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 0.1.23-4eac566 [2018-09-23 19:43:22,762 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-23 19:43:22,765 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-23 19:43:22,781 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2018-09-23 19:43:22,840 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 [2018-09-23 19:43:22,861 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-23 19:43:22,861 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-23 19:43:22,862 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-23 19:43:22,862 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-09-23 19:43:22,863 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-09-23 19:43:22,863 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-09-23 19:43:22,863 INFO L133 SettingsManager]: * Use SBE=true [2018-09-23 19:43:22,864 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-23 19:43:22,864 INFO L133 SettingsManager]: * sizeof long=4 [2018-09-23 19:43:22,864 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-23 19:43:22,864 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-09-23 19:43:22,864 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-23 19:43:22,865 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-23 19:43:22,865 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-23 19:43:22,865 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-23 19:43:22,865 INFO L133 SettingsManager]: * sizeof long double=12 [2018-09-23 19:43:22,865 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-23 19:43:22,865 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-23 19:43:22,866 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-23 19:43:22,866 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-23 19:43:22,866 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-23 19:43:22,866 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-23 19:43:22,866 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-23 19:43:22,867 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-23 19:43:22,867 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-23 19:43:22,867 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-23 19:43:22,867 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-09-23 19:43:22,867 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-23 19:43:22,868 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-23 19:43:22,868 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-23 19:43:22,933 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-23 19:43:22,949 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-23 19:43:22,956 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-23 19:43:22,958 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-23 19:43:22,958 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-23 19:43:22,959 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/nested1.i_4.bpl [2018-09-23 19:43:22,960 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/nested1.i_4.bpl' [2018-09-23 19:43:23,021 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-23 19:43:23,024 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-23 19:43:23,025 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-23 19:43:23,025 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-23 19:43:23,027 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-23 19:43:23,047 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 23.09 07:43:23" (1/1) ... [2018-09-23 19:43:23,059 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 23.09 07:43:23" (1/1) ... [2018-09-23 19:43:23,066 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-23 19:43:23,067 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-23 19:43:23,067 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-23 19:43:23,067 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-23 19:43:23,078 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:43:23" (1/1) ... [2018-09-23 19:43:23,079 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:43:23" (1/1) ... [2018-09-23 19:43:23,079 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:43:23" (1/1) ... [2018-09-23 19:43:23,080 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:43:23" (1/1) ... [2018-09-23 19:43:23,082 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:43:23" (1/1) ... [2018-09-23 19:43:23,084 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:43:23" (1/1) ... [2018-09-23 19:43:23,085 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:43:23" (1/1) ... [2018-09-23 19:43:23,087 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-23 19:43:23,087 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-23 19:43:23,087 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-23 19:43:23,087 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-23 19:43:23,089 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:43:23" (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 [2018-09-23 19:43:23,154 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-23 19:43:23,154 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-23 19:43:23,450 INFO L354 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-23 19:43:23,450 INFO L202 PluginConnector]: Adding new model nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.09 07:43:23 BoogieIcfgContainer [2018-09-23 19:43:23,451 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-23 19:43:23,452 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-23 19:43:23,452 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-23 19:43:23,455 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-23 19:43:23,456 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:43:23" (1/2) ... [2018-09-23 19:43:23,457 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fe97bf2 and model type nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.09 07:43:23, skipping insertion in model container [2018-09-23 19:43:23,457 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.09 07:43:23" (2/2) ... [2018-09-23 19:43:23,459 INFO L112 eAbstractionObserver]: Analyzing ICFG nested1.i_4.bpl [2018-09-23 19:43:23,470 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-23 19:43:23,478 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-23 19:43:23,532 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-23 19:43:23,533 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-23 19:43:23,533 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-23 19:43:23,533 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-23 19:43:23,533 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-23 19:43:23,533 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-23 19:43:23,534 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-23 19:43:23,534 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-23 19:43:23,534 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-23 19:43:23,550 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-09-23 19:43:23,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-09-23 19:43:23,557 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:43:23,558 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-09-23 19:43:23,559 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:43:23,566 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:43:23,566 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2018-09-23 19:43:23,569 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:43:23,570 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:43:23,622 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:23,623 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:43:23,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:23,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:23,777 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:43:23,779 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-23 19:43:23,780 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-23 19:43:23,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-23 19:43:23,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-23 19:43:23,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-23 19:43:23,798 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-09-23 19:43:23,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:43:23,885 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2018-09-23 19:43:23,885 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-23 19:43:23,887 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-09-23 19:43:23,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:43:23,897 INFO L225 Difference]: With dead ends: 17 [2018-09-23 19:43:23,897 INFO L226 Difference]: Without dead ends: 11 [2018-09-23 19:43:23,901 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 [2018-09-23 19:43:23,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-23 19:43:23,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 9. [2018-09-23 19:43:23,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-09-23 19:43:23,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2018-09-23 19:43:23,938 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 4 [2018-09-23 19:43:23,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:43:23,939 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2018-09-23 19:43:23,939 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-23 19:43:23,939 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2018-09-23 19:43:23,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-09-23 19:43:23,939 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:43:23,939 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2018-09-23 19:43:23,940 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:43:23,940 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:43:23,940 INFO L82 PathProgramCache]: Analyzing trace with hash 209100445, now seen corresponding path program 1 times [2018-09-23 19:43:23,940 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:43:23,940 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:43:23,941 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:23,941 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:43:23,942 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:23,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:24,039 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:43:24,039 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-23 19:43:24,040 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-09-23 19:43:24,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-23 19:43:24,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-23 19:43:24,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-23 19:43:24,044 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 3 states. [2018-09-23 19:43:24,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:43:24,109 INFO L93 Difference]: Finished difference Result 17 states and 20 transitions. [2018-09-23 19:43:24,109 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-23 19:43:24,110 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2018-09-23 19:43:24,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:43:24,110 INFO L225 Difference]: With dead ends: 17 [2018-09-23 19:43:24,110 INFO L226 Difference]: Without dead ends: 11 [2018-09-23 19:43:24,112 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 [2018-09-23 19:43:24,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-23 19:43:24,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-09-23 19:43:24,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-09-23 19:43:24,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2018-09-23 19:43:24,123 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2018-09-23 19:43:24,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:43:24,123 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2018-09-23 19:43:24,123 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-23 19:43:24,123 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2018-09-23 19:43:24,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-23 19:43:24,124 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:43:24,124 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2018-09-23 19:43:24,124 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:43:24,125 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:43:24,125 INFO L82 PathProgramCache]: Analyzing trace with hash -850198025, now seen corresponding path program 1 times [2018-09-23 19:43:24,125 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:43:24,125 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:43:24,126 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:24,126 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:43:24,126 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:24,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:24,236 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:43:24,237 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:43:24,237 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 [2018-09-23 19:43:24,247 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:43:24,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:24,282 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:43:24,573 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:43:24,602 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:43:24,602 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 7 [2018-09-23 19:43:24,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-23 19:43:24,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-23 19:43:24,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-09-23 19:43:24,603 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 7 states. [2018-09-23 19:43:24,913 WARN L178 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-09-23 19:43:25,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:43:25,100 INFO L93 Difference]: Finished difference Result 35 states and 43 transitions. [2018-09-23 19:43:25,102 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-23 19:43:25,103 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 10 [2018-09-23 19:43:25,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:43:25,104 INFO L225 Difference]: With dead ends: 35 [2018-09-23 19:43:25,105 INFO L226 Difference]: Without dead ends: 27 [2018-09-23 19:43:25,106 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2018-09-23 19:43:25,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-23 19:43:25,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 21. [2018-09-23 19:43:25,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-09-23 19:43:25,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2018-09-23 19:43:25,118 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 10 [2018-09-23 19:43:25,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:43:25,118 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2018-09-23 19:43:25,120 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-23 19:43:25,120 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2018-09-23 19:43:25,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-23 19:43:25,121 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:43:25,122 INFO L375 BasicCegarLoop]: trace histogram [6, 4, 3, 2, 2, 1, 1, 1] [2018-09-23 19:43:25,123 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:43:25,123 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:43:25,123 INFO L82 PathProgramCache]: Analyzing trace with hash 1881088987, now seen corresponding path program 2 times [2018-09-23 19:43:25,124 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:43:25,124 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:43:25,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:25,126 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:43:25,126 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:25,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:25,243 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-09-23 19:43:25,243 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:43:25,243 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 [2018-09-23 19:43:25,264 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 19:43:25,287 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 19:43:25,288 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:43:25,290 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:43:25,375 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-09-23 19:43:25,409 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:43:25,409 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 8 [2018-09-23 19:43:25,412 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-23 19:43:25,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-23 19:43:25,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-09-23 19:43:25,413 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 8 states. [2018-09-23 19:43:26,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:43:26,048 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2018-09-23 19:43:26,050 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-23 19:43:26,051 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2018-09-23 19:43:26,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:43:26,052 INFO L225 Difference]: With dead ends: 55 [2018-09-23 19:43:26,052 INFO L226 Difference]: Without dead ends: 43 [2018-09-23 19:43:26,057 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 [2018-09-23 19:43:26,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-09-23 19:43:26,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 35. [2018-09-23 19:43:26,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-09-23 19:43:26,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2018-09-23 19:43:26,074 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 20 [2018-09-23 19:43:26,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:43:26,074 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2018-09-23 19:43:26,074 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-23 19:43:26,074 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2018-09-23 19:43:26,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-09-23 19:43:26,078 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:43:26,078 INFO L375 BasicCegarLoop]: trace histogram [12, 9, 4, 3, 3, 1, 1, 1] [2018-09-23 19:43:26,078 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:43:26,079 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:43:26,079 INFO L82 PathProgramCache]: Analyzing trace with hash 501354739, now seen corresponding path program 3 times [2018-09-23 19:43:26,079 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:43:26,079 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:43:26,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:26,081 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:43:26,081 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:26,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:26,266 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 70 proven. 12 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2018-09-23 19:43:26,267 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:43:26,267 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 [2018-09-23 19:43:26,283 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 19:43:26,329 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-09-23 19:43:26,329 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:43:26,334 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:43:26,364 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 70 proven. 12 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2018-09-23 19:43:26,392 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:43:26,392 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-09-23 19:43:26,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-23 19:43:26,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-23 19:43:26,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-23 19:43:26,394 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand 6 states. [2018-09-23 19:43:26,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:43:26,484 INFO L93 Difference]: Finished difference Result 65 states and 73 transitions. [2018-09-23 19:43:26,486 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-23 19:43:26,486 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 34 [2018-09-23 19:43:26,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:43:26,487 INFO L225 Difference]: With dead ends: 65 [2018-09-23 19:43:26,487 INFO L226 Difference]: Without dead ends: 41 [2018-09-23 19:43:26,488 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 [2018-09-23 19:43:26,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-09-23 19:43:26,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-09-23 19:43:26,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-09-23 19:43:26,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-09-23 19:43:26,499 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 34 [2018-09-23 19:43:26,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:43:26,499 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-09-23 19:43:26,499 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-23 19:43:26,499 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-09-23 19:43:26,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-09-23 19:43:26,501 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:43:26,501 INFO L375 BasicCegarLoop]: trace histogram [15, 12, 4, 3, 3, 1, 1, 1] [2018-09-23 19:43:26,501 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:43:26,501 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:43:26,501 INFO L82 PathProgramCache]: Analyzing trace with hash 209827969, now seen corresponding path program 4 times [2018-09-23 19:43:26,502 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:43:26,502 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:43:26,502 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:26,503 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:43:26,503 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:26,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:26,708 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-09-23 19:43:26,709 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:43:26,709 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 [2018-09-23 19:43:26,716 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 19:43:26,741 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 19:43:26,741 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:43:26,744 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:43:26,948 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-09-23 19:43:26,983 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:43:26,984 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 9] total 9 [2018-09-23 19:43:26,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-23 19:43:26,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-23 19:43:26,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2018-09-23 19:43:26,985 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 10 states. [2018-09-23 19:43:27,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:43:27,161 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2018-09-23 19:43:27,162 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-23 19:43:27,162 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 40 [2018-09-23 19:43:27,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:43:27,164 INFO L225 Difference]: With dead ends: 65 [2018-09-23 19:43:27,164 INFO L226 Difference]: Without dead ends: 63 [2018-09-23 19:43:27,164 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2018-09-23 19:43:27,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-09-23 19:43:27,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 53. [2018-09-23 19:43:27,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-09-23 19:43:27,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2018-09-23 19:43:27,179 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 40 [2018-09-23 19:43:27,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:43:27,179 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2018-09-23 19:43:27,180 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-23 19:43:27,180 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2018-09-23 19:43:27,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-09-23 19:43:27,181 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:43:27,182 INFO L375 BasicCegarLoop]: trace histogram [20, 16, 5, 4, 4, 1, 1, 1] [2018-09-23 19:43:27,182 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:43:27,182 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:43:27,182 INFO L82 PathProgramCache]: Analyzing trace with hash -1874565441, now seen corresponding path program 5 times [2018-09-23 19:43:27,182 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:43:27,183 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:43:27,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:27,184 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:43:27,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:27,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:27,408 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 320 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2018-09-23 19:43:27,409 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:43:27,409 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) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 19:43:27,424 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 19:43:27,443 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-23 19:43:27,443 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:43:27,448 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:43:27,582 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 262 proven. 20 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2018-09-23 19:43:27,606 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:43:27,606 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2018-09-23 19:43:27,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-23 19:43:27,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-23 19:43:27,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-09-23 19:43:27,608 INFO L87 Difference]: Start difference. First operand 53 states and 57 transitions. Second operand 12 states. [2018-09-23 19:43:28,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:43:28,764 INFO L93 Difference]: Finished difference Result 127 states and 143 transitions. [2018-09-23 19:43:28,765 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-09-23 19:43:28,765 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 52 [2018-09-23 19:43:28,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:43:28,767 INFO L225 Difference]: With dead ends: 127 [2018-09-23 19:43:28,767 INFO L226 Difference]: Without dead ends: 87 [2018-09-23 19:43:28,768 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=121, Invalid=1211, Unknown=0, NotChecked=0, Total=1332 [2018-09-23 19:43:28,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-09-23 19:43:28,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 75. [2018-09-23 19:43:28,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-09-23 19:43:28,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 80 transitions. [2018-09-23 19:43:28,784 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 80 transitions. Word has length 52 [2018-09-23 19:43:28,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:43:28,785 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 80 transitions. [2018-09-23 19:43:28,785 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-23 19:43:28,785 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 80 transitions. [2018-09-23 19:43:28,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-09-23 19:43:28,787 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:43:28,787 INFO L375 BasicCegarLoop]: trace histogram [30, 25, 6, 5, 5, 1, 1, 1] [2018-09-23 19:43:28,788 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:43:28,788 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:43:28,788 INFO L82 PathProgramCache]: Analyzing trace with hash -1734028097, now seen corresponding path program 6 times [2018-09-23 19:43:28,788 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:43:28,788 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:43:28,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:28,789 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:43:28,790 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:28,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:29,036 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 750 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2018-09-23 19:43:29,036 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:43:29,036 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 [2018-09-23 19:43:29,045 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 19:43:29,146 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2018-09-23 19:43:29,146 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:43:29,150 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:43:29,427 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 520 proven. 30 refuted. 0 times theorem prover too weak. 350 trivial. 0 not checked. [2018-09-23 19:43:29,448 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:43:29,449 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2018-09-23 19:43:29,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-23 19:43:29,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-23 19:43:29,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-09-23 19:43:29,450 INFO L87 Difference]: Start difference. First operand 75 states and 80 transitions. Second operand 14 states. [2018-09-23 19:43:30,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:43:30,788 INFO L93 Difference]: Finished difference Result 175 states and 194 transitions. [2018-09-23 19:43:30,791 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-09-23 19:43:30,791 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 74 [2018-09-23 19:43:30,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:43:30,794 INFO L225 Difference]: With dead ends: 175 [2018-09-23 19:43:30,794 INFO L226 Difference]: Without dead ends: 115 [2018-09-23 19:43:30,799 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 630 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=169, Invalid=2281, Unknown=0, NotChecked=0, Total=2450 [2018-09-23 19:43:30,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-09-23 19:43:30,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 101. [2018-09-23 19:43:30,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-09-23 19:43:30,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 107 transitions. [2018-09-23 19:43:30,823 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 107 transitions. Word has length 74 [2018-09-23 19:43:30,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:43:30,824 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 107 transitions. [2018-09-23 19:43:30,824 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-23 19:43:30,824 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 107 transitions. [2018-09-23 19:43:30,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-09-23 19:43:30,826 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:43:30,826 INFO L375 BasicCegarLoop]: trace histogram [42, 36, 7, 6, 6, 1, 1, 1] [2018-09-23 19:43:30,826 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:43:30,826 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:43:30,827 INFO L82 PathProgramCache]: Analyzing trace with hash 883432563, now seen corresponding path program 7 times [2018-09-23 19:43:30,827 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:43:30,827 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:43:30,828 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:30,828 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:43:30,828 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:30,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:31,203 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1512 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2018-09-23 19:43:31,204 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:43:31,204 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 [2018-09-23 19:43:31,212 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:43:31,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:31,263 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:43:31,615 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1554 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-09-23 19:43:31,636 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:43:31,636 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 14] total 14 [2018-09-23 19:43:31,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-23 19:43:31,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-23 19:43:31,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2018-09-23 19:43:31,637 INFO L87 Difference]: Start difference. First operand 101 states and 107 transitions. Second operand 15 states. [2018-09-23 19:43:32,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:43:32,234 INFO L93 Difference]: Finished difference Result 133 states and 141 transitions. [2018-09-23 19:43:32,235 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-23 19:43:32,235 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 100 [2018-09-23 19:43:32,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:43:32,236 INFO L225 Difference]: With dead ends: 133 [2018-09-23 19:43:32,236 INFO L226 Difference]: Without dead ends: 131 [2018-09-23 19:43:32,237 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2018-09-23 19:43:32,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2018-09-23 19:43:32,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 117. [2018-09-23 19:43:32,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-09-23 19:43:32,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 124 transitions. [2018-09-23 19:43:32,261 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 124 transitions. Word has length 100 [2018-09-23 19:43:32,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:43:32,262 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 124 transitions. [2018-09-23 19:43:32,262 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-23 19:43:32,262 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 124 transitions. [2018-09-23 19:43:32,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-09-23 19:43:32,264 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:43:32,264 INFO L375 BasicCegarLoop]: trace histogram [49, 42, 8, 7, 7, 1, 1, 1] [2018-09-23 19:43:32,265 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:43:32,265 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:43:32,265 INFO L82 PathProgramCache]: Analyzing trace with hash -1346298395, now seen corresponding path program 8 times [2018-09-23 19:43:32,265 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:43:32,265 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:43:32,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:32,266 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:43:32,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:32,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:32,549 INFO L134 CoverageAnalysis]: Checked inductivity of 2408 backedges. 0 proven. 2114 refuted. 0 times theorem prover too weak. 294 trivial. 0 not checked. [2018-09-23 19:43:32,550 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:43:32,550 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 [2018-09-23 19:43:32,562 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 19:43:32,609 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 19:43:32,610 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:43:32,615 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:43:32,724 INFO L134 CoverageAnalysis]: Checked inductivity of 2408 backedges. 0 proven. 2114 refuted. 0 times theorem prover too weak. 294 trivial. 0 not checked. [2018-09-23 19:43:32,746 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:43:32,747 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-09-23 19:43:32,747 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-23 19:43:32,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-23 19:43:32,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-09-23 19:43:32,748 INFO L87 Difference]: Start difference. First operand 117 states and 124 transitions. Second operand 10 states. [2018-09-23 19:43:33,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:43:33,212 INFO L93 Difference]: Finished difference Result 149 states and 158 transitions. [2018-09-23 19:43:33,213 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-23 19:43:33,213 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 116 [2018-09-23 19:43:33,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:43:33,220 INFO L225 Difference]: With dead ends: 149 [2018-09-23 19:43:33,221 INFO L226 Difference]: Without dead ends: 147 [2018-09-23 19:43:33,221 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 115 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-09-23 19:43:33,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-09-23 19:43:33,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 133. [2018-09-23 19:43:33,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-09-23 19:43:33,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 141 transitions. [2018-09-23 19:43:33,254 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 141 transitions. Word has length 116 [2018-09-23 19:43:33,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:43:33,255 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 141 transitions. [2018-09-23 19:43:33,255 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-23 19:43:33,255 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 141 transitions. [2018-09-23 19:43:33,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-09-23 19:43:33,257 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:43:33,257 INFO L375 BasicCegarLoop]: trace histogram [56, 48, 9, 8, 8, 1, 1, 1] [2018-09-23 19:43:33,257 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:43:33,257 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:43:33,257 INFO L82 PathProgramCache]: Analyzing trace with hash 1851587415, now seen corresponding path program 9 times [2018-09-23 19:43:33,258 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:43:33,258 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:43:33,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:33,259 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:43:33,259 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:33,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:33,499 INFO L134 CoverageAnalysis]: Checked inductivity of 3152 backedges. 0 proven. 2816 refuted. 0 times theorem prover too weak. 336 trivial. 0 not checked. [2018-09-23 19:43:33,500 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:43:33,500 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 [2018-09-23 19:43:33,508 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 19:43:33,566 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-09-23 19:43:33,566 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:43:33,570 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:43:33,788 INFO L134 CoverageAnalysis]: Checked inductivity of 3152 backedges. 702 proven. 42 refuted. 0 times theorem prover too weak. 2408 trivial. 0 not checked. [2018-09-23 19:43:33,809 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:43:33,810 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 18 [2018-09-23 19:43:33,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-23 19:43:33,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-23 19:43:33,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-09-23 19:43:33,811 INFO L87 Difference]: Start difference. First operand 133 states and 141 transitions. Second operand 18 states. [2018-09-23 19:43:36,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:43:36,696 INFO L93 Difference]: Finished difference Result 299 states and 327 transitions. [2018-09-23 19:43:36,696 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-09-23 19:43:36,696 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 132 [2018-09-23 19:43:36,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:43:36,697 INFO L225 Difference]: With dead ends: 299 [2018-09-23 19:43:36,698 INFO L226 Difference]: Without dead ends: 183 [2018-09-23 19:43:36,701 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 [2018-09-23 19:43:36,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2018-09-23 19:43:36,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 167. [2018-09-23 19:43:36,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-09-23 19:43:36,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 176 transitions. [2018-09-23 19:43:36,729 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 176 transitions. Word has length 132 [2018-09-23 19:43:36,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:43:36,729 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 176 transitions. [2018-09-23 19:43:36,729 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-23 19:43:36,729 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 176 transitions. [2018-09-23 19:43:36,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2018-09-23 19:43:36,731 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:43:36,732 INFO L375 BasicCegarLoop]: trace histogram [72, 63, 10, 9, 9, 1, 1, 1] [2018-09-23 19:43:36,732 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:43:36,732 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:43:36,732 INFO L82 PathProgramCache]: Analyzing trace with hash -132347917, now seen corresponding path program 10 times [2018-09-23 19:43:36,732 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:43:36,732 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:43:36,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:36,733 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:43:36,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:36,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:37,037 INFO L134 CoverageAnalysis]: Checked inductivity of 5202 backedges. 0 proven. 4698 refuted. 0 times theorem prover too weak. 504 trivial. 0 not checked. [2018-09-23 19:43:37,038 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:43:37,038 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 [2018-09-23 19:43:37,049 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 19:43:37,108 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 19:43:37,109 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:43:37,113 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:43:37,361 INFO L134 CoverageAnalysis]: Checked inductivity of 5202 backedges. 1952 proven. 56 refuted. 0 times theorem prover too weak. 3194 trivial. 0 not checked. [2018-09-23 19:43:37,382 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:43:37,382 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 20 [2018-09-23 19:43:37,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-23 19:43:37,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-23 19:43:37,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-09-23 19:43:37,383 INFO L87 Difference]: Start difference. First operand 167 states and 176 transitions. Second operand 20 states. [2018-09-23 19:43:39,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:43:39,839 INFO L93 Difference]: Finished difference Result 371 states and 402 transitions. [2018-09-23 19:43:39,839 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2018-09-23 19:43:39,839 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 166 [2018-09-23 19:43:39,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:43:39,840 INFO L225 Difference]: With dead ends: 371 [2018-09-23 19:43:39,840 INFO L226 Difference]: Without dead ends: 223 [2018-09-23 19:43:39,844 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3160 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=357, Invalid=9543, Unknown=0, NotChecked=0, Total=9900 [2018-09-23 19:43:39,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-09-23 19:43:39,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 205. [2018-09-23 19:43:39,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-09-23 19:43:39,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 215 transitions. [2018-09-23 19:43:39,869 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 215 transitions. Word has length 166 [2018-09-23 19:43:39,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:43:39,870 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 215 transitions. [2018-09-23 19:43:39,870 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-23 19:43:39,870 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 215 transitions. [2018-09-23 19:43:39,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-09-23 19:43:39,872 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:43:39,872 INFO L375 BasicCegarLoop]: trace histogram [90, 80, 11, 10, 10, 1, 1, 1] [2018-09-23 19:43:39,873 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:43:39,873 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:43:39,873 INFO L82 PathProgramCache]: Analyzing trace with hash -1568317117, now seen corresponding path program 11 times [2018-09-23 19:43:39,873 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:43:39,873 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:43:39,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:39,874 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:43:39,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:39,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:40,961 INFO L134 CoverageAnalysis]: Checked inductivity of 8120 backedges. 0 proven. 7400 refuted. 0 times theorem prover too weak. 720 trivial. 0 not checked. [2018-09-23 19:43:40,961 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:43:40,961 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 [2018-09-23 19:43:40,986 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 19:43:41,196 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2018-09-23 19:43:41,197 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:43:41,201 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:43:41,394 INFO L134 CoverageAnalysis]: Checked inductivity of 8120 backedges. 3774 proven. 72 refuted. 0 times theorem prover too weak. 4274 trivial. 0 not checked. [2018-09-23 19:43:41,414 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:43:41,414 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 22 [2018-09-23 19:43:41,415 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-09-23 19:43:41,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-09-23 19:43:41,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-09-23 19:43:41,416 INFO L87 Difference]: Start difference. First operand 205 states and 215 transitions. Second operand 22 states. [2018-09-23 19:43:45,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:43:45,040 INFO L93 Difference]: Finished difference Result 451 states and 485 transitions. [2018-09-23 19:43:45,040 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2018-09-23 19:43:45,040 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 204 [2018-09-23 19:43:45,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:43:45,042 INFO L225 Difference]: With dead ends: 451 [2018-09-23 19:43:45,042 INFO L226 Difference]: Without dead ends: 267 [2018-09-23 19:43:45,047 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4851 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=437, Invalid=14083, Unknown=0, NotChecked=0, Total=14520 [2018-09-23 19:43:45,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2018-09-23 19:43:45,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 247. [2018-09-23 19:43:45,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2018-09-23 19:43:45,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 258 transitions. [2018-09-23 19:43:45,078 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 258 transitions. Word has length 204 [2018-09-23 19:43:45,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:43:45,078 INFO L480 AbstractCegarLoop]: Abstraction has 247 states and 258 transitions. [2018-09-23 19:43:45,078 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-09-23 19:43:45,079 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 258 transitions. [2018-09-23 19:43:45,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2018-09-23 19:43:45,082 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:43:45,082 INFO L375 BasicCegarLoop]: trace histogram [110, 99, 12, 11, 11, 1, 1, 1] [2018-09-23 19:43:45,082 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:43:45,082 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:43:45,082 INFO L82 PathProgramCache]: Analyzing trace with hash 915329223, now seen corresponding path program 12 times [2018-09-23 19:43:45,083 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:43:45,083 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:43:45,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:45,083 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:43:45,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:45,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:45,455 INFO L134 CoverageAnalysis]: Checked inductivity of 12122 backedges. 0 proven. 11132 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2018-09-23 19:43:45,455 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:43:45,455 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 [2018-09-23 19:43:45,464 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 19:43:50,280 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 21 check-sat command(s) [2018-09-23 19:43:50,281 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:43:50,297 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:43:50,556 INFO L134 CoverageAnalysis]: Checked inductivity of 12122 backedges. 2022 proven. 90 refuted. 0 times theorem prover too weak. 10010 trivial. 0 not checked. [2018-09-23 19:43:50,578 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:43:50,578 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 24 [2018-09-23 19:43:50,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-09-23 19:43:50,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-09-23 19:43:50,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-09-23 19:43:50,579 INFO L87 Difference]: Start difference. First operand 247 states and 258 transitions. Second operand 24 states. [2018-09-23 19:43:54,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:43:54,969 INFO L93 Difference]: Finished difference Result 539 states and 576 transitions. [2018-09-23 19:43:54,969 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2018-09-23 19:43:54,969 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 246 [2018-09-23 19:43:54,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:43:54,971 INFO L225 Difference]: With dead ends: 539 [2018-09-23 19:43:54,971 INFO L226 Difference]: Without dead ends: 315 [2018-09-23 19:43:54,976 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 236 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7140 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=525, Invalid=20067, Unknown=0, NotChecked=0, Total=20592 [2018-09-23 19:43:54,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2018-09-23 19:43:55,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 293. [2018-09-23 19:43:55,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 293 states. [2018-09-23 19:43:55,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 305 transitions. [2018-09-23 19:43:55,012 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 305 transitions. Word has length 246 [2018-09-23 19:43:55,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:43:55,012 INFO L480 AbstractCegarLoop]: Abstraction has 293 states and 305 transitions. [2018-09-23 19:43:55,012 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-09-23 19:43:55,012 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 305 transitions. [2018-09-23 19:43:55,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2018-09-23 19:43:55,014 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:43:55,014 INFO L375 BasicCegarLoop]: trace histogram [132, 120, 13, 12, 12, 1, 1, 1] [2018-09-23 19:43:55,014 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:43:55,015 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:43:55,015 INFO L82 PathProgramCache]: Analyzing trace with hash 154612223, now seen corresponding path program 13 times [2018-09-23 19:43:55,015 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:43:55,015 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:43:55,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:55,016 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:43:55,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:55,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:55,806 INFO L134 CoverageAnalysis]: Checked inductivity of 17448 backedges. 0 proven. 16128 refuted. 0 times theorem prover too weak. 1320 trivial. 0 not checked. [2018-09-23 19:43:55,806 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:43:55,806 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 [2018-09-23 19:43:55,814 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:43:55,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:55,916 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:43:56,077 INFO L134 CoverageAnalysis]: Checked inductivity of 17448 backedges. 0 proven. 16128 refuted. 0 times theorem prover too weak. 1320 trivial. 0 not checked. [2018-09-23 19:43:56,111 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:43:56,112 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-09-23 19:43:56,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-23 19:43:56,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-23 19:43:56,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-09-23 19:43:56,113 INFO L87 Difference]: Start difference. First operand 293 states and 305 transitions. Second operand 15 states. [2018-09-23 19:43:56,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:43:56,503 INFO L93 Difference]: Finished difference Result 341 states and 355 transitions. [2018-09-23 19:43:56,503 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-23 19:43:56,503 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 292 [2018-09-23 19:43:56,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:43:56,505 INFO L225 Difference]: With dead ends: 341 [2018-09-23 19:43:56,505 INFO L226 Difference]: Without dead ends: 339 [2018-09-23 19:43:56,505 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 [2018-09-23 19:43:56,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2018-09-23 19:43:56,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 317. [2018-09-23 19:43:56,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 317 states. [2018-09-23 19:43:56,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 330 transitions. [2018-09-23 19:43:56,550 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 330 transitions. Word has length 292 [2018-09-23 19:43:56,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:43:56,550 INFO L480 AbstractCegarLoop]: Abstraction has 317 states and 330 transitions. [2018-09-23 19:43:56,550 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-23 19:43:56,550 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 330 transitions. [2018-09-23 19:43:56,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2018-09-23 19:43:56,552 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:43:56,552 INFO L375 BasicCegarLoop]: trace histogram [143, 130, 14, 13, 13, 1, 1, 1] [2018-09-23 19:43:56,552 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:43:56,552 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:43:56,553 INFO L82 PathProgramCache]: Analyzing trace with hash -114885159, now seen corresponding path program 14 times [2018-09-23 19:43:56,553 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:43:56,553 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:43:56,553 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:56,554 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:43:56,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:56,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:57,104 INFO L134 CoverageAnalysis]: Checked inductivity of 20488 backedges. 0 proven. 19058 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2018-09-23 19:43:57,104 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:43:57,104 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 [2018-09-23 19:43:57,119 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 19:43:57,226 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 19:43:57,226 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:43:57,232 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:43:57,418 INFO L134 CoverageAnalysis]: Checked inductivity of 20488 backedges. 0 proven. 19058 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2018-09-23 19:43:57,439 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:43:57,439 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-09-23 19:43:57,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-23 19:43:57,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-23 19:43:57,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-09-23 19:43:57,440 INFO L87 Difference]: Start difference. First operand 317 states and 330 transitions. Second operand 16 states. [2018-09-23 19:43:57,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:43:57,831 INFO L93 Difference]: Finished difference Result 365 states and 380 transitions. [2018-09-23 19:43:57,832 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-23 19:43:57,832 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 316 [2018-09-23 19:43:57,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:43:57,834 INFO L225 Difference]: With dead ends: 365 [2018-09-23 19:43:57,834 INFO L226 Difference]: Without dead ends: 363 [2018-09-23 19:43:57,835 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 315 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-09-23 19:43:57,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 363 states. [2018-09-23 19:43:57,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 363 to 341. [2018-09-23 19:43:57,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 341 states. [2018-09-23 19:43:57,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 355 transitions. [2018-09-23 19:43:57,881 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 355 transitions. Word has length 316 [2018-09-23 19:43:57,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:43:57,881 INFO L480 AbstractCegarLoop]: Abstraction has 341 states and 355 transitions. [2018-09-23 19:43:57,882 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-23 19:43:57,882 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 355 transitions. [2018-09-23 19:43:57,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 341 [2018-09-23 19:43:57,883 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:43:57,884 INFO L375 BasicCegarLoop]: trace histogram [154, 140, 15, 14, 14, 1, 1, 1] [2018-09-23 19:43:57,884 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:43:57,884 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:43:57,884 INFO L82 PathProgramCache]: Analyzing trace with hash -1438164045, now seen corresponding path program 15 times [2018-09-23 19:43:57,884 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:43:57,885 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:43:57,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:57,885 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:43:57,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:57,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:58,576 INFO L134 CoverageAnalysis]: Checked inductivity of 23772 backedges. 0 proven. 22232 refuted. 0 times theorem prover too weak. 1540 trivial. 0 not checked. [2018-09-23 19:43:58,576 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:43:58,576 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 [2018-09-23 19:43:58,587 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown