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/array4.i_4.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1cc990c [2018-09-30 23:21:39,241 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-30 23:21:39,243 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-30 23:21:39,254 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-30 23:21:39,255 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-30 23:21:39,256 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-30 23:21:39,257 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-30 23:21:39,258 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-30 23:21:39,260 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-30 23:21:39,261 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-30 23:21:39,262 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-30 23:21:39,262 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-30 23:21:39,263 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-30 23:21:39,264 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-30 23:21:39,265 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-30 23:21:39,266 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-30 23:21:39,267 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-30 23:21:39,269 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-30 23:21:39,273 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-30 23:21:39,278 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-30 23:21:39,279 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-30 23:21:39,282 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-30 23:21:39,286 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-09-30 23:21:39,303 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 [2018-09-30 23:21:39,324 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-30 23:21:39,324 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-30 23:21:39,325 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-30 23:21:39,325 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-09-30 23:21:39,326 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-09-30 23:21:39,326 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-09-30 23:21:39,326 INFO L133 SettingsManager]: * Use SBE=true [2018-09-30 23:21:39,327 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-30 23:21:39,327 INFO L133 SettingsManager]: * sizeof long=4 [2018-09-30 23:21:39,327 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-30 23:21:39,327 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-09-30 23:21:39,327 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-30 23:21:39,328 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-30 23:21:39,328 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-30 23:21:39,328 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-30 23:21:39,328 INFO L133 SettingsManager]: * sizeof long double=12 [2018-09-30 23:21:39,328 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-30 23:21:39,328 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-30 23:21:39,329 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-30 23:21:39,329 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-30 23:21:39,329 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-30 23:21:39,329 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-30 23:21:39,329 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-30 23:21:39,330 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-30 23:21:39,330 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-30 23:21:39,330 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-30 23:21:39,330 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-09-30 23:21:39,330 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-30 23:21:39,331 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-30 23:21:39,331 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-30 23:21:39,382 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-30 23:21:39,403 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-30 23:21:39,409 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-30 23:21:39,411 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-30 23:21:39,411 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-30 23:21:39,412 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/array4.i_4.bpl [2018-09-30 23:21:39,412 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/array4.i_4.bpl' [2018-09-30 23:21:39,481 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-30 23:21:39,485 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-30 23:21:39,485 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-30 23:21:39,486 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-30 23:21:39,486 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-30 23:21:39,506 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 11:21:39" (1/1) ... [2018-09-30 23:21:39,523 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 11:21:39" (1/1) ... [2018-09-30 23:21:39,532 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-30 23:21:39,533 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-30 23:21:39,533 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-30 23:21:39,533 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-30 23:21:39,545 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 11:21:39" (1/1) ... [2018-09-30 23:21:39,545 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 11:21:39" (1/1) ... [2018-09-30 23:21:39,546 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 11:21:39" (1/1) ... [2018-09-30 23:21:39,547 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 11:21:39" (1/1) ... [2018-09-30 23:21:39,550 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 11:21:39" (1/1) ... [2018-09-30 23:21:39,553 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 11:21:39" (1/1) ... [2018-09-30 23:21:39,554 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 11:21:39" (1/1) ... [2018-09-30 23:21:39,556 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-30 23:21:39,557 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-30 23:21:39,557 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-30 23:21:39,557 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-30 23:21:39,558 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 11:21:39" (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 [2018-09-30 23:21:39,635 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-30 23:21:39,635 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-30 23:21:39,897 INFO L348 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-30 23:21:39,897 INFO L202 PluginConnector]: Adding new model array4.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.09 11:21:39 BoogieIcfgContainer [2018-09-30 23:21:39,898 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-30 23:21:39,899 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-30 23:21:39,899 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-30 23:21:39,902 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-30 23:21:39,902 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 11:21:39" (1/2) ... [2018-09-30 23:21:39,903 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48e88430 and model type array4.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.09 11:21:39, skipping insertion in model container [2018-09-30 23:21:39,904 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "array4.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.09 11:21:39" (2/2) ... [2018-09-30 23:21:39,905 INFO L112 eAbstractionObserver]: Analyzing ICFG array4.i_4.bpl [2018-09-30 23:21:39,915 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-30 23:21:39,924 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-30 23:21:39,977 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-30 23:21:39,978 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-30 23:21:39,978 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-30 23:21:39,978 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-30 23:21:39,978 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-30 23:21:39,979 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-30 23:21:39,979 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-30 23:21:39,979 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-30 23:21:39,979 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-30 23:21:39,995 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states. [2018-09-30 23:21:40,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-09-30 23:21:40,002 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:40,003 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-09-30 23:21:40,005 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:40,011 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:40,011 INFO L82 PathProgramCache]: Analyzing trace with hash 889539531, now seen corresponding path program 1 times [2018-09-30 23:21:40,014 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:40,015 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:40,073 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:40,073 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 23:21:40,073 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:40,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:40,173 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 23:21:40,175 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-30 23:21:40,175 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-30 23:21:40,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-30 23:21:40,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-30 23:21:40,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-30 23:21:40,196 INFO L87 Difference]: Start difference. First operand 9 states. Second operand 3 states. [2018-09-30 23:21:40,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:40,255 INFO L93 Difference]: Finished difference Result 17 states and 21 transitions. [2018-09-30 23:21:40,255 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-30 23:21:40,257 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2018-09-30 23:21:40,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:40,268 INFO L225 Difference]: With dead ends: 17 [2018-09-30 23:21:40,268 INFO L226 Difference]: Without dead ends: 11 [2018-09-30 23:21:40,273 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 [2018-09-30 23:21:40,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-30 23:21:40,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-09-30 23:21:40,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-09-30 23:21:40,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2018-09-30 23:21:40,311 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 6 [2018-09-30 23:21:40,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:40,312 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2018-09-30 23:21:40,312 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-30 23:21:40,312 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2018-09-30 23:21:40,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-30 23:21:40,313 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:40,313 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2018-09-30 23:21:40,313 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:40,313 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:40,314 INFO L82 PathProgramCache]: Analyzing trace with hash 1897191999, now seen corresponding path program 1 times [2018-09-30 23:21:40,314 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:40,314 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:40,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:40,315 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 23:21:40,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:40,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:40,382 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-09-30 23:21:40,382 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:40,382 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 [2018-09-30 23:21:40,392 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 23:21:40,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:40,431 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:40,453 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-09-30 23:21:40,490 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 23:21:40,490 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-09-30 23:21:40,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-30 23:21:40,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-30 23:21:40,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-09-30 23:21:40,492 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 4 states. [2018-09-30 23:21:40,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:40,699 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2018-09-30 23:21:40,700 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-30 23:21:40,700 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 10 [2018-09-30 23:21:40,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:40,701 INFO L225 Difference]: With dead ends: 21 [2018-09-30 23:21:40,701 INFO L226 Difference]: Without dead ends: 15 [2018-09-30 23:21:40,702 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-09-30 23:21:40,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-09-30 23:21:40,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-09-30 23:21:40,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-09-30 23:21:40,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-09-30 23:21:40,707 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2018-09-30 23:21:40,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:40,707 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-09-30 23:21:40,708 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-30 23:21:40,708 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-09-30 23:21:40,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-30 23:21:40,709 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:40,709 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1] [2018-09-30 23:21:40,709 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:40,709 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:40,710 INFO L82 PathProgramCache]: Analyzing trace with hash 87273139, now seen corresponding path program 2 times [2018-09-30 23:21:40,710 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:40,710 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:40,711 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:40,711 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 23:21:40,711 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:40,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:40,949 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-09-30 23:21:40,949 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:40,950 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 [2018-09-30 23:21:40,960 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 23:21:40,997 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 23:21:40,997 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 23:21:40,999 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:41,006 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-09-30 23:21:41,036 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 23:21:41,036 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-09-30 23:21:41,037 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-30 23:21:41,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-30 23:21:41,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-09-30 23:21:41,038 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2018-09-30 23:21:41,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:41,160 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2018-09-30 23:21:41,160 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-30 23:21:41,161 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2018-09-30 23:21:41,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:41,161 INFO L225 Difference]: With dead ends: 27 [2018-09-30 23:21:41,162 INFO L226 Difference]: Without dead ends: 19 [2018-09-30 23:21:41,162 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-09-30 23:21:41,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-30 23:21:41,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-09-30 23:21:41,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-30 23:21:41,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-09-30 23:21:41,169 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2018-09-30 23:21:41,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:41,169 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-09-30 23:21:41,169 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-30 23:21:41,170 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-09-30 23:21:41,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-09-30 23:21:41,171 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:41,171 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1] [2018-09-30 23:21:41,172 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:41,172 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:41,172 INFO L82 PathProgramCache]: Analyzing trace with hash -1310275289, now seen corresponding path program 3 times [2018-09-30 23:21:41,173 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:41,173 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:41,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:41,174 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 23:21:41,176 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:41,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:41,411 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-09-30 23:21:41,412 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:41,412 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 [2018-09-30 23:21:41,429 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 23:21:41,503 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-30 23:21:41,504 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 23:21:41,507 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:41,520 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-09-30 23:21:41,555 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 23:21:41,555 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-09-30 23:21:41,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-30 23:21:41,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-30 23:21:41,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-09-30 23:21:41,560 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 6 states. [2018-09-30 23:21:41,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:41,666 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2018-09-30 23:21:41,666 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-30 23:21:41,667 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2018-09-30 23:21:41,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:41,667 INFO L225 Difference]: With dead ends: 33 [2018-09-30 23:21:41,669 INFO L226 Difference]: Without dead ends: 23 [2018-09-30 23:21:41,670 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-09-30 23:21:41,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-09-30 23:21:41,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-09-30 23:21:41,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-09-30 23:21:41,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-09-30 23:21:41,680 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2018-09-30 23:21:41,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:41,680 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-09-30 23:21:41,681 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-30 23:21:41,681 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-09-30 23:21:41,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-09-30 23:21:41,682 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:41,682 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1] [2018-09-30 23:21:41,682 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:41,682 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:41,683 INFO L82 PathProgramCache]: Analyzing trace with hash 1731406235, now seen corresponding path program 4 times [2018-09-30 23:21:41,683 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:41,683 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:41,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:41,684 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 23:21:41,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:41,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:41,812 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2018-09-30 23:21:41,812 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:41,812 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 [2018-09-30 23:21:41,826 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 23:21:41,869 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 23:21:41,870 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 23:21:41,872 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:41,879 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2018-09-30 23:21:41,903 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 23:21:41,903 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-09-30 23:21:41,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-30 23:21:41,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-30 23:21:41,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-09-30 23:21:41,904 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 7 states. [2018-09-30 23:21:41,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:41,971 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2018-09-30 23:21:41,973 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-30 23:21:41,973 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2018-09-30 23:21:41,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:41,974 INFO L225 Difference]: With dead ends: 39 [2018-09-30 23:21:41,974 INFO L226 Difference]: Without dead ends: 27 [2018-09-30 23:21:41,975 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-09-30 23:21:41,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-30 23:21:41,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-09-30 23:21:41,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-09-30 23:21:41,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-09-30 23:21:41,981 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 22 [2018-09-30 23:21:41,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:41,981 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-09-30 23:21:41,981 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-30 23:21:41,981 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-09-30 23:21:41,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-09-30 23:21:41,982 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:41,983 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1] [2018-09-30 23:21:41,983 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:41,983 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:41,983 INFO L82 PathProgramCache]: Analyzing trace with hash 77451279, now seen corresponding path program 5 times [2018-09-30 23:21:41,983 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:41,984 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:41,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:41,985 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 23:21:41,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:42,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:42,180 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-09-30 23:21:42,180 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:42,180 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 [2018-09-30 23:21:42,190 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 23:21:42,219 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-30 23:21:42,219 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 23:21:42,222 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:42,231 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-09-30 23:21:42,257 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 23:21:42,257 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-09-30 23:21:42,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-30 23:21:42,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-30 23:21:42,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-09-30 23:21:42,258 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2018-09-30 23:21:42,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:42,341 INFO L93 Difference]: Finished difference Result 45 states and 48 transitions. [2018-09-30 23:21:42,341 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-30 23:21:42,341 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-09-30 23:21:42,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:42,342 INFO L225 Difference]: With dead ends: 45 [2018-09-30 23:21:42,342 INFO L226 Difference]: Without dead ends: 31 [2018-09-30 23:21:42,343 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-09-30 23:21:42,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-09-30 23:21:42,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-09-30 23:21:42,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-09-30 23:21:42,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2018-09-30 23:21:42,349 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 26 [2018-09-30 23:21:42,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:42,350 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2018-09-30 23:21:42,350 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-30 23:21:42,350 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2018-09-30 23:21:42,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-09-30 23:21:42,351 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:42,351 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1] [2018-09-30 23:21:42,352 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:42,352 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:42,352 INFO L82 PathProgramCache]: Analyzing trace with hash 422296707, now seen corresponding path program 6 times [2018-09-30 23:21:42,352 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:42,352 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:42,353 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:42,354 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 23:21:42,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:42,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:42,471 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2018-09-30 23:21:42,472 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:42,472 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 [2018-09-30 23:21:42,497 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 23:21:42,538 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-30 23:21:42,538 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 23:21:42,542 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:42,551 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2018-09-30 23:21:42,582 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 23:21:42,582 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 9 [2018-09-30 23:21:42,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-30 23:21:42,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-30 23:21:42,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-09-30 23:21:42,584 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 9 states. [2018-09-30 23:21:42,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:42,782 INFO L93 Difference]: Finished difference Result 51 states and 54 transitions. [2018-09-30 23:21:42,783 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-30 23:21:42,783 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 30 [2018-09-30 23:21:42,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:42,784 INFO L225 Difference]: With dead ends: 51 [2018-09-30 23:21:42,784 INFO L226 Difference]: Without dead ends: 35 [2018-09-30 23:21:42,785 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-09-30 23:21:42,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-09-30 23:21:42,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-09-30 23:21:42,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-09-30 23:21:42,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2018-09-30 23:21:42,792 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 30 [2018-09-30 23:21:42,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:42,792 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2018-09-30 23:21:42,792 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-30 23:21:42,792 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2018-09-30 23:21:42,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-09-30 23:21:42,793 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:42,794 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1] [2018-09-30 23:21:42,794 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:42,794 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:42,794 INFO L82 PathProgramCache]: Analyzing trace with hash -1553862921, now seen corresponding path program 7 times [2018-09-30 23:21:42,794 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:42,795 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:42,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:42,796 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 23:21:42,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:42,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:43,232 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2018-09-30 23:21:43,233 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:43,233 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 [2018-09-30 23:21:43,251 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 23:21:43,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:43,292 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:43,307 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2018-09-30 23:21:43,334 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 23:21:43,334 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-09-30 23:21:43,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-30 23:21:43,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-30 23:21:43,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-09-30 23:21:43,335 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 10 states. [2018-09-30 23:21:43,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:43,450 INFO L93 Difference]: Finished difference Result 57 states and 60 transitions. [2018-09-30 23:21:43,451 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-30 23:21:43,451 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 34 [2018-09-30 23:21:43,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:43,452 INFO L225 Difference]: With dead ends: 57 [2018-09-30 23:21:43,453 INFO L226 Difference]: Without dead ends: 39 [2018-09-30 23:21:43,453 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-09-30 23:21:43,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-09-30 23:21:43,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-09-30 23:21:43,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-09-30 23:21:43,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-09-30 23:21:43,459 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 34 [2018-09-30 23:21:43,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:43,460 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-09-30 23:21:43,460 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-30 23:21:43,460 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-09-30 23:21:43,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-09-30 23:21:43,461 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:43,461 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1] [2018-09-30 23:21:43,462 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:43,462 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:43,462 INFO L82 PathProgramCache]: Analyzing trace with hash -783980693, now seen corresponding path program 8 times [2018-09-30 23:21:43,462 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:43,463 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:43,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:43,464 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 23:21:43,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:43,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:43,665 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2018-09-30 23:21:43,665 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:43,665 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 [2018-09-30 23:21:43,680 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 23:21:43,725 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 23:21:43,726 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 23:21:43,730 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:43,740 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2018-09-30 23:21:43,763 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 23:21:43,764 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-09-30 23:21:43,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-30 23:21:43,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-30 23:21:43,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-09-30 23:21:43,765 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 11 states. [2018-09-30 23:21:44,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:44,175 INFO L93 Difference]: Finished difference Result 63 states and 66 transitions. [2018-09-30 23:21:44,175 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-30 23:21:44,176 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 38 [2018-09-30 23:21:44,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:44,176 INFO L225 Difference]: With dead ends: 63 [2018-09-30 23:21:44,177 INFO L226 Difference]: Without dead ends: 43 [2018-09-30 23:21:44,177 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-09-30 23:21:44,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-09-30 23:21:44,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-09-30 23:21:44,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-09-30 23:21:44,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2018-09-30 23:21:44,184 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 38 [2018-09-30 23:21:44,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:44,185 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2018-09-30 23:21:44,185 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-30 23:21:44,185 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2018-09-30 23:21:44,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-09-30 23:21:44,186 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:44,186 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1] [2018-09-30 23:21:44,187 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:44,187 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:44,187 INFO L82 PathProgramCache]: Analyzing trace with hash -1067768353, now seen corresponding path program 9 times [2018-09-30 23:21:44,187 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:44,187 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:44,188 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:44,188 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 23:21:44,188 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:44,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:44,388 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2018-09-30 23:21:44,388 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:44,390 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 [2018-09-30 23:21:44,402 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 23:21:44,551 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-30 23:21:44,552 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 23:21:44,555 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:44,567 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2018-09-30 23:21:44,603 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 23:21:44,604 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-09-30 23:21:44,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-30 23:21:44,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-30 23:21:44,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-09-30 23:21:44,606 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 12 states. [2018-09-30 23:21:44,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:44,794 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2018-09-30 23:21:44,796 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-30 23:21:44,796 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 42 [2018-09-30 23:21:44,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:44,797 INFO L225 Difference]: With dead ends: 69 [2018-09-30 23:21:44,798 INFO L226 Difference]: Without dead ends: 47 [2018-09-30 23:21:44,798 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-09-30 23:21:44,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-09-30 23:21:44,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-09-30 23:21:44,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-09-30 23:21:44,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2018-09-30 23:21:44,805 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 42 [2018-09-30 23:21:44,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:44,806 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2018-09-30 23:21:44,806 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-30 23:21:44,806 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2018-09-30 23:21:44,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-09-30 23:21:44,807 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:44,807 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1] [2018-09-30 23:21:44,808 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:44,808 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:44,808 INFO L82 PathProgramCache]: Analyzing trace with hash 1034431059, now seen corresponding path program 10 times [2018-09-30 23:21:44,808 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:44,808 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:44,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:44,809 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 23:21:44,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:44,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:44,994 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-09-30 23:21:44,995 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:44,995 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 [2018-09-30 23:21:45,003 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 23:21:45,049 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 23:21:45,050 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 23:21:45,052 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:45,065 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-09-30 23:21:45,088 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 23:21:45,089 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-09-30 23:21:45,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-30 23:21:45,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-30 23:21:45,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-09-30 23:21:45,090 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 13 states. [2018-09-30 23:21:45,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:45,171 INFO L93 Difference]: Finished difference Result 75 states and 78 transitions. [2018-09-30 23:21:45,172 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-30 23:21:45,172 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 46 [2018-09-30 23:21:45,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:45,174 INFO L225 Difference]: With dead ends: 75 [2018-09-30 23:21:45,174 INFO L226 Difference]: Without dead ends: 51 [2018-09-30 23:21:45,175 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-09-30 23:21:45,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-09-30 23:21:45,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-09-30 23:21:45,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-09-30 23:21:45,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-09-30 23:21:45,181 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 46 [2018-09-30 23:21:45,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:45,181 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-09-30 23:21:45,182 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-30 23:21:45,182 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-09-30 23:21:45,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-09-30 23:21:45,183 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:45,183 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1] [2018-09-30 23:21:45,183 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:45,183 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:45,183 INFO L82 PathProgramCache]: Analyzing trace with hash -2051967801, now seen corresponding path program 11 times [2018-09-30 23:21:45,184 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:45,184 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:45,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:45,184 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 23:21:45,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:45,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:45,365 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-09-30 23:21:45,365 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:45,365 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 [2018-09-30 23:21:45,375 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 23:21:45,425 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-30 23:21:45,425 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 23:21:45,427 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:45,442 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-09-30 23:21:45,463 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 23:21:45,464 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-09-30 23:21:45,464 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-30 23:21:45,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-30 23:21:45,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-09-30 23:21:45,465 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 14 states. [2018-09-30 23:21:45,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:45,531 INFO L93 Difference]: Finished difference Result 81 states and 84 transitions. [2018-09-30 23:21:45,531 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-30 23:21:45,532 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 50 [2018-09-30 23:21:45,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:45,533 INFO L225 Difference]: With dead ends: 81 [2018-09-30 23:21:45,533 INFO L226 Difference]: Without dead ends: 55 [2018-09-30 23:21:45,534 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-09-30 23:21:45,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-09-30 23:21:45,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-09-30 23:21:45,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-09-30 23:21:45,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2018-09-30 23:21:45,542 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 50 [2018-09-30 23:21:45,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:45,542 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2018-09-30 23:21:45,542 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-30 23:21:45,542 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2018-09-30 23:21:45,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-09-30 23:21:45,543 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:45,543 INFO L375 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1] [2018-09-30 23:21:45,544 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:45,544 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:45,544 INFO L82 PathProgramCache]: Analyzing trace with hash 75236667, now seen corresponding path program 12 times [2018-09-30 23:21:45,544 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:45,544 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:45,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:45,552 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 23:21:45,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:45,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:45,872 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2018-09-30 23:21:45,873 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:45,873 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 [2018-09-30 23:21:45,881 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 23:21:45,966 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-30 23:21:45,966 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 23:21:45,970 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:45,986 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2018-09-30 23:21:46,018 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 23:21:46,018 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 15 [2018-09-30 23:21:46,019 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-30 23:21:46,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-30 23:21:46,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-09-30 23:21:46,020 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 15 states. [2018-09-30 23:21:46,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:46,115 INFO L93 Difference]: Finished difference Result 87 states and 90 transitions. [2018-09-30 23:21:46,115 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-30 23:21:46,115 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 54 [2018-09-30 23:21:46,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:46,116 INFO L225 Difference]: With dead ends: 87 [2018-09-30 23:21:46,116 INFO L226 Difference]: Without dead ends: 59 [2018-09-30 23:21:46,117 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-09-30 23:21:46,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-09-30 23:21:46,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-09-30 23:21:46,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-09-30 23:21:46,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2018-09-30 23:21:46,123 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 54 [2018-09-30 23:21:46,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:46,124 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2018-09-30 23:21:46,124 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-30 23:21:46,124 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2018-09-30 23:21:46,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-09-30 23:21:46,125 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:46,125 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1] [2018-09-30 23:21:46,125 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:46,125 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:46,126 INFO L82 PathProgramCache]: Analyzing trace with hash 361552815, now seen corresponding path program 13 times [2018-09-30 23:21:46,126 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:46,126 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:46,126 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:46,127 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 23:21:46,127 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:46,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:46,374 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2018-09-30 23:21:46,374 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:46,374 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 [2018-09-30 23:21:46,384 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 23:21:46,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:46,419 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:46,433 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2018-09-30 23:21:46,463 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 23:21:46,463 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-09-30 23:21:46,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-30 23:21:46,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-30 23:21:46,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-09-30 23:21:46,464 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand 16 states. [2018-09-30 23:21:46,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:46,553 INFO L93 Difference]: Finished difference Result 93 states and 96 transitions. [2018-09-30 23:21:46,553 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-30 23:21:46,553 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 58 [2018-09-30 23:21:46,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:46,554 INFO L225 Difference]: With dead ends: 93 [2018-09-30 23:21:46,554 INFO L226 Difference]: Without dead ends: 63 [2018-09-30 23:21:46,555 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-09-30 23:21:46,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-09-30 23:21:46,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-09-30 23:21:46,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-09-30 23:21:46,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-09-30 23:21:46,562 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 58 [2018-09-30 23:21:46,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:46,562 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-09-30 23:21:46,562 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-30 23:21:46,562 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-09-30 23:21:46,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-09-30 23:21:46,563 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:46,563 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1] [2018-09-30 23:21:46,564 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:46,564 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:46,564 INFO L82 PathProgramCache]: Analyzing trace with hash -1008142301, now seen corresponding path program 14 times [2018-09-30 23:21:46,564 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:46,564 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:46,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:46,565 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 23:21:46,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:46,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:46,773 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-09-30 23:21:46,774 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:46,774 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 [2018-09-30 23:21:46,787 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 23:21:46,842 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 23:21:46,843 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 23:21:46,849 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:46,882 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-09-30 23:21:46,906 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 23:21:46,906 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-09-30 23:21:46,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-30 23:21:46,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-30 23:21:46,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-09-30 23:21:46,907 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 17 states. [2018-09-30 23:21:47,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:47,006 INFO L93 Difference]: Finished difference Result 99 states and 102 transitions. [2018-09-30 23:21:47,006 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-30 23:21:47,006 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 62 [2018-09-30 23:21:47,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:47,007 INFO L225 Difference]: With dead ends: 99 [2018-09-30 23:21:47,007 INFO L226 Difference]: Without dead ends: 67 [2018-09-30 23:21:47,009 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-09-30 23:21:47,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-09-30 23:21:47,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-09-30 23:21:47,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-09-30 23:21:47,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2018-09-30 23:21:47,015 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 62 [2018-09-30 23:21:47,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:47,016 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2018-09-30 23:21:47,016 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-30 23:21:47,016 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2018-09-30 23:21:47,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-09-30 23:21:47,017 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:47,017 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1] [2018-09-30 23:21:47,017 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:47,018 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:47,018 INFO L82 PathProgramCache]: Analyzing trace with hash -1978312041, now seen corresponding path program 15 times [2018-09-30 23:21:47,018 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:47,018 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:47,019 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:47,019 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 23:21:47,019 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:47,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:48,282 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2018-09-30 23:21:48,283 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:48,283 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 [2018-09-30 23:21:48,293 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 23:21:48,382 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-30 23:21:48,382 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 23:21:48,385 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:48,402 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2018-09-30 23:21:48,432 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 23:21:48,432 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-09-30 23:21:48,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-30 23:21:48,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-30 23:21:48,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-09-30 23:21:48,434 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 18 states. [2018-09-30 23:21:48,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:48,789 INFO L93 Difference]: Finished difference Result 105 states and 108 transitions. [2018-09-30 23:21:48,789 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-30 23:21:48,790 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 66 [2018-09-30 23:21:48,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:48,791 INFO L225 Difference]: With dead ends: 105 [2018-09-30 23:21:48,791 INFO L226 Difference]: Without dead ends: 71 [2018-09-30 23:21:48,792 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-09-30 23:21:48,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2018-09-30 23:21:48,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2018-09-30 23:21:48,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-09-30 23:21:48,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2018-09-30 23:21:48,798 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 66 [2018-09-30 23:21:48,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:48,798 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2018-09-30 23:21:48,798 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-30 23:21:48,798 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2018-09-30 23:21:48,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-09-30 23:21:48,799 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:48,799 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 1, 1, 1, 1] [2018-09-30 23:21:48,799 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:48,800 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:48,800 INFO L82 PathProgramCache]: Analyzing trace with hash 303497995, now seen corresponding path program 16 times [2018-09-30 23:21:48,800 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:48,800 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:48,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:48,801 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 23:21:48,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:48,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:49,186 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2018-09-30 23:21:49,187 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:49,187 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 23:21:49,198 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 23:21:49,232 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 23:21:49,233 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 23:21:49,235 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:49,245 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2018-09-30 23:21:49,265 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 23:21:49,265 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-09-30 23:21:49,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-30 23:21:49,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-30 23:21:49,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-09-30 23:21:49,267 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand 19 states. [2018-09-30 23:21:49,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:49,508 INFO L93 Difference]: Finished difference Result 111 states and 114 transitions. [2018-09-30 23:21:49,509 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-30 23:21:49,509 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 70 [2018-09-30 23:21:49,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:49,510 INFO L225 Difference]: With dead ends: 111 [2018-09-30 23:21:49,510 INFO L226 Difference]: Without dead ends: 75 [2018-09-30 23:21:49,511 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-09-30 23:21:49,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-09-30 23:21:49,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-09-30 23:21:49,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-09-30 23:21:49,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2018-09-30 23:21:49,516 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 70 [2018-09-30 23:21:49,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:49,516 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2018-09-30 23:21:49,516 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-30 23:21:49,517 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2018-09-30 23:21:49,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-09-30 23:21:49,517 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:49,517 INFO L375 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 1, 1, 1, 1] [2018-09-30 23:21:49,518 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:49,518 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:49,518 INFO L82 PathProgramCache]: Analyzing trace with hash -177016449, now seen corresponding path program 17 times [2018-09-30 23:21:49,518 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:49,518 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:49,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:49,519 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 23:21:49,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:49,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:49,888 INFO L134 CoverageAnalysis]: Checked inductivity of 612 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2018-09-30 23:21:49,888 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:49,889 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 23:21:49,897 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 23:21:49,964 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-09-30 23:21:49,965 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 23:21:49,967 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:49,980 INFO L134 CoverageAnalysis]: Checked inductivity of 612 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2018-09-30 23:21:50,004 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 23:21:50,004 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-09-30 23:21:50,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-30 23:21:50,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-30 23:21:50,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-09-30 23:21:50,005 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 20 states. [2018-09-30 23:21:50,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:50,085 INFO L93 Difference]: Finished difference Result 117 states and 120 transitions. [2018-09-30 23:21:50,085 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-09-30 23:21:50,085 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 74 [2018-09-30 23:21:50,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:50,086 INFO L225 Difference]: With dead ends: 117 [2018-09-30 23:21:50,087 INFO L226 Difference]: Without dead ends: 79 [2018-09-30 23:21:50,087 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-09-30 23:21:50,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-09-30 23:21:50,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-09-30 23:21:50,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-09-30 23:21:50,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-09-30 23:21:50,094 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 74 [2018-09-30 23:21:50,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:50,094 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-09-30 23:21:50,095 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-30 23:21:50,095 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-09-30 23:21:50,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-09-30 23:21:50,096 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:50,096 INFO L375 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 1, 1, 1, 1] [2018-09-30 23:21:50,096 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:50,096 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:50,096 INFO L82 PathProgramCache]: Analyzing trace with hash 2100176371, now seen corresponding path program 18 times [2018-09-30 23:21:50,097 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:50,097 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:50,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:50,098 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 23:21:50,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:50,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:50,457 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2018-09-30 23:21:50,457 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:50,457 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 23:21:50,466 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 23:21:50,551 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-09-30 23:21:50,552 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 23:21:50,554 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:50,569 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2018-09-30 23:21:50,599 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 23:21:50,599 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21] total 21 [2018-09-30 23:21:50,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-09-30 23:21:50,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-09-30 23:21:50,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-09-30 23:21:50,601 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 21 states. [2018-09-30 23:21:50,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:50,681 INFO L93 Difference]: Finished difference Result 123 states and 126 transitions. [2018-09-30 23:21:50,682 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-09-30 23:21:50,682 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 78 [2018-09-30 23:21:50,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:50,683 INFO L225 Difference]: With dead ends: 123 [2018-09-30 23:21:50,683 INFO L226 Difference]: Without dead ends: 83 [2018-09-30 23:21:50,684 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-09-30 23:21:50,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-09-30 23:21:50,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2018-09-30 23:21:50,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-09-30 23:21:50,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2018-09-30 23:21:50,688 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 78 [2018-09-30 23:21:50,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:50,689 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2018-09-30 23:21:50,689 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-09-30 23:21:50,689 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2018-09-30 23:21:50,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-09-30 23:21:50,690 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:50,690 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 1, 1, 1, 1] [2018-09-30 23:21:50,690 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:50,690 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:50,691 INFO L82 PathProgramCache]: Analyzing trace with hash 1640865895, now seen corresponding path program 19 times [2018-09-30 23:21:50,691 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:50,691 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:50,692 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:50,692 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 23:21:50,692 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:50,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:51,499 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2018-09-30 23:21:51,499 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:51,499 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 23:21:51,509 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 23:21:51,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:51,547 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:51,567 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2018-09-30 23:21:51,590 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 23:21:51,590 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 21 [2018-09-30 23:21:51,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-09-30 23:21:51,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-09-30 23:21:51,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-09-30 23:21:51,592 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand 22 states. [2018-09-30 23:21:51,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:51,731 INFO L93 Difference]: Finished difference Result 129 states and 132 transitions. [2018-09-30 23:21:51,732 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-09-30 23:21:51,732 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 82 [2018-09-30 23:21:51,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:51,733 INFO L225 Difference]: With dead ends: 129 [2018-09-30 23:21:51,733 INFO L226 Difference]: Without dead ends: 87 [2018-09-30 23:21:51,734 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-09-30 23:21:51,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-09-30 23:21:51,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-09-30 23:21:51,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-09-30 23:21:51,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-09-30 23:21:51,740 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 82 [2018-09-30 23:21:51,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:51,740 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-09-30 23:21:51,740 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-09-30 23:21:51,741 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-09-30 23:21:51,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-09-30 23:21:51,742 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:51,742 INFO L375 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 1, 1, 1, 1] [2018-09-30 23:21:51,743 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:51,743 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:51,743 INFO L82 PathProgramCache]: Analyzing trace with hash -1957273381, now seen corresponding path program 20 times [2018-09-30 23:21:51,743 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:51,743 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:51,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:51,744 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 23:21:51,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:51,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:52,287 INFO L134 CoverageAnalysis]: Checked inductivity of 840 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-09-30 23:21:52,287 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:52,288 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 23:21:52,296 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 23:21:52,357 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 23:21:52,357 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 23:21:52,360 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:52,375 INFO L134 CoverageAnalysis]: Checked inductivity of 840 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-09-30 23:21:52,408 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 23:21:52,408 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 22 [2018-09-30 23:21:52,409 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-09-30 23:21:52,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-09-30 23:21:52,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-09-30 23:21:52,410 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 23 states. [2018-09-30 23:21:52,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 23:21:52,617 INFO L93 Difference]: Finished difference Result 135 states and 138 transitions. [2018-09-30 23:21:52,619 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-09-30 23:21:52,619 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 86 [2018-09-30 23:21:52,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 23:21:52,620 INFO L225 Difference]: With dead ends: 135 [2018-09-30 23:21:52,620 INFO L226 Difference]: Without dead ends: 91 [2018-09-30 23:21:52,621 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-09-30 23:21:52,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-09-30 23:21:52,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2018-09-30 23:21:52,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-09-30 23:21:52,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2018-09-30 23:21:52,625 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 86 [2018-09-30 23:21:52,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 23:21:52,626 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2018-09-30 23:21:52,626 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-09-30 23:21:52,626 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2018-09-30 23:21:52,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-09-30 23:21:52,626 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 23:21:52,627 INFO L375 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 1, 1, 1, 1] [2018-09-30 23:21:52,627 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 23:21:52,627 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 23:21:52,627 INFO L82 PathProgramCache]: Analyzing trace with hash -783456433, now seen corresponding path program 21 times [2018-09-30 23:21:52,627 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 23:21:52,627 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 23:21:52,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:52,628 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 23:21:52,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 23:21:52,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 23:21:52,937 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2018-09-30 23:21:52,938 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 23:21:52,938 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 23:21:52,946 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 23:21:53,115 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-09-30 23:21:53,115 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 23:21:53,119 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 23:21:53,163 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2018-09-30 23:21:53,165 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-30 23:21:53,229 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-09-30 23:21:53,229 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:10, output treesize:9 [2018-09-30 23:21:58,846 INFO L303 Elim1Store]: Index analysis took 108 ms [2018-09-30 23:21:59,041 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 9 select indices, 9 select index equivalence classes, 16 disjoint index pairs (out of 36 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 54 treesize of output 289 [2018-09-30 23:21:59,044 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 28