java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/diamond_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 04:59:14,392 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 04:59:14,394 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 04:59:14,407 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 04:59:14,407 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 04:59:14,408 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 04:59:14,409 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 04:59:14,411 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 04:59:14,413 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 04:59:14,414 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 04:59:14,415 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 04:59:14,415 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 04:59:14,416 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 04:59:14,421 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 04:59:14,422 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 04:59:14,423 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 04:59:14,424 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 04:59:14,429 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 04:59:14,434 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 04:59:14,435 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 04:59:14,436 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 04:59:14,440 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 04:59:14,443 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 04:59:14,443 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 04:59:14,444 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 04:59:14,445 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 04:59:14,447 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 04:59:14,447 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 04:59:14,448 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 04:59:14,450 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 04:59:14,451 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 04:59:14,451 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-07 04:59:14,451 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-07 04:59:14,452 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-07 04:59:14,453 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-07 04:59:14,453 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-07 04:59:14,454 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-11-07 04:59:14,471 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 04:59:14,471 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 04:59:14,472 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 04:59:14,472 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 04:59:14,473 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 04:59:14,473 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 04:59:14,473 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 04:59:14,473 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 04:59:14,473 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 04:59:14,474 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 04:59:14,474 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 04:59:14,474 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-07 04:59:14,475 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 04:59:14,475 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 04:59:14,475 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 04:59:14,475 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 04:59:14,475 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 04:59:14,476 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 04:59:14,476 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 04:59:14,476 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 04:59:14,476 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 04:59:14,477 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 04:59:14,477 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 04:59:14,477 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 04:59:14,477 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 04:59:14,477 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 04:59:14,478 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 04:59:14,478 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 04:59:14,478 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 04:59:14,478 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 04:59:14,478 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 04:59:14,479 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 04:59:14,479 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 04:59:14,479 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 04:59:14,522 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 04:59:14,539 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 04:59:14,543 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 04:59:14,545 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 04:59:14,545 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 04:59:14,546 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/diamond_false-unreach-call1.i [2018-11-07 04:59:14,616 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c440fbafa/3d8485f3456744588fd7d04a827131e4/FLAG50b9bc482 [2018-11-07 04:59:15,082 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 04:59:15,083 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/diamond_false-unreach-call1.i [2018-11-07 04:59:15,091 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c440fbafa/3d8485f3456744588fd7d04a827131e4/FLAG50b9bc482 [2018-11-07 04:59:15,112 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c440fbafa/3d8485f3456744588fd7d04a827131e4 [2018-11-07 04:59:15,125 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 04:59:15,127 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 04:59:15,128 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 04:59:15,128 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 04:59:15,135 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 04:59:15,136 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:59:15" (1/1) ... [2018-11-07 04:59:15,139 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@65f79378 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:15, skipping insertion in model container [2018-11-07 04:59:15,140 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:59:15" (1/1) ... [2018-11-07 04:59:15,152 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 04:59:15,179 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 04:59:15,375 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 04:59:15,378 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 04:59:15,396 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 04:59:15,412 INFO L193 MainTranslator]: Completed translation [2018-11-07 04:59:15,412 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:15 WrapperNode [2018-11-07 04:59:15,412 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 04:59:15,413 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 04:59:15,414 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 04:59:15,414 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 04:59:15,424 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:15" (1/1) ... [2018-11-07 04:59:15,430 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:15" (1/1) ... [2018-11-07 04:59:15,436 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 04:59:15,437 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 04:59:15,437 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 04:59:15,437 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 04:59:15,448 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:15" (1/1) ... [2018-11-07 04:59:15,448 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:15" (1/1) ... [2018-11-07 04:59:15,449 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:15" (1/1) ... [2018-11-07 04:59:15,449 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:15" (1/1) ... [2018-11-07 04:59:15,452 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:15" (1/1) ... [2018-11-07 04:59:15,457 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:15" (1/1) ... [2018-11-07 04:59:15,458 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:15" (1/1) ... [2018-11-07 04:59:15,460 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 04:59:15,460 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 04:59:15,461 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 04:59:15,461 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 04:59:15,462 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:15" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 04:59:15,584 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 04:59:15,585 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 04:59:15,585 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 04:59:15,585 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 04:59:15,585 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 04:59:15,585 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 04:59:15,585 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 04:59:15,586 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 04:59:15,794 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 04:59:15,795 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:59:15 BoogieIcfgContainer [2018-11-07 04:59:15,795 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 04:59:15,796 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 04:59:15,796 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 04:59:15,799 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 04:59:15,799 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 04:59:15" (1/3) ... [2018-11-07 04:59:15,800 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36d59baa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:59:15, skipping insertion in model container [2018-11-07 04:59:15,801 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:15" (2/3) ... [2018-11-07 04:59:15,801 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36d59baa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:59:15, skipping insertion in model container [2018-11-07 04:59:15,801 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:59:15" (3/3) ... [2018-11-07 04:59:15,803 INFO L112 eAbstractionObserver]: Analyzing ICFG diamond_false-unreach-call1.i [2018-11-07 04:59:15,813 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 04:59:15,822 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 04:59:15,837 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 04:59:15,872 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 04:59:15,872 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 04:59:15,872 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 04:59:15,872 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 04:59:15,873 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 04:59:15,873 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 04:59:15,873 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 04:59:15,873 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 04:59:15,893 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-11-07 04:59:15,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-07 04:59:15,899 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:15,900 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:15,902 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:15,908 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:15,909 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-11-07 04:59:15,911 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:15,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:15,959 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:15,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:15,959 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:15,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:16,013 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:16,015 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 04:59:16,016 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 04:59:16,016 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 04:59:16,019 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 04:59:16,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 04:59:16,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 04:59:16,034 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-11-07 04:59:16,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:16,055 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-11-07 04:59:16,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 04:59:16,057 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-11-07 04:59:16,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:16,066 INFO L225 Difference]: With dead ends: 30 [2018-11-07 04:59:16,066 INFO L226 Difference]: Without dead ends: 13 [2018-11-07 04:59:16,070 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 04:59:16,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-11-07 04:59:16,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-11-07 04:59:16,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-11-07 04:59:16,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-11-07 04:59:16,111 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-11-07 04:59:16,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:16,111 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-11-07 04:59:16,112 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 04:59:16,112 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-11-07 04:59:16,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-07 04:59:16,113 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:16,113 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:16,113 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:16,114 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:16,114 INFO L82 PathProgramCache]: Analyzing trace with hash 1144102878, now seen corresponding path program 1 times [2018-11-07 04:59:16,114 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:16,115 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:16,115 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:16,116 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:16,116 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:16,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:16,405 WARN L179 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2018-11-07 04:59:16,430 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:16,432 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 04:59:16,433 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-07 04:59:16,433 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 04:59:16,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 04:59:16,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 04:59:16,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 04:59:16,436 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-11-07 04:59:16,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:16,539 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2018-11-07 04:59:16,539 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 04:59:16,540 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-11-07 04:59:16,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:16,542 INFO L225 Difference]: With dead ends: 21 [2018-11-07 04:59:16,543 INFO L226 Difference]: Without dead ends: 16 [2018-11-07 04:59:16,544 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 04:59:16,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-11-07 04:59:16,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-11-07 04:59:16,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-11-07 04:59:16,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-11-07 04:59:16,550 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2018-11-07 04:59:16,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:16,551 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-11-07 04:59:16,551 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 04:59:16,551 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-11-07 04:59:16,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-11-07 04:59:16,552 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:16,552 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:16,553 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:16,553 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:16,553 INFO L82 PathProgramCache]: Analyzing trace with hash -2056921797, now seen corresponding path program 1 times [2018-11-07 04:59:16,554 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:16,555 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:16,555 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:16,555 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:16,556 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:16,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:16,715 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:16,715 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:16,715 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:16,716 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-11-07 04:59:16,718 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [26], [29], [31], [37], [38], [39], [41] [2018-11-07 04:59:16,765 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-11-07 04:59:16,765 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 04:59:16,875 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 04:59:17,417 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 04:59:17,419 INFO L272 AbstractInterpreter]: Visited 13 different actions 77 times. Merged at 4 different actions 34 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 4 variables. [2018-11-07 04:59:17,464 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:17,466 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 04:59:17,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:17,466 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:17,488 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:17,488 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 04:59:17,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:17,537 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:17,633 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:17,633 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:17,916 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:17,951 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:17,952 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-11-07 04:59:17,952 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:17,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-07 04:59:17,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-07 04:59:17,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-11-07 04:59:17,954 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 4 states. [2018-11-07 04:59:18,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:18,160 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2018-11-07 04:59:18,165 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-07 04:59:18,165 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-11-07 04:59:18,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:18,166 INFO L225 Difference]: With dead ends: 24 [2018-11-07 04:59:18,166 INFO L226 Difference]: Without dead ends: 19 [2018-11-07 04:59:18,167 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-11-07 04:59:18,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-11-07 04:59:18,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2018-11-07 04:59:18,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-11-07 04:59:18,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2018-11-07 04:59:18,172 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2018-11-07 04:59:18,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:18,172 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2018-11-07 04:59:18,172 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-07 04:59:18,173 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2018-11-07 04:59:18,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-11-07 04:59:18,173 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:18,174 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:18,174 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:18,174 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:18,174 INFO L82 PathProgramCache]: Analyzing trace with hash -281914435, now seen corresponding path program 1 times [2018-11-07 04:59:18,175 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:18,176 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:18,176 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:18,176 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:18,176 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:18,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:18,363 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:18,363 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:18,364 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:18,366 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-11-07 04:59:18,366 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [19], [26], [29], [31], [37], [38], [39], [41] [2018-11-07 04:59:18,368 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-11-07 04:59:18,368 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 04:59:18,376 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 04:59:18,623 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 04:59:18,623 INFO L272 AbstractInterpreter]: Visited 13 different actions 77 times. Merged at 4 different actions 34 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-11-07 04:59:18,663 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:18,663 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 04:59:18,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:18,664 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:18,692 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:18,692 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 04:59:18,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:18,722 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:18,793 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:18,796 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:18,959 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:18,979 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:18,979 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-11-07 04:59:18,979 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:18,980 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-07 04:59:18,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-07 04:59:18,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-11-07 04:59:18,981 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 4 states. [2018-11-07 04:59:19,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:19,109 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2018-11-07 04:59:19,110 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-07 04:59:19,110 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-11-07 04:59:19,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:19,111 INFO L225 Difference]: With dead ends: 26 [2018-11-07 04:59:19,111 INFO L226 Difference]: Without dead ends: 21 [2018-11-07 04:59:19,112 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-11-07 04:59:19,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-11-07 04:59:19,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2018-11-07 04:59:19,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-11-07 04:59:19,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2018-11-07 04:59:19,117 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2018-11-07 04:59:19,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:19,117 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2018-11-07 04:59:19,117 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-07 04:59:19,118 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2018-11-07 04:59:19,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-11-07 04:59:19,118 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:19,119 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:19,119 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:19,119 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:19,119 INFO L82 PathProgramCache]: Analyzing trace with hash 1670825662, now seen corresponding path program 2 times [2018-11-07 04:59:19,120 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:19,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:19,121 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:19,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:19,122 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:19,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:19,456 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:19,456 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:19,456 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:19,456 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:19,457 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:19,457 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:19,457 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:19,468 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 04:59:19,468 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 04:59:19,484 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 04:59:19,485 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:19,488 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:19,516 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:19,517 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:19,581 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:19,607 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:19,607 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-11-07 04:59:19,607 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:19,608 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-07 04:59:19,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-07 04:59:19,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-11-07 04:59:19,609 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2018-11-07 04:59:19,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:19,760 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2018-11-07 04:59:19,761 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 04:59:19,761 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-11-07 04:59:19,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:19,762 INFO L225 Difference]: With dead ends: 29 [2018-11-07 04:59:19,762 INFO L226 Difference]: Without dead ends: 24 [2018-11-07 04:59:19,763 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-11-07 04:59:19,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-11-07 04:59:19,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2018-11-07 04:59:19,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-07 04:59:19,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2018-11-07 04:59:19,767 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 17 [2018-11-07 04:59:19,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:19,768 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2018-11-07 04:59:19,768 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-07 04:59:19,768 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2018-11-07 04:59:19,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-11-07 04:59:19,769 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:19,769 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:19,769 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:19,770 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:19,770 INFO L82 PathProgramCache]: Analyzing trace with hash -849134272, now seen corresponding path program 1 times [2018-11-07 04:59:19,770 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:19,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:19,771 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:19,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:19,772 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:19,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:19,928 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:19,928 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:19,928 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:19,928 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 18 with the following transitions: [2018-11-07 04:59:19,929 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-11-07 04:59:19,930 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-11-07 04:59:19,931 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 04:59:19,935 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 04:59:20,159 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 04:59:20,160 INFO L272 AbstractInterpreter]: Visited 14 different actions 87 times. Merged at 5 different actions 34 times. Widened at 2 different actions 5 times. Found 11 fixpoints after 2 different actions. Largest state had 4 variables. [2018-11-07 04:59:20,198 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:20,198 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 04:59:20,198 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:20,198 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:20,216 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:20,216 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 04:59:20,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:20,246 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:20,382 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:20,382 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:20,407 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:20,426 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-11-07 04:59:20,426 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 6 [2018-11-07 04:59:20,426 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 04:59:20,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 04:59:20,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 04:59:20,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-11-07 04:59:20,428 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand 3 states. [2018-11-07 04:59:20,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:20,441 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2018-11-07 04:59:20,441 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 04:59:20,442 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-11-07 04:59:20,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:20,443 INFO L225 Difference]: With dead ends: 35 [2018-11-07 04:59:20,443 INFO L226 Difference]: Without dead ends: 27 [2018-11-07 04:59:20,444 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-11-07 04:59:20,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-11-07 04:59:20,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-11-07 04:59:20,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-11-07 04:59:20,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2018-11-07 04:59:20,450 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 17 [2018-11-07 04:59:20,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:20,451 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2018-11-07 04:59:20,451 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 04:59:20,451 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2018-11-07 04:59:20,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-11-07 04:59:20,452 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:20,452 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:20,452 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:20,453 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:20,453 INFO L82 PathProgramCache]: Analyzing trace with hash 1277798652, now seen corresponding path program 2 times [2018-11-07 04:59:20,453 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:20,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:20,454 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:20,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:20,454 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:20,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:20,549 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:20,549 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:20,549 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:20,549 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:20,550 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:20,550 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:20,550 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:20,559 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 04:59:20,559 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 04:59:20,610 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 04:59:20,610 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:20,612 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:20,704 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:20,704 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:20,790 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:20,823 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-11-07 04:59:20,823 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 6 [2018-11-07 04:59:20,823 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 04:59:20,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 04:59:20,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 04:59:20,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-11-07 04:59:20,825 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 3 states. [2018-11-07 04:59:20,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:20,869 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2018-11-07 04:59:20,870 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 04:59:20,870 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-11-07 04:59:20,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:20,871 INFO L225 Difference]: With dead ends: 35 [2018-11-07 04:59:20,871 INFO L226 Difference]: Without dead ends: 27 [2018-11-07 04:59:20,871 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-11-07 04:59:20,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-11-07 04:59:20,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-11-07 04:59:20,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-11-07 04:59:20,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2018-11-07 04:59:20,883 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 17 [2018-11-07 04:59:20,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:20,883 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2018-11-07 04:59:20,884 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 04:59:20,884 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2018-11-07 04:59:20,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-11-07 04:59:20,884 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:20,885 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:20,885 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:20,885 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:20,885 INFO L82 PathProgramCache]: Analyzing trace with hash -1242161282, now seen corresponding path program 2 times [2018-11-07 04:59:20,886 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:20,889 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:20,889 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:20,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:20,890 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:20,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:21,103 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:21,103 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:21,103 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:21,103 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:21,104 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:21,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:21,104 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:21,116 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 04:59:21,116 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 04:59:21,127 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 04:59:21,127 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:21,129 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:21,171 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:21,171 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:21,529 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:21,550 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:21,550 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-11-07 04:59:21,550 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:21,550 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-07 04:59:21,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-07 04:59:21,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-11-07 04:59:21,551 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 5 states. [2018-11-07 04:59:21,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:21,741 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2018-11-07 04:59:21,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 04:59:21,742 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-11-07 04:59:21,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:21,743 INFO L225 Difference]: With dead ends: 35 [2018-11-07 04:59:21,743 INFO L226 Difference]: Without dead ends: 30 [2018-11-07 04:59:21,743 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-11-07 04:59:21,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-11-07 04:59:21,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-11-07 04:59:21,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-11-07 04:59:21,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2018-11-07 04:59:21,749 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 17 [2018-11-07 04:59:21,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:21,749 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2018-11-07 04:59:21,749 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-07 04:59:21,750 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2018-11-07 04:59:21,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-11-07 04:59:21,750 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:21,751 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:21,751 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:21,751 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:21,751 INFO L82 PathProgramCache]: Analyzing trace with hash 26004059, now seen corresponding path program 3 times [2018-11-07 04:59:21,751 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:21,752 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:21,753 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:21,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:21,753 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:21,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:21,927 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:21,928 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:21,928 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:21,928 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:21,928 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:21,928 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:21,928 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:21,937 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 04:59:21,937 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 04:59:21,948 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 04:59:21,948 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:21,950 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:21,972 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:21,972 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:22,140 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:22,160 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:22,161 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-11-07 04:59:22,161 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:22,161 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 04:59:22,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 04:59:22,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-11-07 04:59:22,162 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 6 states. [2018-11-07 04:59:22,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:22,273 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2018-11-07 04:59:22,274 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 04:59:22,274 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-11-07 04:59:22,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:22,275 INFO L225 Difference]: With dead ends: 38 [2018-11-07 04:59:22,275 INFO L226 Difference]: Without dead ends: 33 [2018-11-07 04:59:22,275 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-11-07 04:59:22,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-11-07 04:59:22,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-11-07 04:59:22,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-11-07 04:59:22,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2018-11-07 04:59:22,281 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 20 [2018-11-07 04:59:22,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:22,282 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2018-11-07 04:59:22,282 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 04:59:22,282 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2018-11-07 04:59:22,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-11-07 04:59:22,283 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:22,283 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:22,283 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:22,283 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:22,283 INFO L82 PathProgramCache]: Analyzing trace with hash 821178397, now seen corresponding path program 3 times [2018-11-07 04:59:22,284 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:22,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:22,285 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:22,285 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:22,285 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:22,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:22,394 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:22,394 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:22,394 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:22,395 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:22,395 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:22,395 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:22,395 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:22,414 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 04:59:22,414 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 04:59:22,432 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 04:59:22,432 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:22,434 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:22,448 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:22,448 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:22,558 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:22,578 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:22,578 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-11-07 04:59:22,578 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:22,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 04:59:22,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 04:59:22,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-11-07 04:59:22,580 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 6 states. [2018-11-07 04:59:22,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:22,663 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2018-11-07 04:59:22,663 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 04:59:22,664 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-11-07 04:59:22,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:22,665 INFO L225 Difference]: With dead ends: 41 [2018-11-07 04:59:22,665 INFO L226 Difference]: Without dead ends: 36 [2018-11-07 04:59:22,666 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-11-07 04:59:22,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-11-07 04:59:22,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2018-11-07 04:59:22,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-11-07 04:59:22,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2018-11-07 04:59:22,672 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 20 [2018-11-07 04:59:22,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:22,672 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2018-11-07 04:59:22,672 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 04:59:22,672 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2018-11-07 04:59:22,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-11-07 04:59:22,673 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:22,673 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:22,674 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:22,674 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:22,674 INFO L82 PathProgramCache]: Analyzing trace with hash 427509150, now seen corresponding path program 4 times [2018-11-07 04:59:22,674 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:22,675 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:22,675 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:22,675 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:22,675 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:22,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:23,386 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:23,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:23,387 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:23,387 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:23,387 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:23,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:23,387 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:23,401 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:23,401 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 04:59:23,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:23,414 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:23,428 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:23,429 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:23,596 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:23,615 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:23,616 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-11-07 04:59:23,616 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:23,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-07 04:59:23,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-07 04:59:23,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-11-07 04:59:23,617 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 7 states. [2018-11-07 04:59:23,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:23,741 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2018-11-07 04:59:23,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-07 04:59:23,742 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-11-07 04:59:23,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:23,744 INFO L225 Difference]: With dead ends: 44 [2018-11-07 04:59:23,744 INFO L226 Difference]: Without dead ends: 39 [2018-11-07 04:59:23,745 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-11-07 04:59:23,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-11-07 04:59:23,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-11-07 04:59:23,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-11-07 04:59:23,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-11-07 04:59:23,750 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 23 [2018-11-07 04:59:23,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:23,751 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-11-07 04:59:23,751 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-07 04:59:23,751 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-11-07 04:59:23,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-11-07 04:59:23,752 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:23,752 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:23,752 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:23,752 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:23,752 INFO L82 PathProgramCache]: Analyzing trace with hash 201615134, now seen corresponding path program 4 times [2018-11-07 04:59:23,752 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:23,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:23,753 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:23,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:23,754 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:23,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:23,963 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:23,963 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:23,963 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:23,964 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:23,964 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:23,964 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:23,964 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:23,974 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:23,974 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 04:59:23,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:23,985 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:23,998 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:23,998 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:24,211 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:24,231 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:24,232 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-11-07 04:59:24,232 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:24,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-07 04:59:24,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-07 04:59:24,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-11-07 04:59:24,233 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 7 states. [2018-11-07 04:59:24,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:24,338 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2018-11-07 04:59:24,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-07 04:59:24,338 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-11-07 04:59:24,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:24,340 INFO L225 Difference]: With dead ends: 47 [2018-11-07 04:59:24,340 INFO L226 Difference]: Without dead ends: 42 [2018-11-07 04:59:24,341 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-11-07 04:59:24,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-11-07 04:59:24,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2018-11-07 04:59:24,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-11-07 04:59:24,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2018-11-07 04:59:24,349 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 23 [2018-11-07 04:59:24,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:24,350 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2018-11-07 04:59:24,350 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-07 04:59:24,350 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2018-11-07 04:59:24,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-11-07 04:59:24,351 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:24,351 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:24,352 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:24,352 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:24,352 INFO L82 PathProgramCache]: Analyzing trace with hash 181755771, now seen corresponding path program 5 times [2018-11-07 04:59:24,352 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:24,353 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:24,353 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:24,353 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:24,354 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:24,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:24,524 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:24,525 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:24,525 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:24,525 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:24,525 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:24,525 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:24,525 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:24,535 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 04:59:24,536 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 04:59:24,713 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 04:59:24,713 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:24,716 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:24,752 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:24,752 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:25,089 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:25,111 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:25,111 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-11-07 04:59:25,111 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:25,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-07 04:59:25,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-07 04:59:25,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-11-07 04:59:25,112 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 8 states. [2018-11-07 04:59:25,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:25,215 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2018-11-07 04:59:25,216 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-07 04:59:25,216 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-11-07 04:59:25,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:25,217 INFO L225 Difference]: With dead ends: 50 [2018-11-07 04:59:25,217 INFO L226 Difference]: Without dead ends: 45 [2018-11-07 04:59:25,219 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-11-07 04:59:25,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-11-07 04:59:25,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2018-11-07 04:59:25,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-11-07 04:59:25,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2018-11-07 04:59:25,225 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 26 [2018-11-07 04:59:25,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:25,226 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2018-11-07 04:59:25,226 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-07 04:59:25,226 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2018-11-07 04:59:25,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-11-07 04:59:25,227 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:25,227 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:25,227 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:25,228 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:25,228 INFO L82 PathProgramCache]: Analyzing trace with hash -1733081987, now seen corresponding path program 5 times [2018-11-07 04:59:25,228 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:25,228 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:25,229 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:25,229 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:25,229 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:25,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:25,401 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:25,401 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:25,401 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:25,401 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:25,401 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:25,402 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:25,402 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:25,412 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 04:59:25,412 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 04:59:25,484 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 04:59:25,484 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:25,486 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:25,512 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:25,513 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:26,085 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:26,105 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:26,105 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-11-07 04:59:26,106 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:26,106 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-07 04:59:26,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-07 04:59:26,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-11-07 04:59:26,107 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 8 states. [2018-11-07 04:59:26,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:26,324 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2018-11-07 04:59:26,327 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-07 04:59:26,327 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-11-07 04:59:26,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:26,328 INFO L225 Difference]: With dead ends: 53 [2018-11-07 04:59:26,328 INFO L226 Difference]: Without dead ends: 48 [2018-11-07 04:59:26,329 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-11-07 04:59:26,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-11-07 04:59:26,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2018-11-07 04:59:26,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-11-07 04:59:26,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2018-11-07 04:59:26,335 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 26 [2018-11-07 04:59:26,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:26,335 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2018-11-07 04:59:26,335 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-07 04:59:26,336 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2018-11-07 04:59:26,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-11-07 04:59:26,337 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:26,337 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:26,337 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:26,337 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:26,337 INFO L82 PathProgramCache]: Analyzing trace with hash 1862081662, now seen corresponding path program 6 times [2018-11-07 04:59:26,338 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:26,338 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:26,338 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:26,339 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:26,339 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:26,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:26,474 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:26,475 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:26,475 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:26,475 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:26,476 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:26,476 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:26,476 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:26,485 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 04:59:26,485 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 04:59:26,498 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 04:59:26,498 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:26,500 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:26,518 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:26,519 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:26,904 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:26,925 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:26,925 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-11-07 04:59:26,925 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:26,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 04:59:26,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 04:59:26,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-11-07 04:59:26,928 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 9 states. [2018-11-07 04:59:27,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:27,097 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2018-11-07 04:59:27,097 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-07 04:59:27,097 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-11-07 04:59:27,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:27,099 INFO L225 Difference]: With dead ends: 56 [2018-11-07 04:59:27,099 INFO L226 Difference]: Without dead ends: 51 [2018-11-07 04:59:27,100 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-11-07 04:59:27,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-11-07 04:59:27,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2018-11-07 04:59:27,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-11-07 04:59:27,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2018-11-07 04:59:27,106 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 29 [2018-11-07 04:59:27,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:27,122 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2018-11-07 04:59:27,122 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 04:59:27,123 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2018-11-07 04:59:27,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-11-07 04:59:27,125 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:27,125 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:27,125 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:27,126 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:27,126 INFO L82 PathProgramCache]: Analyzing trace with hash 166098622, now seen corresponding path program 6 times [2018-11-07 04:59:27,126 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:27,127 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:27,127 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:27,127 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:27,127 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:27,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:27,319 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:27,319 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:27,319 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:27,320 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:27,320 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:27,320 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:27,320 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:27,329 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 04:59:27,330 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 04:59:27,343 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 04:59:27,344 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:27,346 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:27,377 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:27,377 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:27,811 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:27,831 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:27,831 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-11-07 04:59:27,832 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:27,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 04:59:27,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 04:59:27,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-11-07 04:59:27,833 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 9 states. [2018-11-07 04:59:27,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:27,980 INFO L93 Difference]: Finished difference Result 59 states and 61 transitions. [2018-11-07 04:59:27,980 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-07 04:59:27,980 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-11-07 04:59:27,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:27,982 INFO L225 Difference]: With dead ends: 59 [2018-11-07 04:59:27,982 INFO L226 Difference]: Without dead ends: 54 [2018-11-07 04:59:27,983 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-11-07 04:59:27,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-11-07 04:59:27,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2018-11-07 04:59:27,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-11-07 04:59:27,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2018-11-07 04:59:27,989 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 29 [2018-11-07 04:59:27,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:27,989 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2018-11-07 04:59:27,989 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 04:59:27,989 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2018-11-07 04:59:27,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-11-07 04:59:27,990 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:27,991 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:27,991 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:27,991 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:27,991 INFO L82 PathProgramCache]: Analyzing trace with hash -1688101733, now seen corresponding path program 7 times [2018-11-07 04:59:27,991 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:27,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:27,992 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:27,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:27,993 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:27,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:28,170 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:28,170 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:28,170 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:28,171 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:28,171 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:28,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:28,171 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:28,184 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:28,184 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 04:59:28,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:28,210 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:28,241 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:28,242 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:28,865 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:28,887 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:28,887 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-11-07 04:59:28,887 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:28,887 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 04:59:28,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 04:59:28,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-11-07 04:59:28,888 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand 10 states. [2018-11-07 04:59:29,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:29,106 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2018-11-07 04:59:29,106 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 04:59:29,106 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-11-07 04:59:29,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:29,107 INFO L225 Difference]: With dead ends: 62 [2018-11-07 04:59:29,108 INFO L226 Difference]: Without dead ends: 57 [2018-11-07 04:59:29,108 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-11-07 04:59:29,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-07 04:59:29,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2018-11-07 04:59:29,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-11-07 04:59:29,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2018-11-07 04:59:29,115 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 32 [2018-11-07 04:59:29,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:29,115 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2018-11-07 04:59:29,115 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 04:59:29,115 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2018-11-07 04:59:29,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-11-07 04:59:29,116 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:29,117 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:29,117 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:29,117 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:29,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1051431133, now seen corresponding path program 7 times [2018-11-07 04:59:29,117 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:29,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:29,118 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:29,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:29,118 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:29,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:29,281 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:29,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:29,282 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:29,282 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:29,282 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:29,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:29,283 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:29,293 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:29,293 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 04:59:29,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:29,303 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:29,338 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:29,338 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:29,856 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:29,875 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:29,875 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-11-07 04:59:29,875 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:29,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 04:59:29,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 04:59:29,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-11-07 04:59:29,876 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 10 states. [2018-11-07 04:59:30,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:30,041 INFO L93 Difference]: Finished difference Result 65 states and 67 transitions. [2018-11-07 04:59:30,041 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 04:59:30,041 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-11-07 04:59:30,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:30,042 INFO L225 Difference]: With dead ends: 65 [2018-11-07 04:59:30,043 INFO L226 Difference]: Without dead ends: 60 [2018-11-07 04:59:30,043 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-11-07 04:59:30,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-11-07 04:59:30,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2018-11-07 04:59:30,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-11-07 04:59:30,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2018-11-07 04:59:30,050 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 32 [2018-11-07 04:59:30,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:30,050 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2018-11-07 04:59:30,050 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 04:59:30,050 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2018-11-07 04:59:30,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-11-07 04:59:30,051 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:30,052 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:30,052 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:30,052 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:30,052 INFO L82 PathProgramCache]: Analyzing trace with hash -1631958178, now seen corresponding path program 8 times [2018-11-07 04:59:30,052 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:30,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:30,053 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:30,054 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:30,054 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:30,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:30,236 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:30,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:30,237 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:30,237 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:30,237 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:30,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:30,238 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:30,245 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 04:59:30,246 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 04:59:30,939 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 04:59:30,940 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:30,946 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:31,029 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:31,029 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:33,545 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:33,570 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:33,570 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 12] total 21 [2018-11-07 04:59:33,571 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:33,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-07 04:59:33,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-07 04:59:33,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2018-11-07 04:59:33,572 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 11 states. [2018-11-07 04:59:33,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:33,805 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2018-11-07 04:59:33,807 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 04:59:33,807 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-11-07 04:59:33,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:33,808 INFO L225 Difference]: With dead ends: 68 [2018-11-07 04:59:33,809 INFO L226 Difference]: Without dead ends: 63 [2018-11-07 04:59:33,810 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 55 SyntacticMatches, 7 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2018-11-07 04:59:33,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-11-07 04:59:33,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2018-11-07 04:59:33,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-11-07 04:59:33,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2018-11-07 04:59:33,815 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 35 [2018-11-07 04:59:33,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:33,815 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2018-11-07 04:59:33,815 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-07 04:59:33,815 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2018-11-07 04:59:33,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-11-07 04:59:33,816 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:33,816 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:33,817 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:33,817 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:33,817 INFO L82 PathProgramCache]: Analyzing trace with hash 598101598, now seen corresponding path program 8 times [2018-11-07 04:59:33,817 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:33,818 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:33,818 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:33,818 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:33,818 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:33,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:34,063 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:34,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:34,064 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:34,064 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:34,064 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:34,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:34,064 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:34,075 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 04:59:34,075 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 04:59:34,478 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 04:59:34,478 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:34,483 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:34,502 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:34,502 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:35,128 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:35,148 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:35,148 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-11-07 04:59:35,148 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:35,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-07 04:59:35,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-07 04:59:35,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-11-07 04:59:35,150 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 11 states. [2018-11-07 04:59:35,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:35,329 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2018-11-07 04:59:35,330 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 04:59:35,330 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-11-07 04:59:35,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:35,331 INFO L225 Difference]: With dead ends: 71 [2018-11-07 04:59:35,331 INFO L226 Difference]: Without dead ends: 66 [2018-11-07 04:59:35,331 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-11-07 04:59:35,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-11-07 04:59:35,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2018-11-07 04:59:35,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-11-07 04:59:35,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2018-11-07 04:59:35,336 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 35 [2018-11-07 04:59:35,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:35,337 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2018-11-07 04:59:35,337 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-07 04:59:35,337 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2018-11-07 04:59:35,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-11-07 04:59:35,338 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:35,338 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:35,338 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:35,338 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:35,338 INFO L82 PathProgramCache]: Analyzing trace with hash 198410683, now seen corresponding path program 9 times [2018-11-07 04:59:35,338 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:35,339 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:35,339 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:35,339 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:35,339 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:35,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:35,628 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:35,628 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:35,628 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:35,628 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:35,628 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:35,628 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:35,629 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:35,639 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 04:59:35,639 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 04:59:35,655 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 04:59:35,655 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:35,656 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:35,670 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:35,671 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:36,350 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:36,370 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:36,371 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-11-07 04:59:36,371 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:36,371 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-07 04:59:36,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-07 04:59:36,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-11-07 04:59:36,372 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand 12 states. [2018-11-07 04:59:36,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:36,735 INFO L93 Difference]: Finished difference Result 74 states and 76 transitions. [2018-11-07 04:59:36,736 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-07 04:59:36,736 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-11-07 04:59:36,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:36,737 INFO L225 Difference]: With dead ends: 74 [2018-11-07 04:59:36,737 INFO L226 Difference]: Without dead ends: 69 [2018-11-07 04:59:36,738 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-11-07 04:59:36,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-11-07 04:59:36,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2018-11-07 04:59:36,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-11-07 04:59:36,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2018-11-07 04:59:36,742 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 38 [2018-11-07 04:59:36,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:36,742 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2018-11-07 04:59:36,742 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-07 04:59:36,742 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2018-11-07 04:59:36,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-11-07 04:59:36,743 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:36,743 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:36,743 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:36,744 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:36,744 INFO L82 PathProgramCache]: Analyzing trace with hash -1164896963, now seen corresponding path program 9 times [2018-11-07 04:59:36,744 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:36,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:36,745 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:36,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:36,745 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:36,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:36,950 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:36,950 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:36,951 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:36,951 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:36,951 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:36,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:36,951 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:36,960 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 04:59:36,960 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 04:59:36,972 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 04:59:36,972 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:36,974 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:36,992 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:36,993 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:37,745 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:37,765 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:37,765 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-11-07 04:59:37,765 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:37,766 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-07 04:59:37,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-07 04:59:37,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-11-07 04:59:37,766 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 12 states. [2018-11-07 04:59:37,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:37,977 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2018-11-07 04:59:37,980 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-07 04:59:37,981 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-11-07 04:59:37,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:37,981 INFO L225 Difference]: With dead ends: 77 [2018-11-07 04:59:37,981 INFO L226 Difference]: Without dead ends: 72 [2018-11-07 04:59:37,982 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-11-07 04:59:37,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-11-07 04:59:37,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2018-11-07 04:59:37,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-11-07 04:59:37,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2018-11-07 04:59:37,986 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 38 [2018-11-07 04:59:37,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:37,987 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2018-11-07 04:59:37,987 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-07 04:59:37,987 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2018-11-07 04:59:37,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-11-07 04:59:37,987 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:37,988 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:37,988 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:37,988 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:37,988 INFO L82 PathProgramCache]: Analyzing trace with hash -187641282, now seen corresponding path program 10 times [2018-11-07 04:59:37,988 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:37,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:37,989 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:37,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:37,989 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:38,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:38,773 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:38,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:38,773 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:38,774 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:38,774 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:38,774 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:38,774 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:38,782 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:38,782 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 04:59:38,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:38,797 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:38,827 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:38,828 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:40,033 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:40,053 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:40,054 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-11-07 04:59:40,054 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:40,054 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 04:59:40,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 04:59:40,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-11-07 04:59:40,055 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand 13 states. [2018-11-07 04:59:40,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:40,338 INFO L93 Difference]: Finished difference Result 80 states and 82 transitions. [2018-11-07 04:59:40,339 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 04:59:40,339 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-11-07 04:59:40,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:40,340 INFO L225 Difference]: With dead ends: 80 [2018-11-07 04:59:40,340 INFO L226 Difference]: Without dead ends: 75 [2018-11-07 04:59:40,341 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-11-07 04:59:40,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-11-07 04:59:40,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2018-11-07 04:59:40,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-11-07 04:59:40,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2018-11-07 04:59:40,347 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 41 [2018-11-07 04:59:40,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:40,347 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2018-11-07 04:59:40,347 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 04:59:40,347 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2018-11-07 04:59:40,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-11-07 04:59:40,348 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:40,348 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:40,348 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:40,349 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:40,349 INFO L82 PathProgramCache]: Analyzing trace with hash 500035070, now seen corresponding path program 10 times [2018-11-07 04:59:40,349 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:40,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:40,350 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:40,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:40,350 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:40,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:40,758 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:40,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:40,759 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:40,759 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:40,759 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:40,759 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:40,759 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:40,771 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:40,771 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 04:59:40,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:40,787 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:40,802 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:40,802 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:41,863 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:41,882 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:41,882 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-11-07 04:59:41,882 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:41,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 04:59:41,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 04:59:41,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-11-07 04:59:41,884 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 13 states. [2018-11-07 04:59:42,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:42,182 INFO L93 Difference]: Finished difference Result 83 states and 85 transitions. [2018-11-07 04:59:42,184 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 04:59:42,184 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-11-07 04:59:42,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:42,185 INFO L225 Difference]: With dead ends: 83 [2018-11-07 04:59:42,185 INFO L226 Difference]: Without dead ends: 78 [2018-11-07 04:59:42,185 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-11-07 04:59:42,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-11-07 04:59:42,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2018-11-07 04:59:42,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-11-07 04:59:42,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2018-11-07 04:59:42,189 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 41 [2018-11-07 04:59:42,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:42,189 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2018-11-07 04:59:42,189 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 04:59:42,189 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2018-11-07 04:59:42,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-11-07 04:59:42,190 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:42,190 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:42,190 INFO L423 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:42,190 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:42,190 INFO L82 PathProgramCache]: Analyzing trace with hash 860688091, now seen corresponding path program 11 times [2018-11-07 04:59:42,190 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:42,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:42,191 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:42,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:42,191 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:42,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:42,449 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:42,449 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:42,450 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:42,450 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:42,450 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:42,450 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:42,450 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:42,458 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 04:59:42,458 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 04:59:42,821 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-07 04:59:42,821 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:42,826 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:42,849 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:42,849 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:44,112 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:44,132 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:44,132 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-11-07 04:59:44,132 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:44,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 04:59:44,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 04:59:44,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-11-07 04:59:44,133 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand 14 states. [2018-11-07 04:59:44,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:44,817 INFO L93 Difference]: Finished difference Result 86 states and 88 transitions. [2018-11-07 04:59:44,817 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 04:59:44,818 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-11-07 04:59:44,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:44,819 INFO L225 Difference]: With dead ends: 86 [2018-11-07 04:59:44,819 INFO L226 Difference]: Without dead ends: 81 [2018-11-07 04:59:44,820 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-11-07 04:59:44,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-11-07 04:59:44,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2018-11-07 04:59:44,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-11-07 04:59:44,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2018-11-07 04:59:44,824 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 44 [2018-11-07 04:59:44,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:44,824 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2018-11-07 04:59:44,824 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 04:59:44,824 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2018-11-07 04:59:44,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-11-07 04:59:44,825 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:44,825 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:44,825 INFO L423 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:44,825 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:44,825 INFO L82 PathProgramCache]: Analyzing trace with hash -2087071331, now seen corresponding path program 11 times [2018-11-07 04:59:44,826 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:44,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:44,826 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:44,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:44,826 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:44,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:45,175 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:45,176 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:45,176 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:45,176 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:45,176 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:45,176 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:45,176 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:45,190 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 04:59:45,190 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 04:59:45,674 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-07 04:59:45,674 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:45,678 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:45,690 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:45,690 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:46,696 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:46,716 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:46,716 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-11-07 04:59:46,716 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:46,716 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 04:59:46,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 04:59:46,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-11-07 04:59:46,717 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 14 states. [2018-11-07 04:59:47,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:47,072 INFO L93 Difference]: Finished difference Result 89 states and 91 transitions. [2018-11-07 04:59:47,073 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 04:59:47,073 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-11-07 04:59:47,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:47,074 INFO L225 Difference]: With dead ends: 89 [2018-11-07 04:59:47,074 INFO L226 Difference]: Without dead ends: 84 [2018-11-07 04:59:47,075 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-11-07 04:59:47,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-11-07 04:59:47,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2018-11-07 04:59:47,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-11-07 04:59:47,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2018-11-07 04:59:47,080 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 44 [2018-11-07 04:59:47,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:47,080 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2018-11-07 04:59:47,081 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 04:59:47,081 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2018-11-07 04:59:47,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-11-07 04:59:47,081 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:47,081 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:47,082 INFO L423 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:47,082 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:47,082 INFO L82 PathProgramCache]: Analyzing trace with hash -1361137378, now seen corresponding path program 12 times [2018-11-07 04:59:47,082 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:47,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:47,083 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:47,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:47,083 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:47,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:47,345 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:47,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:47,346 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:47,346 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:47,346 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:47,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:47,346 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:47,354 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 04:59:47,354 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 04:59:47,371 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 04:59:47,371 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:47,372 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:47,396 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:47,396 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:48,708 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:48,727 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:48,728 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-11-07 04:59:48,728 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:48,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-07 04:59:48,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-07 04:59:48,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-11-07 04:59:48,729 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand 15 states. [2018-11-07 04:59:49,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:49,064 INFO L93 Difference]: Finished difference Result 92 states and 94 transitions. [2018-11-07 04:59:49,064 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-07 04:59:49,065 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-11-07 04:59:49,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:49,066 INFO L225 Difference]: With dead ends: 92 [2018-11-07 04:59:49,066 INFO L226 Difference]: Without dead ends: 87 [2018-11-07 04:59:49,067 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-11-07 04:59:49,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-11-07 04:59:49,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2018-11-07 04:59:49,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-11-07 04:59:49,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2018-11-07 04:59:49,072 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 47 [2018-11-07 04:59:49,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:49,073 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2018-11-07 04:59:49,073 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-07 04:59:49,073 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2018-11-07 04:59:49,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-11-07 04:59:49,073 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:49,074 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:49,074 INFO L423 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:49,074 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:49,074 INFO L82 PathProgramCache]: Analyzing trace with hash -1385736802, now seen corresponding path program 12 times [2018-11-07 04:59:49,074 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:49,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:49,075 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:49,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:49,075 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:49,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:49,287 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:49,287 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:49,287 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:49,287 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:49,287 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:49,288 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:49,288 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:49,297 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 04:59:49,298 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 04:59:49,313 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 04:59:49,313 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:49,314 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:49,345 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:49,345 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:50,829 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:50,849 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:50,850 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-11-07 04:59:50,850 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:50,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-07 04:59:50,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-07 04:59:50,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-11-07 04:59:50,851 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 15 states. [2018-11-07 04:59:51,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:51,132 INFO L93 Difference]: Finished difference Result 95 states and 97 transitions. [2018-11-07 04:59:51,132 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-07 04:59:51,133 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-11-07 04:59:51,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:51,134 INFO L225 Difference]: With dead ends: 95 [2018-11-07 04:59:51,134 INFO L226 Difference]: Without dead ends: 90 [2018-11-07 04:59:51,135 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-11-07 04:59:51,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-11-07 04:59:51,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2018-11-07 04:59:51,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-11-07 04:59:51,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2018-11-07 04:59:51,140 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 47 [2018-11-07 04:59:51,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:51,140 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2018-11-07 04:59:51,140 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-07 04:59:51,140 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2018-11-07 04:59:51,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-11-07 04:59:51,141 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:51,141 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:51,141 INFO L423 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:51,141 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:51,141 INFO L82 PathProgramCache]: Analyzing trace with hash -2022685701, now seen corresponding path program 13 times [2018-11-07 04:59:51,141 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:51,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:51,142 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:51,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:51,142 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:51,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:52,880 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:52,881 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:52,881 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:52,881 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:52,881 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:52,881 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:52,881 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:52,891 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:52,891 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 04:59:52,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:52,909 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:52,940 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:52,940 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:54,802 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:54,821 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:54,821 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-11-07 04:59:54,821 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:54,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 04:59:54,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 04:59:54,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-11-07 04:59:54,822 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand 16 states. [2018-11-07 04:59:55,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:55,421 INFO L93 Difference]: Finished difference Result 98 states and 100 transitions. [2018-11-07 04:59:55,421 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 04:59:55,421 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-11-07 04:59:55,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:55,423 INFO L225 Difference]: With dead ends: 98 [2018-11-07 04:59:55,423 INFO L226 Difference]: Without dead ends: 93 [2018-11-07 04:59:55,424 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-11-07 04:59:55,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-11-07 04:59:55,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2018-11-07 04:59:55,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-11-07 04:59:55,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2018-11-07 04:59:55,428 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 50 [2018-11-07 04:59:55,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:55,429 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2018-11-07 04:59:55,429 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 04:59:55,429 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2018-11-07 04:59:55,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-11-07 04:59:55,430 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:55,430 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:55,430 INFO L423 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:55,430 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:55,431 INFO L82 PathProgramCache]: Analyzing trace with hash 1350288893, now seen corresponding path program 13 times [2018-11-07 04:59:55,431 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:55,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:55,432 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:55,432 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:55,432 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:55,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:56,494 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:56,494 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:56,495 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:56,495 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:56,495 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:56,495 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:56,495 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:56,508 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:56,508 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 04:59:56,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:56,526 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:56,539 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:56,539 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:57,986 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:58,005 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:58,006 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-11-07 04:59:58,006 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:58,006 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 04:59:58,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 04:59:58,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-11-07 04:59:58,007 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand 16 states. [2018-11-07 04:59:58,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:58,349 INFO L93 Difference]: Finished difference Result 101 states and 103 transitions. [2018-11-07 04:59:58,349 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 04:59:58,350 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-11-07 04:59:58,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:58,350 INFO L225 Difference]: With dead ends: 101 [2018-11-07 04:59:58,351 INFO L226 Difference]: Without dead ends: 96 [2018-11-07 04:59:58,352 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-11-07 04:59:58,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-11-07 04:59:58,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2018-11-07 04:59:58,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-11-07 04:59:58,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2018-11-07 04:59:58,356 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 50 [2018-11-07 04:59:58,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:58,357 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2018-11-07 04:59:58,357 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 04:59:58,357 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2018-11-07 04:59:58,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-11-07 04:59:58,358 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:58,358 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:58,358 INFO L423 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:58,358 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:58,358 INFO L82 PathProgramCache]: Analyzing trace with hash -603854850, now seen corresponding path program 14 times [2018-11-07 04:59:58,358 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:58,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:58,359 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:58,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:58,359 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:58,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:59,157 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:59,157 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:59,157 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:59,157 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:59,157 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:59,158 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:59,158 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:59,166 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 04:59:59,166 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:00:04,424 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-07 05:00:04,424 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:00:04,460 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:00:04,474 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:04,474 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:00:06,419 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:06,440 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:00:06,440 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-11-07 05:00:06,440 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:00:06,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-07 05:00:06,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-07 05:00:06,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-11-07 05:00:06,441 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand 17 states. [2018-11-07 05:00:06,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:00:06,961 INFO L93 Difference]: Finished difference Result 104 states and 106 transitions. [2018-11-07 05:00:06,962 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 05:00:06,962 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-11-07 05:00:06,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:00:06,963 INFO L225 Difference]: With dead ends: 104 [2018-11-07 05:00:06,963 INFO L226 Difference]: Without dead ends: 99 [2018-11-07 05:00:06,964 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-11-07 05:00:06,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-11-07 05:00:06,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2018-11-07 05:00:06,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-11-07 05:00:06,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 100 transitions. [2018-11-07 05:00:06,968 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 100 transitions. Word has length 53 [2018-11-07 05:00:06,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:00:06,968 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 100 transitions. [2018-11-07 05:00:06,968 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-07 05:00:06,968 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 100 transitions. [2018-11-07 05:00:06,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-11-07 05:00:06,969 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:00:06,969 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:00:06,969 INFO L423 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:00:06,969 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:00:06,970 INFO L82 PathProgramCache]: Analyzing trace with hash 402425150, now seen corresponding path program 14 times [2018-11-07 05:00:06,970 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:00:06,970 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:06,970 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:00:06,970 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:06,970 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:00:06,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:00:07,572 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:07,572 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:07,572 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:00:07,572 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:00:07,572 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:00:07,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:07,573 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:00:07,582 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:00:07,582 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:00:09,797 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-07 05:00:09,798 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:00:09,811 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:00:09,830 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:09,831 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:00:11,675 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:11,696 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:00:11,696 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-11-07 05:00:11,696 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:00:11,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-07 05:00:11,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-07 05:00:11,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-11-07 05:00:11,697 INFO L87 Difference]: Start difference. First operand 98 states and 100 transitions. Second operand 17 states. [2018-11-07 05:00:12,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:00:12,063 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2018-11-07 05:00:12,063 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 05:00:12,063 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-11-07 05:00:12,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:00:12,065 INFO L225 Difference]: With dead ends: 107 [2018-11-07 05:00:12,065 INFO L226 Difference]: Without dead ends: 102 [2018-11-07 05:00:12,066 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-11-07 05:00:12,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-11-07 05:00:12,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2018-11-07 05:00:12,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-11-07 05:00:12,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2018-11-07 05:00:12,071 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 53 [2018-11-07 05:00:12,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:00:12,072 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2018-11-07 05:00:12,072 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-07 05:00:12,072 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2018-11-07 05:00:12,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-11-07 05:00:12,073 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:00:12,073 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:00:12,073 INFO L423 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:00:12,073 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:00:12,073 INFO L82 PathProgramCache]: Analyzing trace with hash 1012867355, now seen corresponding path program 15 times [2018-11-07 05:00:12,074 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:00:12,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:12,074 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:00:12,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:12,075 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:00:12,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:00:12,340 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:12,340 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:12,341 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:00:12,341 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:00:12,341 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:00:12,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:12,341 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:00:12,350 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:00:12,350 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:00:12,373 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:00:12,373 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:00:12,375 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:00:12,391 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:12,391 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:00:14,733 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:14,753 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:00:14,754 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-11-07 05:00:14,754 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:00:14,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-07 05:00:14,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-07 05:00:14,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 05:00:14,755 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand 18 states. [2018-11-07 05:00:15,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:00:15,293 INFO L93 Difference]: Finished difference Result 110 states and 112 transitions. [2018-11-07 05:00:15,293 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-07 05:00:15,293 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-11-07 05:00:15,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:00:15,295 INFO L225 Difference]: With dead ends: 110 [2018-11-07 05:00:15,295 INFO L226 Difference]: Without dead ends: 105 [2018-11-07 05:00:15,296 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 05:00:15,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-11-07 05:00:15,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 104. [2018-11-07 05:00:15,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2018-11-07 05:00:15,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 106 transitions. [2018-11-07 05:00:15,301 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 106 transitions. Word has length 56 [2018-11-07 05:00:15,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:00:15,301 INFO L480 AbstractCegarLoop]: Abstraction has 104 states and 106 transitions. [2018-11-07 05:00:15,301 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-07 05:00:15,302 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 106 transitions. [2018-11-07 05:00:15,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-11-07 05:00:15,302 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:00:15,302 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:00:15,303 INFO L423 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:00:15,303 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:00:15,303 INFO L82 PathProgramCache]: Analyzing trace with hash 2003628637, now seen corresponding path program 15 times [2018-11-07 05:00:15,303 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:00:15,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:15,304 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:00:15,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:15,304 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:00:15,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:00:15,603 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:15,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:15,604 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:00:15,604 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:00:15,604 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:00:15,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:15,604 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:00:15,612 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:00:15,612 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:00:15,629 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:00:15,629 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:00:15,631 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:00:15,643 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:15,644 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:00:17,468 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:17,489 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:00:17,489 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-11-07 05:00:17,489 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:00:17,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-07 05:00:17,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-07 05:00:17,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 05:00:17,490 INFO L87 Difference]: Start difference. First operand 104 states and 106 transitions. Second operand 18 states. [2018-11-07 05:00:17,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:00:17,908 INFO L93 Difference]: Finished difference Result 113 states and 115 transitions. [2018-11-07 05:00:17,908 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-07 05:00:17,908 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-11-07 05:00:17,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:00:17,909 INFO L225 Difference]: With dead ends: 113 [2018-11-07 05:00:17,909 INFO L226 Difference]: Without dead ends: 108 [2018-11-07 05:00:17,910 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 05:00:17,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2018-11-07 05:00:17,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2018-11-07 05:00:17,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-11-07 05:00:17,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2018-11-07 05:00:17,915 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 56 [2018-11-07 05:00:17,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:00:17,916 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2018-11-07 05:00:17,916 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-07 05:00:17,916 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2018-11-07 05:00:17,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-11-07 05:00:17,916 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:00:17,916 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:00:17,916 INFO L423 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:00:17,917 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:00:17,917 INFO L82 PathProgramCache]: Analyzing trace with hash 1020819166, now seen corresponding path program 16 times [2018-11-07 05:00:17,917 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:00:17,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:17,917 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:00:17,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:17,917 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:00:17,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:00:19,111 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:19,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:19,112 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:00:19,112 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:00:19,112 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:00:19,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:19,112 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:00:19,120 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:00:19,120 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:00:19,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:00:19,143 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:00:19,154 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:19,154 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:00:21,672 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:21,693 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:00:21,693 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-11-07 05:00:21,693 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:00:21,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 05:00:21,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 05:00:21,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 05:00:21,694 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand 19 states. [2018-11-07 05:00:22,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:00:22,255 INFO L93 Difference]: Finished difference Result 116 states and 118 transitions. [2018-11-07 05:00:22,256 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 05:00:22,256 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-11-07 05:00:22,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:00:22,257 INFO L225 Difference]: With dead ends: 116 [2018-11-07 05:00:22,257 INFO L226 Difference]: Without dead ends: 111 [2018-11-07 05:00:22,258 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 05:00:22,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-11-07 05:00:22,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 110. [2018-11-07 05:00:22,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-11-07 05:00:22,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 112 transitions. [2018-11-07 05:00:22,264 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 112 transitions. Word has length 59 [2018-11-07 05:00:22,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:00:22,264 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 112 transitions. [2018-11-07 05:00:22,264 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 05:00:22,264 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 112 transitions. [2018-11-07 05:00:22,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-11-07 05:00:22,265 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:00:22,265 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:00:22,265 INFO L423 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:00:22,265 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:00:22,266 INFO L82 PathProgramCache]: Analyzing trace with hash -745046818, now seen corresponding path program 16 times [2018-11-07 05:00:22,266 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:00:22,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:22,266 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:00:22,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:22,267 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:00:22,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:00:22,697 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:22,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:22,698 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:00:22,698 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:00:22,698 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:00:22,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:22,698 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:00:22,709 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:00:22,710 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:00:22,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:00:22,728 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:00:22,762 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:22,762 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:00:24,807 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:24,828 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:00:24,828 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-11-07 05:00:24,828 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:00:24,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 05:00:24,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 05:00:24,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 05:00:24,829 INFO L87 Difference]: Start difference. First operand 110 states and 112 transitions. Second operand 19 states. [2018-11-07 05:00:25,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:00:25,343 INFO L93 Difference]: Finished difference Result 119 states and 121 transitions. [2018-11-07 05:00:25,344 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 05:00:25,344 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-11-07 05:00:25,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:00:25,345 INFO L225 Difference]: With dead ends: 119 [2018-11-07 05:00:25,346 INFO L226 Difference]: Without dead ends: 114 [2018-11-07 05:00:25,347 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 05:00:25,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-11-07 05:00:25,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2018-11-07 05:00:25,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2018-11-07 05:00:25,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 115 transitions. [2018-11-07 05:00:25,352 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 115 transitions. Word has length 59 [2018-11-07 05:00:25,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:00:25,352 INFO L480 AbstractCegarLoop]: Abstraction has 113 states and 115 transitions. [2018-11-07 05:00:25,352 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 05:00:25,352 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 115 transitions. [2018-11-07 05:00:25,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-11-07 05:00:25,353 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:00:25,353 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:00:25,353 INFO L423 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:00:25,353 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:00:25,353 INFO L82 PathProgramCache]: Analyzing trace with hash 1690019387, now seen corresponding path program 17 times [2018-11-07 05:00:25,354 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:00:25,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:25,354 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:00:25,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:25,354 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:00:25,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:00:25,696 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:25,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:25,697 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:00:25,697 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:00:25,697 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:00:25,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:25,697 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:00:25,705 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:00:25,705 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:00:38,980 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-11-07 05:00:38,981 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:00:39,086 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:00:39,100 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:39,100 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:00:41,887 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:41,909 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:00:41,909 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-11-07 05:00:41,909 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:00:41,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-07 05:00:41,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-07 05:00:41,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 05:00:41,910 INFO L87 Difference]: Start difference. First operand 113 states and 115 transitions. Second operand 20 states. [2018-11-07 05:00:42,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:00:42,528 INFO L93 Difference]: Finished difference Result 122 states and 124 transitions. [2018-11-07 05:00:42,529 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-07 05:00:42,529 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-11-07 05:00:42,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:00:42,530 INFO L225 Difference]: With dead ends: 122 [2018-11-07 05:00:42,530 INFO L226 Difference]: Without dead ends: 117 [2018-11-07 05:00:42,530 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 05:00:42,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-11-07 05:00:42,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2018-11-07 05:00:42,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2018-11-07 05:00:42,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 118 transitions. [2018-11-07 05:00:42,534 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 118 transitions. Word has length 62 [2018-11-07 05:00:42,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:00:42,534 INFO L480 AbstractCegarLoop]: Abstraction has 116 states and 118 transitions. [2018-11-07 05:00:42,534 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-07 05:00:42,534 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 118 transitions. [2018-11-07 05:00:42,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-11-07 05:00:42,535 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:00:42,535 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:00:42,535 INFO L423 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:00:42,535 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:00:42,536 INFO L82 PathProgramCache]: Analyzing trace with hash 1310938813, now seen corresponding path program 17 times [2018-11-07 05:00:42,536 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:00:42,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:42,537 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:00:42,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:42,537 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:00:42,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:00:42,955 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:42,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:42,955 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:00:42,956 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:00:42,956 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:00:42,956 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:42,956 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:00:42,964 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:00:42,965 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:00:54,875 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-11-07 05:00:54,875 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:00:54,940 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:00:54,960 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:54,960 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:00:57,470 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:57,490 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:00:57,491 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-11-07 05:00:57,491 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:00:57,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-07 05:00:57,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-07 05:00:57,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 05:00:57,492 INFO L87 Difference]: Start difference. First operand 116 states and 118 transitions. Second operand 20 states. [2018-11-07 05:00:57,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:00:57,967 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2018-11-07 05:00:57,967 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-07 05:00:57,968 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-11-07 05:00:57,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:00:57,969 INFO L225 Difference]: With dead ends: 125 [2018-11-07 05:00:57,969 INFO L226 Difference]: Without dead ends: 120 [2018-11-07 05:00:57,969 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 05:00:57,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-11-07 05:00:57,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2018-11-07 05:00:57,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-11-07 05:00:57,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2018-11-07 05:00:57,973 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 62 [2018-11-07 05:00:57,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:00:57,973 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2018-11-07 05:00:57,973 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-07 05:00:57,973 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2018-11-07 05:00:57,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-11-07 05:00:57,974 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:00:57,974 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:00:57,974 INFO L423 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:00:57,975 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:00:57,975 INFO L82 PathProgramCache]: Analyzing trace with hash 595615166, now seen corresponding path program 18 times [2018-11-07 05:00:57,975 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:00:57,975 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:57,975 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:00:57,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:57,976 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:00:57,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:00:58,647 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:58,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:58,647 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:00:58,648 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:00:58,648 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:00:58,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:58,648 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:00:58,658 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:00:58,658 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:00:58,687 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:00:58,687 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:00:58,689 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:00:58,721 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:00:58,721 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:01:01,579 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:01:01,599 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:01:01,599 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-11-07 05:01:01,599 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:01:01,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-07 05:01:01,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-07 05:01:01,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 05:01:01,600 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand 21 states. [2018-11-07 05:01:02,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:01:02,321 INFO L93 Difference]: Finished difference Result 128 states and 130 transitions. [2018-11-07 05:01:02,321 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-07 05:01:02,322 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-11-07 05:01:02,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:01:02,323 INFO L225 Difference]: With dead ends: 128 [2018-11-07 05:01:02,323 INFO L226 Difference]: Without dead ends: 123 [2018-11-07 05:01:02,323 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 05:01:02,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-11-07 05:01:02,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2018-11-07 05:01:02,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-11-07 05:01:02,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 124 transitions. [2018-11-07 05:01:02,329 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 124 transitions. Word has length 65 [2018-11-07 05:01:02,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:01:02,329 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 124 transitions. [2018-11-07 05:01:02,329 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-07 05:01:02,329 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 124 transitions. [2018-11-07 05:01:02,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-11-07 05:01:02,330 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:01:02,330 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:01:02,330 INFO L423 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:01:02,330 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:01:02,331 INFO L82 PathProgramCache]: Analyzing trace with hash 650263678, now seen corresponding path program 18 times [2018-11-07 05:01:02,331 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:01:02,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:01:02,331 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:01:02,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:01:02,332 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:01:02,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:01:02,750 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:01:02,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:01:02,750 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:01:02,750 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:01:02,750 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:01:02,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:01:02,750 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:01:02,759 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:01:02,759 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:01:02,778 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:01:02,778 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:01:02,779 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:01:02,807 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:01:02,807 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:01:05,557 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:01:05,577 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:01:05,577 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-11-07 05:01:05,577 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:01:05,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-07 05:01:05,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-07 05:01:05,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 05:01:05,578 INFO L87 Difference]: Start difference. First operand 122 states and 124 transitions. Second operand 21 states. [2018-11-07 05:01:06,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:01:06,143 INFO L93 Difference]: Finished difference Result 131 states and 133 transitions. [2018-11-07 05:01:06,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-07 05:01:06,143 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-11-07 05:01:06,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:01:06,145 INFO L225 Difference]: With dead ends: 131 [2018-11-07 05:01:06,145 INFO L226 Difference]: Without dead ends: 126 [2018-11-07 05:01:06,146 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 05:01:06,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-11-07 05:01:06,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2018-11-07 05:01:06,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2018-11-07 05:01:06,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 127 transitions. [2018-11-07 05:01:06,152 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 127 transitions. Word has length 65 [2018-11-07 05:01:06,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:01:06,153 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 127 transitions. [2018-11-07 05:01:06,153 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-07 05:01:06,153 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 127 transitions. [2018-11-07 05:01:06,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-11-07 05:01:06,153 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:01:06,154 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:01:06,154 INFO L423 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:01:06,154 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:01:06,154 INFO L82 PathProgramCache]: Analyzing trace with hash 296211291, now seen corresponding path program 19 times [2018-11-07 05:01:06,154 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:01:06,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:01:06,155 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:01:06,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:01:06,155 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:01:06,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:01:06,532 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:01:06,532 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:01:06,532 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:01:06,532 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:01:06,533 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:01:06,533 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:01:06,533 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:01:06,542 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:01:06,542 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:01:06,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:01:06,564 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:01:06,576 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:01:06,576 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:01:09,233 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:01:09,252 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:01:09,252 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-11-07 05:01:09,252 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:01:09,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-07 05:01:09,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-07 05:01:09,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-11-07 05:01:09,253 INFO L87 Difference]: Start difference. First operand 125 states and 127 transitions. Second operand 22 states. [2018-11-07 05:01:11,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:01:11,528 INFO L93 Difference]: Finished difference Result 134 states and 136 transitions. [2018-11-07 05:01:11,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-07 05:01:11,529 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-11-07 05:01:11,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:01:11,529 INFO L225 Difference]: With dead ends: 134 [2018-11-07 05:01:11,530 INFO L226 Difference]: Without dead ends: 129 [2018-11-07 05:01:11,530 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-11-07 05:01:11,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-11-07 05:01:11,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 128. [2018-11-07 05:01:11,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-11-07 05:01:11,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 130 transitions. [2018-11-07 05:01:11,536 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 130 transitions. Word has length 68 [2018-11-07 05:01:11,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:01:11,537 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 130 transitions. [2018-11-07 05:01:11,537 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-07 05:01:11,537 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 130 transitions. [2018-11-07 05:01:11,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-11-07 05:01:11,537 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:01:11,538 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:01:11,538 INFO L423 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:01:11,538 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:01:11,538 INFO L82 PathProgramCache]: Analyzing trace with hash -1982532835, now seen corresponding path program 19 times [2018-11-07 05:01:11,538 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:01:11,539 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:01:11,539 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:01:11,539 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:01:11,539 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:01:11,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:01:12,226 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:01:12,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:01:12,227 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:01:12,227 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:01:12,227 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:01:12,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:01:12,227 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:01:12,236 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:01:12,237 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:01:12,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:01:12,255 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:01:12,270 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:01:12,271 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:01:15,357 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:01:15,377 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:01:15,377 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-11-07 05:01:15,377 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:01:15,378 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-07 05:01:15,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-07 05:01:15,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-11-07 05:01:15,379 INFO L87 Difference]: Start difference. First operand 128 states and 130 transitions. Second operand 22 states. [2018-11-07 05:01:16,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:01:16,074 INFO L93 Difference]: Finished difference Result 137 states and 139 transitions. [2018-11-07 05:01:16,075 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-07 05:01:16,075 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-11-07 05:01:16,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:01:16,076 INFO L225 Difference]: With dead ends: 137 [2018-11-07 05:01:16,076 INFO L226 Difference]: Without dead ends: 132 [2018-11-07 05:01:16,077 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-11-07 05:01:16,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-11-07 05:01:16,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131. [2018-11-07 05:01:16,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-11-07 05:01:16,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2018-11-07 05:01:16,083 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 68 [2018-11-07 05:01:16,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:01:16,084 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2018-11-07 05:01:16,084 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-07 05:01:16,084 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2018-11-07 05:01:16,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-11-07 05:01:16,085 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:01:16,085 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:01:16,085 INFO L423 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:01:16,085 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:01:16,085 INFO L82 PathProgramCache]: Analyzing trace with hash 1402444958, now seen corresponding path program 20 times [2018-11-07 05:01:16,085 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:01:16,086 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:01:16,086 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:01:16,086 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:01:16,086 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:01:16,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:01:16,565 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:01:16,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:01:16,565 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:01:16,565 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:01:16,565 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:01:16,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:01:16,566 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:01:16,577 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:01:16,577 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:01:26,718 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-11-07 05:01:26,718 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:01:26,757 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:01:26,849 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:01:26,850 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:01:53,123 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:01:53,143 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:01:53,143 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 24] total 45 [2018-11-07 05:01:53,143 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:01:53,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-07 05:01:53,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-07 05:01:53,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=550, Invalid=1423, Unknown=7, NotChecked=0, Total=1980 [2018-11-07 05:01:53,144 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand 23 states. [2018-11-07 05:01:53,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:01:53,976 INFO L93 Difference]: Finished difference Result 140 states and 142 transitions. [2018-11-07 05:01:53,976 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-07 05:01:53,976 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 71 [2018-11-07 05:01:53,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:01:53,977 INFO L225 Difference]: With dead ends: 140 [2018-11-07 05:01:53,978 INFO L226 Difference]: Without dead ends: 135 [2018-11-07 05:01:53,978 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 117 SyntacticMatches, 5 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 26.7s TimeCoverageRelationStatistics Valid=550, Invalid=1423, Unknown=7, NotChecked=0, Total=1980 [2018-11-07 05:01:53,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-11-07 05:01:53,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 134. [2018-11-07 05:01:53,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2018-11-07 05:01:53,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 136 transitions. [2018-11-07 05:01:53,984 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 136 transitions. Word has length 71 [2018-11-07 05:01:53,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:01:53,985 INFO L480 AbstractCegarLoop]: Abstraction has 134 states and 136 transitions. [2018-11-07 05:01:53,985 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-07 05:01:53,985 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 136 transitions. [2018-11-07 05:01:53,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-11-07 05:01:53,986 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:01:53,986 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:01:53,986 INFO L423 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:01:53,986 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:01:53,986 INFO L82 PathProgramCache]: Analyzing trace with hash -930692066, now seen corresponding path program 20 times [2018-11-07 05:01:53,986 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:01:53,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:01:53,987 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:01:53,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:01:53,987 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:01:53,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:01:54,593 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:01:54,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:01:54,593 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:01:54,593 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:01:54,593 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:01:54,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:01:54,593 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:01:54,603 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:01:54,603 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:02:08,838 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-11-07 05:02:08,839 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:02:08,865 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:02:08,886 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:02:08,887 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:02:12,284 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:02:12,304 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:02:12,305 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-11-07 05:02:12,305 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:02:12,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-07 05:02:12,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-07 05:02:12,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1366, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 05:02:12,306 INFO L87 Difference]: Start difference. First operand 134 states and 136 transitions. Second operand 23 states. [2018-11-07 05:02:12,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:02:12,949 INFO L93 Difference]: Finished difference Result 143 states and 145 transitions. [2018-11-07 05:02:12,949 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-07 05:02:12,950 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 71 [2018-11-07 05:02:12,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:02:12,951 INFO L225 Difference]: With dead ends: 143 [2018-11-07 05:02:12,951 INFO L226 Difference]: Without dead ends: 138 [2018-11-07 05:02:12,952 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 121 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=526, Invalid=1366, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 05:02:12,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-11-07 05:02:12,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 137. [2018-11-07 05:02:12,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2018-11-07 05:02:12,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 139 transitions. [2018-11-07 05:02:12,957 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 139 transitions. Word has length 71 [2018-11-07 05:02:12,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:02:12,958 INFO L480 AbstractCegarLoop]: Abstraction has 137 states and 139 transitions. [2018-11-07 05:02:12,958 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-07 05:02:12,958 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 139 transitions. [2018-11-07 05:02:12,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-11-07 05:02:12,959 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:02:12,959 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:02:12,959 INFO L423 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:02:12,959 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:02:12,959 INFO L82 PathProgramCache]: Analyzing trace with hash 1925556347, now seen corresponding path program 21 times [2018-11-07 05:02:12,959 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:02:12,960 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:02:12,960 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:02:12,960 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:02:12,960 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:02:12,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:02:13,401 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:02:13,401 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:02:13,401 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:02:13,401 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:02:13,402 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:02:13,402 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:02:13,402 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:02:13,411 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:02:13,411 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:02:13,437 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:02:13,437 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:02:13,439 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:02:13,452 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:02:13,452 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:02:17,268 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:02:17,287 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:02:17,287 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-11-07 05:02:17,287 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:02:17,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-07 05:02:17,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-07 05:02:17,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 05:02:17,288 INFO L87 Difference]: Start difference. First operand 137 states and 139 transitions. Second operand 24 states. [2018-11-07 05:02:18,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:02:18,179 INFO L93 Difference]: Finished difference Result 146 states and 148 transitions. [2018-11-07 05:02:18,179 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-07 05:02:18,180 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 74 [2018-11-07 05:02:18,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:02:18,181 INFO L225 Difference]: With dead ends: 146 [2018-11-07 05:02:18,181 INFO L226 Difference]: Without dead ends: 141 [2018-11-07 05:02:18,182 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 126 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 05:02:18,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2018-11-07 05:02:18,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 140. [2018-11-07 05:02:18,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2018-11-07 05:02:18,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 142 transitions. [2018-11-07 05:02:18,188 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 142 transitions. Word has length 74 [2018-11-07 05:02:18,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:02:18,188 INFO L480 AbstractCegarLoop]: Abstraction has 140 states and 142 transitions. [2018-11-07 05:02:18,188 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-07 05:02:18,188 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 142 transitions. [2018-11-07 05:02:18,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-11-07 05:02:18,188 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:02:18,189 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:02:18,189 INFO L423 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:02:18,189 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:02:18,189 INFO L82 PathProgramCache]: Analyzing trace with hash -1623734403, now seen corresponding path program 21 times [2018-11-07 05:02:18,189 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:02:18,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:02:18,190 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:02:18,190 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:02:18,190 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:02:18,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:02:18,885 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:02:18,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:02:18,885 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:02:18,885 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:02:18,885 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:02:18,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:02:18,886 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:02:18,894 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:02:18,894 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:02:18,915 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:02:18,915 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:02:18,917 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:02:18,930 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:02:18,930 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:02:22,557 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:02:22,577 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:02:22,577 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-11-07 05:02:22,577 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:02:22,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-07 05:02:22,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-07 05:02:22,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 05:02:22,578 INFO L87 Difference]: Start difference. First operand 140 states and 142 transitions. Second operand 24 states. [2018-11-07 05:02:23,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:02:23,311 INFO L93 Difference]: Finished difference Result 149 states and 151 transitions. [2018-11-07 05:02:23,311 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-07 05:02:23,311 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 74 [2018-11-07 05:02:23,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:02:23,313 INFO L225 Difference]: With dead ends: 149 [2018-11-07 05:02:23,313 INFO L226 Difference]: Without dead ends: 144 [2018-11-07 05:02:23,314 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 126 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 05:02:23,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2018-11-07 05:02:23,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 143. [2018-11-07 05:02:23,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2018-11-07 05:02:23,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2018-11-07 05:02:23,320 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 74 [2018-11-07 05:02:23,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:02:23,320 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2018-11-07 05:02:23,320 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-07 05:02:23,320 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2018-11-07 05:02:23,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-11-07 05:02:23,321 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:02:23,321 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:02:23,321 INFO L423 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:02:23,321 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:02:23,322 INFO L82 PathProgramCache]: Analyzing trace with hash -499371138, now seen corresponding path program 22 times [2018-11-07 05:02:23,322 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:02:23,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:02:23,322 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:02:23,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:02:23,323 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:02:23,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:02:24,266 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:02:24,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:02:24,267 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:02:24,267 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:02:24,267 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:02:24,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:02:24,267 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:02:24,276 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:02:24,276 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:02:24,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:02:24,305 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:02:24,351 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:02:24,351 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:02:28,409 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:02:28,428 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:02:28,428 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-11-07 05:02:28,428 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:02:28,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-07 05:02:28,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-07 05:02:28,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 05:02:28,429 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand 25 states. [2018-11-07 05:02:29,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:02:29,408 INFO L93 Difference]: Finished difference Result 152 states and 154 transitions. [2018-11-07 05:02:29,415 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-07 05:02:29,416 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 77 [2018-11-07 05:02:29,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:02:29,417 INFO L225 Difference]: With dead ends: 152 [2018-11-07 05:02:29,417 INFO L226 Difference]: Without dead ends: 147 [2018-11-07 05:02:29,417 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 131 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 05:02:29,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-11-07 05:02:29,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 146. [2018-11-07 05:02:29,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2018-11-07 05:02:29,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 148 transitions. [2018-11-07 05:02:29,423 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 148 transitions. Word has length 77 [2018-11-07 05:02:29,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:02:29,423 INFO L480 AbstractCegarLoop]: Abstraction has 146 states and 148 transitions. [2018-11-07 05:02:29,423 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-07 05:02:29,423 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 148 transitions. [2018-11-07 05:02:29,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-11-07 05:02:29,424 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:02:29,424 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:02:29,424 INFO L423 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:02:29,424 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:02:29,425 INFO L82 PathProgramCache]: Analyzing trace with hash -2140204098, now seen corresponding path program 22 times [2018-11-07 05:02:29,425 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:02:29,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:02:29,425 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:02:29,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:02:29,426 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:02:29,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:02:29,925 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:02:29,925 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:02:29,925 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:02:29,925 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:02:29,925 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:02:29,925 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:02:29,926 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:02:29,948 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:02:29,948 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:02:29,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:02:29,971 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:02:30,005 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:02:30,006 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:02:33,858 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:02:33,878 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:02:33,878 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-11-07 05:02:33,878 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:02:33,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-07 05:02:33,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-07 05:02:33,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 05:02:33,879 INFO L87 Difference]: Start difference. First operand 146 states and 148 transitions. Second operand 25 states. [2018-11-07 05:02:34,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:02:34,730 INFO L93 Difference]: Finished difference Result 155 states and 157 transitions. [2018-11-07 05:02:34,731 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-07 05:02:34,731 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 77 [2018-11-07 05:02:34,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:02:34,732 INFO L225 Difference]: With dead ends: 155 [2018-11-07 05:02:34,733 INFO L226 Difference]: Without dead ends: 150 [2018-11-07 05:02:34,733 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 131 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 05:02:34,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-11-07 05:02:34,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 149. [2018-11-07 05:02:34,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-11-07 05:02:34,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 151 transitions. [2018-11-07 05:02:34,739 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 151 transitions. Word has length 77 [2018-11-07 05:02:34,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:02:34,740 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 151 transitions. [2018-11-07 05:02:34,740 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-07 05:02:34,740 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 151 transitions. [2018-11-07 05:02:34,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-11-07 05:02:34,741 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:02:34,741 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:02:34,741 INFO L423 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:02:34,741 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:02:34,741 INFO L82 PathProgramCache]: Analyzing trace with hash -164158053, now seen corresponding path program 23 times [2018-11-07 05:02:34,741 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:02:34,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:02:34,742 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:02:34,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:02:34,742 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:02:34,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:02:35,727 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:02:35,727 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:02:35,727 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:02:35,727 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:02:35,727 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:02:35,727 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:02:35,728 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:02:35,736 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:02:35,736 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:03:00,037 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-11-07 05:03:00,037 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:03:00,083 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:03:00,140 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:03:00,141 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:03:22,649 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:03:22,669 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:03:22,670 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 27] total 51 [2018-11-07 05:03:22,670 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:03:22,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-07 05:03:22,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-07 05:03:22,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=700, Invalid=1846, Unknown=4, NotChecked=0, Total=2550 [2018-11-07 05:03:22,671 INFO L87 Difference]: Start difference. First operand 149 states and 151 transitions. Second operand 26 states. [2018-11-07 05:03:23,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:03:23,879 INFO L93 Difference]: Finished difference Result 158 states and 160 transitions. [2018-11-07 05:03:23,879 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-07 05:03:23,879 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 80 [2018-11-07 05:03:23,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:03:23,881 INFO L225 Difference]: With dead ends: 158 [2018-11-07 05:03:23,881 INFO L226 Difference]: Without dead ends: 153 [2018-11-07 05:03:23,882 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 134 SyntacticMatches, 3 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 23.4s TimeCoverageRelationStatistics Valid=700, Invalid=1846, Unknown=4, NotChecked=0, Total=2550 [2018-11-07 05:03:23,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2018-11-07 05:03:23,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 152. [2018-11-07 05:03:23,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2018-11-07 05:03:23,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 154 transitions. [2018-11-07 05:03:23,888 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 154 transitions. Word has length 80 [2018-11-07 05:03:23,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:03:23,888 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 154 transitions. [2018-11-07 05:03:23,888 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-07 05:03:23,889 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 154 transitions. [2018-11-07 05:03:23,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-11-07 05:03:23,889 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:03:23,889 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:03:23,890 INFO L423 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:03:23,890 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:03:23,890 INFO L82 PathProgramCache]: Analyzing trace with hash 578933725, now seen corresponding path program 23 times [2018-11-07 05:03:23,890 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:03:23,891 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:03:23,891 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:03:23,891 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:03:23,891 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:03:23,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:03:24,399 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:03:24,399 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:03:24,399 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:03:24,399 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:03:24,400 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:03:24,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:03:24,400 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:03:24,408 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:03:24,408 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown