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/const_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 11:49:37,427 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 11:49:37,429 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 11:49:37,442 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 11:49:37,443 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 11:49:37,444 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 11:49:37,445 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 11:49:37,447 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 11:49:37,449 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 11:49:37,452 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 11:49:37,453 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 11:49:37,453 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 11:49:37,454 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 11:49:37,459 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 11:49:37,460 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 11:49:37,461 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 11:49:37,467 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 11:49:37,468 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 11:49:37,472 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 11:49:37,475 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 11:49:37,478 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 11:49:37,479 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 11:49:37,481 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 11:49:37,482 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 11:49:37,484 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 11:49:37,485 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 11:49:37,486 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 11:49:37,486 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 11:49:37,487 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 11:49:37,488 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 11:49:37,488 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 11:49:37,489 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-24 11:49:37,491 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 11:49:37,511 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 11:49:37,511 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 11:49:37,512 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 11:49:37,512 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-24 11:49:37,517 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-24 11:49:37,517 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-24 11:49:37,517 INFO L133 SettingsManager]: * Use SBE=true [2018-10-24 11:49:37,518 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 11:49:37,518 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 11:49:37,518 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 11:49:37,518 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 11:49:37,518 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 11:49:37,519 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 11:49:37,519 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 11:49:37,519 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 11:49:37,519 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 11:49:37,519 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 11:49:37,520 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 11:49:37,520 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 11:49:37,520 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 11:49:37,520 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 11:49:37,520 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 11:49:37,521 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 11:49:37,522 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-24 11:49:37,522 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 11:49:37,522 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 11:49:37,523 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 11:49:37,523 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 11:49:37,586 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 11:49:37,604 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 11:49:37,607 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 11:49:37,609 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 11:49:37,609 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 11:49:37,609 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/const_false-unreach-call1.i [2018-10-24 11:49:37,673 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/ca1fc9b6b/ed7dbfaf16b04469bae032eefd330461/FLAG5a2730a94 [2018-10-24 11:49:38,144 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 11:49:38,145 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/const_false-unreach-call1.i [2018-10-24 11:49:38,151 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/ca1fc9b6b/ed7dbfaf16b04469bae032eefd330461/FLAG5a2730a94 [2018-10-24 11:49:38,168 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/ca1fc9b6b/ed7dbfaf16b04469bae032eefd330461 [2018-10-24 11:49:38,181 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 11:49:38,183 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 11:49:38,184 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 11:49:38,184 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 11:49:38,188 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 11:49:38,189 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:49:38" (1/1) ... [2018-10-24 11:49:38,192 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@601f4e92 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:38, skipping insertion in model container [2018-10-24 11:49:38,193 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:49:38" (1/1) ... [2018-10-24 11:49:38,203 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 11:49:38,223 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 11:49:38,381 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 11:49:38,385 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 11:49:38,403 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 11:49:38,420 INFO L193 MainTranslator]: Completed translation [2018-10-24 11:49:38,420 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:38 WrapperNode [2018-10-24 11:49:38,420 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 11:49:38,421 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 11:49:38,422 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 11:49:38,422 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 11:49:38,432 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:38" (1/1) ... [2018-10-24 11:49:38,438 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:38" (1/1) ... [2018-10-24 11:49:38,460 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 11:49:38,461 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 11:49:38,461 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 11:49:38,461 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 11:49:38,472 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:38" (1/1) ... [2018-10-24 11:49:38,472 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:38" (1/1) ... [2018-10-24 11:49:38,473 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:38" (1/1) ... [2018-10-24 11:49:38,473 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:38" (1/1) ... [2018-10-24 11:49:38,475 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:38" (1/1) ... [2018-10-24 11:49:38,482 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:38" (1/1) ... [2018-10-24 11:49:38,483 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:38" (1/1) ... [2018-10-24 11:49:38,485 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 11:49:38,486 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 11:49:38,486 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 11:49:38,486 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 11:49:38,487 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:38" (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 11:49:38,644 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 11:49:38,644 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 11:49:38,909 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 11:49:38,910 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:49:38 BoogieIcfgContainer [2018-10-24 11:49:38,910 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 11:49:38,911 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 11:49:38,911 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 11:49:38,915 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 11:49:38,915 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 11:49:38" (1/3) ... [2018-10-24 11:49:38,916 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7cf2f003 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:49:38, skipping insertion in model container [2018-10-24 11:49:38,916 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:49:38" (2/3) ... [2018-10-24 11:49:38,917 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7cf2f003 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:49:38, skipping insertion in model container [2018-10-24 11:49:38,917 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:49:38" (3/3) ... [2018-10-24 11:49:38,919 INFO L112 eAbstractionObserver]: Analyzing ICFG const_false-unreach-call1.i [2018-10-24 11:49:38,929 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 11:49:38,937 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 11:49:38,954 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 11:49:38,984 INFO L135 ementStrategyFactory]: Using default assertion order modulation [2018-10-24 11:49:38,985 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 11:49:38,985 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 11:49:38,985 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 11:49:38,985 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 11:49:38,986 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 11:49:38,986 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 11:49:38,986 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 11:49:38,986 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 11:49:39,001 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states. [2018-10-24 11:49:39,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-24 11:49:39,008 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:39,009 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-10-24 11:49:39,011 INFO L424 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:39,018 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:39,018 INFO L82 PathProgramCache]: Analyzing trace with hash 889783783, now seen corresponding path program 1 times [2018-10-24 11:49:39,020 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:39,021 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:39,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:39,075 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:49:39,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:39,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:39,138 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 11:49:39,140 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 11:49:39,141 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 11:49:39,145 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 11:49:39,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 11:49:39,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 11:49:39,160 INFO L87 Difference]: Start difference. First operand 12 states. Second operand 2 states. [2018-10-24 11:49:39,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:39,177 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2018-10-24 11:49:39,177 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 11:49:39,179 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 6 [2018-10-24 11:49:39,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:39,189 INFO L225 Difference]: With dead ends: 20 [2018-10-24 11:49:39,190 INFO L226 Difference]: Without dead ends: 8 [2018-10-24 11:49:39,194 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 11:49:39,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-10-24 11:49:39,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-10-24 11:49:39,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-10-24 11:49:39,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-10-24 11:49:39,225 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2018-10-24 11:49:39,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:39,226 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-10-24 11:49:39,226 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 11:49:39,226 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-10-24 11:49:39,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-10-24 11:49:39,227 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:39,227 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:39,227 INFO L424 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:39,227 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:39,228 INFO L82 PathProgramCache]: Analyzing trace with hash 1805923659, now seen corresponding path program 1 times [2018-10-24 11:49:39,228 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:39,228 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:39,229 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:39,229 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:49:39,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:39,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:39,335 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 11:49:39,338 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 11:49:39,338 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 11:49:39,347 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 11:49:39,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 11:49:39,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 11:49:39,351 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 3 states. [2018-10-24 11:49:39,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:39,410 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2018-10-24 11:49:39,411 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 11:49:39,411 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 7 [2018-10-24 11:49:39,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:39,412 INFO L225 Difference]: With dead ends: 14 [2018-10-24 11:49:39,412 INFO L226 Difference]: Without dead ends: 10 [2018-10-24 11:49:39,413 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 11:49:39,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-10-24 11:49:39,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-10-24 11:49:39,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-10-24 11:49:39,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-10-24 11:49:39,422 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 7 [2018-10-24 11:49:39,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:39,422 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2018-10-24 11:49:39,422 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 11:49:39,423 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2018-10-24 11:49:39,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-10-24 11:49:39,423 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:39,423 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:39,427 INFO L424 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:39,427 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:39,427 INFO L82 PathProgramCache]: Analyzing trace with hash 373599493, now seen corresponding path program 1 times [2018-10-24 11:49:39,427 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:39,428 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:39,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:39,429 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:49:39,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:39,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:39,535 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 11:49:39,535 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:49:39,535 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 11:49:39,550 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:49:39,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:39,572 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:49:39,619 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 11:49:39,640 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:49:39,640 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-10-24 11:49:39,641 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 11:49:39,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 11:49:39,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-24 11:49:39,642 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 4 states. [2018-10-24 11:49:39,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:39,680 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-10-24 11:49:39,680 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 11:49:39,681 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2018-10-24 11:49:39,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:39,681 INFO L225 Difference]: With dead ends: 16 [2018-10-24 11:49:39,682 INFO L226 Difference]: Without dead ends: 12 [2018-10-24 11:49:39,682 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 1 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 11:49:39,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-24 11:49:39,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-24 11:49:39,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-24 11:49:39,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-24 11:49:39,686 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 9 [2018-10-24 11:49:39,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:39,686 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-24 11:49:39,687 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 11:49:39,687 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-24 11:49:39,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-24 11:49:39,687 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:39,688 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:39,688 INFO L424 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:39,688 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:39,689 INFO L82 PathProgramCache]: Analyzing trace with hash -1700389313, now seen corresponding path program 2 times [2018-10-24 11:49:39,689 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:39,689 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:39,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:39,690 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:49:39,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:39,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:39,831 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:39,831 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:49:39,832 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 11:49:39,842 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:49:39,865 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:49:39,866 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:49:39,867 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:49:39,886 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:39,912 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:49:39,912 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-24 11:49:39,912 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 11:49:39,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 11:49:39,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 11:49:39,913 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 5 states. [2018-10-24 11:49:39,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:39,980 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2018-10-24 11:49:39,982 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 11:49:39,982 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2018-10-24 11:49:39,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:39,983 INFO L225 Difference]: With dead ends: 18 [2018-10-24 11:49:39,983 INFO L226 Difference]: Without dead ends: 14 [2018-10-24 11:49:39,983 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 11:49:39,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-24 11:49:39,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-24 11:49:39,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-24 11:49:39,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-24 11:49:39,989 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-24 11:49:39,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:39,989 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-24 11:49:39,989 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 11:49:39,990 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-24 11:49:39,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 11:49:39,991 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:39,991 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:39,991 INFO L424 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:39,991 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:39,992 INFO L82 PathProgramCache]: Analyzing trace with hash -1938806535, now seen corresponding path program 3 times [2018-10-24 11:49:39,992 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:39,992 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:39,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:39,995 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:49:39,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:40,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:40,353 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:40,354 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:49:40,354 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 11:49:40,367 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:49:40,390 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 11:49:40,390 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:49:40,392 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:49:40,417 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:40,445 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:49:40,445 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-10-24 11:49:40,446 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 11:49:40,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 11:49:40,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-24 11:49:40,446 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2018-10-24 11:49:40,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:40,510 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2018-10-24 11:49:40,511 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 11:49:40,511 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2018-10-24 11:49:40,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:40,512 INFO L225 Difference]: With dead ends: 20 [2018-10-24 11:49:40,512 INFO L226 Difference]: Without dead ends: 16 [2018-10-24 11:49:40,512 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-24 11:49:40,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-24 11:49:40,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-24 11:49:40,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-24 11:49:40,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-24 11:49:40,517 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-24 11:49:40,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:40,517 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-24 11:49:40,517 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 11:49:40,517 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-24 11:49:40,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-24 11:49:40,518 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:40,518 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:40,518 INFO L424 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:40,519 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:40,519 INFO L82 PathProgramCache]: Analyzing trace with hash 870477107, now seen corresponding path program 4 times [2018-10-24 11:49:40,519 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:40,519 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:40,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:40,520 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:49:40,521 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:40,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:40,682 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:40,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:49:40,683 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 11:49:40,695 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:49:40,723 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:49:40,723 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:49:40,725 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:49:40,796 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:40,825 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:49:40,825 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-24 11:49:40,826 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 11:49:40,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 11:49:40,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-24 11:49:40,827 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 7 states. [2018-10-24 11:49:40,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:40,890 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-10-24 11:49:40,891 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 11:49:40,891 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-10-24 11:49:40,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:40,892 INFO L225 Difference]: With dead ends: 22 [2018-10-24 11:49:40,892 INFO L226 Difference]: Without dead ends: 18 [2018-10-24 11:49:40,893 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-24 11:49:40,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-24 11:49:40,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-24 11:49:40,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 11:49:40,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-24 11:49:40,898 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-24 11:49:40,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:40,898 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-24 11:49:40,898 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 11:49:40,898 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-24 11:49:40,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 11:49:40,899 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:40,899 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:40,900 INFO L424 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:40,900 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:40,900 INFO L82 PathProgramCache]: Analyzing trace with hash -942372115, now seen corresponding path program 5 times [2018-10-24 11:49:40,900 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:40,901 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:40,901 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:40,902 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:49:40,902 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:40,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:41,102 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:41,103 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:49:41,103 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 11:49:41,119 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-24 11:49:41,146 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-24 11:49:41,147 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:49:41,148 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:49:41,167 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:41,191 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:49:41,191 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-10-24 11:49:41,191 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 11:49:41,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 11:49:41,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-24 11:49:41,192 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 8 states. [2018-10-24 11:49:41,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:41,333 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-24 11:49:41,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 11:49:41,334 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2018-10-24 11:49:41,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:41,335 INFO L225 Difference]: With dead ends: 24 [2018-10-24 11:49:41,335 INFO L226 Difference]: Without dead ends: 20 [2018-10-24 11:49:41,337 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-24 11:49:41,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-24 11:49:41,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-24 11:49:41,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-24 11:49:41,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-24 11:49:41,343 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-24 11:49:41,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:41,343 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-24 11:49:41,344 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 11:49:41,344 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-24 11:49:41,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-24 11:49:41,345 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:41,345 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:41,345 INFO L424 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:41,346 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:41,347 INFO L82 PathProgramCache]: Analyzing trace with hash 666247719, now seen corresponding path program 6 times [2018-10-24 11:49:41,347 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:41,347 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:41,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:41,348 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:49:41,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:41,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:41,743 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:41,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:49:41,744 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 11:49:41,753 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-24 11:49:41,775 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-24 11:49:41,775 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:49:41,777 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:49:41,820 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:41,854 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:49:41,855 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-24 11:49:41,855 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 11:49:41,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 11:49:41,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-24 11:49:41,856 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2018-10-24 11:49:41,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:41,979 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2018-10-24 11:49:41,980 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 11:49:41,980 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2018-10-24 11:49:41,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:41,981 INFO L225 Difference]: With dead ends: 26 [2018-10-24 11:49:41,981 INFO L226 Difference]: Without dead ends: 22 [2018-10-24 11:49:41,982 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-24 11:49:41,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-24 11:49:41,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-24 11:49:41,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-24 11:49:41,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-24 11:49:41,986 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-24 11:49:41,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:41,986 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-24 11:49:41,986 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 11:49:41,986 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-24 11:49:41,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-24 11:49:41,987 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:41,987 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:41,987 INFO L424 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:41,988 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:41,988 INFO L82 PathProgramCache]: Analyzing trace with hash 361681633, now seen corresponding path program 7 times [2018-10-24 11:49:41,988 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:41,988 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:41,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:41,989 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:49:41,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:42,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:42,555 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:42,555 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:49:42,556 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 11:49:42,565 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:49:42,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:42,582 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:49:42,603 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:42,624 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:49:42,625 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-10-24 11:49:42,625 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 11:49:42,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 11:49:42,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-24 11:49:42,626 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 10 states. [2018-10-24 11:49:42,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:42,851 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-10-24 11:49:42,851 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 11:49:42,851 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 21 [2018-10-24 11:49:42,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:42,852 INFO L225 Difference]: With dead ends: 28 [2018-10-24 11:49:42,852 INFO L226 Difference]: Without dead ends: 24 [2018-10-24 11:49:42,853 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-24 11:49:42,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-24 11:49:42,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-24 11:49:42,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-24 11:49:42,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-24 11:49:42,857 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-24 11:49:42,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:42,858 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-24 11:49:42,858 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 11:49:42,858 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-24 11:49:42,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-24 11:49:42,859 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:42,859 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:42,859 INFO L424 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:42,860 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:42,860 INFO L82 PathProgramCache]: Analyzing trace with hash -268550885, now seen corresponding path program 8 times [2018-10-24 11:49:42,860 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:42,860 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:42,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:42,861 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:49:42,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:42,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:43,110 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:43,111 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:49:43,111 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 11:49:43,122 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:49:43,168 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:49:43,168 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:49:43,171 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:49:43,239 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:43,271 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:49:43,271 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-10-24 11:49:43,272 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 11:49:43,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 11:49:43,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-24 11:49:43,273 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 11 states. [2018-10-24 11:49:43,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:43,411 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-24 11:49:43,413 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 11:49:43,413 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 23 [2018-10-24 11:49:43,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:43,413 INFO L225 Difference]: With dead ends: 30 [2018-10-24 11:49:43,414 INFO L226 Difference]: Without dead ends: 26 [2018-10-24 11:49:43,414 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-24 11:49:43,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-24 11:49:43,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-24 11:49:43,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-24 11:49:43,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-24 11:49:43,418 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-10-24 11:49:43,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:43,419 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-24 11:49:43,419 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 11:49:43,419 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-24 11:49:43,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 11:49:43,420 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:43,420 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:43,420 INFO L424 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:43,420 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:43,421 INFO L82 PathProgramCache]: Analyzing trace with hash -331611947, now seen corresponding path program 9 times [2018-10-24 11:49:43,421 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:43,421 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:43,422 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:43,422 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:49:43,422 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:43,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:43,633 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:43,633 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:49:43,633 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 11:49:43,647 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:49:43,778 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 11:49:43,779 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:49:43,781 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:49:43,811 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:43,832 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:49:43,832 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-10-24 11:49:43,833 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 11:49:43,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 11:49:43,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-24 11:49:43,834 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 12 states. [2018-10-24 11:49:43,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:43,957 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-10-24 11:49:43,958 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 11:49:43,958 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2018-10-24 11:49:43,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:43,959 INFO L225 Difference]: With dead ends: 32 [2018-10-24 11:49:43,959 INFO L226 Difference]: Without dead ends: 28 [2018-10-24 11:49:43,960 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-24 11:49:43,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-24 11:49:43,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-24 11:49:43,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-24 11:49:43,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-24 11:49:43,965 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-10-24 11:49:43,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:43,965 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-24 11:49:43,965 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 11:49:43,965 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-24 11:49:43,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-24 11:49:43,966 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:43,966 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:43,966 INFO L424 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:43,966 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:43,967 INFO L82 PathProgramCache]: Analyzing trace with hash -803750385, now seen corresponding path program 10 times [2018-10-24 11:49:43,967 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:43,967 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:43,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:43,968 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:49:43,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:43,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:44,284 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:44,285 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:49:44,285 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 11:49:44,297 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:49:44,326 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:49:44,326 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:49:44,328 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:49:44,346 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:44,367 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:49:44,367 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-24 11:49:44,367 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 11:49:44,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 11:49:44,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-24 11:49:44,368 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 13 states. [2018-10-24 11:49:44,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:44,680 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-10-24 11:49:44,681 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 11:49:44,682 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 27 [2018-10-24 11:49:44,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:44,682 INFO L225 Difference]: With dead ends: 34 [2018-10-24 11:49:44,682 INFO L226 Difference]: Without dead ends: 30 [2018-10-24 11:49:44,683 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-24 11:49:44,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-24 11:49:44,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-24 11:49:44,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-24 11:49:44,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-24 11:49:44,687 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-10-24 11:49:44,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:44,688 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-24 11:49:44,688 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 11:49:44,688 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-24 11:49:44,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-24 11:49:44,689 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:44,689 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:44,689 INFO L424 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:44,690 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:44,690 INFO L82 PathProgramCache]: Analyzing trace with hash 737744073, now seen corresponding path program 11 times [2018-10-24 11:49:44,690 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:44,690 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:44,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:44,691 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:49:44,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:44,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:45,029 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:45,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:49:45,029 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 11:49:45,038 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-24 11:49:47,511 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-24 11:49:47,511 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:49:47,544 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:49:47,578 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:47,609 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:49:47,609 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-10-24 11:49:47,610 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 11:49:47,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 11:49:47,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-24 11:49:47,611 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 14 states. [2018-10-24 11:49:47,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:47,767 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-24 11:49:47,767 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 11:49:47,767 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 29 [2018-10-24 11:49:47,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:47,768 INFO L225 Difference]: With dead ends: 36 [2018-10-24 11:49:47,769 INFO L226 Difference]: Without dead ends: 32 [2018-10-24 11:49:47,770 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-24 11:49:47,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-24 11:49:47,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-24 11:49:47,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-24 11:49:47,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-24 11:49:47,775 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-10-24 11:49:47,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:47,775 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-24 11:49:47,775 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 11:49:47,775 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-24 11:49:47,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-24 11:49:47,776 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:47,776 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:47,777 INFO L424 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:47,777 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:47,777 INFO L82 PathProgramCache]: Analyzing trace with hash 350201091, now seen corresponding path program 12 times [2018-10-24 11:49:47,777 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:47,777 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:47,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:47,778 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:49:47,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:47,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:48,088 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:48,089 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:49:48,089 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 11:49:48,097 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-24 11:49:48,217 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-24 11:49:48,217 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:49:48,219 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:49:48,249 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:48,270 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:49:48,270 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-24 11:49:48,271 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 11:49:48,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 11:49:48,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-24 11:49:48,271 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 15 states. [2018-10-24 11:49:48,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:48,447 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-10-24 11:49:48,447 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 11:49:48,448 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 31 [2018-10-24 11:49:48,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:48,449 INFO L225 Difference]: With dead ends: 38 [2018-10-24 11:49:48,449 INFO L226 Difference]: Without dead ends: 34 [2018-10-24 11:49:48,450 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-24 11:49:48,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-24 11:49:48,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-24 11:49:48,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-24 11:49:48,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-24 11:49:48,455 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-10-24 11:49:48,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:48,455 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-24 11:49:48,455 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 11:49:48,456 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-24 11:49:48,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-24 11:49:48,456 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:48,457 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:48,457 INFO L424 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:48,457 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:48,457 INFO L82 PathProgramCache]: Analyzing trace with hash 1583550141, now seen corresponding path program 13 times [2018-10-24 11:49:48,457 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:48,458 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:48,458 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:48,459 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:49:48,459 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:48,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:48,956 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:48,956 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:49:48,957 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 11:49:48,965 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:49:48,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:48,982 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:49:49,003 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:49,036 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:49:49,036 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-10-24 11:49:49,037 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 11:49:49,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 11:49:49,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-24 11:49:49,038 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 16 states. [2018-10-24 11:49:49,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:49,412 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-10-24 11:49:49,413 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 11:49:49,413 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 33 [2018-10-24 11:49:49,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:49,414 INFO L225 Difference]: With dead ends: 40 [2018-10-24 11:49:49,414 INFO L226 Difference]: Without dead ends: 36 [2018-10-24 11:49:49,415 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 33 SyntacticMatches, 1 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 11:49:49,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-24 11:49:49,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-24 11:49:49,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-24 11:49:49,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-24 11:49:49,419 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-10-24 11:49:49,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:49,419 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-24 11:49:49,420 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 11:49:49,420 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-24 11:49:49,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-24 11:49:49,421 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:49,421 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:49,421 INFO L424 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:49,421 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:49,422 INFO L82 PathProgramCache]: Analyzing trace with hash 1421013495, now seen corresponding path program 14 times [2018-10-24 11:49:49,422 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:49,422 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:49,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:49,423 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:49:49,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:49,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:49,867 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:49,867 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:49:49,868 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 11:49:49,883 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:49:49,927 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:49:49,927 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:49:49,930 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:49:49,952 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:49,973 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:49:49,973 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-24 11:49:49,973 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 11:49:49,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 11:49:49,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-24 11:49:49,974 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 17 states. [2018-10-24 11:49:50,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:50,209 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-24 11:49:50,210 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 11:49:50,210 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 35 [2018-10-24 11:49:50,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:50,211 INFO L225 Difference]: With dead ends: 42 [2018-10-24 11:49:50,211 INFO L226 Difference]: Without dead ends: 38 [2018-10-24 11:49:50,211 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-24 11:49:50,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-24 11:49:50,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-24 11:49:50,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-24 11:49:50,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-24 11:49:50,216 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-10-24 11:49:50,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:50,216 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-24 11:49:50,216 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 11:49:50,217 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-24 11:49:50,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-24 11:49:50,217 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:50,218 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:50,218 INFO L424 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:50,218 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:50,218 INFO L82 PathProgramCache]: Analyzing trace with hash -157880655, now seen corresponding path program 15 times [2018-10-24 11:49:50,219 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:50,219 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:50,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:50,220 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:49:50,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:50,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:50,639 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:50,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:49:50,640 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 11:49:50,647 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:49:51,083 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-24 11:49:51,083 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:49:51,089 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:49:51,224 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:51,245 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:49:51,245 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-10-24 11:49:51,245 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 11:49:51,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 11:49:51,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-24 11:49:51,246 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 18 states. [2018-10-24 11:49:51,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:51,454 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-10-24 11:49:51,454 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 11:49:51,454 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 37 [2018-10-24 11:49:51,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:51,455 INFO L225 Difference]: With dead ends: 44 [2018-10-24 11:49:51,455 INFO L226 Difference]: Without dead ends: 40 [2018-10-24 11:49:51,456 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-24 11:49:51,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-24 11:49:51,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-10-24 11:49:51,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-24 11:49:51,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-10-24 11:49:51,462 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-10-24 11:49:51,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:51,462 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-10-24 11:49:51,462 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 11:49:51,462 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-10-24 11:49:51,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-24 11:49:51,463 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:51,463 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:51,463 INFO L424 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:51,464 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:51,464 INFO L82 PathProgramCache]: Analyzing trace with hash -1351703317, now seen corresponding path program 16 times [2018-10-24 11:49:51,464 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:51,464 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:51,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:51,465 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:49:51,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:51,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:52,133 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:52,133 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:49:52,134 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 11:49:52,141 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:49:52,171 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:49:52,171 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:49:52,173 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:49:52,194 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:52,221 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:49:52,221 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-10-24 11:49:52,221 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 11:49:52,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 11:49:52,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-24 11:49:52,222 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 19 states. [2018-10-24 11:49:52,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:49:52,704 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-10-24 11:49:52,704 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 11:49:52,705 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 39 [2018-10-24 11:49:52,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:49:52,705 INFO L225 Difference]: With dead ends: 46 [2018-10-24 11:49:52,706 INFO L226 Difference]: Without dead ends: 42 [2018-10-24 11:49:52,706 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-24 11:49:52,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-24 11:49:52,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-24 11:49:52,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-24 11:49:52,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-24 11:49:52,711 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-10-24 11:49:52,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:49:52,712 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-24 11:49:52,712 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 11:49:52,712 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-24 11:49:52,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-24 11:49:52,712 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:49:52,713 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1] [2018-10-24 11:49:52,713 INFO L424 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:49:52,713 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:49:52,713 INFO L82 PathProgramCache]: Analyzing trace with hash -1859013467, now seen corresponding path program 17 times [2018-10-24 11:49:52,713 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:49:52,713 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:49:52,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:52,714 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:49:52,715 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:49:52,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:49:53,060 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:49:53,060 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:49:53,060 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 11:49:53,068 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-24 11:50:28,393 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-24 11:50:28,393 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:28,417 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:28,456 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:28,480 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:28,481 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 20 [2018-10-24 11:50:28,481 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 11:50:28,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 11:50:28,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-24 11:50:28,482 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 20 states. [2018-10-24 11:50:29,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:29,198 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-24 11:50:29,198 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 11:50:29,199 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 41 [2018-10-24 11:50:29,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:29,200 INFO L225 Difference]: With dead ends: 48 [2018-10-24 11:50:29,200 INFO L226 Difference]: Without dead ends: 44 [2018-10-24 11:50:29,201 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-24 11:50:29,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-10-24 11:50:29,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-10-24 11:50:29,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-24 11:50:29,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-24 11:50:29,206 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-10-24 11:50:29,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:29,206 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-24 11:50:29,206 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 11:50:29,206 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-24 11:50:29,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-24 11:50:29,207 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:29,207 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:29,208 INFO L424 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:29,208 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:29,208 INFO L82 PathProgramCache]: Analyzing trace with hash 242204127, now seen corresponding path program 18 times [2018-10-24 11:50:29,208 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:29,208 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:29,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:29,209 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:29,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:29,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:29,888 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:29,888 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:29,888 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 11:50:29,895 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-24 11:50:30,322 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-10-24 11:50:30,323 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:30,327 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:30,363 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:30,393 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:30,393 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 21 [2018-10-24 11:50:30,393 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 11:50:30,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 11:50:30,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-10-24 11:50:30,394 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 21 states. [2018-10-24 11:50:30,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:30,727 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2018-10-24 11:50:30,727 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 11:50:30,727 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2018-10-24 11:50:30,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:30,728 INFO L225 Difference]: With dead ends: 50 [2018-10-24 11:50:30,728 INFO L226 Difference]: Without dead ends: 46 [2018-10-24 11:50:30,729 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 43 SyntacticMatches, 1 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 11:50:30,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-24 11:50:30,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-10-24 11:50:30,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-24 11:50:30,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-10-24 11:50:30,735 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 43 [2018-10-24 11:50:30,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:30,735 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-10-24 11:50:30,736 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 11:50:30,736 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-10-24 11:50:30,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-24 11:50:30,736 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:30,736 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:30,737 INFO L424 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:30,737 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:30,737 INFO L82 PathProgramCache]: Analyzing trace with hash 877682841, now seen corresponding path program 19 times [2018-10-24 11:50:30,737 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:30,737 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:30,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:30,738 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:30,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:30,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:31,075 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:31,075 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:31,075 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 11:50:31,082 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:50:31,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:31,102 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:31,134 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:31,155 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:31,156 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 22 [2018-10-24 11:50:31,156 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 11:50:31,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 11:50:31,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-10-24 11:50:31,157 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 22 states. [2018-10-24 11:50:31,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:31,606 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2018-10-24 11:50:31,607 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 11:50:31,607 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 45 [2018-10-24 11:50:31,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:31,608 INFO L225 Difference]: With dead ends: 52 [2018-10-24 11:50:31,608 INFO L226 Difference]: Without dead ends: 48 [2018-10-24 11:50:31,609 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-10-24 11:50:31,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-24 11:50:31,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-24 11:50:31,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-24 11:50:31,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-24 11:50:31,616 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 45 [2018-10-24 11:50:31,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:31,616 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-24 11:50:31,616 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 11:50:31,617 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-24 11:50:31,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-24 11:50:31,617 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:31,617 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:31,618 INFO L424 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:31,618 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:31,618 INFO L82 PathProgramCache]: Analyzing trace with hash 1687370963, now seen corresponding path program 20 times [2018-10-24 11:50:31,618 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:31,618 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:31,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:31,619 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:50:31,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:31,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:32,079 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:32,080 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:32,080 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 11:50:32,092 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:50:32,115 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:50:32,115 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:32,117 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:32,140 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:32,162 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:32,162 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 23 [2018-10-24 11:50:32,162 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 11:50:32,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 11:50:32,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-10-24 11:50:32,163 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 23 states. [2018-10-24 11:50:32,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:32,503 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-24 11:50:32,504 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 11:50:32,504 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 47 [2018-10-24 11:50:32,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:32,505 INFO L225 Difference]: With dead ends: 54 [2018-10-24 11:50:32,505 INFO L226 Difference]: Without dead ends: 50 [2018-10-24 11:50:32,506 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-10-24 11:50:32,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-10-24 11:50:32,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-10-24 11:50:32,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-24 11:50:32,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-24 11:50:32,510 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 47 [2018-10-24 11:50:32,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:32,511 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-24 11:50:32,511 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 11:50:32,511 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-24 11:50:32,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 11:50:32,511 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:32,511 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:32,511 INFO L424 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:32,512 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:32,512 INFO L82 PathProgramCache]: Analyzing trace with hash -1886391667, now seen corresponding path program 21 times [2018-10-24 11:50:32,512 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:32,512 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:32,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:32,512 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:32,513 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:32,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:33,608 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:33,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:33,608 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:50:33,616 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:50:36,514 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-10-24 11:50:36,514 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:36,598 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:36,624 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:36,644 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:36,644 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 24 [2018-10-24 11:50:36,644 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 11:50:36,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 11:50:36,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-10-24 11:50:36,645 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 24 states. [2018-10-24 11:50:37,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:37,076 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2018-10-24 11:50:37,076 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 11:50:37,077 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 49 [2018-10-24 11:50:37,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:37,078 INFO L225 Difference]: With dead ends: 56 [2018-10-24 11:50:37,078 INFO L226 Difference]: Without dead ends: 52 [2018-10-24 11:50:37,079 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-10-24 11:50:37,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-24 11:50:37,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-10-24 11:50:37,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-24 11:50:37,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-10-24 11:50:37,084 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 49 [2018-10-24 11:50:37,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:37,084 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-10-24 11:50:37,084 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 11:50:37,084 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-10-24 11:50:37,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-24 11:50:37,085 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:37,085 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:37,085 INFO L424 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:37,086 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:37,086 INFO L82 PathProgramCache]: Analyzing trace with hash -298442297, now seen corresponding path program 22 times [2018-10-24 11:50:37,086 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:37,086 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:37,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:37,087 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:37,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:37,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:37,597 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:37,597 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:37,597 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:50:37,606 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:50:37,626 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:50:37,626 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:37,628 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:37,667 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:37,691 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:37,691 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 25 [2018-10-24 11:50:37,692 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 11:50:37,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 11:50:37,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-10-24 11:50:37,693 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 25 states. [2018-10-24 11:50:38,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:38,142 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2018-10-24 11:50:38,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 11:50:38,143 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 51 [2018-10-24 11:50:38,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:38,143 INFO L225 Difference]: With dead ends: 58 [2018-10-24 11:50:38,144 INFO L226 Difference]: Without dead ends: 54 [2018-10-24 11:50:38,144 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 51 SyntacticMatches, 1 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 11:50:38,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-24 11:50:38,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-10-24 11:50:38,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-24 11:50:38,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-24 11:50:38,148 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 51 [2018-10-24 11:50:38,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:38,149 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-24 11:50:38,149 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 11:50:38,149 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-24 11:50:38,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-24 11:50:38,149 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:38,149 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:38,149 INFO L424 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:38,150 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:38,150 INFO L82 PathProgramCache]: Analyzing trace with hash 1007512193, now seen corresponding path program 23 times [2018-10-24 11:50:38,150 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:38,150 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:38,150 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:38,151 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:38,151 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:38,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:38,739 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:38,739 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:38,740 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:50:38,746 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-24 11:52:57,385 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2018-10-24 11:52:57,385 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:52:57,416 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:52:57,447 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:52:57,453 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:52:57,453 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 26 [2018-10-24 11:52:57,453 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 11:52:57,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 11:52:57,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2018-10-24 11:52:57,454 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 26 states. [2018-10-24 11:52:57,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:52:57,928 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-24 11:52:57,929 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 11:52:57,929 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 53 [2018-10-24 11:52:57,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:52:57,930 INFO L225 Difference]: With dead ends: 60 [2018-10-24 11:52:57,930 INFO L226 Difference]: Without dead ends: 56 [2018-10-24 11:52:57,931 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2018-10-24 11:52:57,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-10-24 11:52:57,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2018-10-24 11:52:57,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-24 11:52:57,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-10-24 11:52:57,937 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 53 [2018-10-24 11:52:57,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:52:57,937 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-10-24 11:52:57,937 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 11:52:57,937 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-10-24 11:52:57,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-24 11:52:57,938 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:52:57,938 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 1, 1, 1, 1, 1, 1] [2018-10-24 11:52:57,938 INFO L424 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:52:57,939 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:52:57,939 INFO L82 PathProgramCache]: Analyzing trace with hash 1899326651, now seen corresponding path program 24 times [2018-10-24 11:52:57,939 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:52:57,939 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:52:57,939 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:52:57,940 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:52:57,940 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:52:57,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:52:58,460 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:52:58,460 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:52:58,460 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:52:58,470 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-24 11:53:39,320 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2018-10-24 11:53:39,321 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:53:39,356 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:53:39,431 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:53:39,459 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:53:39,459 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 27 [2018-10-24 11:53:39,459 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 11:53:39,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 11:53:39,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2018-10-24 11:53:39,460 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 27 states. [2018-10-24 11:53:39,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:53:39,898 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2018-10-24 11:53:39,898 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 11:53:39,898 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 55 [2018-10-24 11:53:39,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:53:39,899 INFO L225 Difference]: With dead ends: 62 [2018-10-24 11:53:39,899 INFO L226 Difference]: Without dead ends: 58 [2018-10-24 11:53:39,900 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2018-10-24 11:53:39,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-24 11:53:39,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-10-24 11:53:39,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-24 11:53:39,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2018-10-24 11:53:39,905 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 55 [2018-10-24 11:53:39,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:53:39,905 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2018-10-24 11:53:39,905 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 11:53:39,905 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2018-10-24 11:53:39,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-24 11:53:39,905 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:53:39,906 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 1, 1, 1, 1, 1, 1] [2018-10-24 11:53:39,906 INFO L424 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:53:39,906 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:53:39,906 INFO L82 PathProgramCache]: Analyzing trace with hash -60438411, now seen corresponding path program 25 times [2018-10-24 11:53:39,906 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:53:39,906 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:53:39,907 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:53:39,907 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:53:39,907 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:53:39,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:53:40,569 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:53:40,570 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:53:40,570 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:53:40,577 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:53:40,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:53:40,604 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:53:40,624 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:53:40,643 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:53:40,644 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 28 [2018-10-24 11:53:40,644 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 11:53:40,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 11:53:40,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2018-10-24 11:53:40,645 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 28 states. [2018-10-24 11:53:41,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:53:41,178 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2018-10-24 11:53:41,179 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 11:53:41,179 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 57 [2018-10-24 11:53:41,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:53:41,180 INFO L225 Difference]: With dead ends: 64 [2018-10-24 11:53:41,180 INFO L226 Difference]: Without dead ends: 60 [2018-10-24 11:53:41,181 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2018-10-24 11:53:41,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-24 11:53:41,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-10-24 11:53:41,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-24 11:53:41,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-10-24 11:53:41,185 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 57 [2018-10-24 11:53:41,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:53:41,185 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-10-24 11:53:41,185 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 11:53:41,185 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-10-24 11:53:41,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 11:53:41,186 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:53:41,186 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 1, 1, 1, 1, 1, 1] [2018-10-24 11:53:41,186 INFO L424 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:53:41,186 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:53:41,187 INFO L82 PathProgramCache]: Analyzing trace with hash 2095979951, now seen corresponding path program 26 times [2018-10-24 11:53:41,187 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:53:41,187 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:53:41,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:53:41,188 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:53:41,188 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:53:41,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:53:42,627 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:53:42,627 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:53:42,627 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:53:42,634 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:53:42,661 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:53:42,662 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:53:42,663 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:53:42,696 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:53:42,726 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:53:42,726 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 29 [2018-10-24 11:53:42,726 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 11:53:42,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 11:53:42,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2018-10-24 11:53:42,727 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 29 states. [2018-10-24 11:53:43,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:53:43,310 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-24 11:53:43,310 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 11:53:43,310 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 59 [2018-10-24 11:53:43,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:53:43,311 INFO L225 Difference]: With dead ends: 66 [2018-10-24 11:53:43,312 INFO L226 Difference]: Without dead ends: 62 [2018-10-24 11:53:43,312 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2018-10-24 11:53:43,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-10-24 11:53:43,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2018-10-24 11:53:43,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-10-24 11:53:43,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2018-10-24 11:53:43,319 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 59 [2018-10-24 11:53:43,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:53:43,320 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2018-10-24 11:53:43,320 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 11:53:43,320 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2018-10-24 11:53:43,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-24 11:53:43,321 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:53:43,321 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 1, 1, 1, 1, 1, 1] [2018-10-24 11:53:43,321 INFO L424 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:53:43,321 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:53:43,321 INFO L82 PathProgramCache]: Analyzing trace with hash -55178135, now seen corresponding path program 27 times [2018-10-24 11:53:43,321 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:53:43,322 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:53:43,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:53:43,322 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:53:43,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:53:43,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:53:43,987 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:53:43,988 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:53:43,988 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:53:44,006 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:53:52,810 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-10-24 11:53:52,810 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:53:52,861 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:53:52,912 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:53:52,947 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:53:52,947 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 30 [2018-10-24 11:53:52,947 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 11:53:52,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 11:53:52,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2018-10-24 11:53:52,948 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand 30 states. [2018-10-24 11:53:53,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:53:53,603 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2018-10-24 11:53:53,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-24 11:53:53,603 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 61 [2018-10-24 11:53:53,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:53:53,604 INFO L225 Difference]: With dead ends: 68 [2018-10-24 11:53:53,604 INFO L226 Difference]: Without dead ends: 64 [2018-10-24 11:53:53,605 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2018-10-24 11:53:53,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-24 11:53:53,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2018-10-24 11:53:53,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-10-24 11:53:53,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 64 transitions. [2018-10-24 11:53:53,610 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 64 transitions. Word has length 61 [2018-10-24 11:53:53,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:53:53,610 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 64 transitions. [2018-10-24 11:53:53,610 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 11:53:53,611 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 64 transitions. [2018-10-24 11:53:53,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-10-24 11:53:53,611 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:53:53,611 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 1, 1, 1, 1, 1, 1] [2018-10-24 11:53:53,612 INFO L424 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:53:53,612 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:53:53,612 INFO L82 PathProgramCache]: Analyzing trace with hash -1438829405, now seen corresponding path program 28 times [2018-10-24 11:53:53,612 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:53:53,612 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:53:53,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:53:53,613 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:53:53,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:53:53,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:53:54,851 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:53:54,851 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:53:54,851 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:53:54,859 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:53:54,888 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:53:54,888 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:53:54,890 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:53:54,924 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:53:54,946 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:53:54,946 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 31 [2018-10-24 11:53:54,947 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 11:53:54,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 11:53:54,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2018-10-24 11:53:54,947 INFO L87 Difference]: Start difference. First operand 64 states and 64 transitions. Second operand 31 states. [2018-10-24 11:53:55,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:53:55,526 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2018-10-24 11:53:55,527 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 11:53:55,527 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 63 [2018-10-24 11:53:55,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:53:55,528 INFO L225 Difference]: With dead ends: 70 [2018-10-24 11:53:55,528 INFO L226 Difference]: Without dead ends: 66 [2018-10-24 11:53:55,529 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2018-10-24 11:53:55,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-24 11:53:55,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-10-24 11:53:55,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-24 11:53:55,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-10-24 11:53:55,532 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 63 [2018-10-24 11:53:55,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:53:55,532 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-10-24 11:53:55,532 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 11:53:55,533 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-10-24 11:53:55,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-24 11:53:55,533 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:53:55,533 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 1, 1, 1, 1, 1, 1] [2018-10-24 11:53:55,533 INFO L424 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:53:55,534 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:53:55,534 INFO L82 PathProgramCache]: Analyzing trace with hash 312161885, now seen corresponding path program 29 times [2018-10-24 11:53:55,534 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:53:55,534 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:53:55,534 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:53:55,535 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:53:55,535 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:53:55,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:53:56,139 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:53:56,139 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:53:56,140 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:53:56,147 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown