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/phases_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 11:49:56,742 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 11:49:56,746 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 11:49:56,765 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 11:49:56,765 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 11:49:56,766 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 11:49:56,767 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 11:49:56,769 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 11:49:56,771 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 11:49:56,772 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 11:49:56,774 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 11:49:56,774 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 11:49:56,775 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 11:49:56,783 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 11:49:56,784 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 11:49:56,785 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 11:49:56,789 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 11:49:56,791 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 11:49:56,798 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 11:49:56,800 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 11:49:56,800 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 11:49:56,803 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 11:49:56,808 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-24 11:49:56,820 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 11:49:56,834 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 11:49:56,834 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 11:49:56,835 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 11:49:56,835 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-24 11:49:56,835 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-24 11:49:56,836 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-24 11:49:56,836 INFO L133 SettingsManager]: * Use SBE=true [2018-10-24 11:49:56,836 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 11:49:56,836 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 11:49:56,836 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 11:49:56,837 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 11:49:56,837 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 11:49:56,837 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 11:49:56,837 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 11:49:56,837 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 11:49:56,838 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 11:49:56,838 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 11:49:56,838 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 11:49:56,838 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 11:49:56,838 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 11:49:56,838 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 11:49:56,839 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 11:49:56,839 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 11:49:56,839 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-24 11:49:56,839 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 11:49:56,839 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 11:49:56,840 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 11:49:56,840 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 11:49:56,909 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 11:49:56,929 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 11:49:56,934 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 11:49:56,936 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 11:49:56,936 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 11:49:56,937 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/phases_false-unreach-call1.i [2018-10-24 11:49:57,002 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/6ba6865ae/81132e209eca46ae88590d439de23743/FLAG55e793dcd [2018-10-24 11:49:57,388 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 11:49:57,389 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_false-unreach-call1.i [2018-10-24 11:49:57,397 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/6ba6865ae/81132e209eca46ae88590d439de23743/FLAG55e793dcd [2018-10-24 11:49:57,418 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/6ba6865ae/81132e209eca46ae88590d439de23743 [2018-10-24 11:49:57,428 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 11:49:57,430 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 11:49:57,431 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 11:49:57,431 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 11:49:57,436 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 11:49:57,437 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:49:57" (1/1) ... [2018-10-24 11:49:57,440 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@68ac229 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:57, skipping insertion in model container [2018-10-24 11:49:57,440 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:49:57" (1/1) ... [2018-10-24 11:49:57,451 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 11:49:57,471 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 11:49:57,691 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 11:49:57,695 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 11:49:57,714 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 11:49:57,734 INFO L193 MainTranslator]: Completed translation [2018-10-24 11:49:57,734 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:57 WrapperNode [2018-10-24 11:49:57,734 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 11:49:57,735 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 11:49:57,735 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 11:49:57,735 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 11:49:57,744 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:57" (1/1) ... [2018-10-24 11:49:57,749 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:57" (1/1) ... [2018-10-24 11:49:57,765 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 11:49:57,765 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 11:49:57,766 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 11:49:57,766 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 11:49:57,774 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:57" (1/1) ... [2018-10-24 11:49:57,775 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:57" (1/1) ... [2018-10-24 11:49:57,775 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:57" (1/1) ... [2018-10-24 11:49:57,775 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:57" (1/1) ... [2018-10-24 11:49:57,777 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:57" (1/1) ... [2018-10-24 11:49:57,782 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:57" (1/1) ... [2018-10-24 11:49:57,782 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:57" (1/1) ... [2018-10-24 11:49:57,784 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 11:49:57,784 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 11:49:57,784 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 11:49:57,785 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 11:49:57,785 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:57" (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 11:49:57,905 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 11:49:57,905 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 11:49:58,079 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 11:49:58,080 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:49:58 BoogieIcfgContainer [2018-10-24 11:49:58,080 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 11:49:58,081 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 11:49:58,081 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 11:49:58,084 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 11:49:58,085 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 11:49:57" (1/3) ... [2018-10-24 11:49:58,086 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33af70db and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:49:58, skipping insertion in model container [2018-10-24 11:49:58,086 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:57" (2/3) ... [2018-10-24 11:49:58,086 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33af70db and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:49:58, skipping insertion in model container [2018-10-24 11:49:58,086 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:49:58" (3/3) ... [2018-10-24 11:49:58,088 INFO L112 eAbstractionObserver]: Analyzing ICFG phases_false-unreach-call1.i [2018-10-24 11:49:58,098 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 11:49:58,106 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 11:49:58,123 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 11:49:58,151 INFO L135 ementStrategyFactory]: Using default assertion order modulation [2018-10-24 11:49:58,152 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 11:49:58,152 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 11:49:58,152 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 11:49:58,152 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 11:49:58,152 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 11:49:58,153 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 11:49:58,153 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 11:49:58,153 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 11:49:58,165 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states. [2018-10-24 11:49:58,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-24 11:49:58,171 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:58,172 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-10-24 11:49:58,174 INFO L424 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:58,180 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:58,181 INFO L82 PathProgramCache]: Analyzing trace with hash 889968487, now seen corresponding path program 1 times [2018-10-24 11:49:58,183 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:58,183 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:58,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:58,232 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:49:58,232 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:58,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:58,281 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 11:49:58,283 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 11:49:58,284 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 11:49:58,287 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 11:49:58,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 11:49:58,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 11:49:58,303 INFO L87 Difference]: Start difference. First operand 13 states. Second operand 2 states. [2018-10-24 11:49:58,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:58,321 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2018-10-24 11:49:58,321 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 11:49:58,322 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 6 [2018-10-24 11:49:58,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:58,334 INFO L225 Difference]: With dead ends: 21 [2018-10-24 11:49:58,334 INFO L226 Difference]: Without dead ends: 9 [2018-10-24 11:49:58,345 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 11:49:58,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-10-24 11:49:58,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-10-24 11:49:58,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-10-24 11:49:58,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2018-10-24 11:49:58,381 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2018-10-24 11:49:58,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:58,381 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2018-10-24 11:49:58,382 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 11:49:58,382 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2018-10-24 11:49:58,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-10-24 11:49:58,382 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:58,382 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:58,383 INFO L424 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:58,383 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:58,383 INFO L82 PathProgramCache]: Analyzing trace with hash 1805929617, now seen corresponding path program 1 times [2018-10-24 11:49:58,383 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:58,383 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:58,384 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:58,384 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:49:58,385 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:58,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:58,527 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 11:49:58,527 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 11:49:58,528 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 11:49:58,530 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 11:49:58,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 11:49:58,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 11:49:58,531 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 3 states. [2018-10-24 11:49:58,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:58,626 INFO L93 Difference]: Finished difference Result 19 states and 23 transitions. [2018-10-24 11:49:58,626 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 11:49:58,627 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 7 [2018-10-24 11:49:58,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:58,627 INFO L225 Difference]: With dead ends: 19 [2018-10-24 11:49:58,628 INFO L226 Difference]: Without dead ends: 12 [2018-10-24 11:49:58,629 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 11:49:58,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-24 11:49:58,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-24 11:49:58,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-24 11:49:58,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2018-10-24 11:49:58,636 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 7 [2018-10-24 11:49:58,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:58,636 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2018-10-24 11:49:58,636 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 11:49:58,636 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2018-10-24 11:49:58,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-24 11:49:58,637 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:58,637 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:58,638 INFO L424 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:58,638 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:58,638 INFO L82 PathProgramCache]: Analyzing trace with hash -1049525042, now seen corresponding path program 1 times [2018-10-24 11:49:58,638 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:58,638 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:58,639 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:58,639 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:49:58,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:58,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:58,789 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 11:49:58,789 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:49:58,790 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 11:49:58,803 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:49:58,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:58,826 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:49:58,869 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 11:49:58,889 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:49:58,890 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-10-24 11:49:58,890 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 11:49:58,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 11:49:58,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-24 11:49:58,891 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand 4 states. [2018-10-24 11:49:58,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:58,976 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2018-10-24 11:49:58,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 11:49:58,979 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 10 [2018-10-24 11:49:58,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:58,980 INFO L225 Difference]: With dead ends: 22 [2018-10-24 11:49:58,980 INFO L226 Difference]: Without dead ends: 15 [2018-10-24 11:49:58,981 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-24 11:49:58,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-24 11:49:58,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-24 11:49:58,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-24 11:49:58,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-10-24 11:49:58,988 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2018-10-24 11:49:58,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:58,988 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-10-24 11:49:58,988 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 11:49:58,988 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-10-24 11:49:58,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 11:49:58,989 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:58,989 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:58,989 INFO L424 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:58,989 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:58,990 INFO L82 PathProgramCache]: Analyzing trace with hash -1777006735, now seen corresponding path program 2 times [2018-10-24 11:49:58,990 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:58,990 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:58,991 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:58,991 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:49:58,991 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:59,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:59,126 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 11:49:59,127 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:49:59,127 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 11:49:59,147 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:49:59,174 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:49:59,174 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:49:59,177 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:49:59,239 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 11:49:59,260 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:49:59,260 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-24 11:49:59,260 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 11:49:59,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 11:49:59,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 11:49:59,261 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2018-10-24 11:49:59,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:59,396 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2018-10-24 11:49:59,397 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 11:49:59,397 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-10-24 11:49:59,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:59,398 INFO L225 Difference]: With dead ends: 25 [2018-10-24 11:49:59,398 INFO L226 Difference]: Without dead ends: 18 [2018-10-24 11:49:59,399 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 11:49:59,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-24 11:49:59,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-24 11:49:59,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 11:49:59,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-10-24 11:49:59,403 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-10-24 11:49:59,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:59,404 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-10-24 11:49:59,404 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 11:49:59,404 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-10-24 11:49:59,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-24 11:49:59,405 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:59,405 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:59,405 INFO L424 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:59,405 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:59,406 INFO L82 PathProgramCache]: Analyzing trace with hash -1779147282, now seen corresponding path program 3 times [2018-10-24 11:49:59,406 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:59,406 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:59,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:59,407 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:49:59,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:59,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:59,592 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 11:49:59,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:49:59,593 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 11:49:59,609 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:49:59,643 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-24 11:49:59,643 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:49:59,646 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:49:59,742 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-24 11:49:59,762 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-10-24 11:49:59,763 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2018-10-24 11:49:59,763 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 11:49:59,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 11:49:59,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-10-24 11:49:59,764 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 7 states. [2018-10-24 11:49:59,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:59,857 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2018-10-24 11:49:59,858 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 11:49:59,858 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2018-10-24 11:49:59,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:59,859 INFO L225 Difference]: With dead ends: 31 [2018-10-24 11:49:59,859 INFO L226 Difference]: Without dead ends: 24 [2018-10-24 11:49:59,860 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-10-24 11:49:59,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-24 11:49:59,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2018-10-24 11:49:59,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-24 11:49:59,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-10-24 11:49:59,865 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 16 [2018-10-24 11:49:59,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:59,865 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-10-24 11:49:59,865 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 11:49:59,866 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-10-24 11:49:59,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-24 11:49:59,866 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:59,866 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 4, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:59,867 INFO L424 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:59,867 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:59,867 INFO L82 PathProgramCache]: Analyzing trace with hash 1231130700, now seen corresponding path program 1 times [2018-10-24 11:49:59,867 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:59,868 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:59,869 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:59,869 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:49:59,869 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:59,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:00,112 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 11:50:00,113 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:00,113 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 11:50:00,128 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:50:00,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:00,142 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:00,195 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:00,224 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:00,224 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 8 [2018-10-24 11:50:00,225 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 11:50:00,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 11:50:00,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-24 11:50:00,225 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 8 states. [2018-10-24 11:50:00,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:00,713 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2018-10-24 11:50:00,716 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 11:50:00,717 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2018-10-24 11:50:00,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:00,718 INFO L225 Difference]: With dead ends: 35 [2018-10-24 11:50:00,718 INFO L226 Difference]: Without dead ends: 26 [2018-10-24 11:50:00,718 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-24 11:50:00,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-24 11:50:00,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-24 11:50:00,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-24 11:50:00,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2018-10-24 11:50:00,729 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 22 [2018-10-24 11:50:00,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:00,729 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2018-10-24 11:50:00,729 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 11:50:00,729 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2018-10-24 11:50:00,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 11:50:00,732 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:00,732 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 5, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:00,734 INFO L424 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:00,734 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:00,734 INFO L82 PathProgramCache]: Analyzing trace with hash -1472252305, now seen corresponding path program 2 times [2018-10-24 11:50:00,735 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:00,737 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:00,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:00,738 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:50:00,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:00,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:01,021 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 11:50:01,022 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:01,022 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 11:50:01,029 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:50:01,040 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:50:01,040 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:01,043 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:01,058 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 11:50:01,080 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:01,080 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-24 11:50:01,081 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 11:50:01,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 11:50:01,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-24 11:50:01,082 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 9 states. [2018-10-24 11:50:01,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:01,235 INFO L93 Difference]: Finished difference Result 38 states and 41 transitions. [2018-10-24 11:50:01,236 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 11:50:01,236 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2018-10-24 11:50:01,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:01,237 INFO L225 Difference]: With dead ends: 38 [2018-10-24 11:50:01,237 INFO L226 Difference]: Without dead ends: 29 [2018-10-24 11:50:01,238 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-24 11:50:01,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-24 11:50:01,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-10-24 11:50:01,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-24 11:50:01,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2018-10-24 11:50:01,245 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 25 [2018-10-24 11:50:01,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:01,245 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2018-10-24 11:50:01,245 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 11:50:01,245 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2018-10-24 11:50:01,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-24 11:50:01,246 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:01,246 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 6, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:01,246 INFO L424 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:01,247 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:01,247 INFO L82 PathProgramCache]: Analyzing trace with hash 1271380332, now seen corresponding path program 3 times [2018-10-24 11:50:01,247 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:01,247 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:01,248 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:01,248 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:01,248 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:01,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:01,554 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 11:50:01,554 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:01,554 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 11:50:01,562 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:50:01,576 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 11:50:01,576 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:01,578 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:01,627 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 2 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-24 11:50:01,648 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:01,648 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 4] total 12 [2018-10-24 11:50:01,648 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 11:50:01,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 11:50:01,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2018-10-24 11:50:01,649 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 12 states. [2018-10-24 11:50:04,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:04,352 INFO L93 Difference]: Finished difference Result 48 states and 55 transitions. [2018-10-24 11:50:04,353 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 11:50:04,353 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2018-10-24 11:50:04,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:04,354 INFO L225 Difference]: With dead ends: 48 [2018-10-24 11:50:04,354 INFO L226 Difference]: Without dead ends: 39 [2018-10-24 11:50:04,355 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2018-10-24 11:50:04,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-24 11:50:04,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 35. [2018-10-24 11:50:04,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-24 11:50:04,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2018-10-24 11:50:04,361 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 28 [2018-10-24 11:50:04,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:04,361 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2018-10-24 11:50:04,361 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 11:50:04,361 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2018-10-24 11:50:04,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-24 11:50:04,362 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:04,363 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 7, 2, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:04,363 INFO L424 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:04,363 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:04,363 INFO L82 PathProgramCache]: Analyzing trace with hash 242968718, now seen corresponding path program 4 times [2018-10-24 11:50:04,364 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:04,364 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:04,364 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:04,365 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:04,365 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:04,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:04,671 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 11:50:04,671 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:04,671 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 11:50:04,689 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:50:04,714 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:50:04,715 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:04,717 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:04,767 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 40 proven. 84 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 11:50:04,788 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:04,789 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 12 [2018-10-24 11:50:04,789 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 11:50:04,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 11:50:04,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-24 11:50:04,790 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 12 states. [2018-10-24 11:50:04,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:04,989 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2018-10-24 11:50:04,990 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 11:50:04,990 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2018-10-24 11:50:04,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:04,992 INFO L225 Difference]: With dead ends: 50 [2018-10-24 11:50:04,992 INFO L226 Difference]: Without dead ends: 38 [2018-10-24 11:50:04,993 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-24 11:50:04,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-24 11:50:04,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-24 11:50:04,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-24 11:50:04,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-10-24 11:50:04,998 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 34 [2018-10-24 11:50:04,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:04,998 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-10-24 11:50:04,999 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 11:50:04,999 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-10-24 11:50:04,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-24 11:50:05,000 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:05,000 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 8, 2, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:05,000 INFO L424 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:05,000 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:05,001 INFO L82 PathProgramCache]: Analyzing trace with hash -1678118351, now seen corresponding path program 5 times [2018-10-24 11:50:05,001 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:05,001 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:05,002 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:05,002 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:05,002 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:05,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:05,440 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 11:50:05,440 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:05,440 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 11:50:05,450 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-24 11:50:38,791 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2018-10-24 11:50:38,792 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:38,874 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:38,905 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 11:50:38,926 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:38,926 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-24 11:50:38,926 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 11:50:38,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 11:50:38,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-24 11:50:38,927 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 13 states. [2018-10-24 11:50:39,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:39,311 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2018-10-24 11:50:39,313 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 11:50:39,313 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 37 [2018-10-24 11:50:39,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:39,314 INFO L225 Difference]: With dead ends: 53 [2018-10-24 11:50:39,314 INFO L226 Difference]: Without dead ends: 41 [2018-10-24 11:50:39,315 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-24 11:50:39,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-10-24 11:50:39,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-10-24 11:50:39,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-24 11:50:39,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2018-10-24 11:50:39,321 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 37 [2018-10-24 11:50:39,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:39,322 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2018-10-24 11:50:39,322 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 11:50:39,322 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2018-10-24 11:50:39,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-24 11:50:39,323 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:39,323 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 9, 2, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:39,323 INFO L424 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:39,324 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:39,324 INFO L82 PathProgramCache]: Analyzing trace with hash 1951195566, now seen corresponding path program 6 times [2018-10-24 11:50:39,324 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:39,324 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:39,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:39,325 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:39,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:39,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:39,633 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 11:50:39,634 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:39,634 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 11:50:39,641 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-24 11:50:39,683 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2018-10-24 11:50:39,683 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:39,685 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:39,787 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 72 proven. 7 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-24 11:50:39,812 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:39,812 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 5] total 17 [2018-10-24 11:50:39,813 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 11:50:39,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 11:50:39,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2018-10-24 11:50:39,814 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 17 states. [2018-10-24 11:50:40,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:40,728 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2018-10-24 11:50:40,728 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 11:50:40,729 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 40 [2018-10-24 11:50:40,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:40,731 INFO L225 Difference]: With dead ends: 63 [2018-10-24 11:50:40,731 INFO L226 Difference]: Without dead ends: 51 [2018-10-24 11:50:40,731 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2018-10-24 11:50:40,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-24 11:50:40,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 47. [2018-10-24 11:50:40,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-24 11:50:40,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2018-10-24 11:50:40,738 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 40 [2018-10-24 11:50:40,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:40,738 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2018-10-24 11:50:40,738 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 11:50:40,739 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2018-10-24 11:50:40,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-24 11:50:40,739 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:40,740 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 10, 3, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:40,740 INFO L424 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:40,740 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:40,740 INFO L82 PathProgramCache]: Analyzing trace with hash -141931124, now seen corresponding path program 7 times [2018-10-24 11:50:40,740 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:40,741 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:40,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:40,742 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:40,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:40,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:41,146 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 11:50:41,146 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:41,146 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 11:50:41,154 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:50:41,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:41,172 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:41,252 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 88 proven. 165 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-24 11:50:41,272 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:41,272 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 16 [2018-10-24 11:50:41,273 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 11:50:41,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 11:50:41,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-24 11:50:41,274 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand 16 states. [2018-10-24 11:50:41,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:41,640 INFO L93 Difference]: Finished difference Result 65 states and 72 transitions. [2018-10-24 11:50:41,640 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 11:50:41,640 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2018-10-24 11:50:41,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:41,642 INFO L225 Difference]: With dead ends: 65 [2018-10-24 11:50:41,642 INFO L226 Difference]: Without dead ends: 50 [2018-10-24 11:50:41,643 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-24 11:50:41,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-10-24 11:50:41,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-10-24 11:50:41,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-24 11:50:41,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 53 transitions. [2018-10-24 11:50:41,650 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 53 transitions. Word has length 46 [2018-10-24 11:50:41,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:41,650 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 53 transitions. [2018-10-24 11:50:41,650 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 11:50:41,650 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 53 transitions. [2018-10-24 11:50:41,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 11:50:41,651 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:41,651 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 11, 3, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:41,652 INFO L424 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:41,652 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:41,652 INFO L82 PathProgramCache]: Analyzing trace with hash 871398063, now seen corresponding path program 8 times [2018-10-24 11:50:41,652 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:41,652 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:41,653 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:41,653 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:50:41,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:41,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:42,006 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 11:50:42,007 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:42,007 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 11:50:42,015 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:50:42,062 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:50:42,062 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:42,066 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:42,142 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 11:50:42,176 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:42,176 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-24 11:50:42,177 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 11:50:42,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 11:50:42,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-24 11:50:42,178 INFO L87 Difference]: Start difference. First operand 50 states and 53 transitions. Second operand 17 states. [2018-10-24 11:50:42,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:42,665 INFO L93 Difference]: Finished difference Result 68 states and 75 transitions. [2018-10-24 11:50:42,666 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 11:50:42,666 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 49 [2018-10-24 11:50:42,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:42,668 INFO L225 Difference]: With dead ends: 68 [2018-10-24 11:50:42,668 INFO L226 Difference]: Without dead ends: 53 [2018-10-24 11:50:42,669 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-24 11:50:42,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-10-24 11:50:42,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-10-24 11:50:42,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-24 11:50:42,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2018-10-24 11:50:42,676 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 49 [2018-10-24 11:50:42,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:42,677 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2018-10-24 11:50:42,677 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 11:50:42,677 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2018-10-24 11:50:42,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-24 11:50:42,678 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:42,678 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 12, 3, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:42,678 INFO L424 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:42,678 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:42,679 INFO L82 PathProgramCache]: Analyzing trace with hash -363915604, now seen corresponding path program 9 times [2018-10-24 11:50:42,679 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:42,679 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:42,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:42,680 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:42,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:42,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:43,073 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 11:50:43,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:43,073 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 11:50:43,081 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:50:43,098 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 11:50:43,098 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:43,100 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:43,333 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 132 proven. 15 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-24 11:50:43,353 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:43,353 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 6] total 22 [2018-10-24 11:50:43,353 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 11:50:43,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 11:50:43,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=373, Unknown=0, NotChecked=0, Total=462 [2018-10-24 11:50:43,354 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 22 states. [2018-10-24 11:50:48,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:48,210 INFO L93 Difference]: Finished difference Result 78 states and 89 transitions. [2018-10-24 11:50:48,211 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 11:50:48,211 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 52 [2018-10-24 11:50:48,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:48,211 INFO L225 Difference]: With dead ends: 78 [2018-10-24 11:50:48,211 INFO L226 Difference]: Without dead ends: 63 [2018-10-24 11:50:48,212 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=134, Invalid=466, Unknown=0, NotChecked=0, Total=600 [2018-10-24 11:50:48,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-24 11:50:48,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 59. [2018-10-24 11:50:48,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-24 11:50:48,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 63 transitions. [2018-10-24 11:50:48,218 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 63 transitions. Word has length 52 [2018-10-24 11:50:48,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:48,218 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 63 transitions. [2018-10-24 11:50:48,218 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 11:50:48,218 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 63 transitions. [2018-10-24 11:50:48,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-10-24 11:50:48,219 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:48,219 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 13, 4, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:48,220 INFO L424 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:48,220 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:48,220 INFO L82 PathProgramCache]: Analyzing trace with hash -820552626, now seen corresponding path program 10 times [2018-10-24 11:50:48,220 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:48,220 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:48,221 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:48,221 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:48,221 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:48,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:48,710 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 11:50:48,710 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:48,710 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 11:50:48,723 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:50:48,743 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:50:48,743 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:48,745 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:48,984 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 154 proven. 273 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 11:50:49,004 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:49,004 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 16] total 20 [2018-10-24 11:50:49,004 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 11:50:49,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 11:50:49,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-24 11:50:49,005 INFO L87 Difference]: Start difference. First operand 59 states and 63 transitions. Second operand 20 states. [2018-10-24 11:50:49,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:49,835 INFO L93 Difference]: Finished difference Result 80 states and 89 transitions. [2018-10-24 11:50:49,836 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 11:50:49,836 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 58 [2018-10-24 11:50:49,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:49,837 INFO L225 Difference]: With dead ends: 80 [2018-10-24 11:50:49,837 INFO L226 Difference]: Without dead ends: 62 [2018-10-24 11:50:49,838 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 57 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-24 11:50:49,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-10-24 11:50:49,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2018-10-24 11:50:49,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-10-24 11:50:49,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2018-10-24 11:50:49,845 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 58 [2018-10-24 11:50:49,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:49,846 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2018-10-24 11:50:49,846 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 11:50:49,846 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2018-10-24 11:50:49,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-24 11:50:49,847 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:49,847 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 14, 4, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:49,847 INFO L424 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:49,847 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:49,847 INFO L82 PathProgramCache]: Analyzing trace with hash 1183575281, now seen corresponding path program 11 times [2018-10-24 11:50:49,848 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:49,848 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:49,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:49,849 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:49,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:49,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:50,434 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:50,434 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:50,434 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 11:50:50,445 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-24 11:54:09,767 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2018-10-24 11:54:09,768 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:10,089 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:10,185 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 128 proven. 360 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-24 11:54:10,205 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:10,205 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18] total 21 [2018-10-24 11:54:10,206 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 11:54:10,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 11:54:10,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-10-24 11:54:10,208 INFO L87 Difference]: Start difference. First operand 62 states and 66 transitions. Second operand 21 states. [2018-10-24 11:54:10,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:10,802 INFO L93 Difference]: Finished difference Result 83 states and 92 transitions. [2018-10-24 11:54:10,802 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 11:54:10,802 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 61 [2018-10-24 11:54:10,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:10,804 INFO L225 Difference]: With dead ends: 83 [2018-10-24 11:54:10,804 INFO L226 Difference]: Without dead ends: 65 [2018-10-24 11:54:10,805 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 60 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-10-24 11:54:10,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-10-24 11:54:10,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2018-10-24 11:54:10,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-10-24 11:54:10,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 69 transitions. [2018-10-24 11:54:10,811 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 69 transitions. Word has length 61 [2018-10-24 11:54:10,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:10,812 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 69 transitions. [2018-10-24 11:54:10,812 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 11:54:10,812 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 69 transitions. [2018-10-24 11:54:10,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-24 11:54:10,813 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:10,813 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 15, 4, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:10,813 INFO L424 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:10,813 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:10,814 INFO L82 PathProgramCache]: Analyzing trace with hash 1817671022, now seen corresponding path program 12 times [2018-10-24 11:54:10,814 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:10,814 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:10,814 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:10,815 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:10,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:10,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:11,137 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:11,137 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:11,137 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 11:54:11,144 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-24 11:54:13,171 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2018-10-24 11:54:13,171 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:13,190 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:13,478 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 210 proven. 26 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-24 11:54:13,500 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:13,500 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 7] total 27 [2018-10-24 11:54:13,501 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 11:54:13,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 11:54:13,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=576, Unknown=0, NotChecked=0, Total=702 [2018-10-24 11:54:13,502 INFO L87 Difference]: Start difference. First operand 65 states and 69 transitions. Second operand 27 states. [2018-10-24 11:54:20,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:20,067 INFO L93 Difference]: Finished difference Result 93 states and 106 transitions. [2018-10-24 11:54:20,068 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 11:54:20,068 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 64 [2018-10-24 11:54:20,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:20,069 INFO L225 Difference]: With dead ends: 93 [2018-10-24 11:54:20,069 INFO L226 Difference]: Without dead ends: 75 [2018-10-24 11:54:20,070 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=198, Invalid=732, Unknown=0, NotChecked=0, Total=930 [2018-10-24 11:54:20,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-24 11:54:20,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 71. [2018-10-24 11:54:20,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-10-24 11:54:20,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 76 transitions. [2018-10-24 11:54:20,077 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 76 transitions. Word has length 64 [2018-10-24 11:54:20,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:20,077 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 76 transitions. [2018-10-24 11:54:20,077 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 11:54:20,077 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 76 transitions. [2018-10-24 11:54:20,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-10-24 11:54:20,078 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:20,078 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 16, 5, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:20,078 INFO L424 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:20,079 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:20,079 INFO L82 PathProgramCache]: Analyzing trace with hash -1152648500, now seen corresponding path program 13 times [2018-10-24 11:54:20,079 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:20,079 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:20,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:20,080 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:20,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:20,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:20,790 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:20,790 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:20,790 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 11:54:20,798 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:20,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:20,824 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:20,909 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 238 proven. 408 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-24 11:54:20,929 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:20,929 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 19] total 24 [2018-10-24 11:54:20,929 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 11:54:20,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 11:54:20,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-10-24 11:54:20,930 INFO L87 Difference]: Start difference. First operand 71 states and 76 transitions. Second operand 24 states. [2018-10-24 11:54:21,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:21,578 INFO L93 Difference]: Finished difference Result 95 states and 106 transitions. [2018-10-24 11:54:21,580 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 11:54:21,580 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 70 [2018-10-24 11:54:21,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:21,581 INFO L225 Difference]: With dead ends: 95 [2018-10-24 11:54:21,581 INFO L226 Difference]: Without dead ends: 74 [2018-10-24 11:54:21,582 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 69 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-10-24 11:54:21,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-24 11:54:21,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2018-10-24 11:54:21,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-24 11:54:21,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 79 transitions. [2018-10-24 11:54:21,588 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 79 transitions. Word has length 70 [2018-10-24 11:54:21,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:21,589 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 79 transitions. [2018-10-24 11:54:21,589 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 11:54:21,589 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 79 transitions. [2018-10-24 11:54:21,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-10-24 11:54:21,590 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:21,590 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 17, 5, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:21,590 INFO L424 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:21,590 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:21,591 INFO L82 PathProgramCache]: Analyzing trace with hash 903196399, now seen corresponding path program 14 times [2018-10-24 11:54:21,591 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:21,591 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:21,592 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:21,592 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:21,592 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:21,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:22,096 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:22,096 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:22,096 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 11:54:22,107 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:54:22,126 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:54:22,126 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:22,128 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:22,167 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:22,195 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:22,196 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 25 [2018-10-24 11:54:22,196 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 11:54:22,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 11:54:22,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-10-24 11:54:22,199 INFO L87 Difference]: Start difference. First operand 74 states and 79 transitions. Second operand 25 states. [2018-10-24 11:54:23,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:23,345 INFO L93 Difference]: Finished difference Result 98 states and 109 transitions. [2018-10-24 11:54:23,346 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 11:54:23,346 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 73 [2018-10-24 11:54:23,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:23,347 INFO L225 Difference]: With dead ends: 98 [2018-10-24 11:54:23,347 INFO L226 Difference]: Without dead ends: 77 [2018-10-24 11:54:23,348 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-10-24 11:54:23,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-10-24 11:54:23,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2018-10-24 11:54:23,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-24 11:54:23,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 82 transitions. [2018-10-24 11:54:23,355 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 82 transitions. Word has length 73 [2018-10-24 11:54:23,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:23,356 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 82 transitions. [2018-10-24 11:54:23,356 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 11:54:23,356 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 82 transitions. [2018-10-24 11:54:23,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-24 11:54:23,357 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:23,357 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 18, 5, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:23,357 INFO L424 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:23,357 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:23,358 INFO L82 PathProgramCache]: Analyzing trace with hash 344941548, now seen corresponding path program 15 times [2018-10-24 11:54:23,358 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:23,358 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:23,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:23,359 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:23,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:23,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:25,032 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:25,032 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:25,033 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:25,040 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:54:25,076 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 11:54:25,076 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:25,078 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:25,391 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 306 proven. 40 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2018-10-24 11:54:25,411 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:25,411 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 8] total 32 [2018-10-24 11:54:25,412 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 11:54:25,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 11:54:25,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=823, Unknown=0, NotChecked=0, Total=992 [2018-10-24 11:54:25,413 INFO L87 Difference]: Start difference. First operand 77 states and 82 transitions. Second operand 32 states. [2018-10-24 11:54:31,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:31,174 INFO L93 Difference]: Finished difference Result 108 states and 123 transitions. [2018-10-24 11:54:31,175 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 11:54:31,175 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 76 [2018-10-24 11:54:31,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:31,176 INFO L225 Difference]: With dead ends: 108 [2018-10-24 11:54:31,176 INFO L226 Difference]: Without dead ends: 87 [2018-10-24 11:54:31,177 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=274, Invalid=1058, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 11:54:31,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-24 11:54:31,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 83. [2018-10-24 11:54:31,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-10-24 11:54:31,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 89 transitions. [2018-10-24 11:54:31,185 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 89 transitions. Word has length 76 [2018-10-24 11:54:31,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:31,185 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 89 transitions. [2018-10-24 11:54:31,185 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 11:54:31,185 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 89 transitions. [2018-10-24 11:54:31,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-10-24 11:54:31,186 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:31,186 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 19, 6, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:31,186 INFO L424 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:31,187 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:31,187 INFO L82 PathProgramCache]: Analyzing trace with hash 1406754830, now seen corresponding path program 16 times [2018-10-24 11:54:31,187 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:31,187 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:31,188 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:31,188 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:31,188 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:31,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:32,160 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 50 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:32,160 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:32,160 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:32,169 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:54:32,190 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:54:32,190 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:32,192 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:32,277 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 340 proven. 570 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 11:54:32,298 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:32,299 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 22] total 28 [2018-10-24 11:54:32,299 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 11:54:32,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 11:54:32,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2018-10-24 11:54:32,300 INFO L87 Difference]: Start difference. First operand 83 states and 89 transitions. Second operand 28 states. [2018-10-24 11:54:33,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:33,093 INFO L93 Difference]: Finished difference Result 113 states and 127 transitions. [2018-10-24 11:54:33,093 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 11:54:33,094 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 82 [2018-10-24 11:54:33,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:33,095 INFO L225 Difference]: With dead ends: 113 [2018-10-24 11:54:33,095 INFO L226 Difference]: Without dead ends: 89 [2018-10-24 11:54:33,096 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2018-10-24 11:54:33,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-10-24 11:54:33,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2018-10-24 11:54:33,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-24 11:54:33,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 95 transitions. [2018-10-24 11:54:33,103 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 95 transitions. Word has length 82 [2018-10-24 11:54:33,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:33,104 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 95 transitions. [2018-10-24 11:54:33,104 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 11:54:33,104 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 95 transitions. [2018-10-24 11:54:33,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-10-24 11:54:33,105 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:33,105 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 21, 6, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:33,105 INFO L424 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:33,105 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:33,106 INFO L82 PathProgramCache]: Analyzing trace with hash 1856510254, now seen corresponding path program 17 times [2018-10-24 11:54:33,106 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:33,106 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:33,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:33,107 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:33,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:33,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:33,967 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 54 proven. 1053 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:33,967 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:33,967 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:33,983 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown