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/lustre/metros_2.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-55b8104 [2018-06-18 16:09:45,338 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-18 16:09:45,340 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-18 16:09:45,352 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-18 16:09:45,352 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-18 16:09:45,353 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-18 16:09:45,354 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-18 16:09:45,356 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-18 16:09:45,357 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-18 16:09:45,358 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-18 16:09:45,359 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-18 16:09:45,359 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-18 16:09:45,360 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-18 16:09:45,361 INFO L177 SettingsManager]: ChcToBoogie provides no preferences, ignoring... [2018-06-18 16:09:45,362 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-18 16:09:45,367 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-18 16:09:45,369 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-18 16:09:45,380 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-18 16:09:45,382 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-18 16:09:45,383 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-18 16:09:45,384 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-18 16:09:45,386 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-18 16:09:45,387 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-18 16:09:45,387 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-18 16:09:45,388 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-18 16:09:45,396 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-18 16:09:45,397 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-18 16:09:45,398 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-18 16:09:45,399 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-18 16:09:45,399 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-18 16:09:45,400 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-18 16:09:45,400 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-18 16:09:45,401 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-18 16:09:45,402 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-18 16:09:45,402 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-18 16:09:45,402 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/chccomp2018/chcToBoogie_automizer.epf [2018-06-18 16:09:45,427 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-18 16:09:45,428 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-18 16:09:45,428 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-18 16:09:45,428 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-18 16:09:45,430 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-18 16:09:45,430 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-18 16:09:45,430 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-18 16:09:45,430 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-18 16:09:45,430 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-18 16:09:45,431 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-18 16:09:45,431 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-18 16:09:45,431 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-18 16:09:45,431 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-18 16:09:45,431 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-18 16:09:45,432 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-18 16:09:45,432 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-18 16:09:45,432 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-18 16:09:45,434 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-18 16:09:45,435 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-18 16:09:45,491 INFO ]: Repository-Root is: /tmp [2018-06-18 16:09:45,508 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-18 16:09:45,512 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-18 16:09:45,514 INFO ]: Initializing SmtParser... [2018-06-18 16:09:45,514 INFO ]: SmtParser initialized [2018-06-18 16:09:45,515 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/lustre/metros_2.smt2 [2018-06-18 16:09:45,516 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 16:09:45,602 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/lustre/metros_2.smt2 unknown [2018-06-18 16:09:46,082 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/lustre/metros_2.smt2 [2018-06-18 16:09:46,086 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-18 16:09:46,101 INFO ]: Walking toolchain with 4 elements. [2018-06-18 16:09:46,101 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-18 16:09:46,101 INFO ]: Initializing ChcToBoogie... [2018-06-18 16:09:46,102 INFO ]: ChcToBoogie initialized [2018-06-18 16:09:46,118 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 18.06 04:09:46" (1/1) ... [2018-06-18 16:09:46,241 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:09:46 Unit [2018-06-18 16:09:46,241 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-18 16:09:46,242 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-18 16:09:46,242 INFO ]: Initializing Boogie Preprocessor... [2018-06-18 16:09:46,242 INFO ]: Boogie Preprocessor initialized [2018-06-18 16:09:46,263 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:09:46" (1/1) ... [2018-06-18 16:09:46,263 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:09:46" (1/1) ... [2018-06-18 16:09:46,282 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:09:46" (1/1) ... [2018-06-18 16:09:46,282 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:09:46" (1/1) ... [2018-06-18 16:09:46,293 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:09:46" (1/1) ... [2018-06-18 16:09:46,294 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:09:46" (1/1) ... [2018-06-18 16:09:46,296 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:09:46" (1/1) ... [2018-06-18 16:09:46,307 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-18 16:09:46,308 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-18 16:09:46,308 INFO ]: Initializing RCFGBuilder... [2018-06-18 16:09:46,308 INFO ]: RCFGBuilder initialized [2018-06-18 16:09:46,309 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:09:46" (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 16:09:46,330 INFO ]: Specification and implementation of procedure False given in one single declaration [2018-06-18 16:09:46,331 INFO ]: Found specification of procedure False [2018-06-18 16:09:46,331 INFO ]: Found implementation of procedure False [2018-06-18 16:09:46,331 INFO ]: Specification and implementation of procedure state given in one single declaration [2018-06-18 16:09:46,331 INFO ]: Found specification of procedure state [2018-06-18 16:09:46,331 INFO ]: Found implementation of procedure state [2018-06-18 16:09:46,331 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-18 16:09:46,331 INFO ]: Found specification of procedure Ultimate.START [2018-06-18 16:09:46,331 INFO ]: Found implementation of procedure Ultimate.START [2018-06-18 16:09:46,638 INFO ]: Using library mode [2018-06-18 16:09:46,639 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.06 04:09:46 BoogieIcfgContainer [2018-06-18 16:09:46,639 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-18 16:09:46,641 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-18 16:09:46,641 INFO ]: Initializing TraceAbstraction... [2018-06-18 16:09:46,644 INFO ]: TraceAbstraction initialized [2018-06-18 16:09:46,644 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 18.06 04:09:46" (1/3) ... [2018-06-18 16:09:46,645 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4801cbde and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 18.06 04:09:46, skipping insertion in model container [2018-06-18 16:09:46,645 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:09:46" (2/3) ... [2018-06-18 16:09:46,645 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4801cbde and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.06 04:09:46, skipping insertion in model container [2018-06-18 16:09:46,645 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.06 04:09:46" (3/3) ... [2018-06-18 16:09:46,649 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver [2018-06-18 16:09:46,658 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-18 16:09:46,669 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-18 16:09:46,716 INFO ]: Using default assertion order modulation [2018-06-18 16:09:46,717 INFO ]: Interprodecural is true [2018-06-18 16:09:46,717 INFO ]: Hoare is false [2018-06-18 16:09:46,717 INFO ]: Compute interpolants for FPandBP [2018-06-18 16:09:46,717 INFO ]: Backedges is TWOTRACK [2018-06-18 16:09:46,717 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-18 16:09:46,717 INFO ]: Difference is false [2018-06-18 16:09:46,717 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-18 16:09:46,717 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-18 16:09:46,731 INFO ]: Start isEmpty. Operand 13 states. [2018-06-18 16:09:46,747 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-18 16:09:46,748 INFO ]: Found error trace [2018-06-18 16:09:46,749 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:09:46,749 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:09:46,755 INFO ]: Analyzing trace with hash -597537630, now seen corresponding path program 1 times [2018-06-18 16:09:46,757 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:09:46,757 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:09:46,794 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:09:46,794 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 16:09:46,794 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:09:46,895 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:09:46,903 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 16:09:47,062 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-18 16:09:47,068 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-18 16:09:47,068 INFO ]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-06-18 16:09:47,070 INFO ]: Interpolant automaton has 4 states [2018-06-18 16:09:47,087 INFO ]: Constructing interpolant automaton starting with 4 interpolants. [2018-06-18 16:09:47,087 INFO ]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-18 16:09:47,090 INFO ]: Start difference. First operand 13 states. Second operand 4 states. [2018-06-18 16:09:47,225 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 16:09:47,225 INFO ]: Finished difference Result 13 states and 14 transitions. [2018-06-18 16:09:47,226 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-06-18 16:09:47,227 INFO ]: Start accepts. Automaton has 4 states. Word has length 9 [2018-06-18 16:09:47,227 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 16:09:47,237 INFO ]: With dead ends: 13 [2018-06-18 16:09:47,237 INFO ]: Without dead ends: 13 [2018-06-18 16:09:47,239 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 16:09:47,253 INFO ]: Start minimizeSevpa. Operand 13 states. [2018-06-18 16:09:47,278 INFO ]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-06-18 16:09:47,279 INFO ]: Start removeUnreachable. Operand 13 states. [2018-06-18 16:09:47,280 INFO ]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-06-18 16:09:47,281 INFO ]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 9 [2018-06-18 16:09:47,281 INFO ]: Finished accepts. word is rejected. [2018-06-18 16:09:47,281 INFO ]: Abstraction has 13 states and 14 transitions. [2018-06-18 16:09:47,281 INFO ]: Interpolant automaton has 4 states. [2018-06-18 16:09:47,281 INFO ]: Start isEmpty. Operand 13 states and 14 transitions. [2018-06-18 16:09:47,285 INFO ]: Finished isEmpty. Found accepting run of length 14 [2018-06-18 16:09:47,285 INFO ]: Found error trace [2018-06-18 16:09:47,285 INFO ]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:09:47,285 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:09:47,285 INFO ]: Analyzing trace with hash 1530833734, now seen corresponding path program 1 times [2018-06-18 16:09:47,286 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:09:47,286 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:09:47,286 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:09:47,286 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 16:09:47,286 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:09:47,405 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:09:47,406 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 16:09:47,936 WARN ]: Spent 366.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2018-06-18 16:09:47,990 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-18 16:09:47,991 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 16:09:47,991 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 16:09:47,997 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 16:09:48,120 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:09:48,131 INFO ]: Computing forward predicates... [2018-06-18 16:09:48,778 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-18 16:09:48,813 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 16:09:48,813 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2018-06-18 16:09:48,814 INFO ]: Interpolant automaton has 8 states [2018-06-18 16:09:48,814 INFO ]: Constructing interpolant automaton starting with 8 interpolants. [2018-06-18 16:09:48,814 INFO ]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2018-06-18 16:09:48,814 INFO ]: Start difference. First operand 13 states and 14 transitions. Second operand 8 states. [2018-06-18 16:09:49,283 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 16:09:49,283 INFO ]: Finished difference Result 15 states and 16 transitions. [2018-06-18 16:09:49,284 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-18 16:09:49,284 INFO ]: Start accepts. Automaton has 8 states. Word has length 13 [2018-06-18 16:09:49,284 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 16:09:49,285 INFO ]: With dead ends: 15 [2018-06-18 16:09:49,285 INFO ]: Without dead ends: 15 [2018-06-18 16:09:49,286 INFO ]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2018-06-18 16:09:49,286 INFO ]: Start minimizeSevpa. Operand 15 states. [2018-06-18 16:09:49,288 INFO ]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-06-18 16:09:49,289 INFO ]: Start removeUnreachable. Operand 15 states. [2018-06-18 16:09:49,289 INFO ]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-06-18 16:09:49,289 INFO ]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2018-06-18 16:09:49,289 INFO ]: Finished accepts. word is rejected. [2018-06-18 16:09:49,289 INFO ]: Abstraction has 15 states and 16 transitions. [2018-06-18 16:09:49,289 INFO ]: Interpolant automaton has 8 states. [2018-06-18 16:09:49,289 INFO ]: Start isEmpty. Operand 15 states and 16 transitions. [2018-06-18 16:09:49,291 INFO ]: Finished isEmpty. Found accepting run of length 18 [2018-06-18 16:09:49,291 INFO ]: Found error trace [2018-06-18 16:09:49,291 INFO ]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:09:49,291 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:09:49,291 INFO ]: Analyzing trace with hash -1486246934, now seen corresponding path program 2 times [2018-06-18 16:09:49,291 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:09:49,291 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:09:49,292 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:09:49,292 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 16:09:49,292 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:09:49,436 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:09:49,437 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 16:09:49,782 WARN ]: Spent 124.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 42 [2018-06-18 16:09:50,238 WARN ]: Spent 321.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2018-06-18 16:09:50,272 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-18 16:09:50,273 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 16:09:50,273 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 16:09:50,285 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-18 16:09:50,438 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-18 16:09:50,438 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:09:50,444 INFO ]: Computing forward predicates... [2018-06-18 16:09:50,744 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-18 16:09:50,774 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 16:09:50,774 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2018-06-18 16:09:50,775 INFO ]: Interpolant automaton has 13 states [2018-06-18 16:09:50,775 INFO ]: Constructing interpolant automaton starting with 13 interpolants. [2018-06-18 16:09:50,775 INFO ]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2018-06-18 16:09:50,775 INFO ]: Start difference. First operand 15 states and 16 transitions. Second operand 13 states. [2018-06-18 16:09:50,988 WARN ]: Spent 172.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 75 [2018-06-18 16:09:51,246 WARN ]: Spent 196.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 90 [2018-06-18 16:09:51,406 WARN ]: Spent 123.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 55 [2018-06-18 16:09:51,457 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 16:09:51,457 INFO ]: Finished difference Result 17 states and 18 transitions. [2018-06-18 16:09:51,458 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-06-18 16:09:51,458 INFO ]: Start accepts. Automaton has 13 states. Word has length 17 [2018-06-18 16:09:51,458 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 16:09:51,459 INFO ]: With dead ends: 17 [2018-06-18 16:09:51,459 INFO ]: Without dead ends: 17 [2018-06-18 16:09:51,459 INFO ]: 0 DeclaredPredicates, 28 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2018-06-18 16:09:51,459 INFO ]: Start minimizeSevpa. Operand 17 states. [2018-06-18 16:09:51,462 INFO ]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-06-18 16:09:51,462 INFO ]: Start removeUnreachable. Operand 17 states. [2018-06-18 16:09:51,463 INFO ]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-06-18 16:09:51,463 INFO ]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 17 [2018-06-18 16:09:51,463 INFO ]: Finished accepts. word is rejected. [2018-06-18 16:09:51,463 INFO ]: Abstraction has 17 states and 18 transitions. [2018-06-18 16:09:51,463 INFO ]: Interpolant automaton has 13 states. [2018-06-18 16:09:51,463 INFO ]: Start isEmpty. Operand 17 states and 18 transitions. [2018-06-18 16:09:51,464 INFO ]: Finished isEmpty. Found accepting run of length 22 [2018-06-18 16:09:51,464 INFO ]: Found error trace [2018-06-18 16:09:51,464 INFO ]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:09:51,464 INFO ]: === Iteration 4 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:09:51,464 INFO ]: Analyzing trace with hash -2056434034, now seen corresponding path program 3 times [2018-06-18 16:09:51,464 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:09:51,464 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:09:51,465 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:09:51,465 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 16:09:51,465 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:09:51,625 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:09:51,635 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 16:09:52,132 WARN ]: Spent 186.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 23 [2018-06-18 16:09:52,458 WARN ]: Spent 314.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 51 [2018-06-18 16:09:52,667 WARN ]: Spent 196.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 49 [2018-06-18 16:09:52,891 WARN ]: Spent 195.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 30 [2018-06-18 16:09:53,031 WARN ]: Spent 121.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 46 [2018-06-18 16:09:53,049 INFO ]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-18 16:09:53,049 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 16:09:53,049 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 16:09:53,057 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-18 16:09:53,246 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-06-18 16:09:53,246 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:09:53,253 INFO ]: Computing forward predicates... [2018-06-18 16:09:53,552 INFO ]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-18 16:09:53,574 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 16:09:53,574 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 17 [2018-06-18 16:09:53,574 INFO ]: Interpolant automaton has 17 states [2018-06-18 16:09:53,574 INFO ]: Constructing interpolant automaton starting with 17 interpolants. [2018-06-18 16:09:53,575 INFO ]: CoverageRelationStatistics Valid=39, Invalid=233, Unknown=0, NotChecked=0, Total=272 [2018-06-18 16:09:53,575 INFO ]: Start difference. First operand 17 states and 18 transitions. Second operand 17 states. [2018-06-18 16:09:53,846 WARN ]: Spent 205.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 93 [2018-06-18 16:09:54,202 WARN ]: Spent 230.00 ms on a formula simplification. DAG size of input: 105 DAG size of output: 88 [2018-06-18 16:09:54,548 WARN ]: Spent 272.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 96 [2018-06-18 16:09:54,881 WARN ]: Spent 297.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 81 [2018-06-18 16:09:54,937 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 16:09:54,937 INFO ]: Finished difference Result 19 states and 20 transitions. [2018-06-18 16:09:54,938 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-06-18 16:09:54,938 INFO ]: Start accepts. Automaton has 17 states. Word has length 21 [2018-06-18 16:09:54,938 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 16:09:54,939 INFO ]: With dead ends: 19 [2018-06-18 16:09:54,939 INFO ]: Without dead ends: 19 [2018-06-18 16:09:54,939 INFO ]: 0 DeclaredPredicates, 35 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=99, Invalid=363, Unknown=0, NotChecked=0, Total=462 [2018-06-18 16:09:54,940 INFO ]: Start minimizeSevpa. Operand 19 states. [2018-06-18 16:09:54,943 INFO ]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-06-18 16:09:54,943 INFO ]: Start removeUnreachable. Operand 19 states. [2018-06-18 16:09:54,943 INFO ]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-06-18 16:09:54,943 INFO ]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 21 [2018-06-18 16:09:54,943 INFO ]: Finished accepts. word is rejected. [2018-06-18 16:09:54,943 INFO ]: Abstraction has 19 states and 20 transitions. [2018-06-18 16:09:54,944 INFO ]: Interpolant automaton has 17 states. [2018-06-18 16:09:54,944 INFO ]: Start isEmpty. Operand 19 states and 20 transitions. [2018-06-18 16:09:54,944 INFO ]: Finished isEmpty. Found accepting run of length 26 [2018-06-18 16:09:54,944 INFO ]: Found error trace [2018-06-18 16:09:54,944 INFO ]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:09:54,944 INFO ]: === Iteration 5 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:09:54,945 INFO ]: Analyzing trace with hash -434924750, now seen corresponding path program 4 times [2018-06-18 16:09:54,945 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:09:54,945 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:09:54,945 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:09:54,945 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 16:09:54,945 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:09:55,168 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:09:55,169 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 16:09:55,870 WARN ]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2018-06-18 16:09:56,595 WARN ]: Spent 700.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 69 [2018-06-18 16:09:57,328 WARN ]: Spent 703.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 66 [2018-06-18 16:09:57,958 WARN ]: Spent 596.00 ms on a formula simplification. DAG size of input: 168 DAG size of output: 80 [2018-06-18 16:09:58,343 WARN ]: Spent 325.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 48 [2018-06-18 16:09:59,439 WARN ]: Spent 983.00 ms on a formula simplification. DAG size of input: 166 DAG size of output: 35 [2018-06-18 16:09:59,606 WARN ]: Spent 118.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 50 [2018-06-18 16:09:59,674 INFO ]: Checked inductivity of 36 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-06-18 16:09:59,674 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 16:09:59,701 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 16:09:59,707 INFO ]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-06-18 16:09:59,884 INFO ]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-06-18 16:09:59,884 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:09:59,892 INFO ]: Computing forward predicates... [2018-06-18 16:10:00,628 WARN ]: Spent 117.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 34 [2018-06-18 16:10:00,945 INFO ]: Checked inductivity of 36 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-06-18 16:10:00,967 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 16:10:00,967 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 21 [2018-06-18 16:10:00,967 INFO ]: Interpolant automaton has 21 states [2018-06-18 16:10:00,967 INFO ]: Constructing interpolant automaton starting with 21 interpolants. [2018-06-18 16:10:00,967 INFO ]: CoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2018-06-18 16:10:00,968 INFO ]: Start difference. First operand 19 states and 20 transitions. Second operand 21 states. [2018-06-18 16:10:01,870 WARN ]: Spent 837.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 148 [2018-06-18 16:10:03,180 WARN ]: Spent 1.20 s on a formula simplification. DAG size of input: 252 DAG size of output: 162 [2018-06-18 16:10:04,460 WARN ]: Spent 1.21 s on a formula simplification. DAG size of input: 244 DAG size of output: 165 [2018-06-18 16:10:06,050 WARN ]: Spent 1.52 s on a formula simplification. DAG size of input: 235 DAG size of output: 194 [2018-06-18 16:10:06,922 WARN ]: Spent 752.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 130 [2018-06-18 16:10:06,994 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 16:10:06,994 INFO ]: Finished difference Result 21 states and 22 transitions. [2018-06-18 16:10:06,997 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-06-18 16:10:06,997 INFO ]: Start accepts. Automaton has 21 states. Word has length 25 [2018-06-18 16:10:06,997 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 16:10:06,998 INFO ]: With dead ends: 21 [2018-06-18 16:10:06,998 INFO ]: Without dead ends: 21 [2018-06-18 16:10:06,998 INFO ]: 0 DeclaredPredicates, 42 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2018-06-18 16:10:06,998 INFO ]: Start minimizeSevpa. Operand 21 states. [2018-06-18 16:10:07,002 INFO ]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-06-18 16:10:07,002 INFO ]: Start removeUnreachable. Operand 21 states. [2018-06-18 16:10:07,003 INFO ]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-06-18 16:10:07,003 INFO ]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 25 [2018-06-18 16:10:07,003 INFO ]: Finished accepts. word is rejected. [2018-06-18 16:10:07,003 INFO ]: Abstraction has 21 states and 22 transitions. [2018-06-18 16:10:07,003 INFO ]: Interpolant automaton has 21 states. [2018-06-18 16:10:07,003 INFO ]: Start isEmpty. Operand 21 states and 22 transitions. [2018-06-18 16:10:07,004 INFO ]: Finished isEmpty. Found accepting run of length 30 [2018-06-18 16:10:07,004 INFO ]: Found error trace [2018-06-18 16:10:07,004 INFO ]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:10:07,004 INFO ]: === Iteration 6 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:10:07,004 INFO ]: Analyzing trace with hash 1986427350, now seen corresponding path program 5 times [2018-06-18 16:10:07,004 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:10:07,004 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:10:07,005 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:10:07,005 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 16:10:07,005 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:10:07,280 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:10:07,285 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 16:10:10,898 WARN ]: Spent 665.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 23 [2018-06-18 16:10:11,303 WARN ]: Spent 313.00 ms on a formula simplification. DAG size of input: 187 DAG size of output: 47 [2018-06-18 16:10:11,963 WARN ]: Spent 604.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 77 [2018-06-18 16:10:12,986 WARN ]: Spent 806.00 ms on a formula simplification. DAG size of input: 266 DAG size of output: 62 [2018-06-18 16:10:13,216 WARN ]: Spent 205.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 40 [2018-06-18 16:10:13,839 WARN ]: Spent 380.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 27 [2018-06-18 16:10:14,743 WARN ]: Spent 772.00 ms on a formula simplification. DAG size of input: 352 DAG size of output: 50 [2018-06-18 16:10:15,762 WARN ]: Spent 896.00 ms on a formula simplification. DAG size of input: 366 DAG size of output: 57 [2018-06-18 16:10:16,272 WARN ]: Spent 371.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 24 [2018-06-18 16:10:16,294 INFO ]: Checked inductivity of 55 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-06-18 16:10:16,295 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 16:10:16,295 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 16:10:16,300 INFO ]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-06-18 16:10:16,535 INFO ]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-06-18 16:10:16,535 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:10:16,545 INFO ]: Computing forward predicates... [2018-06-18 16:10:18,019 WARN ]: Spent 149.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 27 [2018-06-18 16:10:18,530 WARN ]: Spent 200.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 35 [2018-06-18 16:10:18,740 INFO ]: Checked inductivity of 55 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2018-06-18 16:10:18,762 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 16:10:18,763 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 23 [2018-06-18 16:10:18,763 INFO ]: Interpolant automaton has 23 states [2018-06-18 16:10:18,763 INFO ]: Constructing interpolant automaton starting with 23 interpolants. [2018-06-18 16:10:18,763 INFO ]: CoverageRelationStatistics Valid=50, Invalid=456, Unknown=0, NotChecked=0, Total=506 [2018-06-18 16:10:18,763 INFO ]: Start difference. First operand 21 states and 22 transitions. Second operand 23 states. [2018-06-18 16:10:19,451 WARN ]: Spent 617.00 ms on a formula simplification. DAG size of input: 205 DAG size of output: 168 [2018-06-18 16:10:19,615 WARN ]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2018-06-18 16:10:21,139 WARN ]: Spent 1.42 s on a formula simplification. DAG size of input: 317 DAG size of output: 214 [2018-06-18 16:10:22,742 WARN ]: Spent 1.54 s on a formula simplification. DAG size of input: 314 DAG size of output: 227 [2018-06-18 16:10:23,962 WARN ]: Spent 1.08 s on a formula simplification. DAG size of input: 275 DAG size of output: 220 [2018-06-18 16:10:24,768 WARN ]: Spent 716.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 201 [2018-06-18 16:10:25,427 WARN ]: Spent 570.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 155 [2018-06-18 16:10:25,501 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 16:10:25,501 INFO ]: Finished difference Result 23 states and 24 transitions. [2018-06-18 16:10:25,502 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-06-18 16:10:25,502 INFO ]: Start accepts. Automaton has 23 states. Word has length 29 [2018-06-18 16:10:25,503 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 16:10:25,503 INFO ]: With dead ends: 23 [2018-06-18 16:10:25,503 INFO ]: Without dead ends: 23 [2018-06-18 16:10:25,504 INFO ]: 0 DeclaredPredicates, 49 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=171, Invalid=699, Unknown=0, NotChecked=0, Total=870 [2018-06-18 16:10:25,504 INFO ]: Start minimizeSevpa. Operand 23 states. [2018-06-18 16:10:25,507 INFO ]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-06-18 16:10:25,507 INFO ]: Start removeUnreachable. Operand 23 states. [2018-06-18 16:10:25,508 INFO ]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-06-18 16:10:25,508 INFO ]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 29 [2018-06-18 16:10:25,508 INFO ]: Finished accepts. word is rejected. [2018-06-18 16:10:25,508 INFO ]: Abstraction has 23 states and 24 transitions. [2018-06-18 16:10:25,508 INFO ]: Interpolant automaton has 23 states. [2018-06-18 16:10:25,508 INFO ]: Start isEmpty. Operand 23 states and 24 transitions. [2018-06-18 16:10:25,509 INFO ]: Finished isEmpty. Found accepting run of length 34 [2018-06-18 16:10:25,509 INFO ]: Found error trace [2018-06-18 16:10:25,509 INFO ]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:10:25,509 INFO ]: === Iteration 7 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:10:25,509 INFO ]: Analyzing trace with hash 800064122, now seen corresponding path program 6 times [2018-06-18 16:10:25,509 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:10:25,509 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:10:25,509 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:10:25,509 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 16:10:25,509 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:10:25,987 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:10:25,988 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown