [2018-10-27 15:42:56,534 INFO L226 Difference]: Without dead ends: 861 [2018-10-27 15:42:56,535 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 804 GetRequests, 578 SyntacticMatches, 21 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2805 ImplicationChecksByTransitivity, 16.9s TimeCoverageRelationStatistics Valid=20317, Invalid=22325, Unknown=0, NotChecked=0, Total=42642 [2018-10-27 15:42:56,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 861 states. [2018-10-27 15:42:56,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 861 to 741. [2018-10-27 15:42:56,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 741 states. [2018-10-27 15:42:56,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 741 states to 741 states and 840 transitions. [2018-10-27 15:42:56,543 INFO L78 Accepts]: Start accepts. Automaton has 741 states and 840 transitions. Word has length 345 [2018-10-27 15:42:56,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:56,544 INFO L481 AbstractCegarLoop]: Abstraction has 741 states and 840 transitions. [2018-10-27 15:42:56,544 INFO L482 AbstractCegarLoop]: Interpolant automaton has 114 states. [2018-10-27 15:42:56,544 INFO L276 IsEmpty]: Start isEmpty. Operand 741 states and 840 transitions. [2018-10-27 15:42:56,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 349 [2018-10-27 15:42:56,548 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:56,548 INFO L375 BasicCegarLoop]: trace histogram [99, 99, 98, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:56,548 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:56,549 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:56,549 INFO L82 PathProgramCache]: Analyzing trace with hash -304447532, now seen corresponding path program 32 times [2018-10-27 15:42:56,549 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:56,549 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:56,550 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:56,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:56,550 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:56,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:01,206 INFO L134 CoverageAnalysis]: Checked inductivity of 14787 backedges. 0 proven. 14787 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:01,207 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:01,207 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:01,207 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:01,207 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:01,207 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:01,207 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:43:01,216 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:43:01,216 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:43:01,271 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-10-27 15:43:01,272 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:43:01,276 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:01,970 INFO L134 CoverageAnalysis]: Checked inductivity of 14787 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 14553 trivial. 0 not checked. [2018-10-27 15:43:01,970 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:03,456 INFO L134 CoverageAnalysis]: Checked inductivity of 14787 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 14553 trivial. 0 not checked. [2018-10-27 15:43:03,478 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:03,478 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [115, 17, 17] total 131 [2018-10-27 15:43:03,478 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:03,479 INFO L460 AbstractCegarLoop]: Interpolant automaton has 116 states [2018-10-27 15:43:03,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2018-10-27 15:43:03,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8011, Invalid=9019, Unknown=0, NotChecked=0, Total=17030 [2018-10-27 15:43:03,480 INFO L87 Difference]: Start difference. First operand 741 states and 840 transitions. Second operand 116 states. [2018-10-27 15:43:10,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:10,990 INFO L93 Difference]: Finished difference Result 847 states and 961 transitions. [2018-10-27 15:43:10,991 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2018-10-27 15:43:10,991 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 348 [2018-10-27 15:43:10,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:10,995 INFO L225 Difference]: With dead ends: 847 [2018-10-27 15:43:10,995 INFO L226 Difference]: Without dead ends: 839 [2018-10-27 15:43:10,996 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 811 GetRequests, 679 SyntacticMatches, 2 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=8017, Invalid=9275, Unknown=0, NotChecked=0, Total=17292 [2018-10-27 15:43:10,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 839 states. [2018-10-27 15:43:11,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 839 to 751. [2018-10-27 15:43:11,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 751 states. [2018-10-27 15:43:11,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 751 states to 751 states and 851 transitions. [2018-10-27 15:43:11,005 INFO L78 Accepts]: Start accepts. Automaton has 751 states and 851 transitions. Word has length 348 [2018-10-27 15:43:11,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:11,006 INFO L481 AbstractCegarLoop]: Abstraction has 751 states and 851 transitions. [2018-10-27 15:43:11,006 INFO L482 AbstractCegarLoop]: Interpolant automaton has 116 states. [2018-10-27 15:43:11,006 INFO L276 IsEmpty]: Start isEmpty. Operand 751 states and 851 transitions. [2018-10-27 15:43:11,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 355 [2018-10-27 15:43:11,008 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:11,009 INFO L375 BasicCegarLoop]: trace histogram [100, 100, 99, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:11,009 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:11,009 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:11,009 INFO L82 PathProgramCache]: Analyzing trace with hash -127276786, now seen corresponding path program 33 times [2018-10-27 15:43:11,009 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:11,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:11,010 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:43:11,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:11,010 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:11,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Received shutdown request... [2018-10-27 15:43:11,922 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-27 15:43:11,926 WARN L205 ceAbstractionStarter]: Timeout [2018-10-27 15:43:11,926 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 03:43:11 BoogieIcfgContainer [2018-10-27 15:43:11,926 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-27 15:43:11,927 INFO L168 Benchmark]: Toolchain (without parser) took 245081.38 ms. Allocated memory was 1.5 GB in the beginning and 2.4 GB in the end (delta: 850.4 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -789.9 MB). Peak memory consumption was 60.5 MB. Max. memory is 7.1 GB. [2018-10-27 15:43:11,928 INFO L168 Benchmark]: CDTParser took 0.19 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. [2018-10-27 15:43:11,929 INFO L168 Benchmark]: CACSL2BoogieTranslator took 284.54 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. [2018-10-27 15:43:11,929 INFO L168 Benchmark]: Boogie Procedure Inliner took 22.04 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. [2018-10-27 15:43:11,930 INFO L168 Benchmark]: Boogie Preprocessor took 23.57 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. [2018-10-27 15:43:11,930 INFO L168 Benchmark]: RCFGBuilder took 447.59 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 738.2 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -778.1 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. [2018-10-27 15:43:11,931 INFO L168 Benchmark]: TraceAbstraction took 244299.19 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 112.2 MB). Free memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: -22.3 MB). Peak memory consumption was 89.8 MB. Max. memory is 7.1 GB. [2018-10-27 15:43:11,934 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 284.54 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 22.04 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 23.57 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 447.59 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 738.2 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -778.1 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 244299.19 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 112.2 MB). Free memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: -22.3 MB). Peak memory consumption was 89.8 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 analyzing trace of length 355 with TraceHistMax 100,while InterpolatingTraceCheckCraig was constructing Craig interpolants,while PredicateComparison was comparing new predicate (quantifier-free) to 43 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. TIMEOUT Result, 244.2s OverallTime, 37 OverallIterations, 100 TraceHistogramMax, 71.7s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 519 SDtfs, 13419 SDslu, 15498 SDs, 0 SdLazy, 10671 SolverSat, 4333 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 21.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 12672 GetRequests, 9564 SyntacticMatches, 72 SemanticMatches, 3036 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15512 ImplicationChecksByTransitivity, 162.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=751occurred in iteration=36, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.5s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 36 MinimizatonAttempts, 4989 StatesRemovedByMinimization, 34 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.4s SsaConstructionTime, 2.2s SatisfiabilityAnalysisTime, 165.6s InterpolantComputationTime, 10931 NumberOfCodeBlocks, 9743 NumberOfCodeBlocksAsserted, 156 NumberOfCheckSat, 16268 ConstructedInterpolants, 0 QuantifiedInterpolants, 9423888 SizeOfPredicates, 78 NumberOfNonLiveVariables, 10115 ConjunctsInSsa, 1373 ConjunctsInUnsatCore, 102 InterpolantComputations, 3 PerfectInterpolantSequences, 92865/414984 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown