java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/programs/recursive/regression/bpl/Ackermann_Main.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-b8c145f [2019-08-05 11:07:36,876 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-08-05 11:07:36,878 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-08-05 11:07:36,893 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-08-05 11:07:36,893 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-08-05 11:07:36,894 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-08-05 11:07:36,896 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-08-05 11:07:36,898 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-08-05 11:07:36,899 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-08-05 11:07:36,900 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-08-05 11:07:36,901 INFO L181 SettingsManager]: Resetting Symbolic Interpretation preferences to default values [2019-08-05 11:07:36,902 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-08-05 11:07:36,902 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-08-05 11:07:36,903 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-08-05 11:07:36,904 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-08-05 11:07:36,905 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-08-05 11:07:36,906 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-08-05 11:07:36,907 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-08-05 11:07:36,909 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-08-05 11:07:36,911 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-08-05 11:07:36,912 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-08-05 11:07:36,913 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-08-05 11:07:36,914 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-08-05 11:07:36,915 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-08-05 11:07:36,917 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-08-05 11:07:36,918 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-08-05 11:07:36,918 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-08-05 11:07:36,919 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-08-05 11:07:36,919 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-08-05 11:07:36,920 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-08-05 11:07:36,920 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-08-05 11:07:36,921 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-08-05 11:07:36,922 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-08-05 11:07:36,923 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-08-05 11:07:36,924 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-08-05 11:07:36,924 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-08-05 11:07:36,925 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-08-05 11:07:36,925 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-08-05 11:07:36,925 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-08-05 11:07:36,926 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-08-05 11:07:36,927 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-08-05 11:07:36,953 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-08-05 11:07:36,968 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-08-05 11:07:36,972 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-08-05 11:07:36,974 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2019-08-05 11:07:36,974 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2019-08-05 11:07:36,975 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/recursive/regression/bpl/Ackermann_Main.bpl [2019-08-05 11:07:36,976 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/recursive/regression/bpl/Ackermann_Main.bpl' [2019-08-05 11:07:37,013 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-08-05 11:07:37,014 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-08-05 11:07:37,015 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-08-05 11:07:37,015 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-08-05 11:07:37,016 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-08-05 11:07:37,033 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "Ackermann_Main.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 11:07:37" (1/1) ... [2019-08-05 11:07:37,042 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "Ackermann_Main.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 11:07:37" (1/1) ... [2019-08-05 11:07:37,048 WARN L165 Inliner]: Program contained no entry procedure! [2019-08-05 11:07:37,048 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2019-08-05 11:07:37,049 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2019-08-05 11:07:37,051 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-08-05 11:07:37,051 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-08-05 11:07:37,052 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-08-05 11:07:37,052 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-08-05 11:07:37,062 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "Ackermann_Main.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 11:07:37" (1/1) ... [2019-08-05 11:07:37,062 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "Ackermann_Main.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 11:07:37" (1/1) ... [2019-08-05 11:07:37,063 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "Ackermann_Main.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 11:07:37" (1/1) ... [2019-08-05 11:07:37,063 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "Ackermann_Main.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 11:07:37" (1/1) ... [2019-08-05 11:07:37,066 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "Ackermann_Main.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 11:07:37" (1/1) ... [2019-08-05 11:07:37,070 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "Ackermann_Main.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 11:07:37" (1/1) ... [2019-08-05 11:07:37,071 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "Ackermann_Main.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 11:07:37" (1/1) ... [2019-08-05 11:07:37,072 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-08-05 11:07:37,073 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-08-05 11:07:37,073 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-08-05 11:07:37,073 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-08-05 11:07:37,076 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "Ackermann_Main.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 11:07:37" (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:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2019-08-05 11:07:37,142 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2019-08-05 11:07:37,142 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2019-08-05 11:07:37,142 INFO L130 BoogieDeclarations]: Found specification of procedure Main [2019-08-05 11:07:37,143 INFO L138 BoogieDeclarations]: Found implementation of procedure Main [2019-08-05 11:07:37,214 WARN L731 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2019-08-05 11:07:37,345 INFO L275 CfgBuilder]: Using library mode [2019-08-05 11:07:37,346 INFO L283 CfgBuilder]: Removed 0 assume(true) statements. [2019-08-05 11:07:37,347 INFO L202 PluginConnector]: Adding new model Ackermann_Main.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.08 11:07:37 BoogieIcfgContainer [2019-08-05 11:07:37,347 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-08-05 11:07:37,349 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-08-05 11:07:37,349 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-08-05 11:07:37,352 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-08-05 11:07:37,352 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "Ackermann_Main.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 05.08 11:07:37" (1/2) ... [2019-08-05 11:07:37,353 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@286580ab and model type Ackermann_Main.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.08 11:07:37, skipping insertion in model container [2019-08-05 11:07:37,353 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "Ackermann_Main.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.08 11:07:37" (2/2) ... [2019-08-05 11:07:37,355 INFO L109 eAbstractionObserver]: Analyzing ICFG Ackermann_Main.bpl [2019-08-05 11:07:37,365 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2019-08-05 11:07:37,373 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2019-08-05 11:07:37,388 INFO L252 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2019-08-05 11:07:37,413 INFO L128 ementStrategyFactory]: Using default assertion order modulation [2019-08-05 11:07:37,414 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-08-05 11:07:37,414 INFO L378 AbstractCegarLoop]: Hoare is false [2019-08-05 11:07:37,414 INFO L379 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2019-08-05 11:07:37,414 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-08-05 11:07:37,414 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-08-05 11:07:37,415 INFO L382 AbstractCegarLoop]: Difference is false [2019-08-05 11:07:37,415 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-08-05 11:07:37,415 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-08-05 11:07:37,429 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states. [2019-08-05 11:07:37,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2019-08-05 11:07:37,439 INFO L391 BasicCegarLoop]: Found error trace [2019-08-05 11:07:37,440 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1] [2019-08-05 11:07:37,443 INFO L418 AbstractCegarLoop]: === Iteration 1 === [ackermannErr0ENSURES_VIOLATIONPOST_CONDITION, MainErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2019-08-05 11:07:37,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-08-05 11:07:37,449 INFO L82 PathProgramCache]: Analyzing trace with hash 29897, now seen corresponding path program 1 times [2019-08-05 11:07:37,494 INFO L69 tionRefinementEngine]: Using refinement strategy FixedRefinementStrategy [2019-08-05 11:07:37,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-08-05 11:07:37,523 INFO L256 TraceCheckSpWp]: Trace formula consists of 9 conjuncts, 3 conjunts are in the unsatisfiable core [2019-08-05 11:07:37,528 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-08-05 11:07:37,660 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-08-05 11:07:37,663 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-08-05 11:07:37,663 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-08-05 11:07:37,668 INFO L454 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-08-05 11:07:37,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-08-05 11:07:37,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-08-05 11:07:37,694 INFO L87 Difference]: Start difference. First operand 13 states. Second operand 4 states. [2019-08-05 11:07:37,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-08-05 11:07:37,907 INFO L93 Difference]: Finished difference Result 13 states and 17 transitions. [2019-08-05 11:07:37,908 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-08-05 11:07:37,909 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 3 [2019-08-05 11:07:37,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-08-05 11:07:37,919 INFO L225 Difference]: With dead ends: 13 [2019-08-05 11:07:37,919 INFO L226 Difference]: Without dead ends: 12 [2019-08-05 11:07:37,921 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-08-05 11:07:37,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-08-05 11:07:37,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2019-08-05 11:07:37,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2019-08-05 11:07:37,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 15 transitions. [2019-08-05 11:07:37,961 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 15 transitions. Word has length 3 [2019-08-05 11:07:37,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-08-05 11:07:37,961 INFO L475 AbstractCegarLoop]: Abstraction has 11 states and 15 transitions. [2019-08-05 11:07:37,962 INFO L476 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-08-05 11:07:37,962 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 15 transitions. [2019-08-05 11:07:37,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-08-05 11:07:37,964 INFO L391 BasicCegarLoop]: Found error trace [2019-08-05 11:07:37,964 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2019-08-05 11:07:37,964 INFO L418 AbstractCegarLoop]: === Iteration 2 === [ackermannErr0ENSURES_VIOLATIONPOST_CONDITION, MainErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2019-08-05 11:07:37,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-08-05 11:07:37,965 INFO L82 PathProgramCache]: Analyzing trace with hash 1546075819, now seen corresponding path program 1 times [2019-08-05 11:07:37,966 INFO L69 tionRefinementEngine]: Using refinement strategy FixedRefinementStrategy [2019-08-05 11:07:37,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-08-05 11:07:37,980 INFO L256 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 3 conjunts are in the unsatisfiable core [2019-08-05 11:07:37,985 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-08-05 11:07:38,136 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-08-05 11:07:38,137 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-08-05 11:07:38,137 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-08-05 11:07:38,139 INFO L454 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-08-05 11:07:38,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-08-05 11:07:38,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-08-05 11:07:38,140 INFO L87 Difference]: Start difference. First operand 11 states and 15 transitions. Second operand 4 states. [2019-08-05 11:07:38,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-08-05 11:07:38,409 INFO L93 Difference]: Finished difference Result 20 states and 31 transitions. [2019-08-05 11:07:38,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-08-05 11:07:38,409 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2019-08-05 11:07:38,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-08-05 11:07:38,411 INFO L225 Difference]: With dead ends: 20 [2019-08-05 11:07:38,411 INFO L226 Difference]: Without dead ends: 19 [2019-08-05 11:07:38,412 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-08-05 11:07:38,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-08-05 11:07:38,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-08-05 11:07:38,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-08-05 11:07:38,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 30 transitions. [2019-08-05 11:07:38,422 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 30 transitions. Word has length 6 [2019-08-05 11:07:38,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-08-05 11:07:38,423 INFO L475 AbstractCegarLoop]: Abstraction has 19 states and 30 transitions. [2019-08-05 11:07:38,423 INFO L476 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-08-05 11:07:38,423 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 30 transitions. [2019-08-05 11:07:38,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-08-05 11:07:38,425 INFO L391 BasicCegarLoop]: Found error trace [2019-08-05 11:07:38,425 INFO L399 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2019-08-05 11:07:38,425 INFO L418 AbstractCegarLoop]: === Iteration 3 === [ackermannErr0ENSURES_VIOLATIONPOST_CONDITION, MainErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2019-08-05 11:07:38,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-08-05 11:07:38,426 INFO L82 PathProgramCache]: Analyzing trace with hash 1782689015, now seen corresponding path program 1 times [2019-08-05 11:07:38,441 INFO L69 tionRefinementEngine]: Using refinement strategy FixedRefinementStrategy [2019-08-05 11:07:38,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-08-05 11:07:38,454 INFO L256 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 3 conjunts are in the unsatisfiable core [2019-08-05 11:07:38,455 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-08-05 11:07:38,518 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-08-05 11:07:38,519 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-08-05 11:07:38,519 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-08-05 11:07:38,519 INFO L454 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-08-05 11:07:38,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-08-05 11:07:38,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-08-05 11:07:38,520 INFO L87 Difference]: Start difference. First operand 19 states and 30 transitions. Second operand 4 states. [2019-08-05 11:07:38,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-08-05 11:07:38,698 INFO L93 Difference]: Finished difference Result 24 states and 37 transitions. [2019-08-05 11:07:38,698 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-08-05 11:07:38,698 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2019-08-05 11:07:38,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-08-05 11:07:38,700 INFO L225 Difference]: With dead ends: 24 [2019-08-05 11:07:38,700 INFO L226 Difference]: Without dead ends: 23 [2019-08-05 11:07:38,701 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-08-05 11:07:38,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-08-05 11:07:38,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-08-05 11:07:38,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-08-05 11:07:38,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 36 transitions. [2019-08-05 11:07:38,710 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 36 transitions. Word has length 12 [2019-08-05 11:07:38,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-08-05 11:07:38,710 INFO L475 AbstractCegarLoop]: Abstraction has 23 states and 36 transitions. [2019-08-05 11:07:38,710 INFO L476 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-08-05 11:07:38,711 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 36 transitions. [2019-08-05 11:07:38,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-08-05 11:07:38,712 INFO L391 BasicCegarLoop]: Found error trace [2019-08-05 11:07:38,713 INFO L399 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-08-05 11:07:38,713 INFO L418 AbstractCegarLoop]: === Iteration 4 === [ackermannErr0ENSURES_VIOLATIONPOST_CONDITION, MainErr0ENSURES_VIOLATIONPOST_CONDITION]=== [2019-08-05 11:07:38,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-08-05 11:07:38,714 INFO L82 PathProgramCache]: Analyzing trace with hash -630428347, now seen corresponding path program 1 times [2019-08-05 11:07:38,714 INFO L69 tionRefinementEngine]: Using refinement strategy FixedRefinementStrategy [2019-08-05 11:07:38,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-08-05 11:07:38,737 INFO L256 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 5 conjunts are in the unsatisfiable core [2019-08-05 11:07:38,739 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-08-05 11:07:38,854 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2019-08-05 11:07:38,854 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-08-05 11:07:38,854 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-08-05 11:07:38,855 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-08-05 11:07:38,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-08-05 11:07:38,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-08-05 11:07:38,856 INFO L87 Difference]: Start difference. First operand 23 states and 36 transitions. Second operand 5 states. [2019-08-05 11:07:38,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-08-05 11:07:38,969 INFO L93 Difference]: Finished difference Result 24 states and 37 transitions. [2019-08-05 11:07:38,980 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-08-05 11:07:38,980 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 23 [2019-08-05 11:07:38,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-08-05 11:07:38,981 INFO L225 Difference]: With dead ends: 24 [2019-08-05 11:07:38,981 INFO L226 Difference]: Without dead ends: 0 [2019-08-05 11:07:38,982 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-08-05 11:07:38,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-08-05 11:07:38,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-08-05 11:07:38,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-08-05 11:07:38,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-08-05 11:07:38,983 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 23 [2019-08-05 11:07:38,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-08-05 11:07:38,983 INFO L475 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-08-05 11:07:38,983 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-08-05 11:07:38,983 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-08-05 11:07:38,984 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-08-05 11:07:38,989 INFO L202 PluginConnector]: Adding new model Ackermann_Main.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 05.08 11:07:38 BoogieIcfgContainer [2019-08-05 11:07:38,989 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-08-05 11:07:38,992 INFO L168 Benchmark]: Toolchain (without parser) took 1976.63 ms. Allocated memory was 141.0 MB in the beginning and 176.7 MB in the end (delta: 35.7 MB). Free memory was 109.4 MB in the beginning and 127.6 MB in the end (delta: -18.2 MB). Peak memory consumption was 17.4 MB. Max. memory is 7.1 GB. [2019-08-05 11:07:38,993 INFO L168 Benchmark]: Boogie PL CUP Parser took 1.33 ms. Allocated memory is still 141.0 MB. Free memory is still 110.3 MB. There was no memory consumed. Max. memory is 7.1 GB. [2019-08-05 11:07:38,994 INFO L168 Benchmark]: Boogie Procedure Inliner took 35.78 ms. Allocated memory is still 141.0 MB. Free memory was 109.4 MB in the beginning and 107.3 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 7.1 GB. [2019-08-05 11:07:38,995 INFO L168 Benchmark]: Boogie Preprocessor took 21.12 ms. Allocated memory is still 141.0 MB. Free memory was 107.3 MB in the beginning and 106.4 MB in the end (delta: 857.4 kB). Peak memory consumption was 857.4 kB. Max. memory is 7.1 GB. [2019-08-05 11:07:38,996 INFO L168 Benchmark]: RCFGBuilder took 274.45 ms. Allocated memory is still 141.0 MB. Free memory was 106.0 MB in the beginning and 96.2 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2019-08-05 11:07:38,997 INFO L168 Benchmark]: TraceAbstraction took 1640.62 ms. Allocated memory was 141.0 MB in the beginning and 176.7 MB in the end (delta: 35.7 MB). Free memory was 95.8 MB in the beginning and 127.6 MB in the end (delta: -31.8 MB). Peak memory consumption was 3.8 MB. Max. memory is 7.1 GB. [2019-08-05 11:07:39,001 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 1.33 ms. Allocated memory is still 141.0 MB. Free memory is still 110.3 MB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 35.78 ms. Allocated memory is still 141.0 MB. Free memory was 109.4 MB in the beginning and 107.3 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 21.12 ms. Allocated memory is still 141.0 MB. Free memory was 107.3 MB in the beginning and 106.4 MB in the end (delta: 857.4 kB). Peak memory consumption was 857.4 kB. Max. memory is 7.1 GB. * RCFGBuilder took 274.45 ms. Allocated memory is still 141.0 MB. Free memory was 106.0 MB in the beginning and 96.2 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1640.62 ms. Allocated memory was 141.0 MB in the beginning and 176.7 MB in the end (delta: 35.7 MB). Free memory was 95.8 MB in the beginning and 127.6 MB in the end (delta: -31.8 MB). Peak memory consumption was 3.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 12]: procedure postcondition always holds For all program executions holds that procedure postcondition always holds at this location - PositiveResult [Line: 34]: procedure postcondition always holds For all program executions holds that procedure postcondition always holds at this location - AllSpecificationsHoldResult: All specifications hold 2 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 13 locations, 2 error locations. SAFE Result, 1.5s OverallTime, 4 OverallIterations, 4 TraceHistogramMax, 0.8s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 44 SDtfs, 15 SDslu, 49 SDs, 0 SdLazy, 102 SolverSat, 10 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 43 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=23occurred in iteration=3, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 4 MinimizatonAttempts, 1 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 44 NumberOfCodeBlocks, 44 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 40 ConstructedInterpolants, 0 QuantifiedInterpolants, 1024 SizeOfPredicates, 2 NumberOfNonLiveVariables, 125 ConjunctsInSsa, 14 ConjunctsInUnsatCore, 4 InterpolantComputations, 4 PerfectInterpolantSequences, 29/29 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...