java -Xss1g -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_No_Goto.epf -i /storage/chc-comp/sally-chc-benchmarks/lfht/lfht_2_mini_cleaned.lemma1.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8d74a04 [2018-06-22 12:24:08,861 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-22 12:24:08,863 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-22 12:24:08,874 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-22 12:24:08,874 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-22 12:24:08,875 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-22 12:24:08,876 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-22 12:24:08,878 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-22 12:24:08,880 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-22 12:24:08,880 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-22 12:24:08,881 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-22 12:24:08,882 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-22 12:24:08,883 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-22 12:24:08,884 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-06-22 12:24:08,885 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-22 12:24:08,885 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-22 12:24:08,887 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-22 12:24:08,889 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-22 12:24:08,890 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-22 12:24:08,891 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-22 12:24:08,893 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-22 12:24:08,895 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-22 12:24:08,895 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-22 12:24:08,895 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-22 12:24:08,896 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-22 12:24:08,897 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-22 12:24:08,898 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-22 12:24:08,899 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-22 12:24:08,900 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-22 12:24:08,900 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-22 12:24:08,901 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-22 12:24:08,901 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-22 12:24:08,902 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-22 12:24:08,902 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-22 12:24:08,903 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-22 12:24:08,903 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/chc/AutomizerCHC/AutomizerCHC_No_Goto.epf [2018-06-22 12:24:08,917 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-22 12:24:08,917 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-22 12:24:08,917 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-22 12:24:08,918 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-22 12:24:08,919 INFO L131 SettingsManager]: Preferences of ChcToBoogie differ from their defaults: [2018-06-22 12:24:08,919 INFO L133 SettingsManager]: * Use one large procedure with gotos to replace tail recursive calls=false [2018-06-22 12:24:08,919 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-22 12:24:08,920 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-22 12:24:08,920 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-22 12:24:08,920 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-22 12:24:08,920 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-22 12:24:08,921 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-22 12:24:08,921 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-22 12:24:08,921 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-22 12:24:08,921 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-22 12:24:08,922 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-22 12:24:08,922 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-22 12:24:08,922 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-22 12:24:08,922 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-22 12:24:08,924 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-22 12:24:08,924 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-22 12:24:08,962 INFO ]: Repository-Root is: /tmp [2018-06-22 12:24:08,976 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-22 12:24:08,982 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-22 12:24:08,983 INFO ]: Initializing SmtParser... [2018-06-22 12:24:08,983 INFO ]: SmtParser initialized [2018-06-22 12:24:08,984 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/sally-chc-benchmarks/lfht/lfht_2_mini_cleaned.lemma1.smt2 [2018-06-22 12:24:08,985 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 [2018-06-22 12:24:09,078 INFO ]: Executing SMT file /storage/chc-comp/sally-chc-benchmarks/lfht/lfht_2_mini_cleaned.lemma1.smt2 unknown [2018-06-22 12:24:09,415 INFO ]: Succesfully executed SMT file /storage/chc-comp/sally-chc-benchmarks/lfht/lfht_2_mini_cleaned.lemma1.smt2 [2018-06-22 12:24:09,420 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-22 12:24:09,435 INFO ]: Walking toolchain with 4 elements. [2018-06-22 12:24:09,435 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-22 12:24:09,435 INFO ]: Initializing ChcToBoogie... [2018-06-22 12:24:09,436 INFO ]: ChcToBoogie initialized [2018-06-22 12:24:09,439 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 22.06 12:24:09" (1/1) ... [2018-06-22 12:24:09,487 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 12:24:09 Unit [2018-06-22 12:24:09,487 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-22 12:24:09,488 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-22 12:24:09,488 INFO ]: Initializing Boogie Preprocessor... [2018-06-22 12:24:09,488 INFO ]: Boogie Preprocessor initialized [2018-06-22 12:24:09,517 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 12:24:09" (1/1) ... [2018-06-22 12:24:09,517 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 12:24:09" (1/1) ... [2018-06-22 12:24:09,528 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 12:24:09" (1/1) ... [2018-06-22 12:24:09,528 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 12:24:09" (1/1) ... [2018-06-22 12:24:09,551 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 12:24:09" (1/1) ... [2018-06-22 12:24:09,552 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 12:24:09" (1/1) ... [2018-06-22 12:24:09,554 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 12:24:09" (1/1) ... [2018-06-22 12:24:09,557 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-22 12:24:09,557 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-22 12:24:09,557 INFO ]: Initializing RCFGBuilder... [2018-06-22 12:24:09,557 INFO ]: RCFGBuilder initialized [2018-06-22 12:24:09,567 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 12:24:09" (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) [2018-06-22 12:24:09,581 INFO ]: Specification and implementation of procedure False given in one single declaration [2018-06-22 12:24:09,581 INFO ]: Found specification of procedure False [2018-06-22 12:24:09,581 INFO ]: Found implementation of procedure False [2018-06-22 12:24:09,581 INFO ]: Specification and implementation of procedure invariant given in one single declaration [2018-06-22 12:24:09,581 INFO ]: Found specification of procedure invariant [2018-06-22 12:24:09,581 INFO ]: Found implementation of procedure invariant [2018-06-22 12:24:09,582 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-22 12:24:09,582 INFO ]: Found specification of procedure Ultimate.START [2018-06-22 12:24:09,582 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 [2018-06-22 12:24:09,874 INFO ]: Using library mode [2018-06-22 12:24:09,875 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.06 12:24:09 BoogieIcfgContainer [2018-06-22 12:24:09,875 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-22 12:24:09,877 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-22 12:24:09,877 INFO ]: Initializing TraceAbstraction... [2018-06-22 12:24:09,879 INFO ]: TraceAbstraction initialized [2018-06-22 12:24:09,880 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 22.06 12:24:09" (1/3) ... [2018-06-22 12:24:09,881 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42e74ef0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 22.06 12:24:09, skipping insertion in model container [2018-06-22 12:24:09,881 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 12:24:09" (2/3) ... [2018-06-22 12:24:09,881 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42e74ef0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.06 12:24:09, skipping insertion in model container [2018-06-22 12:24:09,881 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.06 12:24:09" (3/3) ... [2018-06-22 12:24:09,883 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver [2018-06-22 12:24:09,891 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-22 12:24:09,899 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-22 12:24:09,940 INFO ]: Using default assertion order modulation [2018-06-22 12:24:09,941 INFO ]: Interprodecural is true [2018-06-22 12:24:09,941 INFO ]: Hoare is false [2018-06-22 12:24:09,941 INFO ]: Compute interpolants for FPandBP [2018-06-22 12:24:09,941 INFO ]: Backedges is TWOTRACK [2018-06-22 12:24:09,941 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-22 12:24:09,941 INFO ]: Difference is false [2018-06-22 12:24:09,941 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-22 12:24:09,941 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-22 12:24:09,955 INFO ]: Start isEmpty. Operand 13 states. [2018-06-22 12:24:09,966 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-22 12:24:09,966 INFO ]: Found error trace [2018-06-22 12:24:09,970 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 12:24:09,970 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 12:24:09,975 INFO ]: Analyzing trace with hash -597537630, now seen corresponding path program 1 times [2018-06-22 12:24:09,977 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 12:24:09,978 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 12:24:10,022 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 12:24:10,022 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 12:24:10,022 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 12:24:10,078 INFO ]: Conjunction of SSA is unsat [2018-06-22 12:24:10,294 WARN ]: Spent 115.00 ms on a formula simplification. DAG size of input: 12 DAG size of output: 8 [2018-06-22 12:24:10,362 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-22 12:24:10,364 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-22 12:24:10,364 INFO ]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-06-22 12:24:10,365 INFO ]: Interpolant automaton has 4 states [2018-06-22 12:24:10,375 INFO ]: Constructing interpolant automaton starting with 4 interpolants. [2018-06-22 12:24:10,375 INFO ]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-22 12:24:10,377 INFO ]: Start difference. First operand 13 states. Second operand 4 states. [2018-06-22 12:24:10,455 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 12:24:10,455 INFO ]: Finished difference Result 13 states and 14 transitions. [2018-06-22 12:24:10,457 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-06-22 12:24:10,459 INFO ]: Start accepts. Automaton has 4 states. Word has length 9 [2018-06-22 12:24:10,459 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 12:24:10,475 INFO ]: With dead ends: 13 [2018-06-22 12:24:10,475 INFO ]: Without dead ends: 13 [2018-06-22 12:24:10,477 INFO ]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-22 12:24:10,496 INFO ]: Start minimizeSevpa. Operand 13 states. [2018-06-22 12:24:10,518 INFO ]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-06-22 12:24:10,519 INFO ]: Start removeUnreachable. Operand 13 states. [2018-06-22 12:24:10,520 INFO ]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-06-22 12:24:10,521 INFO ]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 9 [2018-06-22 12:24:10,521 INFO ]: Finished accepts. word is rejected. [2018-06-22 12:24:10,521 INFO ]: Abstraction has 13 states and 14 transitions. [2018-06-22 12:24:10,521 INFO ]: Interpolant automaton has 4 states. [2018-06-22 12:24:10,521 INFO ]: Start isEmpty. Operand 13 states and 14 transitions. [2018-06-22 12:24:10,522 INFO ]: Finished isEmpty. Found accepting run of length 14 [2018-06-22 12:24:10,522 INFO ]: Found error trace [2018-06-22 12:24:10,522 INFO ]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 12:24:10,522 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 12:24:10,523 INFO ]: Analyzing trace with hash 1530833734, now seen corresponding path program 1 times [2018-06-22 12:24:10,523 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 12:24:10,523 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 12:24:10,523 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 12:24:10,523 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 12:24:10,523 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 12:24:10,643 INFO ]: Conjunction of SSA is unsat [2018-06-22 12:24:11,057 WARN ]: Spent 251.00 ms on a formula simplification. DAG size of input: 12 DAG size of output: 8 [2018-06-22 12:24:12,172 WARN ]: Spent 1.03 s on a formula simplification. DAG size of input: 105 DAG size of output: 36 [2018-06-22 12:24:12,229 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-22 12:24:12,229 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 12:24:12,229 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 [2018-06-22 12:24:12,239 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 12:24:12,293 INFO ]: Conjunction of SSA is unsat [2018-06-22 12:24:12,307 INFO ]: Computing forward predicates... [2018-06-22 12:24:28,727 WARN ]: Spent 512.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 40 [2018-06-22 12:24:28,767 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-22 12:24:28,789 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 12:24:28,789 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2018-06-22 12:24:28,789 INFO ]: Interpolant automaton has 8 states [2018-06-22 12:24:28,790 INFO ]: Constructing interpolant automaton starting with 8 interpolants. [2018-06-22 12:24:28,790 INFO ]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-06-22 12:24:28,790 INFO ]: Start difference. First operand 13 states and 14 transitions. Second operand 8 states. [2018-06-22 12:24:29,137 WARN ]: Spent 285.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 39 [2018-06-22 12:24:29,197 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 12:24:29,197 INFO ]: Finished difference Result 15 states and 16 transitions. [2018-06-22 12:24:29,198 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-22 12:24:29,198 INFO ]: Start accepts. Automaton has 8 states. Word has length 13 [2018-06-22 12:24:29,198 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 12:24:29,199 INFO ]: With dead ends: 15 [2018-06-22 12:24:29,199 INFO ]: Without dead ends: 15 [2018-06-22 12:24:29,199 INFO ]: 0 DeclaredPredicates, 19 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2018-06-22 12:24:29,199 INFO ]: Start minimizeSevpa. Operand 15 states. [2018-06-22 12:24:29,203 INFO ]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-06-22 12:24:29,203 INFO ]: Start removeUnreachable. Operand 15 states. [2018-06-22 12:24:29,203 INFO ]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-06-22 12:24:29,203 INFO ]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2018-06-22 12:24:29,204 INFO ]: Finished accepts. word is rejected. [2018-06-22 12:24:29,204 INFO ]: Abstraction has 15 states and 16 transitions. [2018-06-22 12:24:29,204 INFO ]: Interpolant automaton has 8 states. [2018-06-22 12:24:29,204 INFO ]: Start isEmpty. Operand 15 states and 16 transitions. [2018-06-22 12:24:29,204 INFO ]: Finished isEmpty. Found accepting run of length 18 [2018-06-22 12:24:29,204 INFO ]: Found error trace [2018-06-22 12:24:29,204 INFO ]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 12:24:29,205 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 12:24:29,205 INFO ]: Analyzing trace with hash -1486246934, now seen corresponding path program 2 times [2018-06-22 12:24:29,205 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 12:24:29,205 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 12:24:29,206 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 12:24:29,206 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 12:24:29,206 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 12:24:29,338 INFO ]: Conjunction of SSA is unsat [2018-06-22 12:24:29,912 WARN ]: Spent 319.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 34 [2018-06-22 12:24:30,104 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-22 12:24:30,104 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 12:24:30,104 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 [2018-06-22 12:24:30,118 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-22 12:24:30,163 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-22 12:24:30,163 INFO ]: Conjunction of SSA is unsat [2018-06-22 12:24:30,168 INFO ]: Computing forward predicates... Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown