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/bk-nat.c.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-14921ce [2018-06-25 12:47:58,774 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-25 12:47:58,777 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-25 12:47:58,790 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-25 12:47:58,791 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-25 12:47:58,791 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-25 12:47:58,793 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-25 12:47:58,794 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-25 12:47:58,796 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-25 12:47:58,796 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-25 12:47:58,799 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-25 12:47:58,799 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-25 12:47:58,800 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-25 12:47:58,801 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-06-25 12:47:58,804 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-25 12:47:58,804 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-25 12:47:58,806 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-25 12:47:58,819 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-25 12:47:58,820 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-25 12:47:58,820 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-25 12:47:58,821 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-25 12:47:58,822 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-25 12:47:58,822 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-25 12:47:58,823 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-25 12:47:58,824 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-25 12:47:58,825 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-25 12:47:58,826 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-25 12:47:58,826 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-25 12:47:58,827 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-25 12:47:58,827 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-25 12:47:58,828 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-25 12:47:58,828 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-25 12:47:58,829 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-25 12:47:58,829 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-25 12:47:58,830 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-25 12:47:58,830 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/chc/AutomizerCHC/AutomizerCHC_Goto.epf [2018-06-25 12:47:58,844 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-25 12:47:58,844 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-25 12:47:58,844 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-25 12:47:58,844 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-25 12:47:58,845 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-06-25 12:47:58,846 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-06-25 12:47:58,846 INFO L133 SettingsManager]: * Create interprocedural compositions=false [2018-06-25 12:47:58,846 INFO L133 SettingsManager]: * Use SBE=true [2018-06-25 12:47:58,846 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-25 12:47:58,846 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-25 12:47:58,847 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-25 12:47:58,847 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-25 12:47:58,847 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-25 12:47:58,847 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-25 12:47:58,847 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-25 12:47:58,848 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-25 12:47:58,848 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-25 12:47:58,848 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-25 12:47:58,848 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-25 12:47:58,848 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-25 12:47:58,848 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-25 12:47:58,851 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-25 12:47:58,851 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-25 12:47:58,895 INFO ]: Repository-Root is: /tmp [2018-06-25 12:47:58,910 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-25 12:47:58,914 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-25 12:47:58,915 INFO ]: Initializing SmtParser... [2018-06-25 12:47:58,915 INFO ]: SmtParser initialized [2018-06-25 12:47:58,916 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/ctigar/bk-nat.c.smt2 [2018-06-25 12:47:58,917 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 12:47:59,009 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/bk-nat.c.smt2 unknown [2018-06-25 12:47:59,406 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/bk-nat.c.smt2 [2018-06-25 12:47:59,411 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-25 12:47:59,418 INFO ]: Walking toolchain with 4 elements. [2018-06-25 12:47:59,418 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-25 12:47:59,418 INFO ]: Initializing ChcToBoogie... [2018-06-25 12:47:59,418 INFO ]: ChcToBoogie initialized [2018-06-25 12:47:59,422 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 25.06 12:47:59" (1/1) ... [2018-06-25 12:47:59,488 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 12:47:59 Unit [2018-06-25 12:47:59,488 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-25 12:47:59,489 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-25 12:47:59,489 INFO ]: Initializing Boogie Preprocessor... [2018-06-25 12:47:59,489 INFO ]: Boogie Preprocessor initialized [2018-06-25 12:47:59,514 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 12:47:59" (1/1) ... [2018-06-25 12:47:59,536 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 12:47:59" (1/1) ... [2018-06-25 12:47:59,545 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 12:47:59" (1/1) ... [2018-06-25 12:47:59,545 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 12:47:59" (1/1) ... [2018-06-25 12:47:59,568 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 12:47:59" (1/1) ... [2018-06-25 12:47:59,570 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 12:47:59" (1/1) ... [2018-06-25 12:47:59,572 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 12:47:59" (1/1) ... [2018-06-25 12:47:59,575 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-25 12:47:59,575 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-25 12:47:59,575 INFO ]: Initializing RCFGBuilder... [2018-06-25 12:47:59,575 INFO ]: RCFGBuilder initialized [2018-06-25 12:47:59,583 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 12:47:59" (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 [2018-06-25 12:47:59,600 INFO ]: Specification and implementation of procedure gotoProc given in one single declaration [2018-06-25 12:47:59,600 INFO ]: Found specification of procedure gotoProc [2018-06-25 12:47:59,600 INFO ]: Found implementation of procedure gotoProc [2018-06-25 12:47:59,600 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-25 12:47:59,600 INFO ]: Found specification of procedure Ultimate.START [2018-06-25 12:47:59,600 INFO ]: Found implementation of procedure Ultimate.START [2018-06-25 12:47:59,873 INFO ]: Using library mode [2018-06-25 12:47:59,873 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.06 12:47:59 BoogieIcfgContainer [2018-06-25 12:47:59,873 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-25 12:47:59,875 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-25 12:47:59,875 INFO ]: Initializing TraceAbstraction... [2018-06-25 12:47:59,878 INFO ]: TraceAbstraction initialized [2018-06-25 12:47:59,878 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 25.06 12:47:59" (1/3) ... [2018-06-25 12:47:59,879 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@823cbf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 25.06 12:47:59, skipping insertion in model container [2018-06-25 12:47:59,879 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 12:47:59" (2/3) ... [2018-06-25 12:47:59,879 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@823cbf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.06 12:47:59, skipping insertion in model container [2018-06-25 12:47:59,880 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.06 12:47:59" (3/3) ... [2018-06-25 12:47:59,881 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver [2018-06-25 12:47:59,899 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-25 12:47:59,921 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-25 12:47:59,966 INFO ]: Using default assertion order modulation [2018-06-25 12:47:59,967 INFO ]: Interprodecural is true [2018-06-25 12:47:59,967 INFO ]: Hoare is false [2018-06-25 12:47:59,967 INFO ]: Compute interpolants for FPandBP [2018-06-25 12:47:59,967 INFO ]: Backedges is TWOTRACK [2018-06-25 12:47:59,967 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-25 12:47:59,967 INFO ]: Difference is false [2018-06-25 12:47:59,967 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-25 12:47:59,968 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-25 12:47:59,980 INFO ]: Start isEmpty. Operand 10 states. [2018-06-25 12:47:59,992 INFO ]: Finished isEmpty. Found accepting run of length 8 [2018-06-25 12:47:59,992 INFO ]: Found error trace [2018-06-25 12:47:59,993 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-06-25 12:47:59,993 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 12:47:59,999 INFO ]: Analyzing trace with hash 1284994894, now seen corresponding path program 1 times [2018-06-25 12:48:00,002 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 12:48:00,002 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 12:48:00,035 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 12:48:00,038 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 12:48:00,038 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 12:48:00,088 INFO ]: Conjunction of SSA is unsat [2018-06-25 12:48:00,207 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 12:48:00,209 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-25 12:48:00,245 INFO ]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-06-25 12:48:00,246 INFO ]: Interpolant automaton has 3 states [2018-06-25 12:48:00,257 INFO ]: Constructing interpolant automaton starting with 3 interpolants. [2018-06-25 12:48:00,258 INFO ]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-06-25 12:48:00,261 INFO ]: Start difference. First operand 10 states. Second operand 3 states. [2018-06-25 12:48:00,329 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 12:48:00,329 INFO ]: Finished difference Result 9 states and 9 transitions. [2018-06-25 12:48:00,329 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-06-25 12:48:00,330 INFO ]: Start accepts. Automaton has 3 states. Word has length 7 [2018-06-25 12:48:00,331 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 12:48:00,339 INFO ]: With dead ends: 9 [2018-06-25 12:48:00,339 INFO ]: Without dead ends: 9 [2018-06-25 12:48:00,341 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 12:48:00,361 INFO ]: Start minimizeSevpa. Operand 9 states. [2018-06-25 12:48:00,384 INFO ]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-06-25 12:48:00,385 INFO ]: Start removeUnreachable. Operand 9 states. [2018-06-25 12:48:00,385 INFO ]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-06-25 12:48:00,387 INFO ]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2018-06-25 12:48:00,387 INFO ]: Finished accepts. word is rejected. [2018-06-25 12:48:00,387 INFO ]: Abstraction has 9 states and 9 transitions. [2018-06-25 12:48:00,387 INFO ]: Interpolant automaton has 3 states. [2018-06-25 12:48:00,387 INFO ]: Start isEmpty. Operand 9 states and 9 transitions. [2018-06-25 12:48:00,387 INFO ]: Finished isEmpty. Found accepting run of length 9 [2018-06-25 12:48:00,387 INFO ]: Found error trace [2018-06-25 12:48:00,387 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2018-06-25 12:48:00,388 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 12:48:00,388 INFO ]: Analyzing trace with hash 1180964567, now seen corresponding path program 1 times [2018-06-25 12:48:00,388 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 12:48:00,388 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 12:48:00,389 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 12:48:00,389 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 12:48:00,389 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 12:48:00,447 INFO ]: Conjunction of SSA is unsat [2018-06-25 12:48:00,723 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 12:48:00,724 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 12:48:00,724 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 12:48:00,733 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 12:48:00,792 INFO ]: Conjunction of SSA is unsat [2018-06-25 12:48:00,803 INFO ]: Computing forward predicates... [2018-06-25 12:48:06,748 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 12:48:06,782 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 12:48:06,782 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-06-25 12:48:06,783 INFO ]: Interpolant automaton has 4 states [2018-06-25 12:48:06,783 INFO ]: Constructing interpolant automaton starting with 4 interpolants. [2018-06-25 12:48:06,783 INFO ]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-06-25 12:48:06,783 INFO ]: Start difference. First operand 9 states and 9 transitions. Second operand 4 states. [2018-06-25 12:48:06,868 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 12:48:06,869 INFO ]: Finished difference Result 10 states and 10 transitions. [2018-06-25 12:48:06,869 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-06-25 12:48:06,869 INFO ]: Start accepts. Automaton has 4 states. Word has length 8 [2018-06-25 12:48:06,869 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 12:48:06,869 INFO ]: With dead ends: 10 [2018-06-25 12:48:06,869 INFO ]: Without dead ends: 10 [2018-06-25 12:48:06,870 INFO ]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-06-25 12:48:06,870 INFO ]: Start minimizeSevpa. Operand 10 states. [2018-06-25 12:48:06,871 INFO ]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-06-25 12:48:06,871 INFO ]: Start removeUnreachable. Operand 10 states. [2018-06-25 12:48:06,872 INFO ]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-06-25 12:48:06,872 INFO ]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 8 [2018-06-25 12:48:06,872 INFO ]: Finished accepts. word is rejected. [2018-06-25 12:48:06,872 INFO ]: Abstraction has 10 states and 10 transitions. [2018-06-25 12:48:06,872 INFO ]: Interpolant automaton has 4 states. [2018-06-25 12:48:06,872 INFO ]: Start isEmpty. Operand 10 states and 10 transitions. [2018-06-25 12:48:06,872 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-25 12:48:06,872 INFO ]: Found error trace [2018-06-25 12:48:06,872 INFO ]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2018-06-25 12:48:06,873 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 12:48:06,873 INFO ]: Analyzing trace with hash -2043975570, now seen corresponding path program 2 times [2018-06-25 12:48:06,873 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 12:48:06,873 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 12:48:06,886 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 12:48:06,886 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 12:48:06,886 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 12:48:07,011 INFO ]: Conjunction of SSA is unsat [2018-06-25 12:48:07,264 WARN ]: Spent 122.00 ms on a formula simplification. DAG size of input: 4 DAG size of output: 1 [2018-06-25 12:48:07,407 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 12:48:07,408 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 12:48:07,408 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 12:48:07,422 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-25 12:48:07,518 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-25 12:48:07,518 INFO ]: Conjunction of SSA is unsat [2018-06-25 12:48:07,523 INFO ]: Computing forward predicates... [2018-06-25 12:48:09,768 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 12:48:09,789 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 12:48:09,789 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2018-06-25 12:48:09,790 INFO ]: Interpolant automaton has 6 states [2018-06-25 12:48:09,790 INFO ]: Constructing interpolant automaton starting with 6 interpolants. [2018-06-25 12:48:09,790 INFO ]: CoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2018-06-25 12:48:09,790 INFO ]: Start difference. First operand 10 states and 10 transitions. Second operand 6 states. [2018-06-25 12:48:09,849 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 12:48:09,849 INFO ]: Finished difference Result 11 states and 11 transitions. [2018-06-25 12:48:09,849 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-25 12:48:09,850 INFO ]: Start accepts. Automaton has 6 states. Word has length 9 [2018-06-25 12:48:09,850 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 12:48:09,850 INFO ]: With dead ends: 11 [2018-06-25 12:48:09,850 INFO ]: Without dead ends: 11 [2018-06-25 12:48:09,850 INFO ]: 0 DeclaredPredicates, 14 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2018-06-25 12:48:09,850 INFO ]: Start minimizeSevpa. Operand 11 states. [2018-06-25 12:48:09,851 INFO ]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-06-25 12:48:09,852 INFO ]: Start removeUnreachable. Operand 11 states. [2018-06-25 12:48:09,852 INFO ]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-06-25 12:48:09,853 INFO ]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2018-06-25 12:48:09,853 INFO ]: Finished accepts. word is rejected. [2018-06-25 12:48:09,853 INFO ]: Abstraction has 11 states and 11 transitions. [2018-06-25 12:48:09,853 INFO ]: Interpolant automaton has 6 states. [2018-06-25 12:48:09,853 INFO ]: Start isEmpty. Operand 11 states and 11 transitions. [2018-06-25 12:48:09,853 INFO ]: Finished isEmpty. Found accepting run of length 11 [2018-06-25 12:48:09,853 INFO ]: Found error trace [2018-06-25 12:48:09,853 INFO ]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1] [2018-06-25 12:48:09,853 INFO ]: === Iteration 4 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 12:48:09,853 INFO ]: Analyzing trace with hash 1062095287, now seen corresponding path program 3 times [2018-06-25 12:48:09,853 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 12:48:09,853 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 12:48:09,854 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 12:48:09,854 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-25 12:48:09,854 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 12:48:09,911 INFO ]: Conjunction of SSA is unsat [2018-06-25 12:48:10,369 WARN ]: Spent 346.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 11 [2018-06-25 12:48:10,696 WARN ]: Spent 321.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 8 [2018-06-25 12:48:10,706 INFO ]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 12:48:10,706 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 12:48:10,706 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 12:48:10,727 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-25 12:48:10,828 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-06-25 12:48:10,828 INFO ]: Conjunction of SSA is unsat [2018-06-25 12:48:10,833 INFO ]: Computing forward predicates... [2018-06-25 12:48:12,793 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,820 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,823 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,833 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,837 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,841 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,844 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,848 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,881 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,884 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,889 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,896 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,921 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,928 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,930 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,939 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,954 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,971 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,973 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,976 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,981 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,989 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:12,994 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,006 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,009 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,028 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,047 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,057 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,063 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,075 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,099 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,107 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,134 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,138 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,151 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,171 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,182 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,185 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,200 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,203 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,208 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,210 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,216 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,223 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,237 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,242 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,246 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,248 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,267 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,269 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,278 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,280 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,282 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 12:48:13,285 WARN ]: expecting exponential blowup for input size 6 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown