java -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/chccomp2018/chcToBoogie_automizer.epf -i /storage/chc-comp/vmt-chc-benchmarks/ctigar/nest-if2.c.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-55b8104 [2018-06-18 13:31:24,498 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-18 13:31:24,500 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-18 13:31:24,513 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-18 13:31:24,514 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-18 13:31:24,514 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-18 13:31:24,518 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-18 13:31:24,520 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-18 13:31:24,522 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-18 13:31:24,523 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-18 13:31:24,524 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-18 13:31:24,524 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-18 13:31:24,525 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-18 13:31:24,527 INFO L177 SettingsManager]: ChcToBoogie provides no preferences, ignoring... [2018-06-18 13:31:24,528 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-18 13:31:24,529 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-18 13:31:24,530 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-18 13:31:24,532 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-18 13:31:24,534 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-18 13:31:24,535 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-18 13:31:24,536 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-18 13:31:24,539 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-18 13:31:24,539 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-18 13:31:24,539 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-18 13:31:24,540 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-18 13:31:24,541 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-18 13:31:24,542 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-18 13:31:24,542 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-18 13:31:24,543 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-18 13:31:24,544 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-18 13:31:24,544 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-18 13:31:24,545 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-18 13:31:24,545 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-18 13:31:24,546 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-18 13:31:24,547 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-18 13:31:24,547 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/chccomp2018/chcToBoogie_automizer.epf [2018-06-18 13:31:24,560 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-18 13:31:24,560 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-18 13:31:24,560 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-18 13:31:24,561 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-18 13:31:24,562 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-18 13:31:24,562 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-18 13:31:24,562 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-18 13:31:24,562 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-18 13:31:24,563 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-18 13:31:24,563 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-18 13:31:24,563 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-18 13:31:24,563 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-18 13:31:24,563 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-18 13:31:24,563 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-18 13:31:24,564 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-18 13:31:24,564 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-18 13:31:24,564 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-18 13:31:24,565 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-18 13:31:24,566 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-18 13:31:24,627 INFO ]: Repository-Root is: /tmp [2018-06-18 13:31:24,643 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-18 13:31:24,648 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-18 13:31:24,650 INFO ]: Initializing SmtParser... [2018-06-18 13:31:24,650 INFO ]: SmtParser initialized [2018-06-18 13:31:24,651 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/ctigar/nest-if2.c.smt2 [2018-06-18 13:31:24,652 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 [2018-06-18 13:31:24,743 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/nest-if2.c.smt2 unknown [2018-06-18 13:31:25,052 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/nest-if2.c.smt2 [2018-06-18 13:31:25,056 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-18 13:31:25,063 INFO ]: Walking toolchain with 4 elements. [2018-06-18 13:31:25,064 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-18 13:31:25,064 INFO ]: Initializing ChcToBoogie... [2018-06-18 13:31:25,064 INFO ]: ChcToBoogie initialized [2018-06-18 13:31:25,071 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 18.06 01:31:25" (1/1) ... [2018-06-18 13:31:25,150 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:31:25 Unit [2018-06-18 13:31:25,150 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-18 13:31:25,151 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-18 13:31:25,151 INFO ]: Initializing Boogie Preprocessor... [2018-06-18 13:31:25,151 INFO ]: Boogie Preprocessor initialized [2018-06-18 13:31:25,174 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:31:25" (1/1) ... [2018-06-18 13:31:25,174 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:31:25" (1/1) ... [2018-06-18 13:31:25,186 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:31:25" (1/1) ... [2018-06-18 13:31:25,187 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:31:25" (1/1) ... [2018-06-18 13:31:25,191 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:31:25" (1/1) ... [2018-06-18 13:31:25,193 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:31:25" (1/1) ... [2018-06-18 13:31:25,194 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:31:25" (1/1) ... [2018-06-18 13:31:25,196 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-18 13:31:25,197 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-18 13:31:25,197 INFO ]: Initializing RCFGBuilder... [2018-06-18 13:31:25,197 INFO ]: RCFGBuilder initialized [2018-06-18 13:31:25,198 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:31:25" (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) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-18 13:31:25,223 INFO ]: Specification and implementation of procedure False given in one single declaration [2018-06-18 13:31:25,223 INFO ]: Found specification of procedure False [2018-06-18 13:31:25,223 INFO ]: Found implementation of procedure False [2018-06-18 13:31:25,224 INFO ]: Specification and implementation of procedure state given in one single declaration [2018-06-18 13:31:25,224 INFO ]: Found specification of procedure state [2018-06-18 13:31:25,224 INFO ]: Found implementation of procedure state [2018-06-18 13:31:25,224 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-18 13:31:25,224 INFO ]: Found specification of procedure Ultimate.START [2018-06-18 13:31:25,224 INFO ]: Found implementation of procedure Ultimate.START [2018-06-18 13:31:25,407 INFO ]: Using library mode [2018-06-18 13:31:25,408 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.06 01:31:25 BoogieIcfgContainer [2018-06-18 13:31:25,408 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-18 13:31:25,409 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-18 13:31:25,409 INFO ]: Initializing TraceAbstraction... [2018-06-18 13:31:25,412 INFO ]: TraceAbstraction initialized [2018-06-18 13:31:25,412 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 18.06 01:31:25" (1/3) ... [2018-06-18 13:31:25,413 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@304db232 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 18.06 01:31:25, skipping insertion in model container [2018-06-18 13:31:25,413 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:31:25" (2/3) ... [2018-06-18 13:31:25,414 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@304db232 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.06 01:31:25, skipping insertion in model container [2018-06-18 13:31:25,414 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.06 01:31:25" (3/3) ... [2018-06-18 13:31:25,416 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver [2018-06-18 13:31:25,425 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-18 13:31:25,433 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-18 13:31:25,471 INFO ]: Using default assertion order modulation [2018-06-18 13:31:25,471 INFO ]: Interprodecural is true [2018-06-18 13:31:25,471 INFO ]: Hoare is false [2018-06-18 13:31:25,471 INFO ]: Compute interpolants for FPandBP [2018-06-18 13:31:25,471 INFO ]: Backedges is TWOTRACK [2018-06-18 13:31:25,471 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-18 13:31:25,471 INFO ]: Difference is false [2018-06-18 13:31:25,471 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-18 13:31:25,471 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-18 13:31:25,484 INFO ]: Start isEmpty. Operand 13 states. [2018-06-18 13:31:25,497 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-18 13:31:25,497 INFO ]: Found error trace [2018-06-18 13:31:25,498 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:31:25,498 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:31:25,507 INFO ]: Analyzing trace with hash -683425083, now seen corresponding path program 1 times [2018-06-18 13:31:25,509 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:31:25,509 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:31:25,543 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:31:25,543 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:31:25,543 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:31:25,568 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:31:25,575 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:31:25,661 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-18 13:31:25,665 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-18 13:31:25,665 INFO ]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-06-18 13:31:25,667 INFO ]: Interpolant automaton has 4 states [2018-06-18 13:31:25,695 INFO ]: Constructing interpolant automaton starting with 4 interpolants. [2018-06-18 13:31:25,696 INFO ]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-18 13:31:25,707 INFO ]: Start difference. First operand 13 states. Second operand 4 states. [2018-06-18 13:31:25,809 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:31:25,809 INFO ]: Finished difference Result 13 states and 14 transitions. [2018-06-18 13:31:25,810 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-06-18 13:31:25,811 INFO ]: Start accepts. Automaton has 4 states. Word has length 9 [2018-06-18 13:31:25,811 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:31:25,822 INFO ]: With dead ends: 13 [2018-06-18 13:31:25,822 INFO ]: Without dead ends: 13 [2018-06-18 13:31:25,827 INFO ]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-18 13:31:25,844 INFO ]: Start minimizeSevpa. Operand 13 states. [2018-06-18 13:31:25,868 INFO ]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-06-18 13:31:25,869 INFO ]: Start removeUnreachable. Operand 13 states. [2018-06-18 13:31:25,870 INFO ]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-06-18 13:31:25,871 INFO ]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 9 [2018-06-18 13:31:25,871 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:31:25,871 INFO ]: Abstraction has 13 states and 14 transitions. [2018-06-18 13:31:25,871 INFO ]: Interpolant automaton has 4 states. [2018-06-18 13:31:25,871 INFO ]: Start isEmpty. Operand 13 states and 14 transitions. [2018-06-18 13:31:25,872 INFO ]: Finished isEmpty. Found accepting run of length 14 [2018-06-18 13:31:25,872 INFO ]: Found error trace [2018-06-18 13:31:25,872 INFO ]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:31:25,872 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:31:25,873 INFO ]: Analyzing trace with hash 204343015, now seen corresponding path program 1 times [2018-06-18 13:31:25,873 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:31:25,873 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:31:25,874 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:31:25,874 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:31:25,874 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:31:25,917 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:31:25,918 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:31:26,182 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-18 13:31:26,182 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:31:26,182 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 [2018-06-18 13:31:26,190 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:31:26,218 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:31:26,228 INFO ]: Computing forward predicates... [2018-06-18 13:31:26,608 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-18 13:31:26,644 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:31:26,644 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-06-18 13:31:26,645 INFO ]: Interpolant automaton has 6 states [2018-06-18 13:31:26,645 INFO ]: Constructing interpolant automaton starting with 6 interpolants. [2018-06-18 13:31:26,645 INFO ]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2018-06-18 13:31:26,645 INFO ]: Start difference. First operand 13 states and 14 transitions. Second operand 6 states. [2018-06-18 13:31:26,790 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:31:26,790 INFO ]: Finished difference Result 15 states and 16 transitions. [2018-06-18 13:31:26,792 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-18 13:31:26,792 INFO ]: Start accepts. Automaton has 6 states. Word has length 13 [2018-06-18 13:31:26,792 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:31:26,793 INFO ]: With dead ends: 15 [2018-06-18 13:31:26,793 INFO ]: Without dead ends: 15 [2018-06-18 13:31:26,793 INFO ]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2018-06-18 13:31:26,794 INFO ]: Start minimizeSevpa. Operand 15 states. [2018-06-18 13:31:26,799 INFO ]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-06-18 13:31:26,799 INFO ]: Start removeUnreachable. Operand 15 states. [2018-06-18 13:31:26,799 INFO ]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-06-18 13:31:26,799 INFO ]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2018-06-18 13:31:26,799 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:31:26,800 INFO ]: Abstraction has 15 states and 16 transitions. [2018-06-18 13:31:26,800 INFO ]: Interpolant automaton has 6 states. [2018-06-18 13:31:26,800 INFO ]: Start isEmpty. Operand 15 states and 16 transitions. [2018-06-18 13:31:26,800 INFO ]: Finished isEmpty. Found accepting run of length 18 [2018-06-18 13:31:26,800 INFO ]: Found error trace [2018-06-18 13:31:26,800 INFO ]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:31:26,800 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:31:26,800 INFO ]: Analyzing trace with hash -1649658231, now seen corresponding path program 2 times [2018-06-18 13:31:26,800 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:31:26,801 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:31:26,801 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:31:26,801 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:31:26,801 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:31:26,895 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:31:26,895 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:31:27,230 WARN ]: Spent 213.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 9 [2018-06-18 13:31:27,674 WARN ]: Spent 367.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2018-06-18 13:31:27,799 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-18 13:31:27,799 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:31:27,799 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 [2018-06-18 13:31:27,807 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-18 13:31:27,860 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-18 13:31:27,860 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:31:27,863 INFO ]: Computing forward predicates... [2018-06-18 13:31:28,203 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-18 13:31:28,235 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:31:28,235 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-06-18 13:31:28,235 INFO ]: Interpolant automaton has 8 states [2018-06-18 13:31:28,235 INFO ]: Constructing interpolant automaton starting with 8 interpolants. [2018-06-18 13:31:28,235 INFO ]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2018-06-18 13:31:28,236 INFO ]: Start difference. First operand 15 states and 16 transitions. Second operand 8 states. [2018-06-18 13:31:28,661 WARN ]: Spent 103.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 16 [2018-06-18 13:31:28,680 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:31:28,680 INFO ]: Finished difference Result 17 states and 18 transitions. [2018-06-18 13:31:28,681 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-06-18 13:31:28,681 INFO ]: Start accepts. Automaton has 8 states. Word has length 17 [2018-06-18 13:31:28,681 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:31:28,681 INFO ]: With dead ends: 17 [2018-06-18 13:31:28,681 INFO ]: Without dead ends: 17 [2018-06-18 13:31:28,682 INFO ]: 0 DeclaredPredicates, 26 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2018-06-18 13:31:28,682 INFO ]: Start minimizeSevpa. Operand 17 states. [2018-06-18 13:31:28,685 INFO ]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-06-18 13:31:28,685 INFO ]: Start removeUnreachable. Operand 17 states. [2018-06-18 13:31:28,686 INFO ]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-06-18 13:31:28,686 INFO ]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 17 [2018-06-18 13:31:28,686 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:31:28,686 INFO ]: Abstraction has 17 states and 18 transitions. [2018-06-18 13:31:28,686 INFO ]: Interpolant automaton has 8 states. [2018-06-18 13:31:28,686 INFO ]: Start isEmpty. Operand 17 states and 18 transitions. [2018-06-18 13:31:28,687 INFO ]: Finished isEmpty. Found accepting run of length 22 [2018-06-18 13:31:28,687 INFO ]: Found error trace [2018-06-18 13:31:28,687 INFO ]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:31:28,687 INFO ]: === Iteration 4 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:31:28,687 INFO ]: Analyzing trace with hash 2119922091, now seen corresponding path program 3 times [2018-06-18 13:31:28,687 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:31:28,687 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:31:28,688 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:31:28,688 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:31:28,688 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:31:28,730 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:31:28,731 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:31:29,186 INFO ]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-18 13:31:29,186 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:31:29,228 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 [2018-06-18 13:31:29,235 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-18 13:31:29,307 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-06-18 13:31:29,307 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:31:29,311 INFO ]: Computing forward predicates... [2018-06-18 13:31:31,853 WARN ]: Spent 1.96 s on a formula simplification. DAG size of input: 256 DAG size of output: 20 [2018-06-18 13:31:32,087 INFO ]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-18 13:31:32,110 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:31:32,110 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 13 [2018-06-18 13:31:32,110 INFO ]: Interpolant automaton has 13 states [2018-06-18 13:31:32,110 INFO ]: Constructing interpolant automaton starting with 13 interpolants. [2018-06-18 13:31:32,110 INFO ]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2018-06-18 13:31:32,111 INFO ]: Start difference. First operand 17 states and 18 transitions. Second operand 13 states. [2018-06-18 13:31:32,260 WARN ]: Spent 112.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 34 [2018-06-18 13:31:32,601 WARN ]: Spent 154.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 34 [2018-06-18 13:31:32,619 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:31:32,619 INFO ]: Finished difference Result 19 states and 20 transitions. [2018-06-18 13:31:32,619 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-06-18 13:31:32,619 INFO ]: Start accepts. Automaton has 13 states. Word has length 21 [2018-06-18 13:31:32,619 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:31:32,620 INFO ]: With dead ends: 19 [2018-06-18 13:31:32,620 INFO ]: Without dead ends: 19 [2018-06-18 13:31:32,620 INFO ]: 0 DeclaredPredicates, 35 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2018-06-18 13:31:32,620 INFO ]: Start minimizeSevpa. Operand 19 states. [2018-06-18 13:31:32,623 INFO ]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-06-18 13:31:32,623 INFO ]: Start removeUnreachable. Operand 19 states. [2018-06-18 13:31:32,624 INFO ]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-06-18 13:31:32,624 INFO ]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 21 [2018-06-18 13:31:32,624 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:31:32,624 INFO ]: Abstraction has 19 states and 20 transitions. [2018-06-18 13:31:32,624 INFO ]: Interpolant automaton has 13 states. [2018-06-18 13:31:32,624 INFO ]: Start isEmpty. Operand 19 states and 20 transitions. [2018-06-18 13:31:32,625 INFO ]: Finished isEmpty. Found accepting run of length 26 [2018-06-18 13:31:32,625 INFO ]: Found error trace [2018-06-18 13:31:32,625 INFO ]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:31:32,625 INFO ]: === Iteration 5 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:31:32,625 INFO ]: Analyzing trace with hash 1762711629, now seen corresponding path program 4 times [2018-06-18 13:31:32,625 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:31:32,625 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:31:32,626 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:31:32,626 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:31:32,626 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:31:32,668 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:31:32,669 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:31:33,042 INFO ]: Checked inductivity of 36 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-06-18 13:31:33,042 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:31:33,042 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/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 [2018-06-18 13:31:33,052 INFO ]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-06-18 13:31:33,084 INFO ]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-06-18 13:31:33,084 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:31:33,088 INFO ]: Computing forward predicates... [2018-06-18 13:31:37,533 WARN ]: Spent 3.97 s on a formula simplification. DAG size of input: 320 DAG size of output: 41 [2018-06-18 13:31:42,528 WARN ]: Spent 4.54 s on a formula simplification. DAG size of input: 156 DAG size of output: 44 [2018-06-18 13:31:44,337 WARN ]: Spent 188.00 ms on a formula simplification. DAG size of input: 7 DAG size of output: 2 [2018-06-18 13:31:44,366 INFO ]: Checked inductivity of 36 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-06-18 13:31:44,399 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:31:44,399 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2018-06-18 13:31:44,399 INFO ]: Interpolant automaton has 17 states [2018-06-18 13:31:44,399 INFO ]: Constructing interpolant automaton starting with 17 interpolants. [2018-06-18 13:31:44,399 INFO ]: CoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2018-06-18 13:31:44,399 INFO ]: Start difference. First operand 19 states and 20 transitions. Second operand 17 states. [2018-06-18 13:31:47,799 WARN ]: Spent 2.82 s on a formula simplification. DAG size of input: 77 DAG size of output: 69 [2018-06-18 13:31:48,133 WARN ]: Spent 296.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 22 [2018-06-18 13:31:48,343 WARN ]: Spent 165.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 25 [2018-06-18 13:31:48,689 WARN ]: Spent 321.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 38 [2018-06-18 13:31:49,250 WARN ]: Spent 537.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 53 [2018-06-18 13:31:49,276 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:31:49,276 INFO ]: Finished difference Result 21 states and 22 transitions. [2018-06-18 13:31:49,281 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-06-18 13:31:49,281 INFO ]: Start accepts. Automaton has 17 states. Word has length 25 [2018-06-18 13:31:49,281 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:31:49,282 INFO ]: With dead ends: 21 [2018-06-18 13:31:49,282 INFO ]: Without dead ends: 21 [2018-06-18 13:31:49,282 INFO ]: 0 DeclaredPredicates, 42 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=110, Invalid=396, Unknown=0, NotChecked=0, Total=506 [2018-06-18 13:31:49,283 INFO ]: Start minimizeSevpa. Operand 21 states. [2018-06-18 13:31:49,285 INFO ]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-06-18 13:31:49,285 INFO ]: Start removeUnreachable. Operand 21 states. [2018-06-18 13:31:49,286 INFO ]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-06-18 13:31:49,286 INFO ]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 25 [2018-06-18 13:31:49,286 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:31:49,286 INFO ]: Abstraction has 21 states and 22 transitions. [2018-06-18 13:31:49,286 INFO ]: Interpolant automaton has 17 states. [2018-06-18 13:31:49,286 INFO ]: Start isEmpty. Operand 21 states and 22 transitions. [2018-06-18 13:31:49,287 INFO ]: Finished isEmpty. Found accepting run of length 30 [2018-06-18 13:31:49,287 INFO ]: Found error trace [2018-06-18 13:31:49,287 INFO ]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:31:49,287 INFO ]: === Iteration 6 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:31:49,287 INFO ]: Analyzing trace with hash 853117551, now seen corresponding path program 5 times [2018-06-18 13:31:49,287 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:31:49,287 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:31:49,288 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:31:49,288 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:31:49,288 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:31:49,365 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:31:49,366 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:31:50,581 WARN ]: Spent 933.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2018-06-18 13:31:50,873 INFO ]: Checked inductivity of 55 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-06-18 13:31:50,874 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:31:50,874 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/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 [2018-06-18 13:31:50,880 INFO ]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-06-18 13:31:50,923 INFO ]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-06-18 13:31:50,924 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:31:50,929 INFO ]: Computing forward predicates... [2018-06-18 13:31:51,150 WARN ]: Spent 101.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 21 [2018-06-18 13:31:51,420 WARN ]: Spent 220.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 30 [2018-06-18 13:31:51,693 WARN ]: Spent 175.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 30 [2018-06-18 13:31:51,943 INFO ]: Checked inductivity of 55 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-06-18 13:31:51,963 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:31:51,963 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 20 [2018-06-18 13:31:51,964 INFO ]: Interpolant automaton has 20 states [2018-06-18 13:31:51,964 INFO ]: Constructing interpolant automaton starting with 20 interpolants. [2018-06-18 13:31:51,964 INFO ]: CoverageRelationStatistics Valid=67, Invalid=313, Unknown=0, NotChecked=0, Total=380 [2018-06-18 13:31:51,964 INFO ]: Start difference. First operand 21 states and 22 transitions. Second operand 20 states. [2018-06-18 13:31:52,403 WARN ]: Spent 405.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 44 [2018-06-18 13:31:52,556 WARN ]: Spent 121.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 20 [2018-06-18 13:31:52,753 WARN ]: Spent 179.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 24 [2018-06-18 13:31:53,007 WARN ]: Spent 227.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 39 [2018-06-18 13:31:53,174 WARN ]: Spent 146.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 33 [2018-06-18 13:31:53,521 WARN ]: Spent 316.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 38 [2018-06-18 13:31:53,552 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:31:53,552 INFO ]: Finished difference Result 23 states and 24 transitions. [2018-06-18 13:31:53,553 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-06-18 13:31:53,553 INFO ]: Start accepts. Automaton has 20 states. Word has length 29 [2018-06-18 13:31:53,553 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:31:53,553 INFO ]: With dead ends: 23 [2018-06-18 13:31:53,554 INFO ]: Without dead ends: 23 [2018-06-18 13:31:53,554 INFO ]: 0 DeclaredPredicates, 48 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=149, Invalid=501, Unknown=0, NotChecked=0, Total=650 [2018-06-18 13:31:53,555 INFO ]: Start minimizeSevpa. Operand 23 states. [2018-06-18 13:31:53,558 INFO ]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-06-18 13:31:53,558 INFO ]: Start removeUnreachable. Operand 23 states. [2018-06-18 13:31:53,559 INFO ]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-06-18 13:31:53,559 INFO ]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 29 [2018-06-18 13:31:53,559 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:31:53,559 INFO ]: Abstraction has 23 states and 24 transitions. [2018-06-18 13:31:53,559 INFO ]: Interpolant automaton has 20 states. [2018-06-18 13:31:53,559 INFO ]: Start isEmpty. Operand 23 states and 24 transitions. [2018-06-18 13:31:53,560 INFO ]: Finished isEmpty. Found accepting run of length 34 [2018-06-18 13:31:53,560 INFO ]: Found error trace [2018-06-18 13:31:53,560 INFO ]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:31:53,560 INFO ]: === Iteration 7 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:31:53,561 INFO ]: Analyzing trace with hash -1661294575, now seen corresponding path program 6 times [2018-06-18 13:31:53,561 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:31:53,561 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:31:53,561 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:31:53,561 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:31:53,561 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:31:53,644 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:31:53,645 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:31:54,135 WARN ]: Spent 148.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 41 [2018-06-18 13:31:54,457 INFO ]: Checked inductivity of 78 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-06-18 13:31:54,457 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:31:54,457 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/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 [2018-06-18 13:31:54,463 INFO ]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-06-18 13:31:54,555 INFO ]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-06-18 13:31:54,555 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:31:54,560 INFO ]: Computing forward predicates... [2018-06-18 13:31:55,282 WARN ]: Spent 428.00 ms on a formula simplification. DAG size of input: 135 DAG size of output: 26 [2018-06-18 13:31:55,645 WARN ]: Spent 175.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 32 [2018-06-18 13:31:55,891 WARN ]: Spent 203.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 30 [2018-06-18 13:31:56,188 WARN ]: Spent 247.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 28 [2018-06-18 13:31:57,037 INFO ]: Checked inductivity of 78 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-06-18 13:31:57,067 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:31:57,067 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 24 [2018-06-18 13:31:57,068 INFO ]: Interpolant automaton has 24 states [2018-06-18 13:31:57,068 INFO ]: Constructing interpolant automaton starting with 24 interpolants. [2018-06-18 13:31:57,068 INFO ]: CoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2018-06-18 13:31:57,068 INFO ]: Start difference. First operand 23 states and 24 transitions. Second operand 24 states. [2018-06-18 13:31:57,781 WARN ]: Spent 546.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 80 [2018-06-18 13:31:57,999 WARN ]: Spent 168.00 ms on a formula simplification. DAG size of input: 106 DAG size of output: 26 [2018-06-18 13:31:58,238 WARN ]: Spent 199.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 36 [2018-06-18 13:31:58,576 WARN ]: Spent 293.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 48 [2018-06-18 13:31:58,951 WARN ]: Spent 344.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 55 [2018-06-18 13:31:59,415 WARN ]: Spent 416.00 ms on a formula simplification. DAG size of input: 110 DAG size of output: 49 [2018-06-18 13:31:59,956 WARN ]: Spent 501.00 ms on a formula simplification. DAG size of input: 109 DAG size of output: 76 [2018-06-18 13:31:59,990 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:31:59,990 INFO ]: Finished difference Result 25 states and 26 transitions. [2018-06-18 13:31:59,991 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-06-18 13:31:59,991 INFO ]: Start accepts. Automaton has 24 states. Word has length 33 [2018-06-18 13:31:59,991 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:31:59,992 INFO ]: With dead ends: 25 [2018-06-18 13:31:59,992 INFO ]: Without dead ends: 25 [2018-06-18 13:31:59,992 INFO ]: 0 DeclaredPredicates, 55 GetRequests, 23 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=184, Invalid=746, Unknown=0, NotChecked=0, Total=930 [2018-06-18 13:31:59,992 INFO ]: Start minimizeSevpa. Operand 25 states. [2018-06-18 13:31:59,995 INFO ]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-06-18 13:31:59,996 INFO ]: Start removeUnreachable. Operand 25 states. [2018-06-18 13:31:59,998 INFO ]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2018-06-18 13:31:59,998 INFO ]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 33 [2018-06-18 13:31:59,999 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:31:59,999 INFO ]: Abstraction has 25 states and 26 transitions. [2018-06-18 13:31:59,999 INFO ]: Interpolant automaton has 24 states. [2018-06-18 13:31:59,999 INFO ]: Start isEmpty. Operand 25 states and 26 transitions. [2018-06-18 13:32:00,000 INFO ]: Finished isEmpty. Found accepting run of length 38 [2018-06-18 13:32:00,000 INFO ]: Found error trace [2018-06-18 13:32:00,000 INFO ]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:32:00,000 INFO ]: === Iteration 8 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:32:00,000 INFO ]: Analyzing trace with hash -1494134477, now seen corresponding path program 7 times [2018-06-18 13:32:00,000 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:32:00,000 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:32:00,001 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:32:00,001 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:32:00,001 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:32:00,064 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:32:00,064 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:32:00,386 WARN ]: Spent 118.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2018-06-18 13:32:00,633 WARN ]: Spent 106.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 35 [2018-06-18 13:32:00,805 WARN ]: Spent 163.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 36 [2018-06-18 13:32:01,371 INFO ]: Checked inductivity of 105 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-06-18 13:32:01,371 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:32:01,371 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/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 [2018-06-18 13:32:01,379 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:32:01,444 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:32:01,450 INFO ]: Computing forward predicates... [2018-06-18 13:32:02,298 WARN ]: Spent 576.00 ms on a formula simplification. DAG size of input: 110 DAG size of output: 47 [2018-06-18 13:32:03,828 WARN ]: Spent 1.30 s on a formula simplification. DAG size of input: 214 DAG size of output: 49 [2018-06-18 13:32:04,034 WARN ]: Spent 168.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 35 [2018-06-18 13:32:04,285 WARN ]: Spent 199.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 32 [2018-06-18 13:32:04,684 WARN ]: Spent 258.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 33 [2018-06-18 13:32:07,139 WARN ]: Spent 615.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2018-06-18 13:32:08,435 INFO ]: Checked inductivity of 105 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-06-18 13:32:08,456 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:32:08,456 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 32 [2018-06-18 13:32:08,456 INFO ]: Interpolant automaton has 32 states [2018-06-18 13:32:08,456 INFO ]: Constructing interpolant automaton starting with 32 interpolants. [2018-06-18 13:32:08,457 INFO ]: CoverageRelationStatistics Valid=94, Invalid=898, Unknown=0, NotChecked=0, Total=992 [2018-06-18 13:32:08,457 INFO ]: Start difference. First operand 25 states and 26 transitions. Second operand 32 states. [2018-06-18 13:32:09,496 WARN ]: Spent 976.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 107 [2018-06-18 13:32:10,071 WARN ]: Spent 520.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 40 [2018-06-18 13:32:11,174 WARN ]: Spent 1.03 s on a formula simplification. DAG size of input: 147 DAG size of output: 73 [2018-06-18 13:32:11,951 WARN ]: Spent 728.00 ms on a formula simplification. DAG size of input: 148 DAG size of output: 72 [2018-06-18 13:32:12,804 WARN ]: Spent 812.00 ms on a formula simplification. DAG size of input: 148 DAG size of output: 78 [2018-06-18 13:32:13,425 WARN ]: Spent 579.00 ms on a formula simplification. DAG size of input: 148 DAG size of output: 77 [2018-06-18 13:32:14,509 WARN ]: Spent 1.04 s on a formula simplification. DAG size of input: 149 DAG size of output: 77 [2018-06-18 13:32:15,522 WARN ]: Spent 956.00 ms on a formula simplification. DAG size of input: 144 DAG size of output: 107 [2018-06-18 13:32:15,571 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:32:15,571 INFO ]: Finished difference Result 27 states and 28 transitions. [2018-06-18 13:32:15,571 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-06-18 13:32:15,571 INFO ]: Start accepts. Automaton has 32 states. Word has length 37 [2018-06-18 13:32:15,572 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:32:15,572 INFO ]: With dead ends: 27 [2018-06-18 13:32:15,572 INFO ]: Without dead ends: 27 [2018-06-18 13:32:15,573 INFO ]: 0 DeclaredPredicates, 62 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=257, Invalid=1303, Unknown=0, NotChecked=0, Total=1560 [2018-06-18 13:32:15,573 INFO ]: Start minimizeSevpa. Operand 27 states. [2018-06-18 13:32:15,577 INFO ]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-06-18 13:32:15,577 INFO ]: Start removeUnreachable. Operand 27 states. [2018-06-18 13:32:15,577 INFO ]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-06-18 13:32:15,577 INFO ]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 37 [2018-06-18 13:32:15,578 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:32:15,578 INFO ]: Abstraction has 27 states and 28 transitions. [2018-06-18 13:32:15,578 INFO ]: Interpolant automaton has 32 states. [2018-06-18 13:32:15,578 INFO ]: Start isEmpty. Operand 27 states and 28 transitions. [2018-06-18 13:32:15,579 INFO ]: Finished isEmpty. Found accepting run of length 42 [2018-06-18 13:32:15,579 INFO ]: Found error trace [2018-06-18 13:32:15,579 INFO ]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:32:15,579 INFO ]: === Iteration 9 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:32:15,579 INFO ]: Analyzing trace with hash 1618126293, now seen corresponding path program 8 times [2018-06-18 13:32:15,579 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:32:15,579 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:32:15,583 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:32:15,583 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:32:15,583 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:32:15,663 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:32:15,664 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:32:16,174 WARN ]: Spent 108.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 47 [2018-06-18 13:32:16,299 WARN ]: Spent 112.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 36 [2018-06-18 13:32:16,409 WARN ]: Spent 100.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 29 [2018-06-18 13:32:16,966 INFO ]: Checked inductivity of 136 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-06-18 13:32:16,966 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:32:16,966 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/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 [2018-06-18 13:32:16,972 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-18 13:32:17,029 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-18 13:32:17,029 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:32:17,036 INFO ]: Computing forward predicates... [2018-06-18 13:32:18,313 WARN ]: Spent 1.15 s on a formula simplification. DAG size of input: 111 DAG size of output: 50 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown