java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf -i ../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 15:37:38,682 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 15:37:38,684 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 15:37:38,696 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 15:37:38,696 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 15:37:38,697 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 15:37:38,699 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 15:37:38,700 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 15:37:38,703 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 15:37:38,704 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 15:37:38,705 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 15:37:38,705 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 15:37:38,706 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 15:37:38,710 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 15:37:38,714 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 15:37:38,715 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 15:37:38,719 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 15:37:38,724 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 15:37:38,726 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 15:37:38,727 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 15:37:38,728 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 15:37:38,730 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 15:37:38,732 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-27 15:37:38,743 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf [2018-10-27 15:37:38,773 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 15:37:38,773 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 15:37:38,774 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 15:37:38,774 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 15:37:38,775 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 15:37:38,775 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 15:37:38,775 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 15:37:38,775 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 15:37:38,775 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 15:37:38,776 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 15:37:38,776 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 15:37:38,776 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 15:37:38,777 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 15:37:38,777 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 15:37:38,777 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 15:37:38,777 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 15:37:38,777 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 15:37:38,778 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 15:37:38,778 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 15:37:38,778 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 15:37:38,778 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 15:37:38,778 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 15:37:38,779 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 15:37:38,779 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 15:37:38,779 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 15:37:38,779 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 15:37:38,779 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 15:37:38,779 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 15:37:38,780 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 15:37:38,780 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 15:37:38,780 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 15:37:38,780 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 15:37:38,780 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 15:37:38,781 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 15:37:38,822 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 15:37:38,835 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 15:37:38,839 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 15:37:38,841 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 15:37:38,841 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 15:37:38,842 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call1_true-termination.i [2018-10-27 15:37:38,891 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/353cdbf22/824e9e8473b048cbbde65a76f4e84a89/FLAGefd32f276 [2018-10-27 15:37:39,301 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 15:37:39,306 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call1_true-termination.i [2018-10-27 15:37:39,314 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/353cdbf22/824e9e8473b048cbbde65a76f4e84a89/FLAGefd32f276 [2018-10-27 15:37:39,329 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/353cdbf22/824e9e8473b048cbbde65a76f4e84a89 [2018-10-27 15:37:39,341 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 15:37:39,342 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 15:37:39,343 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 15:37:39,343 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 15:37:39,346 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 15:37:39,346 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 03:37:39" (1/1) ... [2018-10-27 15:37:39,349 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@28a8effd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:37:39, skipping insertion in model container [2018-10-27 15:37:39,349 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 03:37:39" (1/1) ... [2018-10-27 15:37:39,359 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 15:37:39,381 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 15:37:39,579 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 15:37:39,584 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 15:37:39,608 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 15:37:39,627 INFO L193 MainTranslator]: Completed translation [2018-10-27 15:37:39,628 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:37:39 WrapperNode [2018-10-27 15:37:39,628 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 15:37:39,629 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 15:37:39,629 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 15:37:39,629 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 15:37:39,636 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:37:39" (1/1) ... [2018-10-27 15:37:39,644 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:37:39" (1/1) ... [2018-10-27 15:37:39,664 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 15:37:39,664 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 15:37:39,664 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 15:37:39,665 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 15:37:39,673 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:37:39" (1/1) ... [2018-10-27 15:37:39,674 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:37:39" (1/1) ... [2018-10-27 15:37:39,675 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:37:39" (1/1) ... [2018-10-27 15:37:39,676 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:37:39" (1/1) ... [2018-10-27 15:37:39,681 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:37:39" (1/1) ... [2018-10-27 15:37:39,686 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:37:39" (1/1) ... [2018-10-27 15:37:39,687 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:37:39" (1/1) ... [2018-10-27 15:37:39,689 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 15:37:39,690 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 15:37:39,690 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 15:37:39,690 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 15:37:39,691 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:37:39" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 15:37:39,824 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 15:37:39,825 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 15:37:39,825 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 15:37:39,825 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 15:37:39,825 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 15:37:39,825 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 15:37:39,825 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 15:37:39,825 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 15:37:40,222 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 15:37:40,223 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 03:37:40 BoogieIcfgContainer [2018-10-27 15:37:40,223 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 15:37:40,224 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 15:37:40,224 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 15:37:40,227 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 15:37:40,228 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 03:37:39" (1/3) ... [2018-10-27 15:37:40,229 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48cd56a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 03:37:40, skipping insertion in model container [2018-10-27 15:37:40,229 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:37:39" (2/3) ... [2018-10-27 15:37:40,229 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48cd56a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 03:37:40, skipping insertion in model container [2018-10-27 15:37:40,229 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 03:37:40" (3/3) ... [2018-10-27 15:37:40,232 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_array_index_value_true-unreach-call1_true-termination.i [2018-10-27 15:37:40,241 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 15:37:40,249 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 15:37:40,266 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 15:37:40,297 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 15:37:40,297 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 15:37:40,298 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 15:37:40,298 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 15:37:40,298 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 15:37:40,298 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 15:37:40,298 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 15:37:40,298 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 15:37:40,315 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2018-10-27 15:37:40,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-27 15:37:40,321 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:37:40,322 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:37:40,324 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:37:40,330 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:37:40,330 INFO L82 PathProgramCache]: Analyzing trace with hash 1504457121, now seen corresponding path program 1 times [2018-10-27 15:37:40,332 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:37:40,380 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:40,381 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:37:40,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:40,381 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:37:40,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:37:40,455 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:40,457 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 15:37:40,457 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 15:37:40,458 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:37:40,462 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 15:37:40,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 15:37:40,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 15:37:40,480 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 2 states. [2018-10-27 15:37:40,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:37:40,504 INFO L93 Difference]: Finished difference Result 49 states and 61 transitions. [2018-10-27 15:37:40,504 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 15:37:40,506 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-10-27 15:37:40,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:37:40,516 INFO L225 Difference]: With dead ends: 49 [2018-10-27 15:37:40,516 INFO L226 Difference]: Without dead ends: 24 [2018-10-27 15:37:40,520 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 15:37:40,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-27 15:37:40,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-27 15:37:40,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-27 15:37:40,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2018-10-27 15:37:40,565 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 15 [2018-10-27 15:37:40,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:37:40,565 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2018-10-27 15:37:40,566 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 15:37:40,566 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2018-10-27 15:37:40,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-27 15:37:40,567 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:37:40,567 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:37:40,568 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:37:40,568 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:37:40,568 INFO L82 PathProgramCache]: Analyzing trace with hash -194164888, now seen corresponding path program 1 times [2018-10-27 15:37:40,568 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:37:40,570 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:40,570 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:37:40,570 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:40,570 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:37:40,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:37:40,744 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:40,744 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 15:37:40,744 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 15:37:40,744 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:37:40,746 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 15:37:40,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 15:37:40,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 15:37:40,747 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand 3 states. [2018-10-27 15:37:40,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:37:40,939 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2018-10-27 15:37:40,939 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 15:37:40,940 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2018-10-27 15:37:40,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:37:40,941 INFO L225 Difference]: With dead ends: 48 [2018-10-27 15:37:40,941 INFO L226 Difference]: Without dead ends: 33 [2018-10-27 15:37:40,943 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 15:37:40,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-27 15:37:40,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 29. [2018-10-27 15:37:40,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-27 15:37:40,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2018-10-27 15:37:40,953 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 16 [2018-10-27 15:37:40,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:37:40,953 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2018-10-27 15:37:40,953 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 15:37:40,953 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2018-10-27 15:37:40,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-27 15:37:40,954 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:37:40,954 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:37:40,955 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:37:40,955 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:37:40,955 INFO L82 PathProgramCache]: Analyzing trace with hash 706658557, now seen corresponding path program 1 times [2018-10-27 15:37:40,955 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:37:40,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:40,957 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:37:40,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:40,957 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:37:40,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:37:41,070 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:41,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:41,071 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:37:41,077 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-10-27 15:37:41,078 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [29], [32], [46], [49], [51], [57], [58], [59], [61] [2018-10-27 15:37:41,127 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-10-27 15:37:41,127 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 15:37:41,253 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-27 15:37:41,544 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 15:37:41,545 INFO L272 AbstractInterpreter]: Visited 18 different actions 56 times. Merged at 4 different actions 30 times. Widened at 1 different actions 4 times. Found 7 fixpoints after 2 different actions. Largest state had 29 variables. [2018-10-27 15:37:41,594 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:37:41,598 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 15:37:41,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:41,598 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:37:41,617 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:37:41,617 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:37:41,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:37:41,681 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:37:41,820 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 8 [2018-10-27 15:37:41,838 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2018-10-27 15:37:41,838 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-27 15:37:41,864 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-27 15:37:41,887 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-27 15:37:41,887 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:11, output treesize:7 [2018-10-27 15:37:42,003 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2018-10-27 15:37:42,017 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2018-10-27 15:37:42,017 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-27 15:37:42,045 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-27 15:37:42,071 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-27 15:37:42,072 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:15, output treesize:3 [2018-10-27 15:37:42,269 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:42,269 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:37:42,569 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 18 [2018-10-27 15:37:42,608 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 24 [2018-10-27 15:37:42,646 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2018-10-27 15:37:42,664 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-27 15:37:42,674 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-27 15:37:42,680 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 25 [2018-10-27 15:37:42,771 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2018-10-27 15:37:42,789 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-10-27 15:37:42,812 INFO L267 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-27 15:37:42,828 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-27 15:37:42,829 INFO L202 ElimStorePlain]: Needed 5 recursive calls to eliminate 6 variables, input treesize:88, output treesize:7 [2018-10-27 15:37:42,895 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:42,916 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:37:42,916 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 8, 8] total 15 [2018-10-27 15:37:42,916 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:37:42,917 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 15:37:42,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 15:37:42,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2018-10-27 15:37:42,919 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 9 states. [2018-10-27 15:37:47,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:37:47,561 INFO L93 Difference]: Finished difference Result 87 states and 103 transitions. [2018-10-27 15:37:47,561 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 15:37:47,562 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2018-10-27 15:37:47,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:37:47,564 INFO L225 Difference]: With dead ends: 87 [2018-10-27 15:37:47,564 INFO L226 Difference]: Without dead ends: 69 [2018-10-27 15:37:47,565 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2018-10-27 15:37:47,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-27 15:37:47,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 50. [2018-10-27 15:37:47,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-27 15:37:47,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2018-10-27 15:37:47,577 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 19 [2018-10-27 15:37:47,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:37:47,578 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2018-10-27 15:37:47,578 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 15:37:47,578 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2018-10-27 15:37:47,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-27 15:37:47,579 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:37:47,579 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:37:47,580 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:37:47,580 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:37:47,580 INFO L82 PathProgramCache]: Analyzing trace with hash -1962567395, now seen corresponding path program 2 times [2018-10-27 15:37:47,580 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:37:47,581 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:47,581 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:37:47,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:47,582 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:37:47,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:37:47,809 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:47,809 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:47,809 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:37:47,810 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:37:47,810 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:37:47,810 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:47,810 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:37:47,825 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:37:47,825 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:37:47,887 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-27 15:37:47,888 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:37:47,891 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:37:47,917 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:47,917 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:37:48,078 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:48,098 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:37:48,099 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-27 15:37:48,099 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:37:48,099 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 15:37:48,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 15:37:48,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-27 15:37:48,100 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand 6 states. [2018-10-27 15:37:48,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:37:48,288 INFO L93 Difference]: Finished difference Result 93 states and 107 transitions. [2018-10-27 15:37:48,290 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-27 15:37:48,291 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 25 [2018-10-27 15:37:48,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:37:48,292 INFO L225 Difference]: With dead ends: 93 [2018-10-27 15:37:48,292 INFO L226 Difference]: Without dead ends: 60 [2018-10-27 15:37:48,293 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-27 15:37:48,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-27 15:37:48,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56. [2018-10-27 15:37:48,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-27 15:37:48,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 62 transitions. [2018-10-27 15:37:48,302 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 62 transitions. Word has length 25 [2018-10-27 15:37:48,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:37:48,303 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 62 transitions. [2018-10-27 15:37:48,303 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 15:37:48,303 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 62 transitions. [2018-10-27 15:37:48,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-27 15:37:48,305 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:37:48,306 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:37:48,306 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:37:48,306 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:37:48,306 INFO L82 PathProgramCache]: Analyzing trace with hash 296425256, now seen corresponding path program 3 times [2018-10-27 15:37:48,306 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:37:48,308 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:48,308 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:37:48,308 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:48,308 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:37:48,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:37:48,526 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:48,526 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:48,526 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:37:48,526 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:37:48,526 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:37:48,527 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:48,527 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:37:48,537 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:37:48,538 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:37:48,585 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:37:48,585 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:37:48,588 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:37:48,614 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:48,615 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:37:48,984 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:49,005 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:37:49,005 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-27 15:37:49,005 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:37:49,006 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-27 15:37:49,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-27 15:37:49,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-27 15:37:49,009 INFO L87 Difference]: Start difference. First operand 56 states and 62 transitions. Second operand 7 states. [2018-10-27 15:37:49,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:37:49,276 INFO L93 Difference]: Finished difference Result 105 states and 120 transitions. [2018-10-27 15:37:49,277 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 15:37:49,277 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 28 [2018-10-27 15:37:49,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:37:49,278 INFO L225 Difference]: With dead ends: 105 [2018-10-27 15:37:49,278 INFO L226 Difference]: Without dead ends: 69 [2018-10-27 15:37:49,279 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-27 15:37:49,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-27 15:37:49,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 65. [2018-10-27 15:37:49,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-10-27 15:37:49,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 72 transitions. [2018-10-27 15:37:49,290 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 72 transitions. Word has length 28 [2018-10-27 15:37:49,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:37:49,290 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 72 transitions. [2018-10-27 15:37:49,290 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-27 15:37:49,290 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 72 transitions. [2018-10-27 15:37:49,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-27 15:37:49,291 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:37:49,292 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:37:49,292 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:37:49,292 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:37:49,292 INFO L82 PathProgramCache]: Analyzing trace with hash 103930173, now seen corresponding path program 4 times [2018-10-27 15:37:49,292 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:37:49,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:49,294 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:37:49,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:49,294 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:37:49,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:37:49,520 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:49,520 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:49,520 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:37:49,521 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:37:49,521 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:37:49,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:49,521 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:37:49,536 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:37:49,537 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:37:49,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:37:49,570 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:37:49,611 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:49,612 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:37:52,426 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:52,447 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:37:52,447 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-27 15:37:52,447 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:37:52,447 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 15:37:52,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 15:37:52,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=120, Unknown=1, NotChecked=0, Total=182 [2018-10-27 15:37:52,448 INFO L87 Difference]: Start difference. First operand 65 states and 72 transitions. Second operand 8 states. [2018-10-27 15:37:52,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:37:52,795 INFO L93 Difference]: Finished difference Result 120 states and 137 transitions. [2018-10-27 15:37:52,797 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 15:37:52,797 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2018-10-27 15:37:52,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:37:52,798 INFO L225 Difference]: With dead ends: 120 [2018-10-27 15:37:52,799 INFO L226 Difference]: Without dead ends: 78 [2018-10-27 15:37:52,800 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=61, Invalid=120, Unknown=1, NotChecked=0, Total=182 [2018-10-27 15:37:52,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-27 15:37:52,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 74. [2018-10-27 15:37:52,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-27 15:37:52,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 82 transitions. [2018-10-27 15:37:52,810 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 82 transitions. Word has length 31 [2018-10-27 15:37:52,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:37:52,810 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 82 transitions. [2018-10-27 15:37:52,810 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 15:37:52,810 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 82 transitions. [2018-10-27 15:37:52,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-27 15:37:52,811 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:37:52,812 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:37:52,812 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:37:52,812 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:37:52,812 INFO L82 PathProgramCache]: Analyzing trace with hash -735747320, now seen corresponding path program 5 times [2018-10-27 15:37:52,812 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:37:52,813 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:52,813 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:37:52,814 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:52,814 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:37:52,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:37:53,049 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:53,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:53,050 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:37:53,050 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:37:53,050 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:37:53,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:53,051 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:37:53,060 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:37:53,060 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:37:53,391 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-27 15:37:53,391 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:37:53,395 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:37:53,494 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:53,495 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:37:56,146 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:56,166 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:37:56,166 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-27 15:37:56,167 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:37:56,167 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 15:37:56,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 15:37:56,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-27 15:37:56,168 INFO L87 Difference]: Start difference. First operand 74 states and 82 transitions. Second operand 9 states. [2018-10-27 15:37:56,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:37:56,640 INFO L93 Difference]: Finished difference Result 135 states and 154 transitions. [2018-10-27 15:37:56,640 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 15:37:56,641 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 34 [2018-10-27 15:37:56,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:37:56,642 INFO L225 Difference]: With dead ends: 135 [2018-10-27 15:37:56,642 INFO L226 Difference]: Without dead ends: 87 [2018-10-27 15:37:56,643 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-27 15:37:56,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-27 15:37:56,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 83. [2018-10-27 15:37:56,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-10-27 15:37:56,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 92 transitions. [2018-10-27 15:37:56,654 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 92 transitions. Word has length 34 [2018-10-27 15:37:56,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:37:56,655 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 92 transitions. [2018-10-27 15:37:56,655 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 15:37:56,655 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 92 transitions. [2018-10-27 15:37:56,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-27 15:37:56,656 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:37:56,656 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:37:56,657 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:37:56,657 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:37:56,657 INFO L82 PathProgramCache]: Analyzing trace with hash -1678409379, now seen corresponding path program 6 times [2018-10-27 15:37:56,657 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:37:56,658 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:56,658 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:37:56,658 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:56,659 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:37:56,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:37:56,932 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:56,933 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:56,933 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:37:56,933 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:37:56,933 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:37:56,933 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:56,934 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:37:56,945 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:37:56,945 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:37:56,988 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:37:56,988 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:37:56,991 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:37:57,047 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:57,048 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:37:59,128 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:59,147 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:37:59,148 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-27 15:37:59,148 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:37:59,148 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 15:37:59,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 15:37:59,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-27 15:37:59,149 INFO L87 Difference]: Start difference. First operand 83 states and 92 transitions. Second operand 10 states. [2018-10-27 15:37:59,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:37:59,607 INFO L93 Difference]: Finished difference Result 150 states and 171 transitions. [2018-10-27 15:37:59,607 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 15:37:59,607 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 37 [2018-10-27 15:37:59,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:37:59,608 INFO L225 Difference]: With dead ends: 150 [2018-10-27 15:37:59,608 INFO L226 Difference]: Without dead ends: 96 [2018-10-27 15:37:59,610 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-27 15:37:59,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-27 15:37:59,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 92. [2018-10-27 15:37:59,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-10-27 15:37:59,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 102 transitions. [2018-10-27 15:37:59,621 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 102 transitions. Word has length 37 [2018-10-27 15:37:59,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:37:59,622 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 102 transitions. [2018-10-27 15:37:59,622 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 15:37:59,622 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 102 transitions. [2018-10-27 15:37:59,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-27 15:37:59,623 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:37:59,623 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:37:59,624 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:37:59,624 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:37:59,624 INFO L82 PathProgramCache]: Analyzing trace with hash 267339496, now seen corresponding path program 7 times [2018-10-27 15:37:59,624 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:37:59,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:59,625 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:37:59,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:59,625 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:37:59,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:37:59,988 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:59,988 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:59,988 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:37:59,988 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:37:59,988 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:37:59,989 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:59,989 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:37:59,996 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:37:59,997 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:38:00,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:38:00,045 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:38:00,070 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:38:00,070 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:38:03,607 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:38:03,628 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:38:03,629 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-27 15:38:03,629 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:38:03,629 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 15:38:03,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 15:38:03,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=261, Unknown=1, NotChecked=0, Total=380 [2018-10-27 15:38:03,630 INFO L87 Difference]: Start difference. First operand 92 states and 102 transitions. Second operand 11 states. [2018-10-27 15:38:04,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:38:04,294 INFO L93 Difference]: Finished difference Result 165 states and 188 transitions. [2018-10-27 15:38:04,298 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 15:38:04,298 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 40 [2018-10-27 15:38:04,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:38:04,301 INFO L225 Difference]: With dead ends: 165 [2018-10-27 15:38:04,302 INFO L226 Difference]: Without dead ends: 105 [2018-10-27 15:38:04,302 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=118, Invalid=261, Unknown=1, NotChecked=0, Total=380 [2018-10-27 15:38:04,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-27 15:38:04,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 101. [2018-10-27 15:38:04,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-10-27 15:38:04,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 112 transitions. [2018-10-27 15:38:04,312 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 112 transitions. Word has length 40 [2018-10-27 15:38:04,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:38:04,313 INFO L481 AbstractCegarLoop]: Abstraction has 101 states and 112 transitions. [2018-10-27 15:38:04,313 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 15:38:04,313 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 112 transitions. [2018-10-27 15:38:04,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-27 15:38:04,314 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:38:04,314 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:38:04,314 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:38:04,315 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:38:04,315 INFO L82 PathProgramCache]: Analyzing trace with hash 1193447805, now seen corresponding path program 8 times [2018-10-27 15:38:04,315 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:38:04,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:38:04,316 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:38:04,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:38:04,316 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:38:04,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:38:05,200 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:38:05,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:38:05,201 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:38:05,201 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:38:05,201 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:38:05,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:38:05,201 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:38:05,212 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:38:05,212 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:38:05,885 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-27 15:38:05,886 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:38:05,890 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:38:05,967 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:38:05,967 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:38:09,754 WARN L179 SmtUtils]: Spent 2.02 s on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 15:38:10,602 WARN L179 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 15:38:13,106 WARN L179 SmtUtils]: Spent 1.29 s on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 15:38:13,923 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:38:13,944 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:38:13,944 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 13] total 23 [2018-10-27 15:38:13,944 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:38:13,945 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 15:38:13,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 15:38:13,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2018-10-27 15:38:13,945 INFO L87 Difference]: Start difference. First operand 101 states and 112 transitions. Second operand 12 states. [2018-10-27 15:38:14,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:38:14,550 INFO L93 Difference]: Finished difference Result 180 states and 205 transitions. [2018-10-27 15:38:14,551 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-27 15:38:14,551 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 43 [2018-10-27 15:38:14,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:38:14,552 INFO L225 Difference]: With dead ends: 180 [2018-10-27 15:38:14,553 INFO L226 Difference]: Without dead ends: 114 [2018-10-27 15:38:14,554 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 73 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2018-10-27 15:38:14,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-27 15:38:14,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 110. [2018-10-27 15:38:14,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-10-27 15:38:14,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 122 transitions. [2018-10-27 15:38:14,565 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 122 transitions. Word has length 43 [2018-10-27 15:38:14,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:38:14,565 INFO L481 AbstractCegarLoop]: Abstraction has 110 states and 122 transitions. [2018-10-27 15:38:14,565 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 15:38:14,565 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 122 transitions. [2018-10-27 15:38:14,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-27 15:38:14,567 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:38:14,567 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:38:14,567 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:38:14,567 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:38:14,567 INFO L82 PathProgramCache]: Analyzing trace with hash 16171720, now seen corresponding path program 9 times [2018-10-27 15:38:14,568 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:38:14,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:38:14,568 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:38:14,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:38:14,569 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:38:14,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:38:15,360 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:38:15,360 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:38:15,361 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:38:15,361 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:38:15,361 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:38:15,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:38:15,361 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:38:15,375 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:38:15,375 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:38:15,414 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:38:15,414 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:38:15,418 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:38:15,499 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:38:15,499 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:38:19,425 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:38:19,452 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:38:19,453 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-27 15:38:19,453 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:38:19,453 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 15:38:19,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 15:38:19,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-27 15:38:19,454 INFO L87 Difference]: Start difference. First operand 110 states and 122 transitions. Second operand 13 states. [2018-10-27 15:38:20,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:38:20,648 INFO L93 Difference]: Finished difference Result 195 states and 222 transitions. [2018-10-27 15:38:20,649 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 15:38:20,649 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 46 [2018-10-27 15:38:20,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:38:20,651 INFO L225 Difference]: With dead ends: 195 [2018-10-27 15:38:20,651 INFO L226 Difference]: Without dead ends: 123 [2018-10-27 15:38:20,652 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-27 15:38:20,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-27 15:38:20,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 119. [2018-10-27 15:38:20,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-10-27 15:38:20,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 132 transitions. [2018-10-27 15:38:20,662 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 132 transitions. Word has length 46 [2018-10-27 15:38:20,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:38:20,663 INFO L481 AbstractCegarLoop]: Abstraction has 119 states and 132 transitions. [2018-10-27 15:38:20,663 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 15:38:20,663 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 132 transitions. [2018-10-27 15:38:20,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-27 15:38:20,664 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:38:20,664 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:38:20,665 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:38:20,665 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:38:20,665 INFO L82 PathProgramCache]: Analyzing trace with hash 487262621, now seen corresponding path program 10 times [2018-10-27 15:38:20,665 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:38:20,666 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:38:20,666 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:38:20,666 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:38:20,666 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:38:20,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:38:20,882 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:38:20,882 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:38:20,882 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:38:20,882 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:38:20,882 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:38:20,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:38:20,883 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:38:20,893 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:38:20,893 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:38:20,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:38:20,935 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:38:20,971 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:38:20,971 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:38:27,179 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:38:27,200 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:38:27,200 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-27 15:38:27,200 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:38:27,200 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 15:38:27,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 15:38:27,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-27 15:38:27,201 INFO L87 Difference]: Start difference. First operand 119 states and 132 transitions. Second operand 14 states. [2018-10-27 15:38:27,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:38:27,883 INFO L93 Difference]: Finished difference Result 210 states and 239 transitions. [2018-10-27 15:38:27,885 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 15:38:27,885 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 49 [2018-10-27 15:38:27,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:38:27,886 INFO L225 Difference]: With dead ends: 210 [2018-10-27 15:38:27,886 INFO L226 Difference]: Without dead ends: 132 [2018-10-27 15:38:27,887 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 85 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-27 15:38:27,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-10-27 15:38:27,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 128. [2018-10-27 15:38:27,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-27 15:38:27,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 142 transitions. [2018-10-27 15:38:27,895 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 142 transitions. Word has length 49 [2018-10-27 15:38:27,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:38:27,895 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 142 transitions. [2018-10-27 15:38:27,895 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 15:38:27,896 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 142 transitions. [2018-10-27 15:38:27,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-27 15:38:27,897 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:38:27,897 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:38:27,897 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:38:27,897 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:38:27,897 INFO L82 PathProgramCache]: Analyzing trace with hash -1196829016, now seen corresponding path program 11 times [2018-10-27 15:38:27,897 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:38:27,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:38:27,898 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:38:27,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:38:27,899 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:38:27,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:38:28,222 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:38:28,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:38:28,223 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:38:28,223 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:38:28,223 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:38:28,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:38:28,223 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:38:28,233 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:38:28,233 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:38:33,597 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-10-27 15:38:33,597 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:38:33,605 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:38:33,625 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:38:33,625 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:38:45,880 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 219 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:38:45,900 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:38:45,901 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-27 15:38:45,901 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:38:45,901 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 15:38:45,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 15:38:45,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=531, Unknown=3, NotChecked=0, Total=756 [2018-10-27 15:38:45,902 INFO L87 Difference]: Start difference. First operand 128 states and 142 transitions. Second operand 15 states. [2018-10-27 15:38:46,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:38:46,915 INFO L93 Difference]: Finished difference Result 225 states and 256 transitions. [2018-10-27 15:38:46,915 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-27 15:38:46,916 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 52 [2018-10-27 15:38:46,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:38:46,917 INFO L225 Difference]: With dead ends: 225 [2018-10-27 15:38:46,918 INFO L226 Difference]: Without dead ends: 141 [2018-10-27 15:38:46,919 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=222, Invalid=531, Unknown=3, NotChecked=0, Total=756 [2018-10-27 15:38:46,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2018-10-27 15:38:46,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 137. [2018-10-27 15:38:46,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2018-10-27 15:38:46,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 152 transitions. [2018-10-27 15:38:46,928 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 152 transitions. Word has length 52 [2018-10-27 15:38:46,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:38:46,929 INFO L481 AbstractCegarLoop]: Abstraction has 137 states and 152 transitions. [2018-10-27 15:38:46,929 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 15:38:46,929 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 152 transitions. [2018-10-27 15:38:46,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-27 15:38:46,930 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:38:46,930 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:38:46,930 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:38:46,931 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:38:46,931 INFO L82 PathProgramCache]: Analyzing trace with hash 1837164989, now seen corresponding path program 12 times [2018-10-27 15:38:46,931 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:38:46,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:38:46,932 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:38:46,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:38:46,932 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:38:46,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:38:47,235 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:38:47,236 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:38:47,236 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:38:47,236 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:38:47,236 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:38:47,236 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:38:47,237 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:38:47,244 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:38:47,244 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:38:47,303 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:38:47,303 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:38:47,306 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:38:47,340 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:38:47,340 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:01,183 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 254 refuted. 6 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:01,203 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:01,204 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-27 15:39:01,204 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:01,204 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-27 15:39:01,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-27 15:39:01,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=615, Unknown=2, NotChecked=0, Total=870 [2018-10-27 15:39:01,205 INFO L87 Difference]: Start difference. First operand 137 states and 152 transitions. Second operand 16 states. [2018-10-27 15:39:02,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:02,182 INFO L93 Difference]: Finished difference Result 240 states and 273 transitions. [2018-10-27 15:39:02,183 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 15:39:02,183 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 55 [2018-10-27 15:39:02,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:02,185 INFO L225 Difference]: With dead ends: 240 [2018-10-27 15:39:02,185 INFO L226 Difference]: Without dead ends: 150 [2018-10-27 15:39:02,186 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 95 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=253, Invalid=615, Unknown=2, NotChecked=0, Total=870 [2018-10-27 15:39:02,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-10-27 15:39:02,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 146. [2018-10-27 15:39:02,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2018-10-27 15:39:02,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 162 transitions. [2018-10-27 15:39:02,193 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 162 transitions. Word has length 55 [2018-10-27 15:39:02,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:02,194 INFO L481 AbstractCegarLoop]: Abstraction has 146 states and 162 transitions. [2018-10-27 15:39:02,194 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-27 15:39:02,194 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 162 transitions. [2018-10-27 15:39:02,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-10-27 15:39:02,195 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:02,195 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:02,195 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:02,196 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:02,196 INFO L82 PathProgramCache]: Analyzing trace with hash -34176376, now seen corresponding path program 13 times [2018-10-27 15:39:02,196 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:02,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:02,197 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:39:02,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:02,197 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:02,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:02,938 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:02,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:02,939 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:02,939 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:02,939 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:02,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:02,939 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:02,946 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:02,947 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:39:02,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:02,996 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:03,046 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:03,047 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:22,003 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 298 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:22,023 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:22,023 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-27 15:39:22,024 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:22,024 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 15:39:22,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 15:39:22,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=703, Unknown=3, NotChecked=0, Total=992 [2018-10-27 15:39:22,025 INFO L87 Difference]: Start difference. First operand 146 states and 162 transitions. Second operand 17 states. [2018-10-27 15:39:23,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:23,450 INFO L93 Difference]: Finished difference Result 255 states and 290 transitions. [2018-10-27 15:39:23,450 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 15:39:23,450 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 58 [2018-10-27 15:39:23,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:23,452 INFO L225 Difference]: With dead ends: 255 [2018-10-27 15:39:23,453 INFO L226 Difference]: Without dead ends: 159 [2018-10-27 15:39:23,454 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 100 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 19.6s TimeCoverageRelationStatistics Valid=286, Invalid=703, Unknown=3, NotChecked=0, Total=992 [2018-10-27 15:39:23,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2018-10-27 15:39:23,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 155. [2018-10-27 15:39:23,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 155 states. [2018-10-27 15:39:23,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 172 transitions. [2018-10-27 15:39:23,463 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 172 transitions. Word has length 58 [2018-10-27 15:39:23,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:23,463 INFO L481 AbstractCegarLoop]: Abstraction has 155 states and 172 transitions. [2018-10-27 15:39:23,463 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 15:39:23,463 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 172 transitions. [2018-10-27 15:39:23,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-27 15:39:23,464 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:23,464 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:23,464 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:23,465 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:23,465 INFO L82 PathProgramCache]: Analyzing trace with hash -489279011, now seen corresponding path program 14 times [2018-10-27 15:39:23,465 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:23,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:23,465 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:39:23,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:23,466 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:23,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:24,220 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:24,220 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:24,220 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:24,220 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:24,220 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:24,220 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:24,221 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:24,228 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:39:24,228 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:39:38,553 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-27 15:39:38,553 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:39:38,565 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:38,662 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:38,662 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:39:38,974 WARN L179 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 15:39:40,654 WARN L179 SmtUtils]: Spent 1.57 s on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 15:39:44,436 WARN L179 SmtUtils]: Spent 1.60 s on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 15:39:45,489 WARN L179 SmtUtils]: Spent 633.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 15:39:46,576 WARN L179 SmtUtils]: Spent 409.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 15:39:49,325 WARN L179 SmtUtils]: Spent 2.02 s on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 15:39:50,017 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:50,038 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:39:50,038 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 19] total 35 [2018-10-27 15:39:50,038 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:39:50,038 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 15:39:50,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 15:39:50,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2018-10-27 15:39:50,039 INFO L87 Difference]: Start difference. First operand 155 states and 172 transitions. Second operand 18 states. [2018-10-27 15:39:51,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:39:51,342 INFO L93 Difference]: Finished difference Result 270 states and 307 transitions. [2018-10-27 15:39:51,343 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-27 15:39:51,343 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 61 [2018-10-27 15:39:51,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:39:51,344 INFO L225 Difference]: With dead ends: 270 [2018-10-27 15:39:51,344 INFO L226 Difference]: Without dead ends: 168 [2018-10-27 15:39:51,345 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 103 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2018-10-27 15:39:51,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2018-10-27 15:39:51,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 164. [2018-10-27 15:39:51,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2018-10-27 15:39:51,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 182 transitions. [2018-10-27 15:39:51,353 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 182 transitions. Word has length 61 [2018-10-27 15:39:51,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:39:51,354 INFO L481 AbstractCegarLoop]: Abstraction has 164 states and 182 transitions. [2018-10-27 15:39:51,354 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 15:39:51,354 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 182 transitions. [2018-10-27 15:39:51,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-27 15:39:51,354 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:39:51,355 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:39:51,355 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:39:51,355 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:39:51,355 INFO L82 PathProgramCache]: Analyzing trace with hash 759875176, now seen corresponding path program 15 times [2018-10-27 15:39:51,355 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:39:51,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:51,356 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:39:51,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:39:51,356 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:39:51,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:39:51,889 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:51,890 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:51,890 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:39:51,890 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:39:51,890 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:39:51,890 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:39:51,890 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:39:51,900 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:39:51,900 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:39:51,955 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:39:51,955 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:39:51,958 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:39:51,979 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:39:51,979 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:40:11,880 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 389 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:40:11,900 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:40:11,900 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-27 15:40:11,900 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:40:11,901 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 15:40:11,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 15:40:11,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=899, Unknown=3, NotChecked=0, Total=1260 [2018-10-27 15:40:11,902 INFO L87 Difference]: Start difference. First operand 164 states and 182 transitions. Second operand 19 states. [2018-10-27 15:40:13,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:40:13,333 INFO L93 Difference]: Finished difference Result 285 states and 324 transitions. [2018-10-27 15:40:13,336 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 15:40:13,336 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 64 [2018-10-27 15:40:13,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:40:13,337 INFO L225 Difference]: With dead ends: 285 [2018-10-27 15:40:13,337 INFO L226 Difference]: Without dead ends: 177 [2018-10-27 15:40:13,338 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 110 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 20.3s TimeCoverageRelationStatistics Valid=358, Invalid=899, Unknown=3, NotChecked=0, Total=1260 [2018-10-27 15:40:13,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-10-27 15:40:13,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 173. [2018-10-27 15:40:13,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2018-10-27 15:40:13,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 192 transitions. [2018-10-27 15:40:13,347 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 192 transitions. Word has length 64 [2018-10-27 15:40:13,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:40:13,347 INFO L481 AbstractCegarLoop]: Abstraction has 173 states and 192 transitions. [2018-10-27 15:40:13,347 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 15:40:13,347 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 192 transitions. [2018-10-27 15:40:13,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-27 15:40:13,348 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:40:13,348 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:40:13,349 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:40:13,349 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:40:13,349 INFO L82 PathProgramCache]: Analyzing trace with hash -1579359747, now seen corresponding path program 16 times [2018-10-27 15:40:13,349 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:40:13,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:40:13,350 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:40:13,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:40:13,350 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:40:13,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:40:14,048 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:40:14,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:40:14,049 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:40:14,049 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:40:14,049 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:40:14,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:40:14,049 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:40:14,059 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:40:14,059 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:40:14,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:40:14,115 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:40:14,157 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:40:14,158 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:40:32,427 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 439 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:40:32,448 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:40:32,448 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-27 15:40:32,448 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:40:32,448 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 15:40:32,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 15:40:32,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1005, Unknown=4, NotChecked=0, Total=1406 [2018-10-27 15:40:32,449 INFO L87 Difference]: Start difference. First operand 173 states and 192 transitions. Second operand 20 states. [2018-10-27 15:40:34,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:40:34,060 INFO L93 Difference]: Finished difference Result 300 states and 341 transitions. [2018-10-27 15:40:34,061 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 15:40:34,061 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2018-10-27 15:40:34,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:40:34,063 INFO L225 Difference]: With dead ends: 300 [2018-10-27 15:40:34,063 INFO L226 Difference]: Without dead ends: 186 [2018-10-27 15:40:34,064 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 115 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=397, Invalid=1005, Unknown=4, NotChecked=0, Total=1406 [2018-10-27 15:40:34,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-10-27 15:40:34,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 182. [2018-10-27 15:40:34,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2018-10-27 15:40:34,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 202 transitions. [2018-10-27 15:40:34,071 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 202 transitions. Word has length 67 [2018-10-27 15:40:34,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:40:34,072 INFO L481 AbstractCegarLoop]: Abstraction has 182 states and 202 transitions. [2018-10-27 15:40:34,072 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 15:40:34,072 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 202 transitions. [2018-10-27 15:40:34,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-10-27 15:40:34,073 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:40:34,073 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:40:34,073 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:40:34,073 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:40:34,073 INFO L82 PathProgramCache]: Analyzing trace with hash 412394056, now seen corresponding path program 17 times [2018-10-27 15:40:34,073 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:40:34,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:40:34,074 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:40:34,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:40:34,074 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:40:34,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:40:34,484 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:40:34,485 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:40:34,485 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:40:34,485 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:40:34,485 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:40:34,485 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:40:34,485 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:40:34,494 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:40:34,494 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:41:16,343 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-10-27 15:41:16,343 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:16,361 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:16,395 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:16,395 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:18,646 WARN L179 SmtUtils]: Spent 348.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 15:41:20,025 WARN L179 SmtUtils]: Spent 314.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 15:41:20,301 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 15:41:29,912 WARN L179 SmtUtils]: Spent 2.02 s on a formula simplification that was a NOOP. DAG size: 12 [2018-10-27 15:41:29,934 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:29,956 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:29,956 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 22] total 41 [2018-10-27 15:41:29,956 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:29,956 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 15:41:29,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 15:41:29,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2018-10-27 15:41:29,958 INFO L87 Difference]: Start difference. First operand 182 states and 202 transitions. Second operand 21 states. [2018-10-27 15:41:31,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:31,526 INFO L93 Difference]: Finished difference Result 315 states and 358 transitions. [2018-10-27 15:41:31,526 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-27 15:41:31,526 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 70 [2018-10-27 15:41:31,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:31,528 INFO L225 Difference]: With dead ends: 315 [2018-10-27 15:41:31,529 INFO L226 Difference]: Without dead ends: 195 [2018-10-27 15:41:31,530 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 118 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2018-10-27 15:41:31,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2018-10-27 15:41:31,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 191. [2018-10-27 15:41:31,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 191 states. [2018-10-27 15:41:31,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 212 transitions. [2018-10-27 15:41:31,539 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 212 transitions. Word has length 70 [2018-10-27 15:41:31,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:31,539 INFO L481 AbstractCegarLoop]: Abstraction has 191 states and 212 transitions. [2018-10-27 15:41:31,539 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 15:41:31,539 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 212 transitions. [2018-10-27 15:41:31,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-10-27 15:41:31,540 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:31,540 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:31,540 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:31,540 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:31,540 INFO L82 PathProgramCache]: Analyzing trace with hash 1776744989, now seen corresponding path program 18 times [2018-10-27 15:41:31,541 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:31,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:31,541 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:31,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:31,542 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:31,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:32,938 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:32,938 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:32,938 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:32,938 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:32,939 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:32,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:32,939 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:32,946 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:41:32,946 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:41:33,001 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:41:33,002 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:33,005 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:33,045 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:33,045 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:59,011 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 548 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:59,032 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:59,032 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-27 15:41:59,033 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:59,033 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 15:41:59,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 15:41:59,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1236, Unknown=5, NotChecked=0, Total=1722 [2018-10-27 15:41:59,034 INFO L87 Difference]: Start difference. First operand 191 states and 212 transitions. Second operand 22 states. [2018-10-27 15:42:01,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:01,596 INFO L93 Difference]: Finished difference Result 330 states and 375 transitions. [2018-10-27 15:42:01,597 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 15:42:01,597 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 73 [2018-10-27 15:42:01,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:01,599 INFO L225 Difference]: With dead ends: 330 [2018-10-27 15:42:01,599 INFO L226 Difference]: Without dead ends: 204 [2018-10-27 15:42:01,601 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 125 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.2s TimeCoverageRelationStatistics Valid=481, Invalid=1236, Unknown=5, NotChecked=0, Total=1722 [2018-10-27 15:42:01,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2018-10-27 15:42:01,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 200. [2018-10-27 15:42:01,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2018-10-27 15:42:01,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 222 transitions. [2018-10-27 15:42:01,610 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 222 transitions. Word has length 73 [2018-10-27 15:42:01,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:01,610 INFO L481 AbstractCegarLoop]: Abstraction has 200 states and 222 transitions. [2018-10-27 15:42:01,610 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 15:42:01,610 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 222 transitions. [2018-10-27 15:42:01,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-27 15:42:01,611 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:01,611 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:01,612 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:01,612 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:01,612 INFO L82 PathProgramCache]: Analyzing trace with hash -415099352, now seen corresponding path program 19 times [2018-10-27 15:42:01,612 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:01,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:01,613 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:01,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:01,613 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:01,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:03,001 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:03,002 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:03,002 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:03,002 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:03,002 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:03,002 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:03,002 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:42:03,010 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:03,011 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:42:03,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:03,073 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:03,100 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:03,101 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-10-27 15:42:14,458 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-27 15:42:14,659 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:42:14,659 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-27 15:42:14,666 WARN L205 ceAbstractionStarter]: Timeout [2018-10-27 15:42:14,667 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 03:42:14 BoogieIcfgContainer [2018-10-27 15:42:14,667 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-27 15:42:14,668 INFO L168 Benchmark]: Toolchain (without parser) took 275326.44 ms. Allocated memory was 1.5 GB in the beginning and 2.5 GB in the end (delta: 961.0 MB). Free memory was 1.4 GB in the beginning and 1.7 GB in the end (delta: -260.8 MB). Peak memory consumption was 700.2 MB. Max. memory is 7.1 GB. [2018-10-27 15:42:14,669 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 15:42:14,669 INFO L168 Benchmark]: CACSL2BoogieTranslator took 285.60 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-27 15:42:14,670 INFO L168 Benchmark]: Boogie Procedure Inliner took 35.36 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 15:42:14,671 INFO L168 Benchmark]: Boogie Preprocessor took 25.01 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 15:42:14,672 INFO L168 Benchmark]: RCFGBuilder took 533.47 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 725.6 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -777.3 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. [2018-10-27 15:42:14,672 INFO L168 Benchmark]: TraceAbstraction took 274442.93 ms. Allocated memory was 2.2 GB in the beginning and 2.5 GB in the end (delta: 235.4 MB). Free memory was 2.2 GB in the beginning and 1.7 GB in the end (delta: 505.9 MB). Peak memory consumption was 741.3 MB. Max. memory is 7.1 GB. [2018-10-27 15:42:14,676 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 285.60 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 35.36 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 25.01 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 533.47 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 725.6 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -777.3 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 274442.93 ms. Allocated memory was 2.2 GB in the beginning and 2.5 GB in the end (delta: 235.4 MB). Free memory was 2.2 GB in the beginning and 1.7 GB in the end (delta: 505.9 MB). Peak memory consumption was 741.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 11]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 11). Cancelled while BasicCegarLoop was analyzing trace of length 77 with TraceHistMax 21,while TraceCheckSpWp was constructing backward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 35 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 29 locations, 1 error locations. TIMEOUT Result, 274.3s OverallTime, 21 OverallIterations, 21 TraceHistogramMax, 21.7s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 1356 SDtfs, 873 SDslu, 13427 SDs, 0 SdLazy, 17672 SolverSat, 240 SolverUnsat, 2 SolverUnknown, 0 SolverNotchecked, 18.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1936 GetRequests, 1470 SyntacticMatches, 38 SemanticMatches, 428 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 172.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=200occurred in iteration=20, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.5s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 20 MinimizatonAttempts, 91 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 63.4s SatisfiabilityAnalysisTime, 174.2s InterpolantComputationTime, 1735 NumberOfCodeBlocks, 1735 NumberOfCodeBlocksAsserted, 107 NumberOfCheckSat, 2531 ConstructedInterpolants, 0 QuantifiedInterpolants, 749257 SizeOfPredicates, 40 NumberOfNonLiveVariables, 3910 ConjunctsInSsa, 470 ConjunctsInUnsatCore, 56 InterpolantComputations, 2 PerfectInterpolantSequences, 0/11379 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown