java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data --generate-csv --csv-dir csv -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/nested1.i_4.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-9f4048f [2018-10-04 12:26:14,711 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-04 12:26:14,713 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-04 12:26:14,728 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2018-10-04 12:26:14,774 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf [2018-10-04 12:26:14,796 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-04 12:26:14,797 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-04 12:26:14,797 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-04 12:26:14,798 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-04 12:26:14,798 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-04 12:26:14,798 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-04 12:26:14,798 INFO L133 SettingsManager]: * Use SBE=true [2018-10-04 12:26:14,799 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-04 12:26:14,799 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-04 12:26:14,799 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-04 12:26:14,799 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-04 12:26:14,799 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-04 12:26:14,800 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-04 12:26:14,800 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-04 12:26:14,800 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-04 12:26:14,800 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-04 12:26:14,800 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-04 12:26:14,801 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-04 12:26:14,801 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-04 12:26:14,801 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-04 12:26:14,801 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-04 12:26:14,801 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-04 12:26:14,802 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-04 12:26:14,802 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-04 12:26:14,802 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-04 12:26:14,802 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-04 12:26:14,802 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-04 12:26:14,803 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-04 12:26:14,803 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-04 12:26:14,803 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-04 12:26:14,864 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-04 12:26:14,878 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-04 12:26:14,883 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-04 12:26:14,885 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-10-04 12:26:14,886 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-10-04 12:26:14,886 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/nested1.i_4.bpl [2018-10-04 12:26:14,887 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/nested1.i_4.bpl' [2018-10-04 12:26:14,944 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-04 12:26:14,946 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-10-04 12:26:14,947 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-04 12:26:14,947 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-04 12:26:14,947 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-04 12:26:14,966 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:26:14" (1/1) ... [2018-10-04 12:26:14,978 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:26:14" (1/1) ... [2018-10-04 12:26:14,985 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-04 12:26:14,985 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-04 12:26:14,986 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-04 12:26:14,986 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-04 12:26:14,997 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:26:14" (1/1) ... [2018-10-04 12:26:14,997 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:26:14" (1/1) ... [2018-10-04 12:26:14,998 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:26:14" (1/1) ... [2018-10-04 12:26:14,998 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:26:14" (1/1) ... [2018-10-04 12:26:15,002 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:26:14" (1/1) ... [2018-10-04 12:26:15,005 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:26:14" (1/1) ... [2018-10-04 12:26:15,006 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:26:14" (1/1) ... [2018-10-04 12:26:15,008 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-04 12:26:15,008 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-04 12:26:15,008 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-04 12:26:15,009 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-04 12:26:15,009 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:26:14" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-04 12:26:15,080 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-04 12:26:15,080 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-04 12:26:15,340 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-04 12:26:15,341 INFO L202 PluginConnector]: Adding new model nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.10 12:26:15 BoogieIcfgContainer [2018-10-04 12:26:15,341 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-04 12:26:15,342 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-04 12:26:15,342 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-04 12:26:15,345 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-04 12:26:15,346 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:26:14" (1/2) ... [2018-10-04 12:26:15,347 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@49d47ffe and model type nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.10 12:26:15, skipping insertion in model container [2018-10-04 12:26:15,347 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.10 12:26:15" (2/2) ... [2018-10-04 12:26:15,349 INFO L112 eAbstractionObserver]: Analyzing ICFG nested1.i_4.bpl [2018-10-04 12:26:15,359 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-04 12:26:15,367 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-04 12:26:15,421 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-04 12:26:15,421 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-10-04 12:26:15,422 INFO L382 AbstractCegarLoop]: Hoare is true [2018-10-04 12:26:15,422 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-04 12:26:15,422 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-04 12:26:15,422 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-04 12:26:15,422 INFO L386 AbstractCegarLoop]: Difference is false [2018-10-04 12:26:15,423 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-04 12:26:15,423 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-04 12:26:15,441 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-10-04 12:26:15,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-10-04 12:26:15,461 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:26:15,463 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-10-04 12:26:15,464 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:26:15,473 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:26:15,473 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2018-10-04 12:26:15,475 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:26:15,476 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:26:15,531 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:15,532 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:26:15,532 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:15,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:15,670 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:26:15,672 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-04 12:26:15,673 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-04 12:26:15,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-04 12:26:15,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-04 12:26:15,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-04 12:26:15,690 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-10-04 12:26:15,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:26:15,775 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2018-10-04 12:26:15,776 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-04 12:26:15,777 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-10-04 12:26:15,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:26:15,787 INFO L225 Difference]: With dead ends: 17 [2018-10-04 12:26:15,787 INFO L226 Difference]: Without dead ends: 11 [2018-10-04 12:26:15,792 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-04 12:26:15,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-10-04 12:26:15,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 9. [2018-10-04 12:26:15,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-10-04 12:26:15,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2018-10-04 12:26:15,829 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 4 [2018-10-04 12:26:15,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:26:15,829 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2018-10-04 12:26:15,829 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-04 12:26:15,829 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2018-10-04 12:26:15,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-10-04 12:26:15,830 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:26:15,830 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2018-10-04 12:26:15,830 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:26:15,831 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:26:15,831 INFO L82 PathProgramCache]: Analyzing trace with hash 209100445, now seen corresponding path program 1 times [2018-10-04 12:26:15,831 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:26:15,831 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:26:15,832 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:15,832 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:26:15,832 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:15,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:15,934 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:26:15,934 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-04 12:26:15,934 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-04 12:26:15,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-04 12:26:15,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-04 12:26:15,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-04 12:26:15,938 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 3 states. [2018-10-04 12:26:16,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:26:16,005 INFO L93 Difference]: Finished difference Result 17 states and 20 transitions. [2018-10-04 12:26:16,005 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-04 12:26:16,005 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2018-10-04 12:26:16,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:26:16,006 INFO L225 Difference]: With dead ends: 17 [2018-10-04 12:26:16,006 INFO L226 Difference]: Without dead ends: 11 [2018-10-04 12:26:16,007 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 [2018-10-04 12:26:16,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-10-04 12:26:16,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-10-04 12:26:16,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-10-04 12:26:16,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2018-10-04 12:26:16,011 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2018-10-04 12:26:16,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:26:16,012 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2018-10-04 12:26:16,012 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-04 12:26:16,012 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2018-10-04 12:26:16,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-04 12:26:16,013 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:26:16,013 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2018-10-04 12:26:16,013 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:26:16,013 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:26:16,014 INFO L82 PathProgramCache]: Analyzing trace with hash -850198025, now seen corresponding path program 1 times [2018-10-04 12:26:16,014 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:26:16,014 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:26:16,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:16,015 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:26:16,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:16,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:16,145 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:26:16,146 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:26:16,146 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:26:16,166 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:26:16,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:16,200 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:26:16,315 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:26:16,335 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:26:16,336 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 7 [2018-10-04 12:26:16,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-04 12:26:16,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-04 12:26:16,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-10-04 12:26:16,337 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 7 states. [2018-10-04 12:26:16,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:26:16,787 INFO L93 Difference]: Finished difference Result 35 states and 43 transitions. [2018-10-04 12:26:16,788 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-04 12:26:16,788 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 10 [2018-10-04 12:26:16,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:26:16,789 INFO L225 Difference]: With dead ends: 35 [2018-10-04 12:26:16,789 INFO L226 Difference]: Without dead ends: 27 [2018-10-04 12:26:16,790 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2018-10-04 12:26:16,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-04 12:26:16,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 21. [2018-10-04 12:26:16,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-04 12:26:16,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2018-10-04 12:26:16,799 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 10 [2018-10-04 12:26:16,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:26:16,799 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2018-10-04 12:26:16,799 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-04 12:26:16,799 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2018-10-04 12:26:16,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-04 12:26:16,800 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:26:16,800 INFO L375 BasicCegarLoop]: trace histogram [6, 4, 3, 2, 2, 1, 1, 1] [2018-10-04 12:26:16,801 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:26:16,801 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:26:16,801 INFO L82 PathProgramCache]: Analyzing trace with hash 1881088987, now seen corresponding path program 2 times [2018-10-04 12:26:16,802 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:26:16,802 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:26:16,803 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:16,803 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:26:16,803 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:16,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:16,943 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-10-04 12:26:16,943 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:26:16,946 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:26:16,956 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-04 12:26:16,977 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-04 12:26:16,977 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:26:16,980 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:26:17,045 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-04 12:26:17,074 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:26:17,074 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 8 [2018-10-04 12:26:17,074 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-04 12:26:17,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-04 12:26:17,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-04 12:26:17,076 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 8 states. [2018-10-04 12:26:17,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:26:17,805 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2018-10-04 12:26:17,808 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-04 12:26:17,808 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2018-10-04 12:26:17,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:26:17,810 INFO L225 Difference]: With dead ends: 55 [2018-10-04 12:26:17,810 INFO L226 Difference]: Without dead ends: 43 [2018-10-04 12:26:17,811 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2018-10-04 12:26:17,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-04 12:26:17,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 35. [2018-10-04 12:26:17,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-04 12:26:17,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2018-10-04 12:26:17,834 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 20 [2018-10-04 12:26:17,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:26:17,834 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2018-10-04 12:26:17,835 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-04 12:26:17,835 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2018-10-04 12:26:17,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-04 12:26:17,836 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:26:17,836 INFO L375 BasicCegarLoop]: trace histogram [12, 9, 4, 3, 3, 1, 1, 1] [2018-10-04 12:26:17,836 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:26:17,837 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:26:17,839 INFO L82 PathProgramCache]: Analyzing trace with hash 501354739, now seen corresponding path program 3 times [2018-10-04 12:26:17,839 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:26:17,839 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:26:17,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:17,841 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:26:17,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:17,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:18,028 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 70 proven. 12 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2018-10-04 12:26:18,028 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:26:18,028 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:26:18,036 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-04 12:26:18,056 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-04 12:26:18,056 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:26:18,059 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:26:18,108 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 70 proven. 12 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2018-10-04 12:26:18,141 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:26:18,142 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-10-04 12:26:18,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-04 12:26:18,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-04 12:26:18,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-04 12:26:18,143 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand 6 states. [2018-10-04 12:26:18,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:26:18,425 INFO L93 Difference]: Finished difference Result 65 states and 73 transitions. [2018-10-04 12:26:18,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-04 12:26:18,426 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 34 [2018-10-04 12:26:18,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:26:18,427 INFO L225 Difference]: With dead ends: 65 [2018-10-04 12:26:18,427 INFO L226 Difference]: Without dead ends: 41 [2018-10-04 12:26:18,427 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-04 12:26:18,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-10-04 12:26:18,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-10-04 12:26:18,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-04 12:26:18,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-10-04 12:26:18,439 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 34 [2018-10-04 12:26:18,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:26:18,440 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-10-04 12:26:18,441 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-04 12:26:18,441 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-10-04 12:26:18,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-04 12:26:18,443 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:26:18,443 INFO L375 BasicCegarLoop]: trace histogram [15, 12, 4, 3, 3, 1, 1, 1] [2018-10-04 12:26:18,443 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:26:18,443 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:26:18,444 INFO L82 PathProgramCache]: Analyzing trace with hash 209827969, now seen corresponding path program 4 times [2018-10-04 12:26:18,444 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:26:18,444 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:26:18,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:18,445 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:26:18,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:18,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:18,711 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-04 12:26:18,711 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:26:18,711 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:26:18,725 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-04 12:26:18,760 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-04 12:26:18,760 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:26:18,763 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:26:18,949 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-04 12:26:18,981 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:26:18,981 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 9] total 9 [2018-10-04 12:26:18,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-04 12:26:18,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-04 12:26:18,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2018-10-04 12:26:18,983 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 10 states. [2018-10-04 12:26:19,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:26:19,177 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2018-10-04 12:26:19,177 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-04 12:26:19,177 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 40 [2018-10-04 12:26:19,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:26:19,179 INFO L225 Difference]: With dead ends: 65 [2018-10-04 12:26:19,179 INFO L226 Difference]: Without dead ends: 63 [2018-10-04 12:26:19,179 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2018-10-04 12:26:19,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-04 12:26:19,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 53. [2018-10-04 12:26:19,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-04 12:26:19,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2018-10-04 12:26:19,192 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 40 [2018-10-04 12:26:19,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:26:19,193 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2018-10-04 12:26:19,193 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-04 12:26:19,193 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2018-10-04 12:26:19,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-04 12:26:19,195 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:26:19,195 INFO L375 BasicCegarLoop]: trace histogram [20, 16, 5, 4, 4, 1, 1, 1] [2018-10-04 12:26:19,195 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:26:19,196 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:26:19,196 INFO L82 PathProgramCache]: Analyzing trace with hash -1874565441, now seen corresponding path program 5 times [2018-10-04 12:26:19,196 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:26:19,196 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:26:19,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:19,197 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:26:19,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:19,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:19,459 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 320 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2018-10-04 12:26:19,460 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:26:19,460 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-10-04 12:26:19,477 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:26:19,497 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-04 12:26:19,497 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:26:19,500 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:26:19,626 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 262 proven. 20 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2018-10-04 12:26:19,647 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:26:19,647 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2018-10-04 12:26:19,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-04 12:26:19,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-04 12:26:19,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-04 12:26:19,649 INFO L87 Difference]: Start difference. First operand 53 states and 57 transitions. Second operand 12 states. [2018-10-04 12:26:20,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:26:20,775 INFO L93 Difference]: Finished difference Result 127 states and 143 transitions. [2018-10-04 12:26:20,775 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-04 12:26:20,775 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 52 [2018-10-04 12:26:20,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:26:20,776 INFO L225 Difference]: With dead ends: 127 [2018-10-04 12:26:20,776 INFO L226 Difference]: Without dead ends: 87 [2018-10-04 12:26:20,778 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=121, Invalid=1211, Unknown=0, NotChecked=0, Total=1332 [2018-10-04 12:26:20,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-04 12:26:20,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 75. [2018-10-04 12:26:20,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-04 12:26:20,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 80 transitions. [2018-10-04 12:26:20,794 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 80 transitions. Word has length 52 [2018-10-04 12:26:20,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:26:20,794 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 80 transitions. [2018-10-04 12:26:20,794 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-04 12:26:20,795 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 80 transitions. [2018-10-04 12:26:20,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-04 12:26:20,797 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:26:20,797 INFO L375 BasicCegarLoop]: trace histogram [30, 25, 6, 5, 5, 1, 1, 1] [2018-10-04 12:26:20,797 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:26:20,797 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:26:20,798 INFO L82 PathProgramCache]: Analyzing trace with hash -1734028097, now seen corresponding path program 6 times [2018-10-04 12:26:20,798 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:26:20,798 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:26:20,799 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:20,799 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:26:20,799 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:20,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:20,978 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 750 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2018-10-04 12:26:20,979 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:26:20,979 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:26:20,989 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-04 12:26:21,084 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2018-10-04 12:26:21,085 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:26:21,088 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:26:21,426 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 520 proven. 30 refuted. 0 times theorem prover too weak. 350 trivial. 0 not checked. [2018-10-04 12:26:21,446 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:26:21,446 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2018-10-04 12:26:21,447 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-04 12:26:21,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-04 12:26:21,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-04 12:26:21,448 INFO L87 Difference]: Start difference. First operand 75 states and 80 transitions. Second operand 14 states. [2018-10-04 12:26:23,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:26:23,068 INFO L93 Difference]: Finished difference Result 175 states and 194 transitions. [2018-10-04 12:26:23,068 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-04 12:26:23,069 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 74 [2018-10-04 12:26:23,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:26:23,070 INFO L225 Difference]: With dead ends: 175 [2018-10-04 12:26:23,070 INFO L226 Difference]: Without dead ends: 115 [2018-10-04 12:26:23,074 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 630 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=169, Invalid=2281, Unknown=0, NotChecked=0, Total=2450 [2018-10-04 12:26:23,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-04 12:26:23,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 101. [2018-10-04 12:26:23,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-10-04 12:26:23,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 107 transitions. [2018-10-04 12:26:23,102 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 107 transitions. Word has length 74 [2018-10-04 12:26:23,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:26:23,103 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 107 transitions. [2018-10-04 12:26:23,103 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-04 12:26:23,104 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 107 transitions. [2018-10-04 12:26:23,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-10-04 12:26:23,105 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:26:23,105 INFO L375 BasicCegarLoop]: trace histogram [42, 36, 7, 6, 6, 1, 1, 1] [2018-10-04 12:26:23,106 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:26:23,106 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:26:23,106 INFO L82 PathProgramCache]: Analyzing trace with hash 883432563, now seen corresponding path program 7 times [2018-10-04 12:26:23,106 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:26:23,106 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:26:23,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:23,109 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:26:23,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:23,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:23,603 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1512 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2018-10-04 12:26:23,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:26:23,604 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:26:23,612 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:26:23,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:23,664 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:26:24,187 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1554 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-10-04 12:26:24,206 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:26:24,207 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 14] total 14 [2018-10-04 12:26:24,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-04 12:26:24,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-04 12:26:24,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2018-10-04 12:26:24,208 INFO L87 Difference]: Start difference. First operand 101 states and 107 transitions. Second operand 15 states. [2018-10-04 12:26:24,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:26:24,539 INFO L93 Difference]: Finished difference Result 133 states and 141 transitions. [2018-10-04 12:26:24,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-04 12:26:24,541 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 100 [2018-10-04 12:26:24,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:26:24,543 INFO L225 Difference]: With dead ends: 133 [2018-10-04 12:26:24,543 INFO L226 Difference]: Without dead ends: 131 [2018-10-04 12:26:24,543 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2018-10-04 12:26:24,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2018-10-04 12:26:24,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 117. [2018-10-04 12:26:24,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-04 12:26:24,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 124 transitions. [2018-10-04 12:26:24,568 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 124 transitions. Word has length 100 [2018-10-04 12:26:24,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:26:24,568 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 124 transitions. [2018-10-04 12:26:24,569 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-04 12:26:24,569 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 124 transitions. [2018-10-04 12:26:24,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-04 12:26:24,570 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:26:24,570 INFO L375 BasicCegarLoop]: trace histogram [49, 42, 8, 7, 7, 1, 1, 1] [2018-10-04 12:26:24,571 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:26:24,571 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:26:24,571 INFO L82 PathProgramCache]: Analyzing trace with hash -1346298395, now seen corresponding path program 8 times [2018-10-04 12:26:24,571 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:26:24,571 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:26:24,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:24,572 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:26:24,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:24,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:24,753 INFO L134 CoverageAnalysis]: Checked inductivity of 2408 backedges. 0 proven. 2114 refuted. 0 times theorem prover too weak. 294 trivial. 0 not checked. [2018-10-04 12:26:24,754 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:26:24,754 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:26:24,768 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-04 12:26:24,812 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-04 12:26:24,812 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:26:24,817 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:26:24,912 INFO L134 CoverageAnalysis]: Checked inductivity of 2408 backedges. 0 proven. 2114 refuted. 0 times theorem prover too weak. 294 trivial. 0 not checked. [2018-10-04 12:26:24,942 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:26:24,942 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-04 12:26:24,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-04 12:26:24,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-04 12:26:24,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-04 12:26:24,943 INFO L87 Difference]: Start difference. First operand 117 states and 124 transitions. Second operand 10 states. [2018-10-04 12:26:25,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:26:25,377 INFO L93 Difference]: Finished difference Result 149 states and 158 transitions. [2018-10-04 12:26:25,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-04 12:26:25,379 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 116 [2018-10-04 12:26:25,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:26:25,380 INFO L225 Difference]: With dead ends: 149 [2018-10-04 12:26:25,381 INFO L226 Difference]: Without dead ends: 147 [2018-10-04 12:26:25,383 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 115 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-04 12:26:25,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-10-04 12:26:25,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 133. [2018-10-04 12:26:25,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-10-04 12:26:25,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 141 transitions. [2018-10-04 12:26:25,411 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 141 transitions. Word has length 116 [2018-10-04 12:26:25,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:26:25,411 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 141 transitions. [2018-10-04 12:26:25,411 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-04 12:26:25,411 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 141 transitions. [2018-10-04 12:26:25,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-10-04 12:26:25,413 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:26:25,414 INFO L375 BasicCegarLoop]: trace histogram [56, 48, 9, 8, 8, 1, 1, 1] [2018-10-04 12:26:25,414 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:26:25,414 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:26:25,414 INFO L82 PathProgramCache]: Analyzing trace with hash 1851587415, now seen corresponding path program 9 times [2018-10-04 12:26:25,414 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:26:25,414 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:26:25,415 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:25,415 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:26:25,415 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:25,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:25,750 INFO L134 CoverageAnalysis]: Checked inductivity of 3152 backedges. 0 proven. 2816 refuted. 0 times theorem prover too weak. 336 trivial. 0 not checked. [2018-10-04 12:26:25,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:26:25,750 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:26:25,758 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-04 12:26:25,820 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-04 12:26:25,821 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:26:25,828 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:26:25,995 INFO L134 CoverageAnalysis]: Checked inductivity of 3152 backedges. 702 proven. 42 refuted. 0 times theorem prover too weak. 2408 trivial. 0 not checked. [2018-10-04 12:26:26,024 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:26:26,025 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 18 [2018-10-04 12:26:26,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-04 12:26:26,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-04 12:26:26,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-04 12:26:26,028 INFO L87 Difference]: Start difference. First operand 133 states and 141 transitions. Second operand 18 states. [2018-10-04 12:26:28,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:26:28,818 INFO L93 Difference]: Finished difference Result 299 states and 327 transitions. [2018-10-04 12:26:28,821 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-10-04 12:26:28,821 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 132 [2018-10-04 12:26:28,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:26:28,822 INFO L225 Difference]: With dead ends: 299 [2018-10-04 12:26:28,823 INFO L226 Difference]: Without dead ends: 183 [2018-10-04 12:26:28,827 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1953 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=285, Invalid=6195, Unknown=0, NotChecked=0, Total=6480 [2018-10-04 12:26:28,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2018-10-04 12:26:28,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 167. [2018-10-04 12:26:28,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-04 12:26:28,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 176 transitions. [2018-10-04 12:26:28,862 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 176 transitions. Word has length 132 [2018-10-04 12:26:28,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:26:28,862 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 176 transitions. [2018-10-04 12:26:28,862 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-04 12:26:28,863 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 176 transitions. [2018-10-04 12:26:28,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2018-10-04 12:26:28,871 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:26:28,871 INFO L375 BasicCegarLoop]: trace histogram [72, 63, 10, 9, 9, 1, 1, 1] [2018-10-04 12:26:28,871 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:26:28,872 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:26:28,872 INFO L82 PathProgramCache]: Analyzing trace with hash -132347917, now seen corresponding path program 10 times [2018-10-04 12:26:28,872 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:26:28,872 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:26:28,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:28,874 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:26:28,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:28,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:29,156 INFO L134 CoverageAnalysis]: Checked inductivity of 5202 backedges. 0 proven. 4698 refuted. 0 times theorem prover too weak. 504 trivial. 0 not checked. [2018-10-04 12:26:29,156 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:26:29,156 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:26:29,164 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-04 12:26:29,228 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-04 12:26:29,228 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:26:29,232 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:26:29,388 INFO L134 CoverageAnalysis]: Checked inductivity of 5202 backedges. 1952 proven. 56 refuted. 0 times theorem prover too weak. 3194 trivial. 0 not checked. [2018-10-04 12:26:29,408 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:26:29,408 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 20 [2018-10-04 12:26:29,409 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-04 12:26:29,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-04 12:26:29,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-04 12:26:29,410 INFO L87 Difference]: Start difference. First operand 167 states and 176 transitions. Second operand 20 states. [2018-10-04 12:26:31,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:26:31,739 INFO L93 Difference]: Finished difference Result 371 states and 402 transitions. [2018-10-04 12:26:31,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2018-10-04 12:26:31,741 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 166 [2018-10-04 12:26:31,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:26:31,743 INFO L225 Difference]: With dead ends: 371 [2018-10-04 12:26:31,743 INFO L226 Difference]: Without dead ends: 223 [2018-10-04 12:26:31,747 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3160 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=357, Invalid=9543, Unknown=0, NotChecked=0, Total=9900 [2018-10-04 12:26:31,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-10-04 12:26:31,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 205. [2018-10-04 12:26:31,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-10-04 12:26:31,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 215 transitions. [2018-10-04 12:26:31,772 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 215 transitions. Word has length 166 [2018-10-04 12:26:31,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:26:31,772 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 215 transitions. [2018-10-04 12:26:31,772 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-04 12:26:31,772 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 215 transitions. [2018-10-04 12:26:31,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-10-04 12:26:31,774 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:26:31,774 INFO L375 BasicCegarLoop]: trace histogram [90, 80, 11, 10, 10, 1, 1, 1] [2018-10-04 12:26:31,775 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:26:31,775 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:26:31,775 INFO L82 PathProgramCache]: Analyzing trace with hash -1568317117, now seen corresponding path program 11 times [2018-10-04 12:26:31,775 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:26:31,775 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:26:31,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:31,776 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:26:31,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:31,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:32,774 INFO L134 CoverageAnalysis]: Checked inductivity of 8120 backedges. 0 proven. 7400 refuted. 0 times theorem prover too weak. 720 trivial. 0 not checked. [2018-10-04 12:26:32,774 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:26:32,775 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:26:32,783 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-04 12:26:32,995 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2018-10-04 12:26:32,995 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:26:32,999 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:26:33,210 INFO L134 CoverageAnalysis]: Checked inductivity of 8120 backedges. 3774 proven. 72 refuted. 0 times theorem prover too weak. 4274 trivial. 0 not checked. [2018-10-04 12:26:33,232 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:26:33,232 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 22 [2018-10-04 12:26:33,233 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-04 12:26:33,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-04 12:26:33,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-10-04 12:26:33,234 INFO L87 Difference]: Start difference. First operand 205 states and 215 transitions. Second operand 22 states. [2018-10-04 12:26:37,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:26:37,074 INFO L93 Difference]: Finished difference Result 451 states and 485 transitions. [2018-10-04 12:26:37,075 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2018-10-04 12:26:37,075 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 204 [2018-10-04 12:26:37,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:26:37,076 INFO L225 Difference]: With dead ends: 451 [2018-10-04 12:26:37,076 INFO L226 Difference]: Without dead ends: 267 [2018-10-04 12:26:37,081 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4851 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=437, Invalid=14083, Unknown=0, NotChecked=0, Total=14520 [2018-10-04 12:26:37,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2018-10-04 12:26:37,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 247. [2018-10-04 12:26:37,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2018-10-04 12:26:37,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 258 transitions. [2018-10-04 12:26:37,113 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 258 transitions. Word has length 204 [2018-10-04 12:26:37,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:26:37,114 INFO L480 AbstractCegarLoop]: Abstraction has 247 states and 258 transitions. [2018-10-04 12:26:37,114 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-04 12:26:37,114 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 258 transitions. [2018-10-04 12:26:37,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2018-10-04 12:26:37,117 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:26:37,117 INFO L375 BasicCegarLoop]: trace histogram [110, 99, 12, 11, 11, 1, 1, 1] [2018-10-04 12:26:37,117 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:26:37,117 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:26:37,117 INFO L82 PathProgramCache]: Analyzing trace with hash 915329223, now seen corresponding path program 12 times [2018-10-04 12:26:37,118 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:26:37,118 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:26:37,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:37,119 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:26:37,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:37,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:37,580 INFO L134 CoverageAnalysis]: Checked inductivity of 12122 backedges. 0 proven. 11132 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2018-10-04 12:26:37,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:26:37,580 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:26:37,587 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-04 12:26:42,382 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 21 check-sat command(s) [2018-10-04 12:26:42,382 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:26:42,399 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:26:42,680 INFO L134 CoverageAnalysis]: Checked inductivity of 12122 backedges. 2022 proven. 90 refuted. 0 times theorem prover too weak. 10010 trivial. 0 not checked. [2018-10-04 12:26:42,700 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:26:42,701 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 24 [2018-10-04 12:26:42,701 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-04 12:26:42,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-04 12:26:42,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-10-04 12:26:42,702 INFO L87 Difference]: Start difference. First operand 247 states and 258 transitions. Second operand 24 states. [2018-10-04 12:26:47,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:26:47,015 INFO L93 Difference]: Finished difference Result 539 states and 576 transitions. [2018-10-04 12:26:47,015 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2018-10-04 12:26:47,015 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 246 [2018-10-04 12:26:47,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:26:47,017 INFO L225 Difference]: With dead ends: 539 [2018-10-04 12:26:47,017 INFO L226 Difference]: Without dead ends: 315 [2018-10-04 12:26:47,023 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 236 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7140 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=525, Invalid=20067, Unknown=0, NotChecked=0, Total=20592 [2018-10-04 12:26:47,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2018-10-04 12:26:47,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 293. [2018-10-04 12:26:47,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 293 states. [2018-10-04 12:26:47,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 305 transitions. [2018-10-04 12:26:47,060 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 305 transitions. Word has length 246 [2018-10-04 12:26:47,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:26:47,061 INFO L480 AbstractCegarLoop]: Abstraction has 293 states and 305 transitions. [2018-10-04 12:26:47,061 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-04 12:26:47,061 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 305 transitions. [2018-10-04 12:26:47,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2018-10-04 12:26:47,062 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:26:47,063 INFO L375 BasicCegarLoop]: trace histogram [132, 120, 13, 12, 12, 1, 1, 1] [2018-10-04 12:26:47,063 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:26:47,063 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:26:47,063 INFO L82 PathProgramCache]: Analyzing trace with hash 154612223, now seen corresponding path program 13 times [2018-10-04 12:26:47,063 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:26:47,064 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:26:47,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:47,064 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:26:47,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:47,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:47,809 INFO L134 CoverageAnalysis]: Checked inductivity of 17448 backedges. 0 proven. 16128 refuted. 0 times theorem prover too weak. 1320 trivial. 0 not checked. [2018-10-04 12:26:47,809 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:26:47,809 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:26:47,817 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:26:47,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:47,920 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:26:48,057 INFO L134 CoverageAnalysis]: Checked inductivity of 17448 backedges. 0 proven. 16128 refuted. 0 times theorem prover too weak. 1320 trivial. 0 not checked. [2018-10-04 12:26:48,088 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:26:48,088 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-10-04 12:26:48,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-04 12:26:48,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-04 12:26:48,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-04 12:26:48,090 INFO L87 Difference]: Start difference. First operand 293 states and 305 transitions. Second operand 15 states. [2018-10-04 12:26:48,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:26:48,446 INFO L93 Difference]: Finished difference Result 341 states and 355 transitions. [2018-10-04 12:26:48,447 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-04 12:26:48,447 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 292 [2018-10-04 12:26:48,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:26:48,448 INFO L225 Difference]: With dead ends: 341 [2018-10-04 12:26:48,449 INFO L226 Difference]: Without dead ends: 339 [2018-10-04 12:26:48,449 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 291 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-04 12:26:48,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2018-10-04 12:26:48,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 317. [2018-10-04 12:26:48,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 317 states. [2018-10-04 12:26:48,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 330 transitions. [2018-10-04 12:26:48,498 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 330 transitions. Word has length 292 [2018-10-04 12:26:48,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:26:48,498 INFO L480 AbstractCegarLoop]: Abstraction has 317 states and 330 transitions. [2018-10-04 12:26:48,498 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-04 12:26:48,498 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 330 transitions. [2018-10-04 12:26:48,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2018-10-04 12:26:48,499 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:26:48,500 INFO L375 BasicCegarLoop]: trace histogram [143, 130, 14, 13, 13, 1, 1, 1] [2018-10-04 12:26:48,500 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:26:48,500 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:26:48,500 INFO L82 PathProgramCache]: Analyzing trace with hash -114885159, now seen corresponding path program 14 times [2018-10-04 12:26:48,500 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:26:48,500 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:26:48,501 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:48,501 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:26:48,501 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:48,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:48,957 INFO L134 CoverageAnalysis]: Checked inductivity of 20488 backedges. 0 proven. 19058 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2018-10-04 12:26:48,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:26:48,958 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:26:48,972 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-04 12:26:49,079 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-04 12:26:49,079 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:26:49,085 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:26:49,265 INFO L134 CoverageAnalysis]: Checked inductivity of 20488 backedges. 0 proven. 19058 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2018-10-04 12:26:49,285 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:26:49,286 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-04 12:26:49,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-04 12:26:49,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-04 12:26:49,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-04 12:26:49,287 INFO L87 Difference]: Start difference. First operand 317 states and 330 transitions. Second operand 16 states. [2018-10-04 12:26:49,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:26:49,624 INFO L93 Difference]: Finished difference Result 365 states and 380 transitions. [2018-10-04 12:26:49,624 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-04 12:26:49,625 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 316 [2018-10-04 12:26:49,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:26:49,627 INFO L225 Difference]: With dead ends: 365 [2018-10-04 12:26:49,627 INFO L226 Difference]: Without dead ends: 363 [2018-10-04 12:26:49,627 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 315 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-04 12:26:49,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 363 states. [2018-10-04 12:26:49,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 363 to 341. [2018-10-04 12:26:49,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 341 states. [2018-10-04 12:26:49,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 355 transitions. [2018-10-04 12:26:49,678 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 355 transitions. Word has length 316 [2018-10-04 12:26:49,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:26:49,679 INFO L480 AbstractCegarLoop]: Abstraction has 341 states and 355 transitions. [2018-10-04 12:26:49,679 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-04 12:26:49,679 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 355 transitions. [2018-10-04 12:26:49,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 341 [2018-10-04 12:26:49,681 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:26:49,682 INFO L375 BasicCegarLoop]: trace histogram [154, 140, 15, 14, 14, 1, 1, 1] [2018-10-04 12:26:49,682 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:26:49,682 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:26:49,682 INFO L82 PathProgramCache]: Analyzing trace with hash -1438164045, now seen corresponding path program 15 times [2018-10-04 12:26:49,682 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:26:49,682 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:26:49,683 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:49,683 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:26:49,683 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:49,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:50,819 INFO L134 CoverageAnalysis]: Checked inductivity of 23772 backedges. 0 proven. 22232 refuted. 0 times theorem prover too weak. 1540 trivial. 0 not checked. [2018-10-04 12:26:50,819 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:26:50,819 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:26:50,828 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown