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/functions1.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-9f4048f [2018-10-04 12:22:37,280 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-04 12:22:37,282 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-04 12:22:37,295 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-04 12:22:37,295 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-04 12:22:37,296 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-04 12:22:37,297 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-04 12:22:37,299 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-04 12:22:37,301 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-04 12:22:37,302 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-04 12:22:37,303 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-04 12:22:37,303 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-04 12:22:37,304 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-04 12:22:37,305 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-04 12:22:37,306 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-04 12:22:37,307 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-04 12:22:37,308 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-04 12:22:37,310 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-04 12:22:37,313 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-04 12:22:37,314 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-04 12:22:37,319 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-04 12:22:37,323 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-04 12:22:37,328 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-04 12:22:37,339 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf [2018-10-04 12:22:37,355 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-04 12:22:37,356 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-04 12:22:37,357 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-04 12:22:37,358 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-04 12:22:37,358 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-04 12:22:37,359 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-04 12:22:37,359 INFO L133 SettingsManager]: * Use SBE=true [2018-10-04 12:22:37,360 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-04 12:22:37,360 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-04 12:22:37,360 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-04 12:22:37,360 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-04 12:22:37,361 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-04 12:22:37,361 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-04 12:22:37,361 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-04 12:22:37,361 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-04 12:22:37,361 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-04 12:22:37,362 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-04 12:22:37,362 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-04 12:22:37,363 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-04 12:22:37,363 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-04 12:22:37,363 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-04 12:22:37,363 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-04 12:22:37,363 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-04 12:22:37,364 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-04 12:22:37,364 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-04 12:22:37,364 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-04 12:22:37,364 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-04 12:22:37,364 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-04 12:22:37,364 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-04 12:22:37,365 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-04 12:22:37,422 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-04 12:22:37,434 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-04 12:22:37,438 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-04 12:22:37,440 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-10-04 12:22:37,440 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-10-04 12:22:37,441 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/functions1.i_3.bpl [2018-10-04 12:22:37,441 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/functions1.i_3.bpl' [2018-10-04 12:22:37,495 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-04 12:22:37,496 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-10-04 12:22:37,497 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-04 12:22:37,497 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-04 12:22:37,498 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-04 12:22:37,519 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:22:37" (1/1) ... [2018-10-04 12:22:37,532 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:22:37" (1/1) ... [2018-10-04 12:22:37,539 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-04 12:22:37,540 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-04 12:22:37,540 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-04 12:22:37,540 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-04 12:22:37,553 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:22:37" (1/1) ... [2018-10-04 12:22:37,553 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:22:37" (1/1) ... [2018-10-04 12:22:37,554 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:22:37" (1/1) ... [2018-10-04 12:22:37,554 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:22:37" (1/1) ... [2018-10-04 12:22:37,557 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:22:37" (1/1) ... [2018-10-04 12:22:37,559 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:22:37" (1/1) ... [2018-10-04 12:22:37,560 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:22:37" (1/1) ... [2018-10-04 12:22:37,561 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-04 12:22:37,562 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-04 12:22:37,562 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-04 12:22:37,563 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-04 12:22:37,564 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:22:37" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-04 12:22:37,648 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-04 12:22:37,648 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-04 12:22:37,867 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-04 12:22:37,868 INFO L202 PluginConnector]: Adding new model functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.10 12:22:37 BoogieIcfgContainer [2018-10-04 12:22:37,868 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-04 12:22:37,869 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-04 12:22:37,869 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-04 12:22:37,873 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-04 12:22:37,873 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 12:22:37" (1/2) ... [2018-10-04 12:22:37,874 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3cd14937 and model type functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.10 12:22:37, skipping insertion in model container [2018-10-04 12:22:37,874 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.10 12:22:37" (2/2) ... [2018-10-04 12:22:37,876 INFO L112 eAbstractionObserver]: Analyzing ICFG functions1.i_3.bpl [2018-10-04 12:22:37,888 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-04 12:22:37,899 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-04 12:22:37,957 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-04 12:22:37,958 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-10-04 12:22:37,958 INFO L382 AbstractCegarLoop]: Hoare is true [2018-10-04 12:22:37,958 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-04 12:22:37,959 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-04 12:22:37,959 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-04 12:22:37,959 INFO L386 AbstractCegarLoop]: Difference is false [2018-10-04 12:22:37,959 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-04 12:22:37,959 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-04 12:22:37,980 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-10-04 12:22:37,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-10-04 12:22:37,988 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:22:37,989 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-10-04 12:22:37,991 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:22:37,997 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:22:37,997 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2018-10-04 12:22:38,000 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:22:38,000 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:22:38,049 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:22:38,049 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:22:38,049 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:22:38,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:22:38,177 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:22:38,179 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-04 12:22:38,179 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-04 12:22:38,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-04 12:22:38,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-04 12:22:38,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-04 12:22:38,200 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-10-04 12:22:38,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:22:38,255 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-10-04 12:22:38,255 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-04 12:22:38,257 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-10-04 12:22:38,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:22:38,269 INFO L225 Difference]: With dead ends: 11 [2018-10-04 12:22:38,269 INFO L226 Difference]: Without dead ends: 7 [2018-10-04 12:22:38,272 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-04 12:22:38,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-10-04 12:22:38,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-10-04 12:22:38,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-10-04 12:22:38,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-10-04 12:22:38,327 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-10-04 12:22:38,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:22:38,327 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-10-04 12:22:38,328 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-04 12:22:38,328 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-10-04 12:22:38,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-04 12:22:38,328 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:22:38,329 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-10-04 12:22:38,329 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:22:38,329 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:22:38,329 INFO L82 PathProgramCache]: Analyzing trace with hash 889591169, now seen corresponding path program 1 times [2018-10-04 12:22:38,330 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:22:38,330 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:22:38,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:22:38,331 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:22:38,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:22:38,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:22:38,524 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:22:38,524 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:22:38,525 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:22:38,549 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:22:38,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:22:38,584 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:22:38,657 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:22:38,678 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:22:38,679 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-10-04 12:22:38,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-04 12:22:38,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-04 12:22:38,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-04 12:22:38,680 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 4 states. [2018-10-04 12:22:38,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:22:38,720 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-10-04 12:22:38,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-04 12:22:38,721 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-10-04 12:22:38,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:22:38,722 INFO L225 Difference]: With dead ends: 11 [2018-10-04 12:22:38,722 INFO L226 Difference]: Without dead ends: 9 [2018-10-04 12:22:38,723 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-04 12:22:38,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-10-04 12:22:38,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-10-04 12:22:38,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-10-04 12:22:38,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-10-04 12:22:38,726 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-10-04 12:22:38,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:22:38,727 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-10-04 12:22:38,727 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-04 12:22:38,727 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-10-04 12:22:38,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-10-04 12:22:38,728 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:22:38,728 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1] [2018-10-04 12:22:38,728 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:22:38,729 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:22:38,729 INFO L82 PathProgramCache]: Analyzing trace with hash 198673595, now seen corresponding path program 2 times [2018-10-04 12:22:38,729 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:22:38,729 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:22:38,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:22:38,730 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:22:38,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:22:38,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:22:38,898 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:22:38,899 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:22:38,899 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:22:38,912 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-04 12:22:38,940 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-04 12:22:38,940 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:22:38,942 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:22:38,969 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:22:38,990 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:22:38,990 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-10-04 12:22:38,991 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-04 12:22:38,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-04 12:22:38,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-04 12:22:38,991 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 5 states. [2018-10-04 12:22:39,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:22:39,045 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-10-04 12:22:39,045 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-04 12:22:39,045 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2018-10-04 12:22:39,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:22:39,046 INFO L225 Difference]: With dead ends: 13 [2018-10-04 12:22:39,046 INFO L226 Difference]: Without dead ends: 11 [2018-10-04 12:22:39,047 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-04 12:22:39,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-10-04 12:22:39,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-10-04 12:22:39,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-10-04 12:22:39,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-10-04 12:22:39,051 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-10-04 12:22:39,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:22:39,052 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-10-04 12:22:39,052 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-04 12:22:39,052 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-10-04 12:22:39,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-04 12:22:39,053 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:22:39,053 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1] [2018-10-04 12:22:39,053 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:22:39,053 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:22:39,054 INFO L82 PathProgramCache]: Analyzing trace with hash 1946815861, now seen corresponding path program 3 times [2018-10-04 12:22:39,054 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:22:39,054 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:22:39,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:22:39,055 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:22:39,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:22:39,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:22:39,438 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:22:39,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:22:39,439 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:22:39,450 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-04 12:22:39,507 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-04 12:22:39,507 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:22:39,509 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:22:39,533 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:22:39,554 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:22:39,554 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-04 12:22:39,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-04 12:22:39,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-04 12:22:39,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-04 12:22:39,556 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 6 states. [2018-10-04 12:22:39,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:22:39,616 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-10-04 12:22:39,617 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-04 12:22:39,617 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2018-10-04 12:22:39,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:22:39,618 INFO L225 Difference]: With dead ends: 15 [2018-10-04 12:22:39,618 INFO L226 Difference]: Without dead ends: 13 [2018-10-04 12:22:39,619 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-04 12:22:39,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-04 12:22:39,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-04 12:22:39,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-04 12:22:39,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-10-04 12:22:39,624 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-10-04 12:22:39,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:22:39,624 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-10-04 12:22:39,624 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-04 12:22:39,624 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-10-04 12:22:39,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-04 12:22:39,625 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:22:39,625 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2018-10-04 12:22:39,626 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:22:39,626 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:22:39,626 INFO L82 PathProgramCache]: Analyzing trace with hash -1715646545, now seen corresponding path program 4 times [2018-10-04 12:22:39,626 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:22:39,627 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:22:39,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:22:39,628 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:22:39,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:22:39,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:22:39,874 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:22:39,874 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:22:39,875 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:22:39,882 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-04 12:22:39,907 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-04 12:22:39,907 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:22:39,911 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:22:39,961 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:22:39,981 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:22:39,982 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-10-04 12:22:39,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-04 12:22:39,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-04 12:22:39,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-04 12:22:39,983 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 7 states. [2018-10-04 12:22:40,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:22:40,047 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-10-04 12:22:40,048 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-04 12:22:40,048 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2018-10-04 12:22:40,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:22:40,049 INFO L225 Difference]: With dead ends: 17 [2018-10-04 12:22:40,049 INFO L226 Difference]: Without dead ends: 15 [2018-10-04 12:22:40,049 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-04 12:22:40,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-04 12:22:40,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-04 12:22:40,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-04 12:22:40,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-04 12:22:40,054 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-10-04 12:22:40,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:22:40,054 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-04 12:22:40,055 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-04 12:22:40,055 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-04 12:22:40,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-04 12:22:40,055 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:22:40,056 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1] [2018-10-04 12:22:40,056 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:22:40,056 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:22:40,056 INFO L82 PathProgramCache]: Analyzing trace with hash 531164009, now seen corresponding path program 5 times [2018-10-04 12:22:40,056 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:22:40,057 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:22:40,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:22:40,058 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:22:40,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:22:40,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:22:40,275 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:22:40,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:22:40,276 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 [2018-10-04 12:22:40,285 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-04 12:22:40,623 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-04 12:22:40,623 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:22:40,627 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:22:40,658 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:22:40,684 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:22:40,685 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-04 12:22:40,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-04 12:22:40,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-04 12:22:40,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-04 12:22:40,686 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2018-10-04 12:22:41,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:22:41,021 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-04 12:22:41,022 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-04 12:22:41,022 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2018-10-04 12:22:41,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:22:41,023 INFO L225 Difference]: With dead ends: 19 [2018-10-04 12:22:41,023 INFO L226 Difference]: Without dead ends: 17 [2018-10-04 12:22:41,024 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-04 12:22:41,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-10-04 12:22:41,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-10-04 12:22:41,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-04 12:22:41,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-04 12:22:41,029 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-10-04 12:22:41,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:22:41,029 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-04 12:22:41,029 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-04 12:22:41,029 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-04 12:22:41,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-04 12:22:41,030 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:22:41,030 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1] [2018-10-04 12:22:41,031 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:22:41,031 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:22:41,031 INFO L82 PathProgramCache]: Analyzing trace with hash -652443485, now seen corresponding path program 6 times [2018-10-04 12:22:41,031 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:22:41,031 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:22:41,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:22:41,032 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:22:41,033 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:22:41,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:22:41,342 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:22:41,343 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:22:41,343 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:22:41,359 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-04 12:22:41,391 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-04 12:22:41,391 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:22:41,395 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:22:41,437 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:22:41,457 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:22:41,458 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-10-04 12:22:41,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-04 12:22:41,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-04 12:22:41,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-04 12:22:41,459 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2018-10-04 12:22:41,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:22:41,566 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-04 12:22:41,570 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-04 12:22:41,571 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2018-10-04 12:22:41,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:22:41,571 INFO L225 Difference]: With dead ends: 21 [2018-10-04 12:22:41,572 INFO L226 Difference]: Without dead ends: 19 [2018-10-04 12:22:41,572 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-04 12:22:41,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-04 12:22:41,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-04 12:22:41,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-04 12:22:41,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-10-04 12:22:41,577 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-10-04 12:22:41,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:22:41,577 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-10-04 12:22:41,577 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-04 12:22:41,578 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-10-04 12:22:41,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-04 12:22:41,578 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:22:41,578 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1] [2018-10-04 12:22:41,579 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:22:41,579 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:22:41,579 INFO L82 PathProgramCache]: Analyzing trace with hash 67088221, now seen corresponding path program 7 times [2018-10-04 12:22:41,579 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:22:41,579 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:22:41,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:22:41,580 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:22:41,581 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:22:41,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:22:41,929 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:22:41,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:22:41,929 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:22:41,938 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:22:41,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:22:41,963 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:22:41,988 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:22:42,009 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:22:42,009 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-04 12:22:42,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-04 12:22:42,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-04 12:22:42,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-04 12:22:42,011 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2018-10-04 12:22:42,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:22:42,150 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-04 12:22:42,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-04 12:22:42,150 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2018-10-04 12:22:42,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:22:42,151 INFO L225 Difference]: With dead ends: 23 [2018-10-04 12:22:42,151 INFO L226 Difference]: Without dead ends: 21 [2018-10-04 12:22:42,152 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-04 12:22:42,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-04 12:22:42,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-10-04 12:22:42,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-04 12:22:42,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-10-04 12:22:42,158 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-10-04 12:22:42,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:22:42,158 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-10-04 12:22:42,158 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-04 12:22:42,158 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-10-04 12:22:42,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-04 12:22:42,159 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:22:42,159 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1] [2018-10-04 12:22:42,159 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:22:42,160 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:22:42,160 INFO L82 PathProgramCache]: Analyzing trace with hash 47323031, now seen corresponding path program 8 times [2018-10-04 12:22:42,160 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:22:42,160 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:22:42,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:22:42,161 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:22:42,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:22:42,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:22:42,511 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:22:42,511 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:22:42,512 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:22:42,520 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-04 12:22:42,558 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-04 12:22:42,558 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:22:42,561 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:22:42,583 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:22:42,604 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:22:42,605 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-10-04 12:22:42,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-04 12:22:42,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-04 12:22:42,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-04 12:22:42,606 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 11 states. [2018-10-04 12:22:42,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:22:42,730 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-04 12:22:42,731 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-04 12:22:42,731 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-10-04 12:22:42,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:22:42,732 INFO L225 Difference]: With dead ends: 25 [2018-10-04 12:22:42,732 INFO L226 Difference]: Without dead ends: 23 [2018-10-04 12:22:42,733 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-04 12:22:42,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-10-04 12:22:42,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-10-04 12:22:42,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-04 12:22:42,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-10-04 12:22:42,739 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-10-04 12:22:42,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:22:42,740 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-10-04 12:22:42,740 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-04 12:22:42,740 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-10-04 12:22:42,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-04 12:22:42,741 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:22:42,741 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1] [2018-10-04 12:22:42,741 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:22:42,741 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:22:42,742 INFO L82 PathProgramCache]: Analyzing trace with hash -1767155375, now seen corresponding path program 9 times [2018-10-04 12:22:42,742 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:22:42,742 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:22:42,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:22:42,743 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:22:42,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:22:42,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:22:43,107 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:22:43,107 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:22:43,109 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:22:43,119 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-04 12:23:02,897 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-04 12:23:02,897 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:23:02,929 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:23:02,954 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:23:02,976 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:23:02,976 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-10-04 12:23:02,976 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-04 12:23:02,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-04 12:23:02,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-04 12:23:02,977 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 12 states. [2018-10-04 12:23:03,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:23:03,116 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-04 12:23:03,117 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-04 12:23:03,117 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2018-10-04 12:23:03,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:23:03,118 INFO L225 Difference]: With dead ends: 27 [2018-10-04 12:23:03,118 INFO L226 Difference]: Without dead ends: 25 [2018-10-04 12:23:03,119 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-04 12:23:03,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-04 12:23:03,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-04 12:23:03,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-04 12:23:03,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-10-04 12:23:03,124 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-10-04 12:23:03,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:23:03,124 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-10-04 12:23:03,125 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-04 12:23:03,125 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-10-04 12:23:03,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-04 12:23:03,125 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:23:03,126 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1] [2018-10-04 12:23:03,126 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:23:03,126 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:23:03,126 INFO L82 PathProgramCache]: Analyzing trace with hash -1724181365, now seen corresponding path program 10 times [2018-10-04 12:23:03,126 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:23:03,126 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:23:03,127 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:23:03,127 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:23:03,127 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:23:03,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:23:03,443 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:23:03,444 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:23:03,444 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:23:03,452 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-04 12:23:03,483 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-04 12:23:03,483 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:23:03,486 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:23:03,540 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:23:03,560 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:23:03,560 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-10-04 12:23:03,560 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-04 12:23:03,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-04 12:23:03,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-04 12:23:03,561 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 13 states. [2018-10-04 12:23:03,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:23:03,833 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-10-04 12:23:03,833 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-04 12:23:03,834 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2018-10-04 12:23:03,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:23:03,835 INFO L225 Difference]: With dead ends: 29 [2018-10-04 12:23:03,835 INFO L226 Difference]: Without dead ends: 27 [2018-10-04 12:23:03,836 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-04 12:23:03,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-04 12:23:03,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-10-04 12:23:03,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-04 12:23:03,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-10-04 12:23:03,842 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-10-04 12:23:03,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:23:03,843 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-10-04 12:23:03,843 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-04 12:23:03,843 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-10-04 12:23:03,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-04 12:23:03,844 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:23:03,844 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1] [2018-10-04 12:23:03,844 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:23:03,845 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:23:03,845 INFO L82 PathProgramCache]: Analyzing trace with hash 919136581, now seen corresponding path program 11 times [2018-10-04 12:23:03,845 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:23:03,845 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:23:03,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:23:03,846 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:23:03,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:23:03,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:23:04,441 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:23:04,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:23:04,442 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:23:04,449 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-04 12:24:04,446 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-04 12:24:04,447 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:24:04,511 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:24:04,555 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:24:04,560 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:24:04,560 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-04 12:24:04,562 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-04 12:24:04,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-04 12:24:04,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-04 12:24:04,563 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 14 states. [2018-10-04 12:24:04,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:24:04,858 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-10-04 12:24:04,861 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-04 12:24:04,861 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 26 [2018-10-04 12:24:04,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:24:04,862 INFO L225 Difference]: With dead ends: 31 [2018-10-04 12:24:04,862 INFO L226 Difference]: Without dead ends: 29 [2018-10-04 12:24:04,862 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-04 12:24:04,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-04 12:24:04,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-10-04 12:24:04,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-04 12:24:04,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-10-04 12:24:04,867 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-10-04 12:24:04,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:24:04,868 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-10-04 12:24:04,868 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-04 12:24:04,868 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-10-04 12:24:04,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-04 12:24:04,869 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:24:04,869 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1] [2018-10-04 12:24:04,869 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:24:04,869 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:24:04,869 INFO L82 PathProgramCache]: Analyzing trace with hash -1472956545, now seen corresponding path program 12 times [2018-10-04 12:24:04,870 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:24:04,870 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:24:04,871 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:24:04,871 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:24:04,871 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:24:04,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:24:05,395 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:24:05,396 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:24:05,396 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:24:05,411 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-04 12:24:25,821 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-04 12:24:25,822 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:24:25,882 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:24:25,942 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:24:25,963 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:24:25,963 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-10-04 12:24:25,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-04 12:24:25,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-04 12:24:25,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-04 12:24:25,964 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2018-10-04 12:24:26,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:24:26,143 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-04 12:24:26,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-04 12:24:26,144 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2018-10-04 12:24:26,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:24:26,145 INFO L225 Difference]: With dead ends: 33 [2018-10-04 12:24:26,145 INFO L226 Difference]: Without dead ends: 31 [2018-10-04 12:24:26,146 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-04 12:24:26,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-04 12:24:26,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-10-04 12:24:26,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-04 12:24:26,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-10-04 12:24:26,152 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-10-04 12:24:26,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:24:26,152 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-10-04 12:24:26,152 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-04 12:24:26,152 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-10-04 12:24:26,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-04 12:24:26,153 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:24:26,153 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1] [2018-10-04 12:24:26,153 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:24:26,154 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:24:26,154 INFO L82 PathProgramCache]: Analyzing trace with hash 1828020025, now seen corresponding path program 13 times [2018-10-04 12:24:26,154 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:24:26,154 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:24:26,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:24:26,155 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:24:26,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:24:26,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:24:26,507 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:24:26,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:24:26,508 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:24:26,516 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:24:26,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:24:26,550 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:24:26,572 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:24:26,604 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:24:26,604 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-04 12:24:26,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-04 12:24:26,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-04 12:24:26,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-04 12:24:26,605 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 16 states. [2018-10-04 12:24:26,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:24:26,822 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-10-04 12:24:26,823 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-04 12:24:26,823 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 30 [2018-10-04 12:24:26,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:24:26,824 INFO L225 Difference]: With dead ends: 35 [2018-10-04 12:24:26,824 INFO L226 Difference]: Without dead ends: 33 [2018-10-04 12:24:26,825 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-04 12:24:26,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-04 12:24:26,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-10-04 12:24:26,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-04 12:24:26,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-04 12:24:26,831 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-10-04 12:24:26,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:24:26,831 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-04 12:24:26,831 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-04 12:24:26,832 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-04 12:24:26,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-04 12:24:26,832 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:24:26,833 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1] [2018-10-04 12:24:26,833 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:24:26,833 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:24:26,833 INFO L82 PathProgramCache]: Analyzing trace with hash 85672051, now seen corresponding path program 14 times [2018-10-04 12:24:26,833 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:24:26,833 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:24:26,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:24:26,834 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 12:24:26,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:24:26,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:24:27,199 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:24:27,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:24:27,200 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:24:27,210 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-04 12:24:27,244 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-04 12:24:27,244 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:24:27,248 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:24:27,269 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:24:27,290 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:24:27,290 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-10-04 12:24:27,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-04 12:24:27,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-04 12:24:27,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-04 12:24:27,291 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 17 states. [2018-10-04 12:24:27,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:24:27,676 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-10-04 12:24:27,676 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-04 12:24:27,676 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2018-10-04 12:24:27,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:24:27,677 INFO L225 Difference]: With dead ends: 37 [2018-10-04 12:24:27,677 INFO L226 Difference]: Without dead ends: 35 [2018-10-04 12:24:27,679 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-04 12:24:27,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-10-04 12:24:27,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-10-04 12:24:27,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-04 12:24:27,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-10-04 12:24:27,684 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-10-04 12:24:27,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:24:27,684 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-10-04 12:24:27,684 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-04 12:24:27,684 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-10-04 12:24:27,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-04 12:24:27,685 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:24:27,685 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1] [2018-10-04 12:24:27,685 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:24:27,686 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:24:27,686 INFO L82 PathProgramCache]: Analyzing trace with hash 726514477, now seen corresponding path program 15 times [2018-10-04 12:24:27,686 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:24:27,686 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:24:27,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:24:27,687 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:24:27,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:24:27,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:24:28,278 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:24:28,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:24:28,279 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 12:24:28,287 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-04 12:24:54,060 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-04 12:24:54,060 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:24:54,123 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:24:54,155 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:24:54,176 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:24:54,176 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-04 12:24:54,176 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-04 12:24:54,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-04 12:24:54,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-04 12:24:54,177 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 18 states. [2018-10-04 12:24:54,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:24:54,387 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-04 12:24:54,389 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-04 12:24:54,389 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 34 [2018-10-04 12:24:54,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:24:54,390 INFO L225 Difference]: With dead ends: 39 [2018-10-04 12:24:54,390 INFO L226 Difference]: Without dead ends: 37 [2018-10-04 12:24:54,390 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-04 12:24:54,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-04 12:24:54,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-10-04 12:24:54,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-04 12:24:54,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-10-04 12:24:54,395 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-10-04 12:24:54,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:24:54,396 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-10-04 12:24:54,396 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-04 12:24:54,396 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-10-04 12:24:54,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-04 12:24:54,397 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:24:54,397 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1] [2018-10-04 12:24:54,397 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:24:54,397 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:24:54,398 INFO L82 PathProgramCache]: Analyzing trace with hash -1899204761, now seen corresponding path program 16 times [2018-10-04 12:24:54,398 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:24:54,398 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:24:54,398 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:24:54,399 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:24:54,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:24:54,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:24:55,378 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:24:55,379 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:24:55,379 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 [2018-10-04 12:24:55,386 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-04 12:24:55,420 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-04 12:24:55,420 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:24:55,424 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:24:55,454 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:24:55,478 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:24:55,478 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-10-04 12:24:55,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-04 12:24:55,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-04 12:24:55,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-04 12:24:55,479 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 19 states. [2018-10-04 12:24:55,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:24:55,817 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-10-04 12:24:55,820 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-04 12:24:55,820 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 36 [2018-10-04 12:24:55,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:24:55,821 INFO L225 Difference]: With dead ends: 41 [2018-10-04 12:24:55,821 INFO L226 Difference]: Without dead ends: 39 [2018-10-04 12:24:55,822 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-04 12:24:55,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-04 12:24:55,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-10-04 12:24:55,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-04 12:24:55,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-10-04 12:24:55,832 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-10-04 12:24:55,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:24:55,835 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-10-04 12:24:55,835 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-04 12:24:55,835 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-10-04 12:24:55,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-04 12:24:55,836 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:24:55,836 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1] [2018-10-04 12:24:55,836 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:24:55,837 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:24:55,837 INFO L82 PathProgramCache]: Analyzing trace with hash 225377569, now seen corresponding path program 17 times [2018-10-04 12:24:55,837 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:24:55,837 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:24:55,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:24:55,838 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:24:55,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:24:55,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:24:56,968 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:24:56,968 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:24:56,969 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 [2018-10-04 12:24:56,975 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-04 12:26:38,348 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-04 12:26:38,348 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 12:26:38,691 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 12:26:38,741 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:26:38,771 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 12:26:38,771 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-10-04 12:26:38,772 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-04 12:26:38,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-04 12:26:38,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-04 12:26:38,772 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 20 states. [2018-10-04 12:26:39,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 12:26:39,167 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-10-04 12:26:39,167 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-04 12:26:39,167 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 38 [2018-10-04 12:26:39,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 12:26:39,168 INFO L225 Difference]: With dead ends: 43 [2018-10-04 12:26:39,168 INFO L226 Difference]: Without dead ends: 41 [2018-10-04 12:26:39,169 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-04 12:26:39,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-10-04 12:26:39,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-10-04 12:26:39,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-04 12:26:39,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-10-04 12:26:39,175 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-10-04 12:26:39,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 12:26:39,175 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-10-04 12:26:39,176 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-04 12:26:39,176 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-10-04 12:26:39,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-04 12:26:39,176 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 12:26:39,177 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1] [2018-10-04 12:26:39,177 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 12:26:39,177 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 12:26:39,177 INFO L82 PathProgramCache]: Analyzing trace with hash 1839531099, now seen corresponding path program 18 times [2018-10-04 12:26:39,177 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 12:26:39,178 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 12:26:39,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:39,179 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 12:26:39,179 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 12:26:39,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 12:26:39,586 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 12:26:39,586 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 12:26:39,586 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 [2018-10-04 12:26:39,606 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown