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/automizer/svcomp-Reach-64bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/functions_true-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 11:54:00,985 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 11:54:00,988 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 11:54:01,000 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 11:54:01,000 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 11:54:01,001 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 11:54:01,003 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 11:54:01,005 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 11:54:01,006 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 11:54:01,007 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 11:54:01,008 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 11:54:01,009 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 11:54:01,010 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 11:54:01,011 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 11:54:01,012 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 11:54:01,013 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 11:54:01,014 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 11:54:01,016 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 11:54:01,020 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 11:54:01,024 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 11:54:01,025 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 11:54:01,027 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 11:54:01,035 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-24 11:54:01,054 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-64bit-Automizer_Default.epf [2018-10-24 11:54:01,084 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 11:54:01,084 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 11:54:01,085 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 11:54:01,085 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-24 11:54:01,086 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-24 11:54:01,086 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-24 11:54:01,086 INFO L133 SettingsManager]: * Use SBE=true [2018-10-24 11:54:01,086 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 11:54:01,087 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 11:54:01,087 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 11:54:01,087 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 11:54:01,087 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 11:54:01,087 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 11:54:01,087 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 11:54:01,088 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 11:54:01,088 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 11:54:01,088 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 11:54:01,088 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 11:54:01,088 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 11:54:01,089 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 11:54:01,089 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 11:54:01,089 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 11:54:01,089 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 11:54:01,089 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-24 11:54:01,090 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 11:54:01,090 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 11:54:01,090 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 11:54:01,090 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 11:54:01,140 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 11:54:01,156 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 11:54:01,159 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 11:54:01,161 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 11:54:01,161 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 11:54:01,162 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/functions_true-unreach-call1_true-termination.i [2018-10-24 11:54:01,232 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/fa89f85d6/faec76666d564f4f8accbf77f4f2fb64/FLAG54bb1d74f [2018-10-24 11:54:01,704 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 11:54:01,705 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/functions_true-unreach-call1_true-termination.i [2018-10-24 11:54:01,710 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/fa89f85d6/faec76666d564f4f8accbf77f4f2fb64/FLAG54bb1d74f [2018-10-24 11:54:01,727 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/fa89f85d6/faec76666d564f4f8accbf77f4f2fb64 [2018-10-24 11:54:01,738 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 11:54:01,740 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 11:54:01,741 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 11:54:01,741 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 11:54:01,745 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 11:54:01,746 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:54:01" (1/1) ... [2018-10-24 11:54:01,750 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55e6f8a3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:01, skipping insertion in model container [2018-10-24 11:54:01,750 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:54:01" (1/1) ... [2018-10-24 11:54:01,761 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 11:54:01,780 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 11:54:01,966 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 11:54:01,970 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 11:54:01,988 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 11:54:02,006 INFO L193 MainTranslator]: Completed translation [2018-10-24 11:54:02,006 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:02 WrapperNode [2018-10-24 11:54:02,006 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 11:54:02,007 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 11:54:02,007 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 11:54:02,008 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 11:54:02,018 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:02" (1/1) ... [2018-10-24 11:54:02,025 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:02" (1/1) ... [2018-10-24 11:54:02,046 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 11:54:02,047 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 11:54:02,047 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 11:54:02,047 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 11:54:02,059 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:02" (1/1) ... [2018-10-24 11:54:02,059 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:02" (1/1) ... [2018-10-24 11:54:02,060 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:02" (1/1) ... [2018-10-24 11:54:02,060 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:02" (1/1) ... [2018-10-24 11:54:02,062 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:02" (1/1) ... [2018-10-24 11:54:02,070 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:02" (1/1) ... [2018-10-24 11:54:02,073 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:02" (1/1) ... [2018-10-24 11:54:02,074 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 11:54:02,075 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 11:54:02,075 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 11:54:02,075 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 11:54:02,081 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:02" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 11:54:02,283 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 11:54:02,284 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 11:54:02,478 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 11:54:02,478 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:54:02 BoogieIcfgContainer [2018-10-24 11:54:02,479 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 11:54:02,480 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 11:54:02,480 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 11:54:02,483 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 11:54:02,483 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 11:54:01" (1/3) ... [2018-10-24 11:54:02,484 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b140b7b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:54:02, skipping insertion in model container [2018-10-24 11:54:02,484 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:02" (2/3) ... [2018-10-24 11:54:02,485 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b140b7b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:54:02, skipping insertion in model container [2018-10-24 11:54:02,485 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:54:02" (3/3) ... [2018-10-24 11:54:02,487 INFO L112 eAbstractionObserver]: Analyzing ICFG functions_true-unreach-call1_true-termination.i [2018-10-24 11:54:02,497 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 11:54:02,505 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 11:54:02,526 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 11:54:02,557 INFO L135 ementStrategyFactory]: Using default assertion order modulation [2018-10-24 11:54:02,558 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 11:54:02,558 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 11:54:02,558 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 11:54:02,558 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 11:54:02,558 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 11:54:02,558 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 11:54:02,559 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 11:54:02,559 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 11:54:02,573 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states. [2018-10-24 11:54:02,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-24 11:54:02,580 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:02,581 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-10-24 11:54:02,584 INFO L424 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:02,590 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:02,590 INFO L82 PathProgramCache]: Analyzing trace with hash 889845351, now seen corresponding path program 1 times [2018-10-24 11:54:02,592 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:02,593 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:02,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:02,648 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:02,648 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:02,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:02,720 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:02,723 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 11:54:02,723 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 11:54:02,729 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 11:54:02,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 11:54:02,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 11:54:02,749 INFO L87 Difference]: Start difference. First operand 13 states. Second operand 2 states. [2018-10-24 11:54:02,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:02,776 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2018-10-24 11:54:02,777 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 11:54:02,778 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 6 [2018-10-24 11:54:02,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:02,790 INFO L225 Difference]: With dead ends: 21 [2018-10-24 11:54:02,790 INFO L226 Difference]: Without dead ends: 9 [2018-10-24 11:54:02,794 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 11:54:02,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-10-24 11:54:02,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-10-24 11:54:02,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-10-24 11:54:02,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-10-24 11:54:02,835 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-10-24 11:54:02,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:02,835 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-10-24 11:54:02,835 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 11:54:02,836 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-10-24 11:54:02,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-10-24 11:54:02,836 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:02,836 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:02,837 INFO L424 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:02,837 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:02,837 INFO L82 PathProgramCache]: Analyzing trace with hash 1805925645, now seen corresponding path program 1 times [2018-10-24 11:54:02,838 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:02,838 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:02,839 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:02,839 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:02,839 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:02,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:02,991 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:02,992 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 11:54:02,992 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 11:54:02,994 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 11:54:02,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 11:54:02,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 11:54:02,995 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 3 states. [2018-10-24 11:54:03,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:03,077 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-10-24 11:54:03,078 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 11:54:03,078 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 7 [2018-10-24 11:54:03,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:03,079 INFO L225 Difference]: With dead ends: 16 [2018-10-24 11:54:03,079 INFO L226 Difference]: Without dead ends: 12 [2018-10-24 11:54:03,082 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 11:54:03,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-24 11:54:03,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2018-10-24 11:54:03,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-10-24 11:54:03,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-10-24 11:54:03,089 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 7 [2018-10-24 11:54:03,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:03,089 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-10-24 11:54:03,090 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 11:54:03,090 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-10-24 11:54:03,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-24 11:54:03,090 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:03,091 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:03,092 INFO L424 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:03,092 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:03,093 INFO L82 PathProgramCache]: Analyzing trace with hash -1078158165, now seen corresponding path program 1 times [2018-10-24 11:54:03,093 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:03,093 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:03,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:03,094 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:03,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:03,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:03,290 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:03,291 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:03,291 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:03,301 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:03,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:03,331 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:03,389 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:03,424 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:03,424 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-24 11:54:03,425 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 11:54:03,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 11:54:03,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 11:54:03,429 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 5 states. [2018-10-24 11:54:03,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:03,562 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-24 11:54:03,563 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 11:54:03,563 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2018-10-24 11:54:03,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:03,564 INFO L225 Difference]: With dead ends: 19 [2018-10-24 11:54:03,564 INFO L226 Difference]: Without dead ends: 15 [2018-10-24 11:54:03,565 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-10-24 11:54:03,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-24 11:54:03,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2018-10-24 11:54:03,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-24 11:54:03,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-24 11:54:03,569 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 10 [2018-10-24 11:54:03,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:03,569 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-24 11:54:03,570 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 11:54:03,570 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-24 11:54:03,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 11:54:03,570 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:03,571 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:03,571 INFO L424 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:03,571 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:03,571 INFO L82 PathProgramCache]: Analyzing trace with hash 1814605, now seen corresponding path program 2 times [2018-10-24 11:54:03,571 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:03,572 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:03,573 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:03,573 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:03,573 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:03,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:04,006 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:04,007 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:04,007 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:04,023 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:54:04,054 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:54:04,054 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:04,056 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:04,073 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:04,094 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:04,094 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-24 11:54:04,095 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 11:54:04,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 11:54:04,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-24 11:54:04,095 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 7 states. [2018-10-24 11:54:04,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:04,360 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-10-24 11:54:04,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 11:54:04,361 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-10-24 11:54:04,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:04,362 INFO L225 Difference]: With dead ends: 22 [2018-10-24 11:54:04,362 INFO L226 Difference]: Without dead ends: 18 [2018-10-24 11:54:04,363 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2018-10-24 11:54:04,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-24 11:54:04,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2018-10-24 11:54:04,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-24 11:54:04,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-24 11:54:04,370 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 13 [2018-10-24 11:54:04,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:04,372 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-24 11:54:04,372 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 11:54:04,372 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-24 11:54:04,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-24 11:54:04,373 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:04,373 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:04,373 INFO L424 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:04,374 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:04,374 INFO L82 PathProgramCache]: Analyzing trace with hash -129408661, now seen corresponding path program 3 times [2018-10-24 11:54:04,374 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:04,375 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:04,376 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:04,376 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:04,376 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:04,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:04,668 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:04,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:04,668 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:04,677 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:54:04,691 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 11:54:04,691 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:04,693 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:04,732 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:04,754 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:04,754 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-24 11:54:04,754 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 11:54:04,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 11:54:04,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-24 11:54:04,755 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2018-10-24 11:54:05,044 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-10-24 11:54:05,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:05,273 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-24 11:54:05,273 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 11:54:05,274 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2018-10-24 11:54:05,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:05,274 INFO L225 Difference]: With dead ends: 25 [2018-10-24 11:54:05,275 INFO L226 Difference]: Without dead ends: 21 [2018-10-24 11:54:05,275 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2018-10-24 11:54:05,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-24 11:54:05,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2018-10-24 11:54:05,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-24 11:54:05,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-24 11:54:05,280 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2018-10-24 11:54:05,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:05,280 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-24 11:54:05,280 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 11:54:05,280 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-24 11:54:05,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-24 11:54:05,281 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:05,281 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:05,281 INFO L424 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:05,282 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:05,282 INFO L82 PathProgramCache]: Analyzing trace with hash -981486707, now seen corresponding path program 4 times [2018-10-24 11:54:05,282 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:05,282 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:05,283 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:05,284 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:05,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:05,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:05,590 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:05,591 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:05,591 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:05,606 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:54:05,624 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:54:05,624 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:05,630 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:05,653 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:05,680 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:05,681 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-10-24 11:54:05,681 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 11:54:05,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 11:54:05,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-24 11:54:05,682 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 11 states. [2018-10-24 11:54:06,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:06,073 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-10-24 11:54:06,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 11:54:06,077 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 19 [2018-10-24 11:54:06,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:06,078 INFO L225 Difference]: With dead ends: 28 [2018-10-24 11:54:06,078 INFO L226 Difference]: Without dead ends: 24 [2018-10-24 11:54:06,079 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2018-10-24 11:54:06,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-24 11:54:06,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2018-10-24 11:54:06,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-24 11:54:06,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-10-24 11:54:06,084 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2018-10-24 11:54:06,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:06,084 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-10-24 11:54:06,084 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 11:54:06,084 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-10-24 11:54:06,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-24 11:54:06,085 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:06,085 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:06,086 INFO L424 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:06,086 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:06,086 INFO L82 PathProgramCache]: Analyzing trace with hash -1981835733, now seen corresponding path program 5 times [2018-10-24 11:54:06,086 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:06,087 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:06,088 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:06,088 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:06,088 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:06,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:06,384 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:06,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:06,385 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:06,393 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-24 11:54:06,420 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-24 11:54:06,420 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:06,424 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:06,497 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:06,530 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:06,531 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-24 11:54:06,531 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 11:54:06,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 11:54:06,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-24 11:54:06,532 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 13 states. [2018-10-24 11:54:06,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:06,903 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-10-24 11:54:06,905 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 11:54:06,905 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 22 [2018-10-24 11:54:06,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:06,906 INFO L225 Difference]: With dead ends: 31 [2018-10-24 11:54:06,907 INFO L226 Difference]: Without dead ends: 27 [2018-10-24 11:54:06,907 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2018-10-24 11:54:06,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-24 11:54:06,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-24 11:54:06,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-24 11:54:06,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-24 11:54:06,912 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2018-10-24 11:54:06,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:06,913 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-24 11:54:06,913 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 11:54:06,913 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-24 11:54:06,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 11:54:06,914 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:06,914 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:06,914 INFO L424 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:06,914 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:06,915 INFO L82 PathProgramCache]: Analyzing trace with hash -601602355, now seen corresponding path program 6 times [2018-10-24 11:54:06,915 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:06,915 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:06,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:06,916 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:06,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:06,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:07,464 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:07,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:07,465 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:07,473 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-24 11:54:07,515 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-24 11:54:07,515 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:07,518 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:07,543 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:07,564 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:07,564 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-24 11:54:07,565 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 11:54:07,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 11:54:07,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-24 11:54:07,566 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 15 states. [2018-10-24 11:54:08,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:08,076 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-10-24 11:54:08,076 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 11:54:08,076 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 25 [2018-10-24 11:54:08,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:08,077 INFO L225 Difference]: With dead ends: 34 [2018-10-24 11:54:08,077 INFO L226 Difference]: Without dead ends: 30 [2018-10-24 11:54:08,078 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2018-10-24 11:54:08,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-24 11:54:08,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-10-24 11:54:08,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-24 11:54:08,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-10-24 11:54:08,084 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2018-10-24 11:54:08,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:08,084 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-10-24 11:54:08,085 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 11:54:08,085 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-10-24 11:54:08,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-24 11:54:08,086 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:08,086 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:08,086 INFO L424 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:08,086 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:08,086 INFO L82 PathProgramCache]: Analyzing trace with hash -2085930261, now seen corresponding path program 7 times [2018-10-24 11:54:08,086 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:08,087 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:08,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:08,088 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:08,088 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:08,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:08,428 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:08,429 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:08,429 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:08,437 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:08,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:08,456 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:08,496 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:08,519 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:08,520 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-24 11:54:08,520 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 11:54:08,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 11:54:08,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-24 11:54:08,521 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 17 states. [2018-10-24 11:54:09,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:09,220 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-10-24 11:54:09,220 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 11:54:09,221 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 28 [2018-10-24 11:54:09,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:09,222 INFO L225 Difference]: With dead ends: 37 [2018-10-24 11:54:09,222 INFO L226 Difference]: Without dead ends: 33 [2018-10-24 11:54:09,223 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2018-10-24 11:54:09,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-24 11:54:09,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-10-24 11:54:09,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-24 11:54:09,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-24 11:54:09,228 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2018-10-24 11:54:09,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:09,229 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-24 11:54:09,229 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 11:54:09,229 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-24 11:54:09,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-24 11:54:09,230 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:09,230 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:09,231 INFO L424 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:09,231 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:09,231 INFO L82 PathProgramCache]: Analyzing trace with hash -715298291, now seen corresponding path program 8 times [2018-10-24 11:54:09,231 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:09,231 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:09,232 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:09,232 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:09,233 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:09,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:09,611 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:09,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:09,612 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:09,632 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:54:09,665 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:54:09,665 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:09,669 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:09,721 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:09,742 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:09,742 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-10-24 11:54:09,743 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 11:54:09,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 11:54:09,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-24 11:54:09,744 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 19 states. [2018-10-24 11:54:10,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:10,452 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-10-24 11:54:10,453 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 11:54:10,453 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 31 [2018-10-24 11:54:10,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:10,454 INFO L225 Difference]: With dead ends: 40 [2018-10-24 11:54:10,455 INFO L226 Difference]: Without dead ends: 36 [2018-10-24 11:54:10,456 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 11:54:10,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-24 11:54:10,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2018-10-24 11:54:10,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-24 11:54:10,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-10-24 11:54:10,463 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2018-10-24 11:54:10,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:10,463 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-10-24 11:54:10,463 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 11:54:10,463 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-10-24 11:54:10,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-24 11:54:10,464 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:10,464 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:10,465 INFO L424 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:10,465 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:10,465 INFO L82 PathProgramCache]: Analyzing trace with hash -472363093, now seen corresponding path program 9 times [2018-10-24 11:54:10,465 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:10,465 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:10,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:10,466 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:10,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:10,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:10,890 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:10,891 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:10,891 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:10,898 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:54:14,908 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 11:54:14,908 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:14,915 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:14,950 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:14,980 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:14,980 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 21 [2018-10-24 11:54:14,980 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 11:54:14,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 11:54:14,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-10-24 11:54:14,981 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 21 states. [2018-10-24 11:54:15,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:15,928 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-10-24 11:54:15,929 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 11:54:15,929 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 34 [2018-10-24 11:54:15,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:15,930 INFO L225 Difference]: With dead ends: 43 [2018-10-24 11:54:15,931 INFO L226 Difference]: Without dead ends: 39 [2018-10-24 11:54:15,932 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 11:54:15,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-24 11:54:15,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-10-24 11:54:15,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-24 11:54:15,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-24 11:54:15,938 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2018-10-24 11:54:15,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:15,938 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-24 11:54:15,938 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 11:54:15,938 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-24 11:54:15,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-24 11:54:15,939 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:15,939 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:15,939 INFO L424 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:15,940 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:15,940 INFO L82 PathProgramCache]: Analyzing trace with hash -209773235, now seen corresponding path program 10 times [2018-10-24 11:54:15,940 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:15,940 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:15,941 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:15,941 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:15,941 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:15,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:16,366 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:16,366 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:16,367 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:16,375 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:54:16,419 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:54:16,419 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:16,423 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:16,498 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:16,534 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:16,535 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 23 [2018-10-24 11:54:16,535 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 11:54:16,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 11:54:16,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-10-24 11:54:16,536 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 23 states. [2018-10-24 11:54:17,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:17,484 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-10-24 11:54:17,484 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 11:54:17,485 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 37 [2018-10-24 11:54:17,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:17,486 INFO L225 Difference]: With dead ends: 46 [2018-10-24 11:54:17,486 INFO L226 Difference]: Without dead ends: 42 [2018-10-24 11:54:17,487 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 11:54:17,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-24 11:54:17,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2018-10-24 11:54:17,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-24 11:54:17,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-10-24 11:54:17,493 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2018-10-24 11:54:17,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:17,494 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-10-24 11:54:17,494 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 11:54:17,494 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-10-24 11:54:17,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-24 11:54:17,495 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:17,495 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:17,495 INFO L424 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:17,496 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:17,496 INFO L82 PathProgramCache]: Analyzing trace with hash 1469240427, now seen corresponding path program 11 times [2018-10-24 11:54:17,496 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:17,496 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:17,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:17,497 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:17,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:17,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:18,499 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:18,499 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:18,499 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:18,517 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-24 11:55:18,969 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-24 11:55:18,969 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:55:19,507 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:55:19,539 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:55:19,561 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:55:19,561 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 25 [2018-10-24 11:55:19,561 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 11:55:19,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 11:55:19,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-10-24 11:55:19,562 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 25 states. [2018-10-24 11:55:20,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:55:20,618 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-10-24 11:55:20,620 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 11:55:20,620 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 40 [2018-10-24 11:55:20,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:55:20,621 INFO L225 Difference]: With dead ends: 49 [2018-10-24 11:55:20,621 INFO L226 Difference]: Without dead ends: 45 [2018-10-24 11:55:20,622 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 11:55:20,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-24 11:55:20,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2018-10-24 11:55:20,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-24 11:55:20,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-24 11:55:20,628 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2018-10-24 11:55:20,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:55:20,628 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-24 11:55:20,628 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 11:55:20,628 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-24 11:55:20,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-24 11:55:20,629 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:55:20,629 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1] [2018-10-24 11:55:20,630 INFO L424 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:55:20,630 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:55:20,630 INFO L82 PathProgramCache]: Analyzing trace with hash 1776115853, now seen corresponding path program 12 times [2018-10-24 11:55:20,630 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:55:20,630 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:55:20,631 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:55:20,631 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:55:20,631 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:55:20,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:55:21,181 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:55:21,181 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:55:21,181 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:55:21,197 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-24 11:56:16,659 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-24 11:56:16,659 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:56:16,913 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:56:16,943 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:56:16,963 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:56:16,964 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 27 [2018-10-24 11:56:16,964 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 11:56:16,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 11:56:16,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2018-10-24 11:56:16,965 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 27 states. [2018-10-24 11:56:18,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:56:18,344 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2018-10-24 11:56:18,351 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 11:56:18,351 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 43 [2018-10-24 11:56:18,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:56:18,352 INFO L225 Difference]: With dead ends: 52 [2018-10-24 11:56:18,352 INFO L226 Difference]: Without dead ends: 48 [2018-10-24 11:56:18,353 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=147, Invalid=2403, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 11:56:18,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-24 11:56:18,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2018-10-24 11:56:18,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-24 11:56:18,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-10-24 11:56:18,368 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2018-10-24 11:56:18,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:56:18,368 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-10-24 11:56:18,368 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 11:56:18,368 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-10-24 11:56:18,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-24 11:56:18,369 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:56:18,369 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1] [2018-10-24 11:56:18,371 INFO L424 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:56:18,372 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:56:18,372 INFO L82 PathProgramCache]: Analyzing trace with hash -83441365, now seen corresponding path program 13 times [2018-10-24 11:56:18,372 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:56:18,372 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:56:18,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:56:18,373 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:56:18,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:56:18,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:56:19,697 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:56:19,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:56:19,698 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:56:19,711 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:56:19,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:56:19,735 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:56:19,778 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:56:19,809 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:56:19,809 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 29 [2018-10-24 11:56:19,810 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 11:56:19,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 11:56:19,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2018-10-24 11:56:19,812 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 29 states. [2018-10-24 11:56:21,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:56:21,489 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-10-24 11:56:21,489 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-24 11:56:21,490 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 46 [2018-10-24 11:56:21,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:56:21,491 INFO L225 Difference]: With dead ends: 55 [2018-10-24 11:56:21,491 INFO L226 Difference]: Without dead ends: 51 [2018-10-24 11:56:21,493 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=159, Invalid=2811, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 11:56:21,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-24 11:56:21,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2018-10-24 11:56:21,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-24 11:56:21,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-24 11:56:21,499 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 46 [2018-10-24 11:56:21,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:56:21,499 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-24 11:56:21,499 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 11:56:21,499 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-24 11:56:21,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 11:56:21,500 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:56:21,500 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1] [2018-10-24 11:56:21,500 INFO L424 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:56:21,500 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:56:21,501 INFO L82 PathProgramCache]: Analyzing trace with hash -1664338995, now seen corresponding path program 14 times [2018-10-24 11:56:21,501 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:56:21,501 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:56:21,502 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:56:21,502 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:56:21,502 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:56:21,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:56:22,148 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:56:22,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:56:22,148 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:56:22,156 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:56:22,179 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:56:22,180 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:56:22,184 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:56:22,213 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:56:22,242 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:56:22,243 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 31 [2018-10-24 11:56:22,243 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 11:56:22,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 11:56:22,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2018-10-24 11:56:22,244 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 31 states. [2018-10-24 11:56:23,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:56:23,578 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2018-10-24 11:56:23,579 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 11:56:23,579 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 49 [2018-10-24 11:56:23,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:56:23,580 INFO L225 Difference]: With dead ends: 58 [2018-10-24 11:56:23,580 INFO L226 Difference]: Without dead ends: 54 [2018-10-24 11:56:23,582 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=171, Invalid=3251, Unknown=0, NotChecked=0, Total=3422 [2018-10-24 11:56:23,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-24 11:56:23,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2018-10-24 11:56:23,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-24 11:56:23,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-10-24 11:56:23,587 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 49 [2018-10-24 11:56:23,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:56:23,588 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-10-24 11:56:23,588 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 11:56:23,588 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-10-24 11:56:23,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-24 11:56:23,589 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:56:23,589 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1] [2018-10-24 11:56:23,589 INFO L424 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:56:23,589 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:56:23,589 INFO L82 PathProgramCache]: Analyzing trace with hash 425733611, now seen corresponding path program 15 times [2018-10-24 11:56:23,590 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:56:23,590 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:56:23,590 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:56:23,591 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:56:23,591 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:56:23,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:56:24,836 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:56:24,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:56:24,837 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:56:24,844 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:58:10,621 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-24 11:58:10,621 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:58:11,227 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:58:11,904 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:58:11,926 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:58:11,926 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 34] total 34 [2018-10-24 11:58:11,926 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 11:58:11,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 11:58:11,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 11:58:11,927 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 34 states. [2018-10-24 11:58:13,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:58:13,716 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-10-24 11:58:13,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 11:58:13,717 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 52 [2018-10-24 11:58:13,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:58:13,717 INFO L225 Difference]: With dead ends: 61 [2018-10-24 11:58:13,717 INFO L226 Difference]: Without dead ends: 57 [2018-10-24 11:58:13,719 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=185, Invalid=3847, Unknown=0, NotChecked=0, Total=4032 [2018-10-24 11:58:13,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-24 11:58:13,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2018-10-24 11:58:13,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-24 11:58:13,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-10-24 11:58:13,725 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 52 [2018-10-24 11:58:13,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:58:13,726 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-10-24 11:58:13,726 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 11:58:13,726 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-10-24 11:58:13,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-24 11:58:13,727 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:58:13,727 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1] [2018-10-24 11:58:13,727 INFO L424 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:58:13,727 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:58:13,728 INFO L82 PathProgramCache]: Analyzing trace with hash 1637848845, now seen corresponding path program 16 times [2018-10-24 11:58:13,728 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:58:13,728 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:58:13,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:58:13,729 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:58:13,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:58:13,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:58:14,450 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:58:14,450 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:58:14,450 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:58:14,458 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:58:14,484 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:58:14,485 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:58:14,488 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:58:14,532 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:58:14,556 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:58:14,557 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 35 [2018-10-24 11:58:14,557 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 11:58:14,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 11:58:14,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 11:58:14,558 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 35 states. [2018-10-24 11:58:16,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:58:16,224 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2018-10-24 11:58:16,225 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-24 11:58:16,225 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 55 [2018-10-24 11:58:16,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:58:16,226 INFO L225 Difference]: With dead ends: 64 [2018-10-24 11:58:16,226 INFO L226 Difference]: Without dead ends: 60 [2018-10-24 11:58:16,227 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 496 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=195, Invalid=4227, Unknown=0, NotChecked=0, Total=4422 [2018-10-24 11:58:16,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-24 11:58:16,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2018-10-24 11:58:16,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-24 11:58:16,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-10-24 11:58:16,232 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 55 [2018-10-24 11:58:16,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:58:16,232 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-10-24 11:58:16,232 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 11:58:16,232 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-10-24 11:58:16,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-10-24 11:58:16,233 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:58:16,233 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1] [2018-10-24 11:58:16,234 INFO L424 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:58:16,234 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:58:16,234 INFO L82 PathProgramCache]: Analyzing trace with hash -322239829, now seen corresponding path program 17 times [2018-10-24 11:58:16,234 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:58:16,234 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:58:16,235 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:58:16,235 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:58:16,235 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:58:16,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:58:17,296 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:58:17,296 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:58:17,297 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:58:17,304 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown