java -Xss4m -Xmx4000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCHC.xml --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -s ../../../trunk/examples/settings/chc/AutomizerCHC/AutomizerCHC_Goto.epf -i /storage/chc-comp/vmt-chc-benchmarks/ctigar/nest-len.c.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-14921ce [2018-06-25 13:21:52,037 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-25 13:21:52,040 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-25 13:21:52,055 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-25 13:21:52,055 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-25 13:21:52,057 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-25 13:21:52,058 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-25 13:21:52,060 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-25 13:21:52,063 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-25 13:21:52,064 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-25 13:21:52,064 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-25 13:21:52,065 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-25 13:21:52,065 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-25 13:21:52,074 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-06-25 13:21:52,075 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-25 13:21:52,075 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-25 13:21:52,077 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-25 13:21:52,080 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-25 13:21:52,086 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-25 13:21:52,087 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-25 13:21:52,088 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-25 13:21:52,089 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-25 13:21:52,090 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-25 13:21:52,091 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-25 13:21:52,093 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-25 13:21:52,093 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-25 13:21:52,094 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-25 13:21:52,096 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-25 13:21:52,097 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-25 13:21:52,097 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-25 13:21:52,098 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-25 13:21:52,099 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-25 13:21:52,099 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-25 13:21:52,100 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-25 13:21:52,105 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-25 13:21:52,105 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/chc/AutomizerCHC/AutomizerCHC_Goto.epf [2018-06-25 13:21:52,128 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-25 13:21:52,128 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-25 13:21:52,129 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-25 13:21:52,129 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-25 13:21:52,130 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-06-25 13:21:52,130 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-06-25 13:21:52,130 INFO L133 SettingsManager]: * Create interprocedural compositions=false [2018-06-25 13:21:52,131 INFO L133 SettingsManager]: * Use SBE=true [2018-06-25 13:21:52,131 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-25 13:21:52,131 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-25 13:21:52,131 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-25 13:21:52,131 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-25 13:21:52,131 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-25 13:21:52,132 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-25 13:21:52,132 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-25 13:21:52,132 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-25 13:21:52,132 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-25 13:21:52,132 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-25 13:21:52,132 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-25 13:21:52,133 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-25 13:21:52,133 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-25 13:21:52,134 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-25 13:21:52,134 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-25 13:21:52,182 INFO ]: Repository-Root is: /tmp [2018-06-25 13:21:52,200 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-25 13:21:52,206 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-25 13:21:52,207 INFO ]: Initializing SmtParser... [2018-06-25 13:21:52,208 INFO ]: SmtParser initialized [2018-06-25 13:21:52,208 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/ctigar/nest-len.c.smt2 [2018-06-25 13:21:52,209 INFO ]: Parsing .smt2 file as a set of Horn Clauses No working directory specified, using /storage/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 [2018-06-25 13:21:52,298 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/nest-len.c.smt2 unknown [2018-06-25 13:21:52,638 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/nest-len.c.smt2 [2018-06-25 13:21:52,642 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-25 13:21:52,649 INFO ]: Walking toolchain with 4 elements. [2018-06-25 13:21:52,649 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-25 13:21:52,649 INFO ]: Initializing ChcToBoogie... [2018-06-25 13:21:52,649 INFO ]: ChcToBoogie initialized [2018-06-25 13:21:52,652 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 25.06 01:21:52" (1/1) ... [2018-06-25 13:21:52,720 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:21:52 Unit [2018-06-25 13:21:52,721 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-25 13:21:52,723 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-25 13:21:52,723 INFO ]: Initializing Boogie Preprocessor... [2018-06-25 13:21:52,723 INFO ]: Boogie Preprocessor initialized [2018-06-25 13:21:52,743 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:21:52" (1/1) ... [2018-06-25 13:21:52,744 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:21:52" (1/1) ... [2018-06-25 13:21:52,752 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:21:52" (1/1) ... [2018-06-25 13:21:52,752 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:21:52" (1/1) ... [2018-06-25 13:21:52,772 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:21:52" (1/1) ... [2018-06-25 13:21:52,773 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:21:52" (1/1) ... [2018-06-25 13:21:52,775 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:21:52" (1/1) ... [2018-06-25 13:21:52,778 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-25 13:21:52,778 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-25 13:21:52,778 INFO ]: Initializing RCFGBuilder... [2018-06-25 13:21:52,778 INFO ]: RCFGBuilder initialized [2018-06-25 13:21:52,779 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:21:52" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2018-06-25 13:21:52,812 INFO ]: Specification and implementation of procedure gotoProc given in one single declaration [2018-06-25 13:21:52,812 INFO ]: Found specification of procedure gotoProc [2018-06-25 13:21:52,812 INFO ]: Found implementation of procedure gotoProc [2018-06-25 13:21:52,812 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-25 13:21:52,812 INFO ]: Found specification of procedure Ultimate.START [2018-06-25 13:21:52,812 INFO ]: Found implementation of procedure Ultimate.START Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-25 13:21:53,086 INFO ]: Using library mode [2018-06-25 13:21:53,086 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.06 01:21:53 BoogieIcfgContainer [2018-06-25 13:21:53,086 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-25 13:21:53,087 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-25 13:21:53,087 INFO ]: Initializing TraceAbstraction... [2018-06-25 13:21:53,090 INFO ]: TraceAbstraction initialized [2018-06-25 13:21:53,090 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 25.06 01:21:52" (1/3) ... [2018-06-25 13:21:53,091 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@580614b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 25.06 01:21:53, skipping insertion in model container [2018-06-25 13:21:53,091 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:21:52" (2/3) ... [2018-06-25 13:21:53,092 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@580614b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.06 01:21:53, skipping insertion in model container [2018-06-25 13:21:53,092 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.06 01:21:53" (3/3) ... [2018-06-25 13:21:53,093 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver [2018-06-25 13:21:53,101 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-25 13:21:53,107 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-25 13:21:53,148 INFO ]: Using default assertion order modulation [2018-06-25 13:21:53,149 INFO ]: Interprodecural is true [2018-06-25 13:21:53,149 INFO ]: Hoare is false [2018-06-25 13:21:53,149 INFO ]: Compute interpolants for FPandBP [2018-06-25 13:21:53,149 INFO ]: Backedges is TWOTRACK [2018-06-25 13:21:53,149 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-25 13:21:53,149 INFO ]: Difference is false [2018-06-25 13:21:53,149 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-25 13:21:53,149 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-25 13:21:53,162 INFO ]: Start isEmpty. Operand 10 states. [2018-06-25 13:21:53,176 INFO ]: Finished isEmpty. Found accepting run of length 8 [2018-06-25 13:21:53,176 INFO ]: Found error trace [2018-06-25 13:21:53,177 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-06-25 13:21:53,179 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 13:21:53,184 INFO ]: Analyzing trace with hash 1285054476, now seen corresponding path program 1 times [2018-06-25 13:21:53,186 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 13:21:53,187 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 13:21:53,228 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:21:53,228 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 13:21:53,228 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:21:53,277 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:21:53,385 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:21:53,388 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-25 13:21:53,388 INFO ]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-06-25 13:21:53,390 INFO ]: Interpolant automaton has 3 states [2018-06-25 13:21:53,406 INFO ]: Constructing interpolant automaton starting with 3 interpolants. [2018-06-25 13:21:53,406 INFO ]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-06-25 13:21:53,409 INFO ]: Start difference. First operand 10 states. Second operand 3 states. [2018-06-25 13:21:53,498 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 13:21:53,498 INFO ]: Finished difference Result 9 states and 9 transitions. [2018-06-25 13:21:53,501 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-06-25 13:21:53,503 INFO ]: Start accepts. Automaton has 3 states. Word has length 7 [2018-06-25 13:21:53,503 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 13:21:53,516 INFO ]: With dead ends: 9 [2018-06-25 13:21:53,516 INFO ]: Without dead ends: 9 [2018-06-25 13:21:53,518 INFO ]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-06-25 13:21:53,542 INFO ]: Start minimizeSevpa. Operand 9 states. [2018-06-25 13:21:53,558 INFO ]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-06-25 13:21:53,559 INFO ]: Start removeUnreachable. Operand 9 states. [2018-06-25 13:21:53,559 INFO ]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-06-25 13:21:53,561 INFO ]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2018-06-25 13:21:53,561 INFO ]: Finished accepts. word is rejected. [2018-06-25 13:21:53,561 INFO ]: Abstraction has 9 states and 9 transitions. [2018-06-25 13:21:53,561 INFO ]: Interpolant automaton has 3 states. [2018-06-25 13:21:53,561 INFO ]: Start isEmpty. Operand 9 states and 9 transitions. [2018-06-25 13:21:53,561 INFO ]: Finished isEmpty. Found accepting run of length 9 [2018-06-25 13:21:53,561 INFO ]: Found error trace [2018-06-25 13:21:53,561 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2018-06-25 13:21:53,561 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 13:21:53,561 INFO ]: Analyzing trace with hash 1180100628, now seen corresponding path program 1 times [2018-06-25 13:21:53,561 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 13:21:53,561 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 13:21:53,562 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:21:53,562 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 13:21:53,562 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:21:53,606 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:21:53,781 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:21:53,781 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 13:21:53,782 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/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 [2018-06-25 13:21:53,789 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 13:21:53,853 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:21:53,862 INFO ]: Computing forward predicates... [2018-06-25 13:21:54,203 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:21:54,223 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 13:21:54,223 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2018-06-25 13:21:54,224 INFO ]: Interpolant automaton has 5 states [2018-06-25 13:21:54,224 INFO ]: Constructing interpolant automaton starting with 5 interpolants. [2018-06-25 13:21:54,224 INFO ]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-06-25 13:21:54,224 INFO ]: Start difference. First operand 9 states and 9 transitions. Second operand 5 states. [2018-06-25 13:21:54,351 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 13:21:54,351 INFO ]: Finished difference Result 10 states and 10 transitions. [2018-06-25 13:21:54,352 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-06-25 13:21:54,352 INFO ]: Start accepts. Automaton has 5 states. Word has length 8 [2018-06-25 13:21:54,352 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 13:21:54,353 INFO ]: With dead ends: 10 [2018-06-25 13:21:54,353 INFO ]: Without dead ends: 10 [2018-06-25 13:21:54,353 INFO ]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-06-25 13:21:54,354 INFO ]: Start minimizeSevpa. Operand 10 states. [2018-06-25 13:21:54,354 INFO ]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-06-25 13:21:54,355 INFO ]: Start removeUnreachable. Operand 10 states. [2018-06-25 13:21:54,355 INFO ]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-06-25 13:21:54,355 INFO ]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 8 [2018-06-25 13:21:54,355 INFO ]: Finished accepts. word is rejected. [2018-06-25 13:21:54,355 INFO ]: Abstraction has 10 states and 10 transitions. [2018-06-25 13:21:54,355 INFO ]: Interpolant automaton has 5 states. [2018-06-25 13:21:54,355 INFO ]: Start isEmpty. Operand 10 states and 10 transitions. [2018-06-25 13:21:54,355 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-25 13:21:54,355 INFO ]: Found error trace [2018-06-25 13:21:54,355 INFO ]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2018-06-25 13:21:54,355 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 13:21:54,356 INFO ]: Analyzing trace with hash -2073468660, now seen corresponding path program 2 times [2018-06-25 13:21:54,356 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 13:21:54,356 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 13:21:54,357 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:21:54,357 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 13:21:54,357 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:21:54,420 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:21:54,625 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:21:54,625 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 13:21:54,625 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/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 [2018-06-25 13:21:54,633 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-25 13:21:54,719 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-25 13:21:54,719 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:21:54,723 INFO ]: Computing forward predicates... [2018-06-25 13:21:55,705 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:21:55,729 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 13:21:55,729 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2018-06-25 13:21:55,729 INFO ]: Interpolant automaton has 6 states [2018-06-25 13:21:55,729 INFO ]: Constructing interpolant automaton starting with 6 interpolants. [2018-06-25 13:21:55,729 INFO ]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-06-25 13:21:55,730 INFO ]: Start difference. First operand 10 states and 10 transitions. Second operand 6 states. [2018-06-25 13:21:55,883 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 13:21:55,883 INFO ]: Finished difference Result 11 states and 11 transitions. [2018-06-25 13:21:55,884 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-25 13:21:55,884 INFO ]: Start accepts. Automaton has 6 states. Word has length 9 [2018-06-25 13:21:55,884 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 13:21:55,884 INFO ]: With dead ends: 11 [2018-06-25 13:21:55,884 INFO ]: Without dead ends: 11 [2018-06-25 13:21:55,884 INFO ]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=26, Invalid=30, Unknown=0, NotChecked=0, Total=56 [2018-06-25 13:21:55,884 INFO ]: Start minimizeSevpa. Operand 11 states. [2018-06-25 13:21:55,885 INFO ]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-06-25 13:21:55,885 INFO ]: Start removeUnreachable. Operand 11 states. [2018-06-25 13:21:55,886 INFO ]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-06-25 13:21:55,886 INFO ]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2018-06-25 13:21:55,886 INFO ]: Finished accepts. word is rejected. [2018-06-25 13:21:55,886 INFO ]: Abstraction has 11 states and 11 transitions. [2018-06-25 13:21:55,886 INFO ]: Interpolant automaton has 6 states. [2018-06-25 13:21:55,886 INFO ]: Start isEmpty. Operand 11 states and 11 transitions. [2018-06-25 13:21:55,886 INFO ]: Finished isEmpty. Found accepting run of length 11 [2018-06-25 13:21:55,886 INFO ]: Found error trace [2018-06-25 13:21:55,886 INFO ]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1] [2018-06-25 13:21:55,887 INFO ]: === Iteration 4 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 13:21:55,887 INFO ]: Analyzing trace with hash 145098516, now seen corresponding path program 3 times [2018-06-25 13:21:55,887 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 13:21:55,887 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 13:21:55,888 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:21:55,888 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-25 13:21:55,888 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:21:55,936 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:21:56,358 WARN ]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-06-25 13:21:56,483 INFO ]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:21:56,483 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 13:21:56,483 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/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 [2018-06-25 13:21:56,496 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-25 13:21:56,560 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-06-25 13:21:56,560 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:21:56,564 INFO ]: Computing forward predicates... [2018-06-25 13:22:03,299 WARN ]: expecting exponential blowup for input size 6 Received shutdown request... [2018-06-25 13:23:09,018 INFO ]: Timeout while computing interpolants [2018-06-25 13:23:09,218 WARN ]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-25 13:23:09,219 WARN ]: Verification canceled [2018-06-25 13:23:09,223 WARN ]: Timeout [2018-06-25 13:23:09,224 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.06 01:23:09 BoogieIcfgContainer [2018-06-25 13:23:09,224 INFO ]: ------------------------ END TraceAbstraction---------------------------- [2018-06-25 13:23:09,224 INFO ]: Toolchain (without parser) took 76581.64 ms. Allocated memory was 303.6 MB in the beginning and 1.5 GB in the end (delta: 1.2 GB). Free memory was 252.0 MB in the beginning and 1.4 GB in the end (delta: -1.2 GB). Peak memory consumption was 1.3 GB. Max. memory is 3.6 GB. [2018-06-25 13:23:09,225 INFO ]: SmtParser took 0.07 ms. Allocated memory is still 303.6 MB. Free memory is still 269.0 MB. There was no memory consumed. Max. memory is 3.6 GB. [2018-06-25 13:23:09,226 INFO ]: ChcToBoogie took 73.23 ms. Allocated memory is still 303.6 MB. Free memory was 252.0 MB in the beginning and 250.0 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 3.6 GB. [2018-06-25 13:23:09,226 INFO ]: Boogie Preprocessor took 55.28 ms. Allocated memory is still 303.6 MB. Free memory was 250.0 MB in the beginning and 248.0 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 3.6 GB. [2018-06-25 13:23:09,227 INFO ]: RCFGBuilder took 307.72 ms. Allocated memory is still 303.6 MB. Free memory was 248.0 MB in the beginning and 235.7 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 3.6 GB. [2018-06-25 13:23:09,227 INFO ]: TraceAbstraction took 76136.28 ms. Allocated memory was 303.6 MB in the beginning and 1.5 GB in the end (delta: 1.2 GB). Free memory was 234.7 MB in the beginning and 1.4 GB in the end (delta: -1.2 GB). Peak memory consumption was 1.3 GB. Max. memory is 3.6 GB. [2018-06-25 13:23:09,231 INFO ]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * SmtParser took 0.07 ms. Allocated memory is still 303.6 MB. Free memory is still 269.0 MB. There was no memory consumed. Max. memory is 3.6 GB. * ChcToBoogie took 73.23 ms. Allocated memory is still 303.6 MB. Free memory was 252.0 MB in the beginning and 250.0 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 3.6 GB. * Boogie Preprocessor took 55.28 ms. Allocated memory is still 303.6 MB. Free memory was 250.0 MB in the beginning and 248.0 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 3.6 GB. * RCFGBuilder took 307.72 ms. Allocated memory is still 303.6 MB. Free memory was 248.0 MB in the beginning and 235.7 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 3.6 GB. * TraceAbstraction took 76136.28 ms. Allocated memory was 303.6 MB in the beginning and 1.5 GB in the end (delta: 1.2 GB). Free memory was 234.7 MB in the beginning and 1.4 GB in the end (delta: -1.2 GB). Peak memory consumption was 1.3 GB. Max. memory is 3.6 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [UNKNOWN] : Timeout (TraceAbstraction) Unable to prove that assertion always holds (line 0). Cancelled while BasicCegarLoop was analyzing trace of length 11 with TraceHistMax 3, while TraceCheckSpWp was constructing forward predicates, while PartialQuantifierElimination was eliminating quantifiers from formula with 0 quantifier alternations, while DnfTransformerHelper was transforming 0 conjuction. - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 10 locations, 1 error locations. TIMEOUT Result, 76.0s OverallTime, 4 OverallIterations, 3 TraceHistogramMax, 0.4s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 21 SDtfs, 2 SDslu, 38 SDs, 0 SdLazy, 17 SolverSat, 5 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 30 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=11occurred 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, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.8s InterpolantComputationTime, 41 NumberOfCodeBlocks, 41 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 36 ConstructedInterpolants, 0 QuantifiedInterpolants, 647 SizeOfPredicates, 12 NumberOfNonLiveVariables, 285 ConjunctsInSsa, 40 ConjunctsInUnsatCore, 5 InterpolantComputations, 1 PerfectInterpolantSequences, 0/8 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/nest-len.c.smt2_AutomizerCHC_Goto.epf_AutomizerCHC.xml/Csv-Benchmark-0-2018-06-25_13-23-09-242.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/nest-len.c.smt2_AutomizerCHC_Goto.epf_AutomizerCHC.xml/Csv-TraceAbstractionBenchmarks-0-2018-06-25_13-23-09-242.csv Completed graceful shutdown